JPS58186338A - Power controller - 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 generates nine magnetic forces using a plurality of generators and transmits them to a load g4t in a power transmission system consisting of a DC power transmission line and an AC power transmission line.
: When supplying (-1) Relating to a power control device ζ that controls the ratio of transmitted power between a DC transmission line and an AC transmission line.

As the power system expands in size, the capacity of the generators being constructed continues to increase.

Since the construction sites for trenches and false power stations are far from the load centers, it is becoming necessary to transmit large amounts of power over long distances. However, when transmitting large amounts of power over long distances using conventional AC power transmission systems,

It is well known that stability problems arise.

To solve the stability problem, (1) increase the number of power transmission lines (m) apply series capacitors. (8) Installation of intermediate switchyards, etc., but increasing the number of four power transmission lines in (1)
The construction costs would be enormous and it would not be appropriate for the government. (2) Series capacitors are known to induce axial torsional vibrations in the rotor of generators and turbines, and it is difficult to prevent axial torsion, so there is a limit to the use of series capacitors. . (8) The installation of an intermediate switchyard also costs a lot of money, so shipping is not necessary.
In order to reduce the E/B dance, C2 requires the installation of many intermediate switching stations, which is not practical.

By the way, with the progress of semiconductor technology, the credit tax is getting better.
As thyristor elements with lateral pressures and large km can be manufactured, high-power DC power transmission is being laughed at even in Japan. By applying this direct power technology, long-distance, high-power power transmission as mentioned above becomes possible. Initial load control when connecting machines in parallel is complicated in the case of direct current 4L power transmission, and frequency control at low load times of the generator is difficult (two-way system configuration). Due to various conditions, it has become necessary to provide a power transmission system and an AC power transmission system to transmit large amounts of power over long distances.

#1 Diagram C, such a DC transmission system and AC transmission power (
Hereinafter, it will be abbreviated as a hybrid power transmission system)≦Second An example of a system that transmits large power over a long distance will be shown. The following explanation will be given with reference to FIG. 1. Generally, a plurality of generators are installed, but in this example, two generators are shown as one representative.

It is an earthen transformer with a transformer of 3Fi and a generator of 1.2.

-S of the generated electric power, 4 pressure generators for plexi, 5
The power is transmitted back to WL* via the power transmission line 6. Then, the inverse converter 7c installed in contact with the negative i-phrase end is converted into an alternating current 'torque' force, valves the low-pressure part 8 for conversion, and the current converter 6's two-tangential pillow δ It will be done. - A part of the electric power generated in the power generation rocks 1 and 2 is transmitted to the alternating current trench via the grid transformer -9 through the AC-containing Kagojiro 10 and the grid transformer 11.

In such a hybrid power transmission system, t! The question is how to set the power transmission ratio between the power transmitted in the L-flow system and the power transmitted at 1A in the AC system. On the side of this ratio, there are (1) a method of controlling the AC transmitted power at a constant level, (1) a method of controlling the DC transmitted power at a constant level, (8) a method of sharing the transmitted power between the AC system and the There are ways to control it.

Here, set the AC transmission power to 1 blil so that it is constant.
In this method, the AC transmission power is constant and we generate 11L.
Shin's phase difference angle is constant for the line during operation, which improves the spread of electricity.However, when the operational status of the power transmission line changes, the line impedance also changes, so the line may become sharper. . When the AC transmission power is constant, changes in the operational status of the transmission line 11L may cause an intermittent drop, and in order to predict this seismic interval, the operational status of the line is constantly monitored. The following control is required to correspond to the state-change C2. Therefore, it is necessary to transmit power from the Nakanaseki closed area installed at multiple locations to the state of the power transmission system.If the generated power is lower than the AC transmission power setting value, it is necessary to stop the DC transmission system. This is not desirable as it reduces the equipment operating rate.

On the other hand, DC transmission [methods that control power at a constant level]

Since the firing angle of the conversion gain can be controlled to be constant, the device is simple. However, if the output power 1lIEit changes, the transmitted power on the variable current transmission side changes, so the phase difference angle of the generator changes, which is unfavorable in terms of stability. In addition, it has the disadvantage of the AC transmission power setting control method and 1'0111 in that the AC transmission thread d1 cannot be used unless the output t1 exceeds the DC transmission power.

Also, suppose that repairs occur on the AC system side.

This means that the th current is ax8 current, but when it becomes DC independent power transmission, the generator will be operated asynchronously with the negative gradient system. As a result, the number of millimeters per generator will fluctuate, which is not an undesirable measure for the operation of the power plant, but may also cause the maintenance relay to stop the generator to operate. - 1. In hybrid power transmission and DC 4-way transmission, when the system configuration changes, 6. 2. Fluctuations in the wave number of the grid and fluctuations in the active power occur, so in order to operate the generator stably, The problem is how to control the power transmission system.So, during hybrid power transmission, the sharing ratio between the power transmitted by the DC system and the power transmitted by the AC system is controlled, and when only DC power is transmitted, -2, a method has been considered in which the frequency of the generator is controlled to be constant. However, when switching from DC-only power transmission to hybrid power transmission, or from hybrid power transmission to DC-only power transmission, switching 5: Therefore, frequency fluctuations and active power fluctuations in the grid may occur, so generation There was a risk that the aircraft would have to be stopped.

5@Akira's Purpose The purpose of the present invention is to provide an AC/DC system that can switch from direct transmission to hybrid power transmission in a combined AC/DC power transmission system, or from hybrid power transmission to DC power transmission without any disturbance. There are 6 two ways to obtain a power control device for a combined power transmission system.

Summary of the Invention Ninth to achieve this objective, in this power generation, C: frequency control function for controlling transmitted power during single DC power transmission;
A control device is provided that has a sharing ratio control function that controls the transmitted power during hybrid power transmission, and when the 1 sharing ratio control function is in operation, the generated power is controlled by frequency control - function 1 when switching to DC single power transmission. On the other hand, while the frequency control i41 frequency control is operating, the total generated power is set to the initial value of the standard value of the IL number system function when switching to hybrid power transmission. I will continue to make changes so that the exchange system will not be shaken, so that it can be changed smoothly.

Embodiments of the Invention The present invention will be explained below with reference to drawings C and two embodiments C. Figure 2 shows the origin of the block Sakaki in the case of fC, when Akira's power control device is applied to a combined AC/DC power transmission system.

The electric power generated by the IL machine 1.2 is transferred to the busbar via each generator transformer w7I3. The electric power supplied to the bus is transferred to the electric power source through the sFi transformer transformer conversion-5, and the blood flow power transmission line H6 is created to transmit the electric power to the negative power source. In the Nagai, the current is converted into a current by an inverse converter 7 installed adjacent to it, and then sent to the Nagai via a converter transformer 8. .

On the other hand, a part of the power supplied to the bus is transmitted as AC through grid transformer B9 to AC power transmission HD 30 +; . Here, the connected kIr devices 13.14 are the converter transformers 4. The circuit breakers 15 and 16 were installed in order to eliminate accidents that occurred due to the system soft transformers 9, 11 and 12, and the reverse converter 5 * 7 J2. In order to eliminate the accident that occurred in the
- Installed.

The power control system 100 includes a detection 101 that detects the frequency of the bus voltage, a detection 9102 that detects the active power of the AC system, and a detector 1 that detects the active power of the DC system.
0B, and a rental W8 plum control device 17 for controlling the converter 5.7 to control the amount of TM flow power transmitted.

A control device 104 having each woodcutter control #a function is provided.

During hybrid power transmission, the control device 104 controls the sharing ratio of the power transmission power between the IiE system and the AC system using a sharing control function, and when transmitting power directly to direct power transmission, the generator frequency is adjusted to 6 feet C2 side using a frequency control function. - to do. During hybrid transmission, the frequency control function is set to follow the output signal of the shared control function, and during independent DC transmission, the single-share control function is set to follow the output signal of the frequency control function. In particular, it has a tracking function that allows you to closely monitor the 8-cycle fluctuations in the grid that occur when switching between hybrid power transmission and DC single power transmission, as well as the active power.

A detailed configuration diagram of a control device 1G4 having a shared control function M1 frequency control function B and a tracking Ia function C is shown. Output of 1iktIL system effective power detection 6103 No. 4Ii PDO and communication #1 system active power detection mackerel 102
By adding the output signal PAO and inputting the output signal 110c; the total electric power P't is calculated. 〇 Coefficient multiplier 31 for multiplying this total electric power amount P't by a certain coefficient.
Is the output of @111 the power standard value 1 for transmitting power through the IL-style power transmission system Hibiki? It becomes t@t. That is, the coefficient multiplier 1110
The coefficient is a value for determining the alternating and directing sharing ratio.〇koaS
If the reference value Pref of the S multiplication gonfs is added with a 6-second order lag so that the reference value Pref does not change temporarily, ξ can be made more stable.

Subtract the deviation between Todorofu Ren Pr5f and DC active power PDO *
1121: In order to stabilize the shared control system and satisfy the required speed response and control accuracy,
For example, a PID calculator is applied and inputted to the control compensation 113. On the other hand, the deviation is compensated f! with an integral lN function. 11
5 is input. In this case, the deviation is 1 during hybrid power transmission, switching where the direct 2A contact is closed and the t1 contact is open @ 114
0 and the outputs of the compensation numbers 113 and 115 are input to the adder 116, and the output is given DC power through the switch 121 in which the second contact is closed during hybrid power transmission. It is sent to the conversion control device 7 for controlling g2 so that it becomes .

Next, frequency control during single DC power transmission is performed using the frequency reference value νr・f created from the frequency reference generation number and the frequency reference value 1.
Subtract the number Fr@q from the output signal of 01! 117 to create a frequency-area difference signal D1, and output a control signal to the converter control device 17 through a control compensation @119 having an integral function. Next, the following function O will be explained. During hybrid power transmission, the 1-share control function is in operation, but the output of the 1-share control function controls the transmitted power of the DC transmission system and is not an output note for transmitting the entire electric power. Therefore, Nj[RjIiLa
When switching to power transmission, all power is transmitted through the DC transmission system.

System disruption: When some kind of accident occurs and the switch is made from hybrid power transmission to direct current single power transmission, the generated power will be lower than the transmitted power when switching to direct current single power transmission, compared to the amount of specific power transmitted by AC system during hybrid power transmission. It's also better than C9
Frequency changes ll1lI, etc. occur. Therefore, when transmitting am alone, in order to transmit all the generated power in the DC system, 1:
First, the integral element 1 is set using the total shield electric power signal py as a reference signal.
Take the difference from the output signal of 19A, and use OII as integral element 1.
19m input signal O At this time, ratio sequence/differential l! Since the input signal of the tree 119B is turned off by the switch -114g2, its output signal is zero. Therefore, integral II! Since the element 119 operates so that the input signal becomes zero, the output signal of the frequency control function always matches the total power generation amount.

Therefore, even when switching from hybrid power transmission to Illll single current power transmission, frequency fluctuation does not occur.Next, during single DC power transmission, the output signal of the coefficient multiplier 111 in the one-share control function 8 is shown in FIG. As shown in FIG. 1, R is properly translated by the switch 114 which opens the C21 contact when direct current is being transmitted alone, so the ratio coefficient KB #1 KIB C matches, and therefore the output FiKR of the integral element 123 becomes the multiplication factor. Device 1241: More total power generation - two-phase signal P! When multiplied by , it becomes 3・ate. Output signal PDOg: equal 0 Therefore, the output of subtraction 16112 in Figure 3 is zero.

Integral element 115 tj Frequency control function output signal is used as a reference signal, and the difference with the own output signal is taken, and this difference is used as the input signal, so the regular two-frequency control function output consistent with the signal.

Therefore, active power dynamic mFi does not occur even when switching from a DC single power transmission system to a hybrid power transmission system.

Hybrid power transmission 1; Immediately after switching, coefficient multiplication @ 1
Since the coefficient of 11 x @ Fi is excessive, the DC transmission system I:
All electricity is being transmitted. After that, the active power is gradually applied to the AC system side C. At a rate of change that does not cause active power fluctuation, the rate of change limit circuit shown in Figure 4 is set up. Constituent proportionality constant E1m
limiter 122. Yokobu 4! ! ! By setting the element 123, the sharing coefficient Il is set to 0 as shown in Fig.
12, the time to carbonize C from jul is i company, and the integral time constant shown in the fourth example is d.

Effects of @ size As mentioned above, the power control device of 221 @ Ming has the ability to control the sharing ratio during 1-hybrid power transmission.

It has a frequency control function during independent DC power transmission, and also allows these two functions to mutually follow the output signal I: of the function that is operating. This eliminates active power fluctuations and enables stable power transmission at all times.

In addition, in the main text, the sum of AC active power and DC active power was calculated in order to detect the total power transmitted, but the active power at each generator end was detected and the sum was calculated to generate the total power generated. It is proportional to the generator output, such as determining the main steam flow rate, turbine torque, etc. (It goes without saying that the same effect can be obtained with No. 1).

[Brief explanation of drawings]

Figure 1 is a diagram of a converter control system in a hybrid power transmission system using the hybrid power transmission system e); Figure 2 is a diagram of a converter control diagram in a hybrid power transmission system to which the power control device of this @mei is applied, and Figure 3 is an implementation of the present invention. FIG. 4 is a detailed diagram of the coefficient multiplication gain, and FIG. S is an operation diagram of the coefficient multiplication gain. 1.2... Generator 3... Takao Electric Transformer-4
,8-...Transformer for conversion sieve 5...Jll health conversion-6.
...DC transmission line 7...Reverse conversion weight 9.11...
System transformer lO-/AC transmission line 12... negative
13.14.15.16...Interruption width 17...
Conversion recommendation control device 102... Current system active power detector 103... DC system effective torque detector 104-fl! 1Jllif 110.116-
...Adder 111...Coefficient multiplier 31L 112, 116.117.118.120.121--
・Subtractor 113, 115.119... Control l Kusunoki compensator
114.121...Switching association 119A--integral 12 votes
119B...Proportional/Mild element loss 122...Limiter-123...Integral element 124--Multiplication Akira (7317) Agent Patent attorney Noriyuki Chika (and 1 other person) Fig. 1 Fig. 2

Claims (1)

[Claims] A power control device that controls the transmitted power when the power generated by a generator is transmitted through a power transmission system consisting of a DC power transmission system and an AC power transmission system. a detector for detecting the generator 0111 wave number; and a detector for detecting the AC active power of the AC power transmission system. A detector that detects the DC active power of the rt + Note @ current power transmission system, and a division that issues a first control command so that the ratio of the DC active power to the AC active power becomes a predetermined ratio during hybrid power transmission. Ratio control function and DC independent power transmission - Second, when the frequency control function issues a second control command such that the frequency of the generator becomes a predetermined value, and the sharing control function is in operation, the frequency control function When the frequency control function is in operation by causing the frequency control function to follow the frequency control function 1; and 1 the first control command or the frequency control function 1; A power control device comprising a converter control device for inputting a second control command to control the DC transmitted power.