JPH0340857B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a voltage/reactive power control method that centrally controls the voltage/reactive power of a power system with good followability in response to load changes.

A conventional voltage/reactive power control system of this type is the one shown in FIG. In Figure 1, 1
is the central processing unit installed at the power supply station D/C, 2a
2n are a plurality of terminal control devices installed in each substation S/S, 3a to 3n are information transmission paths by uplink transmission devices, and 4a to 4n are information transmission paths by downlink transmission devices.

In addition, Fig. 2 shows the equipment configuration diagram of each substation S/S, in which 5 is a transformer, 5a is a transformer tap, 6 is a phase adjustment equipment SC consisting of a capacitor,
7 is a phase adjustment equipment SR consisting of a reactor, and 8
is the reactive power Q passing through the transformer, which is a control target, and 9 is the secondary voltage V of the transformer.

Next, the operation of the conventional voltage/reactive power control method will be explained.

First, the operational status data such as bus voltage, branch active power, and reactive power measured at various points in the system, the positions of the transformer 5 and transformer tap 5a, the on/off status of the phase modifiers SC and SR, and the branch System configuration data such as the on/off state of the circuit breakers CB is sent to the central processing unit 1 from the respective terminal control devices 2a to 2n via upstream information transmission lines 3a to 3n.
send to

The central processing unit 1 calculates and determines the optimal control for the entire system regarding voltage, reactive power, active power loss, etc., and transmits the determination results to the downstream information transmission paths 4.
It is sent to each terminal control device 2a-2n via a-4n.

As this transmission information, the concept of a target value is generally used. The terminal control devices 2a to 2n receive the reactive power Q and the system voltage V as the target values, and set a third voltage so that the current reactive power passing through the transformer Q and the transformer secondary voltage V' fall within the allowable values. According to the control pattern shown in the figure, each status of turning on or off of the phase modifiers SC and SR or raising or lowering the tap 5a of the transformer 5 is determined and controlled.

Compare the current values of voltage and reactive power at your site with the target values, and only if there is a deviation from the allowable range, integrate the amount, and when the integrated amount exceeds the specified value, phase adjustment equipment SC,
Perform on/off control of SR or transformer 5
It determines whether to raise or lower the control.

Regardless of whether the amount of deviation is large or small, once the control is performed, the integral amount is cleared, and this operation is repeated so that the integral operation is performed again from the beginning, thereby perfecting the control to the target value.

As mentioned above, the conventional voltage/reactive power control method is configured as described above, so even if the current value deviates widely from the target value, it is necessary to repeat the integral operation many times, so the tracking characteristic The problem was that it was extremely bad.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above.In addition to the target value, the central processing unit also transmits the sensitivity coefficients of voltage and reactive power to the terminal control device, and each terminal control device The purpose of this research is to provide a voltage/reactive power control method with improved tracking performance.

An embodiment of the present invention will be described below with reference to the drawings. Central processing unit 1 and multiple terminal control devices 2a~
The relationship of 2n is the same as in FIG.

FIG. 4 is a flow diagram of a control operation of a terminal control device to which a voltage/reactive power control method according to an embodiment of the present invention is applied. In the same figure, 15 is the start,
16 is a processing block that measures and imports the current values of system voltage V and reactive power Q; 17 is a processing block that measures the above-mentioned values V and Q;
Judgment block for whether or not there is deviation from the target value, 18
Similarly, 19 is a processing block for integrating the amount of deviation of each value V and Q, 19 is a processing block for clearing the integral value to zero when there is no deviation in judgment block 17, and 20 is a processing block where the amount of integration is a predetermined tolerance value. 21 is a processing block that determines which operating device is to be selected from the tap 5a of the transformer 5 or the phase adjustment equipment SC, SR, etc. when the value is greater than or equal to the allowable value; 22 is a processing block for determining the number of operations on the operating device;
3 is a processing block that supplies a control output signal to the operating device; 24 is a judgment block that confirms the completion of supply of the control output signal; 25 is a processing block that provides a time delay; and 26 is a block that clears the above-mentioned integral value to zero. The processing block 27 is a block indicating the end.

Next, the control operation of the terminal control device will be described with reference to the flow diagram of FIG. Each terminal control device 2a
2n operates at a constant cycle, and first, in processing block 16, the current values of system voltage V and reactive power Q are measured and taken in. Next, the amount of deviation from the target values of these system voltages V and reactive voltages Q is calculated and compared with the allowable range to determine whether there is deviation or not in a judgment block 17.
At this time, if the current value does not deviate from the target value, the integral value is cleared to zero and the process ends. If there is a deviation from the target value, the deviation amount of the system voltage V and reactive power Q is integrated, and a judgment block 20 checks whether the integrated amount is greater than or equal to the allowable value. At this time, if the integral amount is smaller than a predetermined tolerance value, the process ends. Furthermore, if the integral amount is greater than a predetermined allowable value, the operating device is selected as shown in FIG. That is, the selection of the tap 5a of the transformer 5 or the phase adjusting equipment SC, SR is determined. Now, if we are at the position on the ΔV/ΔQ coordinate based on the system voltage deviation ΔV (=V'-V) and the reactive power deviation ΔQ (=Q'-Q), or at the deviation point 10 in Figure 5. do.

Now, suppose that the sensitivity coefficient transmitted from central processing unit 1 is applied to tap 5a in the case of grid voltage.
A ^TAP _V , A ^SCSR _V for phase modifier SC, SR, A ^TAP _Q for tap 5a in case of reactive power, phase modifier
If A _SCSRQ is used for SC and SR, terminal control device 2
In steps a to 2n, processing is first performed by the processing block 21 to determine whether the tap 5a is lowered as an operating device serving as a control means.

Next, the processing block 22 determines the number of operations according to the following procedure. That is, V−ΔVo＜V′−A ^TAP _V ×N ^TAP _V ＜V+ΔVo
………(1) Q−ΔQo＜Q′−A ^TAP _Q ×N ^TAP _Q ＜Q＋ΔQo
………(2) However, ΔVo, ΔQo: Deviation that makes the voltage and reactive power within the allowable range N ^TAP _V , N ^TAP _Q : Number of tap operations to bring the voltage and reactive power within the allowable range This equation (1), Judging from equation (2), the number of operations of the tap 5a N ^TAP _V and N ^TAP _Q are calculated. As a result, the control is completed with the smaller number of operations N ^TAP _V and N ^TAP _Q. At this time, after controlling once by the loop of the judgment block 24 and the processing block 25, the same control operation as described above is performed continuously after a certain delay time, and the number of times the tap 5a is operated is
When N ^TAP _V or N ^TAP _Q is reached, the integral quantity is cleared by processing block 26.

As described above, according to the voltage/reactive power control method of the present invention, the sensitivity coefficients of voltage and reactive power are sent from the central processing unit to the terminal control device, while the terminal control device operates the control means using the sensitivity coefficients. By calculating the number of times and performing continuous operations after a certain delay time, there is an effect that control followability can be greatly improved.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the basic concept of the voltage/reactive power control method in the power system, Figure 2 is a system diagram showing phase adjustment equipment for voltage/reactive power control in a normal substation, and Figure 3 is the control operation. 4 is a flowchart of the control operation of the voltage/reactive power control method according to an embodiment of the present invention, and FIG. 5 is an explanatory diagram of the operation of the operating equipment controlled in the embodiment of FIG. 4. . 1...Power station D/C central processing unit, 2a to 2n
...Substation S/S terminal control device, 3a to 3n...
...Upstream information transmission line, 4a-4n...Downstream information transmission line, 5...Transformer, 5a...Tap, 6...Phase adjustment equipment consisting of a capacitor, 7...Phase adjustment equipment consisting of a reactor, 8... Reactive power passing through transformer Q, 9
... Secondary voltage of the transformer V, 10, 11, 12,
13...Control status due to TAP lowering, 15...Start block, 16, 18, 19, 21, 22, 2
3, 25, 26... processing block, 17, 20,
24...Judgment block, 27...End block.

Claims (1)

[Claims] 1 In a voltage/reactive power control method in which target values of voltage/reactive power are transmitted from a central processing unit to multiple terminal control devices, and the voltage/reactive power of the power system is adjusted by operating the operating equipment at the controlled station. , transmitting the voltage/reactive power sensitivity coefficients in addition to the target values from the central processing unit to the terminal control device;
Further, the terminal control device calculates the number of operations of the operating device using the sensitivity coefficient when the integral value of the deviation signal between the current value of the voltage/reactive power and the target value exceeds a specified value, and A voltage/reactive power control method characterized in that the voltage/reactive power is controlled substantially continuously after a delay time.