JPH11206018A - Substation voltage / reactive power control device - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a substation voltage / reactive power control device that enables equal frequency control of phase adjustment equipment even with respect to errors in a voltage transformer and system conditions. SOLUTION: Substation voltage / reactive power control unit 2 of system
The control targets 0 and 21 are, for example, one load-time tap switching transformer, and one power condenser and one shunt reactor for the phase adjustment equipment. The voltage / reactive power control units 20 and 21 collect the voltage / current data from the transformers 1, 2, 3 and 4 and the current transformers 5 and 6. Of the transformer primary voltage, the secondary voltage and the reactive power passing through the transformer by controlling the tap control and turning on / off of the phase-breakers 9, 10, 11, 12 of the power capacitors 13, 15 and the shunt reactors 14, 16. Perform control. Further, the substation voltage / reactive power control units 20 and 21 are connected to a communication path 22 to mutually transmit and receive and use the collected voltage data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substation voltage / reactive power control device which controls taps of a load tap changeover transformer such as a substation and controls phase adjustment equipment.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional substation voltage / reactive power control device (also referred to as a VQ control device) installed at two (generally, a plurality of) substations. This device is
Independent control is performed for a system having primary buses 39 and 40 different from each other and secondary buses 41 and 42 different from each other. Therefore, for the system of the primary bus 39 and the secondary bus 41, the voltage / reactive power control unit 43
, And a voltage / reactive power control unit 44 is provided for the system of the primary bus 40 and the secondary bus 41.

Hereinafter, a detailed configuration of FIG. 2 will be described. The on-load tap switching transformers 29 and 30 are provided between the primary bus 39 and the secondary bus 41 and between the primary bus 40 and the secondary bus 41, respectively. These transformers 29 and 30 include:
The power capacitors 35, 37, the shunt reactors 36, 38, and the phase breakers 31, 32, 33, 34 are respectively connected. The transformers 29 and 30, the capacitors 35 and 37, the reactors 36 and 38, and the circuit breakers 31 to 34 constitute so-called phase adjusting means. The voltage / reactive power control units 43 and 44 take in the primary voltage and the secondary voltage from the primary buses 39 and 40 and the secondary buses 41 and 42 via the transformers 23, 24, 25 and 26, respectively, and , 28 through a transformer 29,
30, the tap current of the load tap change transformers 29, 30 and the input / output of the circuit breakers 31, 32, 33, 34 of the capacitors 35, 37 and the reactors 36, 38 are taken based on the taken data. A disconnection control is performed, whereby each controls the primary voltage and the secondary voltage of the transformer and the reactive power passing through the transmission line or the transformer.

Further, the voltage / reactive power control units 43 and 44 respectively perform equal frequency control of the phase adjustment equipment. Equal frequency control is intended to equalize the tertiary voltage of each bank, equalize the input amount of phase adjustment equipment for each bank, equalize the number of times the phase adjustment equipment is opened and closed, and equalize the operation time of the phase adjustment equipment. The purpose is to: FIGS. 3A and 3B show the equal frequency control method. FIG. 3 shows four banks # 1B to # 4B and three groups (group A—starting point, group B, and group C).
FIG. 3A shows a rotary type order selection, and FIG. 3B shows an order selection when there is an unused setting bank. The bank refers to equipment to be controlled, and for example, the transformers 29 and 30 in FIG. 2 are called bank # 1 and bank # 2, respectively. In the rotary type, the order is selected in the order of the routes L _1, ..., L ₅ , and the route returns first through the route L ₆ . In the non-use setting equation, a method of avoiding a double circle of unused portions, sequentially selecting routes L ₁ ... → L ₁₀ and returning to the beginning through route L ₁₁ is adopted. The rotary type shown in FIG. 3A is fundamental, and the non-use setting type shown in FIG. 3B is an exception. That is, the input priority order of the phase control equipment of the equal frequency control is the bank 1 (original substation voltage /
The youngest bank that is controlled by the reactive power controller)
From the starting point A group of the above, is based on a rotary type order selection. For example, priority is given to the input of the phase adjustment equipment (including the phase adjustment equipment in the non-use setting) from the bank with the smallest input amount, and if the input selection phase adjustment is in the non-use setting, there is a control margin in that bank. If there is, the next phase adjustment of the bank is controlled. The priority order for tripping the phase adjustment equipment of the equal frequency control is to select a rotary type order from the group A of the starting point of the bank 1 (which is originally the youngest bank which is controlled by the substation voltage / reactive power control unit). As a basic rule, phase-shifting equipment is removed from the bank with the largest input (including phase-shifting equipment that is not in use)
Priority, and if the trip selection phase is set to non-use,
If there is a control margin in the bank, the control of the next phase of the bank is performed. The detailed description and the operation method of the conventional substation voltage / reactive power control device are described in the following documents, and thus are omitted here. (1) "Progress in local control technology for voltage and reactive power": Extra edition of Electric Calculation (Vol. 41, No. 507) (2) "Development of digital voltage and reactive power control device":
1987 National Meeting of the Institute of Electrical Engineers of Japan (3) "Development of a new type of VQ controller applied to microcomputers": National Meeting of the Institute of Electrical Engineers of Japan in 1987 ": 1989 National Convention of the Institute of Electrical Engineers of Japan No. 11
[04] One of the conventional examples is disclosed in JP-A-5-130738. In this conventional example, a target voltage value and a target reactive power value of a bus are given, and phase adjustment control is performed so as to obtain these values.

[0005]

The conventional substation voltage / reactive power control apparatus shown in FIG. 2 uses the error and system conditions of the voltage transformer (that is, the system or secondary system having the same primary bus but different secondary buses). Depending on the system in which the primary bus is the same and the primary bus is different), only the specific phase adjusting equipment is controlled to be turned on / off, and the equal frequency control of the phase adjusting equipment may not be performed. Further, Japanese Patent Application Laid-Open No.
No. 30738 does not assume an example in which the primary bus is common or an example in which the secondary bus is common. A monitoring point is provided, and by monitoring the voltage and current at the monitoring point, a deviation from a target value is monitored and target control is performed. When a common bus is used, it is indispensable to control the phase using the characteristics. It is an object of the present invention to provide a substation voltage / reactive power control device capable of controlling the frequency of phase adjustment equipment at the same frequency even with respect to such errors of the voltage transformer and system conditions.

[0006]

SUMMARY OF THE INVENTION The present invention provides a substation voltage for controlling a substation voltage and a reactive power in a substation in which one of a primary bus and a secondary bus has a common bus system. In the reactive power control device, a voltage / reactive power control means is provided corresponding to the phase adjustment equipment including the transformer, and a substation voltage is provided between each control means and a communication system for exchanging information with each other. A reactive power control device is disclosed.

Further, according to the present invention, each control means includes means for taking in the voltage of the primary side bus of the self side and the voltage of the secondary side bus of the self side via a transformer, and a current transformer for passing a current passing through a corresponding transformer. Means for receiving the voltage of the common bus from the partner control means via the communication path, and the bus voltage obtained from the transformer on the own side with respect to the common bus and transmitted via the communication path. Means for determining an appropriate bus voltage from the bus voltage obtained from the other transformer, and the bus voltage and the current transformer taken in through the appropriate bus voltage and other transformers on the own side. A substation voltage / reactive power control device including: means for controlling a voltage and a reactive power on the own side by using the taken-in transformer passing current at least as a parameter.

Further, in the present invention, the means for obtaining an appropriate bus voltage includes means for obtaining an average value of a bus voltage on the self side and a bus voltage on the other side and obtaining the average value as a proper bus voltage. A reactive power control device is disclosed.

Further, according to the present invention, the means for determining an appropriate bus voltage includes means for setting the other bus voltage to an appropriate bus voltage when one of the self-side bus voltage and the other-side bus voltage is abnormal. , A substation voltage and reactive power control device.

Further, according to the present invention, at least one control means includes means for taking in the voltage of the primary side bus and the secondary side bus of the own side via a transformer, and converting the current passing through the corresponding transformer. And means for controlling the voltage and reactive power of the self side using at least the taken voltage and current as parameters, and the control means other than the above includes a means other than the common bus. Means for taking in the voltage of the bus on its own side via a transformer, means for taking in the current passing through the corresponding transformer via a current transformer, and means for taking in via the common bus transformer in the at least one control means Means for inputting the voltage through the communication path, and using the voltage input through the communication path, the bus voltage on its own side, and the passing current of the corresponding transformer as at least parameters. And means for controlling his own side of the voltage and reactive power, discloses a substation voltage and reactive power control apparatus having a.

Further, the present invention provides a substation voltage / reactive power control device for controlling a substation voltage / reactive power in a substation in which either the primary bus or the secondary bus has a common bus system. In, in response to the phase adjustment means including the transformer,
A reactive power control unit is provided, and a communication system for exchanging information between the control units is provided.
The phase adjustment equipment including the transformer has at least a transformer with a tap, a power capacitor and a shunt reactor provided via a circuit breaker, and the communication system has a common bus voltage measured on its own side. The control means performs tap switching of the tapped transformer and opening / closing of the circuit breaker using at least the bus voltage and the transformer passing current from the partner as parameters. Control power,
The disclosed substation voltage and reactive power control device is disclosed.

Further, according to the present invention, in addition to the self-bus voltage, the communication path sends its own circuit breaker switching frequency information to each other. A substation voltage / reactive power control apparatus that uses a power control as one of the control parameters of a phase adjustment facility is disclosed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a substation voltage / reactive power control device installed in one substation according to the present invention. This device performs independent and related control on a system having the same primary bus 17 and secondary buses 18 and 19 different from each other. That is, a voltage / reactive power control unit 20 is provided for the system of the primary bus 17 and the secondary bus 18, and another voltage / reactive power is provided for the system of the primary bus 17 and the secondary bus 19. The control unit 21 is provided. Further, the two control units 20 and 21 communicate with each other via the data communication path 22.
Connect with.

The detailed configuration of FIG. 1 will be described below. The load tap change transformers 7 and 8 are respectively connected to the primary bus 1
7 and the secondary bus 18, the primary bus 17 and the secondary bus 19
And between them. The transformers 7 and 8 have power capacitors 13 and 15 and a shunt reactor 1 respectively.
4, 16, and the phase breakers 9, 10, 11, 12 are connected. These are examples of the phase adjusting means. The voltage / reactive power control units 20 and 21 take in the primary and secondary bus voltages from the primary bus 17 and the secondary buses 18 and 19 via the transformers 1, 2, 3, and 4, respectively, and The current passing through the transformers 7 and 8 is taken in through 6. Further, the control units 20 and 21
Means that the primary bus voltage obtained by the transformers 2 and 1 is received from the partner control units 21 and 20 via the communication path 22. The control units 20 and 21 determine the primary bus voltage (appropriate bus voltage) to be used in the calculation from the primary bus voltage collected by the control unit and the partner primary bus voltage received via the communication path 22.
Is calculated. As a calculation method, there are a method of obtaining an average value of the two, a method of using a voltage change due to a temporal transition, and the like. Based on the current thus obtained, the calculated primary bus voltage, the secondary bus voltage, and the switching frequency information, each control unit 20
21 is a tap control of the on-load tap switching transformers 7 and 8;
The on / off control of the capacitors 13, 15 and the circuit breakers 9, 10, 11, 12 of the reactors 14, 16 is performed so that the primary voltage and the secondary voltage of the transformer and the reactive power passing through the transmission line or the transformer, respectively. Control.

The control function and calculation of this substation voltage / reactive power control device are based on the following four basics. (1), V ₁ -V ₂ control When the integral of the deviation of the primary voltage or the integral of the deviation of the secondary voltage exceeds a specified value, the values of the primary voltage and the secondary voltage at that time Is used as a parameter, and a phase control facility or tap control output is transmitted. (2), when the integrated amount of the integral amount or reactive power deviation of the deviation of the V ₂ -Q ₁ control secondary voltage exceeds a predetermined value, the secondary-side voltage at that time, the value of the reactive power The control output of the phase adjustment equipment or tap is transmitted as a parameter. The reactive power of each control target transformer is calculated based on the primary side bus to which the transformer is directly connected and the primary side passing current. (3), V ₂ control When the integral of the deviation of the secondary voltage exceeds the specified value,
The value of the secondary voltage at that time is used as a parameter, and the phase control equipment or tap control output is transmitted. (4) High-speed opening / closing function of phase adjustment equipment If the deviation of the primary side voltage from the reference value becomes larger than the set value, the phase adjustment equipment is opened and closed after a certain period of time without performing the integral operation, and the voltage is quickly adjusted within the appropriate range. To control.

FIG. 4 shows a specific flowchart of the substation voltage / reactive power control device of the present invention. Control unit 2 on the left
The flow on the right side and the flow on the right side of the control unit 21 are the same processing contents. Primary-side bus voltages V ₁₁ and V ₁₂ are input from the transformers 1 and 2 on the own side (steps S22 and S3).
6). The primary-side bus voltages V ₁₁ and V ₁₂ are sent to the other party substation voltage / reactive power controllers 21 and 20 via the communication data transmitter / receiver (steps S23 and S37). The input data addition processing unit adds the own bus voltage and the partner bus voltage (steps S24 and S38). The added input data is averaged by an average value processing unit, and the primary-side appropriate bus voltage V ₁
Is obtained (steps S26 and S40). In addition, the secondary bus voltages V ₂₁ and V ₂₂ and the passing currents (bank primary currents) I _mn and I _mp are transmitted via the secondary transformers 3 and 4 and the current transformers 5 and 6 on the own side.
(Steps S25 and S39). Further, the status of the busty section CB / LS device on the primary side is confirmed (steps S27 and S41). Primary bus voltages V ₁₂ , V input by the other substation voltage / reactive power controllers 21, 20
_Referring to FIG. ₁₁ , the non-voltage detecting unit determines whether or not there is no voltage (steps S28 and S42). Further, on condition that there is no voltage, the primary-side bus system discrimination processing section sets the primary-side bus CB
It is determined whether or not the primary system is separated based on the information confirmed by the LS device information confirmation processing unit (steps S29 and S4).
3). If it can be determined that there is no system separation, step S2
6, the V ₁ determined in step S40 that the primary proper bus voltage of the normal (step S30, S44). In the case of no-voltage detection or system separation detection, the own primary skin bus voltage is applied as the primary-side proper bus voltage (steps S31 and S45). In steps S32 and S46, a system determination is performed, and an integral operation or a high-speed phase control operation is performed (steps S33 and S4).
7). The contents of the integration operation and the phase adjustment high-speed control operation have been described in item No. 0015. The control output unit sends a control output command to the control target (steps S34 and S48).

According to the present embodiment, when the primary bus is the same, the primary bus voltage is taken in from the partner via the communication path 22. Even if there is an accuracy error in the transformers 23 and 24, an appropriate primary bus voltage is obtained from both, and by using this, a highly accurate control of the voltage / reactive power and the equal frequency of the phase adjustment equipment are performed. Control became possible.

FIG. 5 shows another embodiment of the substation voltage / reactive power control of the present invention. This device has one feature in that the transformer 2 on the control unit 21 side is removed as compared with FIG. The control unit 21 receives the primary bus voltage measured by the transformer 1 from the partner control unit 20 via the communication path 22 instead of the input from the transformer 2. Of course, as in FIG. 1, the control unit 21 mutually receives the information on the number of times the phase adjustment equipment has been opened / closed from the other party, the received primary bus voltage of the other party, the secondary bus voltage from the transformer 4, and the current from the current transformer 6. The tap switching control and the on / off control of the circuit breakers 11 and 12 are performed using the current and the switching frequency information. On the other hand, the control unit 20 uses the voltage from the transformers 1 and 3, the current of the current transformer 5, and the number of times of switching to control the tap switching control and the circuit breaker 1.
On / off control of 1 and 12 is performed. Such tap switching control,
The on / off control controls the transformer primary voltage, secondary voltage and transmission line or transformer reactive power. Then, since the control unit 21 takes in and uses the measured primary-side bus voltage of the partner control unit 20 via the communication system path 22, the primary bus voltages of the two match and the two are used. Became possible.

Although the control units 20 and 21 are provided in one substation, there may be an example where they are provided in different substations. There are various types of communication paths, such as an example using an electric wire, an optical fiber, or a bus itself. There are also wireless routes. Furthermore, the primary bus is the same, but the secondary bus is the same,
In the example of the system where the primary bus is different,
The same applies. There is also an example in which, as data to be sent to the communication path, in addition to voltage, current and the number of times of phase adjustment switching are sent. The other party uses this for the capture control.

[0020]

According to the present invention, a plurality of substation voltage / reactive power control units connected to the same primary-side bus and the like are provided with means for transmitting / receiving their own voltage and the like to / from the other party via a communication path. . As a result, only the specific phase adjustment equipment is controlled to be turned on and off depending on the error of the voltage transformer and system conditions, and the equal frequency control of the phase adjustment equipment may not be performed.The primary bus is the same and the secondary bus is different. Even for systems with the same secondary bus but different primary buses, it is possible to control the frequency of the phase adjustment equipment at the same frequency. In addition, stable power supply was achieved, and maintenance of the phase adjuster was reduced.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a substation voltage / reactive power control device of the present invention.

FIG. 2 is an overall configuration diagram of a conventional substation voltage / reactive power control device.

FIG. 3 is an explanatory diagram of equal frequency control of a substation voltage / reactive power control device.

FIG. 4 is an example of a flowchart of the present invention.

FIG. 5 is an overall configuration diagram of a substation voltage / reactive power control device of the present invention.

[Explanation of symbols]

 1-4 Voltage transformer 5, 6 Current transformer 7, 8 Tap switching transformer under load 9-12 Phase-break circuit breaker 13, 15 Power capacitor 14, 16 Shunt reactor 17 Primary bus 18, 19 Secondary bus 20 , 21 Substation voltage / reactive power control unit

Claims (7)

[Claims] 1. A substation voltage / reactive power control device for controlling a substation voltage / reactive power in a substation in which one of a primary bus and a secondary bus has a common bus system. A substation voltage / reactive power control device provided with voltage / reactive power control means corresponding to a phase adjusting facility including a transformer, and a communication system for exchanging information between the control means. 2. Each of the control means includes means for taking in the voltage of the primary side bus of the self side and the voltage of the secondary side bus of the self side via a transformer, and a current passing through a corresponding transformer via a current transformer. Means for taking in, a means for taking in the common bus voltage from the partner control means via the communication system, and a counterpart sent via the communication system with the bus voltage obtained from the transformer on its own side with respect to the common bus. Means for obtaining an appropriate bus voltage from the bus voltage obtained from the transformer on the side, and the bus voltage obtained via the other appropriate transformer on the own side and the bus voltage obtained from the current transformer on the own side. 2. The substation voltage / reactive power control device according to claim 1, further comprising: means for controlling a voltage and a reactive power on its own side by using at least a transformer passing current as a parameter. 3. The substation according to claim 2, wherein said means for determining an appropriate bus voltage includes means for calculating an average value of a bus voltage on its own side and a bus voltage on a partner side to obtain an appropriate bus voltage. Voltage / reactive power control device. 4. The means for determining an appropriate bus voltage includes means for setting the other bus voltage to an appropriate bus voltage when one of the self-side bus voltage and the other-side bus voltage is abnormal. The substation voltage / reactive power control device according to claim 2. 5. The at least one control means includes means for taking in the voltage of the primary side bus of the own side and the voltage of the secondary side bus of the own side via a transformer, and a current transformer for passing a current passing through a corresponding transformer. Means for controlling the voltage and the reactive power on the self side by using at least the obtained voltage and current as parameters. Means for taking in the voltage on the side bus via a transformer, means for taking in the current passing through the corresponding transformer via a current transformer, and means for taking in via a common bus transformer in said at least one control means. Means for inputting a voltage via the communication path, and a voltage input via the communication path, the bus voltage on the self side, and the passing current of the corresponding transformer as at least parameters, and 2. The substation voltage / reactive power control device according to claim 1, further comprising: means for controlling the voltage and the reactive power. 6. A substation voltage / reactive power control device for controlling a substation voltage / reactive power in a substation in which one of a primary bus and a secondary bus has a common bus system. A voltage / reactive power control means is provided corresponding to the phase adjusting means including a transformer, a communication path for exchanging information between the control means is provided, and the phase adjusting means including the transformer is a tap. At least a power transformer and a power capacitor and a shunt reactor provided via a circuit breaker. The communication system sends a common bus voltage measured by itself to the other party, and the control means The substation controls the voltage and reactive power based on the tap voltage of the transformer with tap and the opening / closing of the circuit breaker, using at least the bus voltage and the current passing through the transformer from the transformer. Voltage, invalid Power control device. 7. The communication system according to claim 1, wherein, in addition to its own bus voltage, its own circuit breaker switching frequency information is mutually transmitted to the other party. 7. The substation voltage / reactive power control device according to claim 6, wherein the substation voltage / reactive power control device is used as one of the control parameters of the phase adjustment equipment.