JPS5815431A - AC/DC interconnection system control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device d for an AC/DC interconnection system, and particularly to a control device for an AC/DC interconnection system suitable for use in cooperative control between a weak AC system and a DC system.

FIG. 1 is a schematic single line diagram of a normal AC/DC interconnection system. In the figure, 11.21 is the generator, 12.22 is the AC transmission line, 13.23 is the thyristor converter transformer, 14°24
is a thyristor converter, 15.25 is a filter and harmonic capacity, 16.26 is an AC load, 17.27 is a DC reactor, and 18 is a DC transmission line.

Further, A is a power conversion station that converts AC power to DC power (one company conversion), and B is a power conversion station that converts DC power to AC power (inverse conversion).

Note that FIG. 2 shows a specific circuit example of the thyristor converter transformer 13 and the thyristor converter 14.

As is well known, the thyristor converter 14 also operates as a forward converter for converting power from alternating current to direct current, depending on the firing angle phase control of each thyristor, or as a rule, It also works as an inverse converter that converts direct current to alternating current.

The AC/DC interconnection system shown in FIG. 1 is operated as follows.

At power converter station A, the AC power converter and the converter transformer M3 are installed.
And the thyristor converter 149 converts it into DC power using a known method (forward conversion). The nu h 'TIE force output from the thyristor converter 14 is applied to the DC reactor 1
After the ripples in the current are smoothed by 7, the DC transmission line 1
Get sent to 8.

The power conversion 79r13 receives this DC power and converts it into an AC 151tI force using a known method using the Cyrisk converter 24, the converter 111, and the transformer 23 (inverse conversion).

As mentioned above, thyristor converters can be either forward or inverse converters by controlling the firing phase. Therefore, contrary to the above case, it is also possible to send the power converter station AK from the power converter PfrB.

In both cases of conversion from alternating current to one true current and vice versa, delayed reactive power is required, so phase adjustment equipment is provided to compensate for this.

Furthermore, since a current close to a square wave flows through the converter transformer during mutual conversion of AC (A current), a harmonic filter is provided to prevent harmonic components contained therein from flowing out into the AC system.

This harmonic filter also serves to compensate for a portion of the reactive power. Therefore, these are collectively shown in FIG. 1 as a filter and a phase adjustment capacitor of 15°25.

Incidentally, in recent years, a voltage instability phenomenon in which the load voltage cannot be maintained at a specified voltage has become a problem. The following two factors are thought to be the cause.

(1) As the demand for electricity increases year by year, it is difficult to acquire land for power plants near cities, so each power transmission line tends to have a longer distance and a larger power transmission capacity.

(2) A load voltage regulator is installed at the load end, and is adjusted so that even if the voltage at the power transmission end fluctuates, the voltage at the load end is maintained at a standard voltage value. Therefore, on a steady basis, the DC current flowing through the DC power transmission line 18 is constant, and therefore, it can be considered that a load that consumes constant power is connected.

The stability limit of such a static ITf transmission system is defined by the presence or absence of an AC voltage instability phenomenon at an AC/DC interconnection point. The stability of the AC voltage at this time is determined by the ratio of the DC power to the short-circuit capacity of the AC system (short-circuit capacity ratio), the direct fAf, the direction and magnitude of the power flow, and the voltage of the load. It is also influenced by characteristics and AC system configuration.

Next, voltage stability will be explained with reference to the model system shown in FIG. In FIG. 3, 1 is a generator, 2 is a power source end, 6 is a power transmission line, 4 is a load end, 5 is a filter and a phase adjusting capacity, 6 is an AC load, and 7 is a DC load.

Further, the symbols in each formula written in FIG. 3 are used as follows.

E; Voltage at power supply end 2 (Pi:>O) ■; Voltage at load end 4 (V>0) b; Filter and body symmetry at load end 4 -9 = ω; Angular frequency t; Time θ; Load end Phase lag of voltage Y=G+jB; Admittance P+j of transmission line 6 Q: Complex power flowing into the load at load end 4 with a negative sign p, +j Qt; Complex power consumed by AC load 6 Pd+jQd; DC Complex power consumed by system load 7 At this time, (P+jQ) is the complex power transmitted from generator 1 to AC system load 6 and DC system load 7 via power transmission line 3,
Since it is the sum of the reactive power supplied from the harmonizer with a negative sign, it is given by the formula (0).

P +j Q = Y (V2- EVejθ) -j
b V2-Song-(1) In equation (1), the 1 mark indicates a complex number, and the old mark indicates a conjugate complex number.

Substituting Y=G+ j B into the above equation (0) and dividing it into a real part and an imaginary part gives the following (2) l (3
) formula % formula % (2) Q = −EV (G JI+lθ−BDOj・θ)−
V"(B+b)...(3) In this case, the frequency is constant, so the power consumption is a function only of the voltage.

In the /C steady state, it can be considered that the frost and power expressed by the following equations (4) and (5) are consumed in the load.

P-PvIIl+P, ・・・・・・・・・(4) L, O QT+ ”= Q(1”f′+”1 . . .
(5) In this way, in the steady state, the load power consumption is given by the equation (4) + (5). Then, the load power consumption and the power supplied to it [: (2), (5
), so the following (6j
, (7) formula holds/-0P■, + l) 20
・・・・・・・・・(6)Ql, +Q
= 0 ・・・・・・・・・(7) Above 0
) to (7), the phase angle θ is eliminated. For this,
First, convert (71, equation (4) into equation (6), - and (5),
When formula (5) is substituted seven times into formula (7), formulas (8) and (9) are obtained as 10.

P Vm+P+V2G 2EV (G city θ+Bsj, n
o)・・・・・・・・・(8)Qo ”+Qa −V”
(B + b) = EV (G, rinθ−Bratθ
) ········(9) If we take the square o[1 of both expressions, (
Equation 11 is obtained, and the desired relationship between the power supply end voltage E and the load end voltage ■ can be determined by 44J.

・・・・・・・・・・・・(l[) Using this formula, with the DC power transmission power ■]6 as a parameter, υ, the voltage E at the power source end 2 and the voltage ■ at the load end 4 can be calculated. When the relationship is determined, it becomes the formula 9 shown in FIG. In this figure, the horizontal axis is the frost, the vertical axis is the load end voltage V, and the solid line indicates the stable equilibrium point, and the broken line indicates the unstable equilibrium point.

Furthermore, curve 1. When P is large, the curve L3 shows a case where P4 is medium, and the curve L3 shows a case where P4 is small.

At normal operating point A, both the power supply terminal and load terminal voltages are 1.
It is located near P and U (per unit). As the voltage E at the power supply end decreases due to the influence of load fluctuations, the voltage at the load end (■) moves along a curve, for example, from point A to point B and then to point 6.3, the voltage E at the power supply end 5φ
Decrease 1. / At this moment, the operating point reaches the stability limit point C. In this case, zero or a stable equilibrium point cannot be obtained and a voltage collapse phenomenon occurs, which is a problem in terms of power supply reliability.

As is clear from the above considerations, in each curve that ends or stops due to heavy transmission power, the stable region becomes wider as the operating point has a larger margin from the stability limit point. That is, the smaller the DC power transmission power P4 is, the more stable the system is.

Conventionally, as an intermediate stage for improving voltage stability, a non-heted type harmonizer such as a synchronous harmonizer or a static harmonizer combining a capacitor and a saturable reactor has been used.

However, these conventional devices have drawbacks such as requiring a place to install them and being economically burdensome.

In order to solve the above-mentioned disadvantages, the present invention provides a load voltage of 1'
＃￥1A system of AC/DC interconnections that can improve voltage stability either by itself or by effectively using the total power generated and load voltage information. purpose.

The present invention, as a means to solve the above-mentioned disadvantages, enables stable DC power transmission by varying the set value of DC power transmission power based on constant load voltage information or based on the total power generation power and load voltage information. It is characterized by the following points.

FIG. 5 is a block diagram showing the main configuration of an embodiment of the present invention. In A, the same reference numerals as in Figure 1 indicate the same or equivalent parts.

In FIG. 5, 60 is a voltage transformer connected to the load end 4, 32 is an upper limit comparator that compares the voltage V at the load end 4 and its upper limit value VU, and 33 is the same (the voltage V at the load end and , a lower limit comparator that compares the lower limit value vL, and 34 a power set value comparator that compares the DC power set value Pr@f and the scheduled transmission power Pd.

35 is the upper limit comparator 52. Depending on the outputs of the lower limit comparator 63 and the power comparator 64, the thyristor converter 1
4, a DC power setting device for setting the DC power setting value Pr*t; 36, a generating power setting device for setting the generated power of the generator 110; and 67, an AND gate.

14- Next, with reference to the characteristic quantity R9 in FIGS. 7 and 8, the fifth
The operation of the illustrated embodiment will be explained.

Now, it is assumed that the DC power transmission power of this system is set to a certain value and that operation is being carried out at point A1 on the curve shown in FIG. Here, when the voltage E at the power supply end decreases, the voltage V at the load end 4 shifts from point A to point B on the curve B1 as shown in Figure 8g7. Decrease.

The voltage V at the load end 4 is constantly supplied via the voltage transformer 60 to the upper and lower limit comparators 52,33. Then, when the operating point reaches B1, the voltage V at the load end 4 becomes
3, which causes the lower limit comparator 33 of FIG. 5 to produce an output. This output is fed to a DC power setter 35 to reduce the DC power set point P rat for the thyristor converter 14 .

As a result of the above-F operation, the operating point follows the curve shown in Figure 7.

Move to the upper point, and the voltage V at the load end is the lower limit (1 & V
It becomes larger than L. Furthermore, the stability limit value in this case is C
2, with more margin and greater stability compared to the initial operating condition.

When the power supply end voltage E further decreases and the operating point reaches point B2, the load end voltage V reaches its lower limit value vL.

Therefore, after passing through the same overcultation as described above, the DC power setting value P
ref is further decreased.

As a result, the operating point is the point D3 on the track @rs in Figure 7.
Jump to. Since the stability limit point in this case is C3, there is more margin and stability compared to the previous operating state. At the same time, of course, the load end voltage V increases to a value equal to or higher than its lower limit value vL.

Next, when the power supply end voltage E recovers, the operation of the embodiment shown in FIG. 5 becomes like a monarch system.

That is, when the DC voltage set value Pr*f is slightly decreased and the power supply terminal voltage E recovers and rises from the state of operation at point F on the operating curve B3 in FIG. Operating point F3 moves along a curve toward point E3.

When the operating point reaches E, the voltage V at the load end becomes
Since the value vU is reached, the upper limit comparator 32 of FIG. 5 produces an output. This output is transferred to AND gate 67.

On the other hand, in the power setting value comparator 64, the DC power setting device 65
The output of DC electric power 11! IPr,f and the scheduled transmission power Pd at that time are compared. Then, when the former is smaller than the latter, the comparator 34 produces an output and operates to open the AND gate 67.

Therefore, the DC power setting value Pr*f is the scheduled power transmission pd
, and only if the voltage V at the load end is lower than its upper limit value, the AND gate 57 is opened and allows the output of the upper limit comparator 62 to pass.

The output of the AND gate 67 is supplied to the DC power setter 65, and thereby the DC power setter 35 increases the DC power set value Praf. Therefore, the operating point moves to point F on curve B2.

When the power supply terminal voltage E further recovers, the operating point moves on the curve B2 from F2 to the point E2, and the load terminal voltage ■ again reaches its upper limit value vU. At this time, as described above, if the condition (Pr5t < Pa) is satisfied, the comparator 6
2 passes through the AND gate 37, thereby increasing the DC power set value Pref. As a result, operating point E jumps to point F on curve I,1.

On the other hand, as described above, when the direct power setting value Pr5f is changed, the output of the AND gate 67 and the comparator 33 is supplied to the generator power setting device 36 in order to suppress frequency fluctuations due to imbalance in power demand and supply. However, it is preferable to control the generated power of the generator according to the corrected DC power setting value.

The control method of the present invention described above can also be implemented by a computer. The operation in this case will be further explained with reference to the flowchart in FIG.

In step S1, the voltage v of the load end 4 and the scheduled transmission power Pd are read. In step S2, the load end voltage V is compared with its lower limit value ■L. As a result, if the load end voltage V is equal to or lower than the lower limit value VL, the process proceeds to step S3, where the DC power setting value Pr5f and the generator power setting value PG are decreased by the predetermined values.

As a result, the operating point moves, for example, from point B1 on curve B1 in FIG. As the temperature rises to -, the margin to the stable IW boundary increases compared to the previous operating state, and stability becomes greater.

As a result of the comparison in step S2, if the voltage V at the load end is lower than the lower limit value vL, the process proceeds to step S4. In step S4, it is determined whether or not the current current current membrane set value Pr5f is smaller than the scheduled power transmission value Pd.

If the determination in step S4 is not established, that is, if the scheduled power transmission value Pd is smaller than or equal to the DC power setting value Pr*f, the process is left as is and no control is performed.

On the other hand, if the determination in step S4 is established, that is, if the flow power setting value Pr*f is smaller than the scheduled power transmission value Pd, the process proceeds to step S5.

In step S5, it is determined whether the load end voltage V is lower than its upper limit value vU.

The determination in step S5 is established (- if not - i.e.
When the load end voltage V is equal to or higher than its upper limit value vU, the DC power setting value Pr@ and the generator power setting value PC are increased by the predetermined values.

On the other hand, if the determination in step S5 holds true - that is, if the load end voltage V is smaller than its upper limit value vU,
Leave as is and do not perform any control.

As described above, according to this embodiment, the DC power set value P, is adjusted as the power supply terminal voltage changes. By changing and controlling f, it is possible to always maintain sufficient margin in the operating state, and also to maintain the allowable maximum while operating with sufficient margin and suppressing voltage and frequency fluctuations at the load end. can transmit electricity.

FIG. 9 is a block diagram showing the structure of a mounting part according to another embodiment of the present invention. In the figure, the same reference numerals as in FIG. 5 represent the same or equivalent parts. 41 is a power generation power transmission device;
Reference numeral 42 denotes an in-station AC load transmission device that transmits the amount of AC load consumed in this power conversion station.

Further, 43 is a sub'n-hat which calculates the difference between the output signals of the respective transmission devices 41 and 42, that is, the amount of power P0 that can be transmitted from the generator'@bale 11 to the rM flow power transmission unit 18. 4
4 is the load end voltage ■, the upper limit value of the load end voltage VU+, the lower limit value of the load end voltage Vl-r, the scheduled DC power to be transmitted Pd+, the DC power set value Prof, and the possible DC power to be transmitted fIP, respectively, and corrected ili [This is a control device that outputs a flow power set value P'rer.]

45 is the IL flow power setting value P'r corrected as described above.
e f and the transmittable DC power t Pmv, and set the smaller of the two as the actual DC power setting value Pra.
It is a low value selector that supplies t(t) to the Cyrisk converter 14 as f.

The operation of this embodiment will be explained with reference to the flowchart in FIG. As in the case of the previous embodiment, it is assumed that the DC power transmission power of this power transmission system is set to a certain value and that operation is performed at point A1 on curve L1 in FIG.

First, in step S1, the voltage V at the load end at 7
and the transmittable direct current 1'lL power JiP□ and the power transmittable power Pa
Enter. In step S2, it is determined whether the voltage (2) at the load end 21 is greater than its lower limit value vL.

As mentioned above, as the power supply end 'α pressure E drops, the load end voltage V also decreases as shown by ~L in Figure 7.
descend. As a result of the determination in step S2, if the load end voltage V is not lower than the lower limit value vL, the process proceeds to step S3, where the current if current power setting value P rd is changed to the scheduled value Δ
P1 is decreased, and the corrected direct current power setting value P'ref is calculated.

The corrected direct current power set value P', which was decreased and newly set in step S6. f is compared with transmittable DC power jtPav in step 84. Then, depending on the magnitude relationship, the process advances to step S5 or step S6.

In these steps, the corrected DC power setting value P'raf and the transmittable 1 DC power amount pay
The smaller of the two is selected and the actual setting is changed.
It is output as f. Based on this output, the conduction phase angle of the thyristor converter 14 is controlled.

22- When the actual set value Prof is decreased, the operating point moves from, for example, point B1 on curve L2 in FIG. 7 to point D2 on curve L2, and the voltage V at the load end decreases to its lower limit value v. ■Raises to 7 or higher. At the same time, since the stability limit point in this state is C2kc, there is more margin and greater stability compared to the initial operating state. 2 The vertical E at the power supply end further decreases, and the operating point becomes curve L2J.
When the point B2Vc is reached, the voltage V at the load end becomes lower than its lower limit value yL,i again. Therefore, the same process as described above (steps S1 → S2 → S3 → S4 → S5 or S
6), the actual set value P r*f is further reduced.

As a result, the operating point moves to point D3 on the curve in Fig. 7 (-1 load end voltage V becomes 1 retarder V[, and becomes a dog. In this case, the stability limit point becomes C3. Therefore, the margin increases compared to the previous operating state, and the stability deteriorates. - The result of the determination in step S2 holds - In other words, if the load end value: fE V is lower than its lower limit value vL. , the process proceeds to step S7. In step S7, it is determined whether Akashi's DC power setting value is smaller than the planned power value pd.

If the determination in step S7 is not established - that is, if the force value Pd at the transmission schedule '11 is smaller than the DC power set values Pr and f, or if they are equal, the DC power set value Pref is not corrected. Wow, dumb step S4
- Go ahead and do the last-minute processing mentioned above.

If the determination in step S7 is established, that is, if the scheduled power transmission value Pd is larger than the DC power setting value Prof, the process proceeds to step S8. In step S8, it is determined whether the voltage V at the load end is smaller than its upper limit value vU, and if the judgment in step S8 is established - that is, the load end voltage V is smaller than its upper limit value. If the DC power setting is σP, 6! No correction is made for that -! Proceeding to step S4--, the same processing as described above is performed.

9 in step S8. If the determination is not satisfied, that is, if the voltage V at the load end is not lh lower than the upper limit f, proceed to step 89/\, and increase the current DC power set value Pref by the planned amount ΔP2, and correct it. DC power set values P, , f' are calculated.

Thereafter, the process proceeds to step S4, where the increased corrected direct current power set value is calculated as described above. It is determined whether to output f or transmittable DC power P0.

Steps S2 → S7 → S8 → S9 → S4 → as described above
S6. (or 85), the actual setting value Pra
When f is increased, the operating point moves from point C on curve L9 to point F on the curve L9, as shown in FIG. 8, for example. As a result, the voltage (2) at the load end is controlled to a value below its upper limit value.

Although the illustration and explanation of this step is omitted in FIG. 10, the actual DC power setting value P is determined as described above.
When ref is changed, in order to suppress frequency fluctuations in the power supply side AC system due to imbalance in power demand and supply, the revised DC power setting value Pr*t is supplied to the power generating power setting device 36, and the It is better to control the power generated by each generator.

As described above, according to the present invention, it is possible to transmit 25-maximum α power while controlling voltage fluctuations at load points and system frequency fluctuations within a certain value.

Further, in each of the embodiments described above, the power set value comparator 64 and AND gate 37 of FIG. 5 and the steno knob 84 of FIG. Step S7 in FIG. 10 can be omitted. In this case, the voltage V at the load end is set to its upper limit v
U or the lower limit value vL, respectively, and when the voltage at the load end exceeds the lower limit value, the DC'[power set value P□! increase or decrease by the planned amount.

Further, in each of the above embodiments, a case has been described in which the present invention is applied to a power converter station on the power transmission side, but it is obvious that the present invention can also be applied to a power converter station on the power receiving side. Furthermore, the present invention may be applied to both the power transmission side and the power reception side, and the smaller of both set values may be adopted as the actual DC d-force set value.

[Brief explanation of the drawing]

Figure 1 is a schematic single-line diagram of a normal AC/DC interconnection system, Figure 2 is a specific circuit example of a part of it, and Figure 3 is a model of one power converter station in the AC/DC interconnection system shown in Figure 126-1. Figure, 4th
The figure shows the relationship between the 'α pressure at the power source end and the voltage at the load end using the DC power transmission power as a parameter. Figure 5 is a block diagram of an embodiment of the present invention. Figure 6 is a diagram showing the relationship between the voltage at the load end. FIGS. 7 and 8 are flowcharts showing the operation of each embodiment of the present invention.
The source IT pressure/load end is a positive characteristic diagram, FIG. 9 is a block diagram of another embodiment of the present invention, and FIG. 10 is a flowchart showing the operation of the embodiment of FIG. 9. 1.11... Generator, 2... Power supply end, 3.
... Transmission line, 4... Chain back end, 5... Filter and adjusting capacity, 6... AC system load, 7... DC system load, 13... Transformer for silisk converter, 14
...Thyristor converter, 17...1 voltage reactor, 18...DC transmission line, 30...Voltage transformer,
E...Reverse source end voltage, ■...Load end voltage Representative Patent Attorney Michihito Hiraki 27- Fang 3 years old 1 figure age 2 In L --J Kasumi 7 Decoy E Oki 8 Kasumi

Claims (8)

[Claims] (1) An alternating current generator, a converter that converts the generated power of the alternating current generator into direct current, and a converter that transmits the converted direct current power to a remote location.
In the control device for an AC/DC continuous yarn system, the control device includes: a means for detecting a load end voltage on the input AC side of the converter; and a means for comparing the load end voltage with an upper limit value and a lower limit value thereof. , a DC power setting means for setting the value of DC power actually transmitted via the DC power transmission line, and a comparison result by the comparison means, so that the load end voltage reaches its upper limit (+
When the voltage exceeds i, the DC power setting value to be transmitted to the DC transmission line is increased, and on the other hand, when the load end voltage falls below the lower limit value, the DC power setting value to be transmitted to the DC transmission line is increased. 1. means for decreasing the value; The AC/DC interconnection system control di It is characterized in that the voltage at the AC/DC conversion point is maintained within a specified range by this K. (2) A control device for an AC/DC interconnection system that includes an AC generator, a converter that converts the power generated by the AC generator into DC, and a DC transmission line that transmits the converted DC power to a remote location. means for detecting the load end voltage on the input AC side of the converter, means for comparing the load end voltage with its upper and lower limits, and a DC power value actually transmitted via the DC power transmission line. a DC power setting means for setting the DC power value, a means for comparing the scheduled DC power to be transmitted and the DC power value, and a means for comparing the DC power scheduled to be transmitted with the DC power value; When the planned DC power is larger than the DC power value, the set value of the DC power to be transmitted to the DC transmission line is increased, and on the other hand, when the load end voltage drops below the lower limit value, the DC power to be transmitted to the DC transmission line is increased. 1. An AC/DC interconnection system control device, comprising: means for reducing a set value of DC power to be transmitted, thereby maintaining a voltage at an AC/DC conversion point within a specified range. (3) AC generator and AC generator'#1. In a control device for an AC/DC interconnection system that includes a converter that converts the generated power of a machine to direct current, and a DC transmission line that transmits the converted DC power to a remote location, means for calculating the amount of power that can be transmitted to the converter; means for detecting the load voltage on the input AC side of the converter; voltage comparison means for comparing the load end voltage with its upper and lower limits; If the load end voltage exceeds the upper limit value, the current DC power Calculate the corrected direct current power set value by increasing the set value by the planned amount. On the other hand, when the negative # terminal voltage decreases below its lower limit value, the current (IE's 1μ current power set value is decreased by the planned amount. means for calculating the corrected direct current power setting value that has been increased or decreased; Actual DC power setting value
1. An AC/DC interconnection system control device, comprising: means for outputting an output, thereby maintaining a voltage at an AC/DC conversion point within a predetermined range. (4) In a control device for an AC/DC interconnection system that includes an AC generator, a converter that converts the generated power of the AC generator into DC, and a DC transmission line that transmits the converted DC power to a remote location. , means for calculating the power cap that can be transmitted from the AC generator to the DC transmission line; means for detecting the load end voltage on the input AC side of the converter; and determining the load end d pressure to its upper limit and A voltage comparing means for comparing with a lower limit value, a DC power setting means for setting a power value actually transmitted via the DC transmission line, and a DC power setting means for comparing the transmitted constant #L power with the DC power value. According to the comparison results of the power comparison means and the voltage comparison means, when the load end voltage exceeds the upper limit value and the scheduled transmission DC power is larger than the DC power value, the current DC power setting value is determined. On the other hand, when the load end voltage drops below the lower limit value, the corrected direct current power setting value is calculated by increasing the current DC 15 setting value by the planned amount. means for calculating a set value, selecting the lower value of the corrected direct current power set value increased or decreased as described above and the transmittable power amount calculated as described above, and calculating the actual 1. An AC/DC interconnection system control device, comprising means for outputting a set value, thereby maintaining a voltage at an AC/DC conversion point within a specified range. (5) The AC/DC interconnection system control device according to claim 1, wherein the AC/DC interconnection system control device corrects and controls the generating power setting value of the generator in accordance with the increase/decrease in the DC power setting value. (6) The AC/DC connected line system control device according to claim 2, wherein the AC/DC connected line system control device corrects and controls the generated power set value of the generator in accordance with an increase/decrease in the DC power set value. (7) The AC/DC interconnection system control device according to claim 3, wherein the AC/DC interconnection system control device corrects and controls the generating power setting value of the generator in accordance with increases and decreases in the actual DC power setting value. (8) AC/DC interconnection system 5-control device according to claim 4, characterized in that the power generating power set value of the generator is corrected and controlled in accordance with increases and decreases in the actual DC power set value. .