JPH0564526B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a voltage-reactive power adjusting device installed in a substation.

Conventionally, voltage-reactive power adjustment control equipment (hereinafter referred to as VQ)
(referred to as a device) is a transformer 2 installed in a substation.
The control target was determined by the configuration state of the next bus. Figures 1A and B show conventional equipment equipped with the above-mentioned VQ device.
Figure B shows a case where the low-voltage bus bar side is separated, and first, Figure 1A will be described. In FIG. 1A, reference numerals 1 and 2 are high-voltage side A/B buses, and both buses 1 and 2 are connected to the primary sides of tap transformers 3 and 4. The secondary sides of the transformers 3 and 4 are connected to A-B buses 5 and 6 on the low voltage side. The phase adjusting equipment 7, 8 connected to the tertiary side of both transformers 3, 4 is turned on/off by a first VQ device 9, which will be described later. The first VQ device 9 receives the reactive power Q of both transformers 3 and 4 via detectors 10 and 11, and also receives the voltage V of the lower bus line 5 on the low voltage side.
This first VQ device 9 generates ON/OFF operation signals 13,
14, and also sends tap lifting operation signals 15, 16 for transformers 3, 4, and both transformers 3,
4 and has the effect of keeping the sum of reactive power constant. 12 is the second VQ device, but Fig. 1A
Not used for

Next, a case will be described in which the A/B buses 5 and 6 on the low voltage side in FIG. 1B are separated. The same parts as in FIG. 1A are designated by the same reference numerals. In FIG. 1B, the first VQ device 9 receives only the reactive power Q from the detector 10, and the operation signals outputted from the device 9 are only the tap operations of the phase modifier 7 and the transformer 3. The tap operation of the phase modifier 8 and transformer 4 is as follows.
It is controlled by the output of the 2VQ device 12. 2nd VQ
The device 12 receives the reactive power Q from the detector 11, and also receives the voltage V of the low voltage side bus 6.
Based on the control results of the reactive power Q and the voltage V, the reactive power passing through the transformer 4 is controlled to be kept constant. In addition,
The first VQ device 9 only controls the reactive power passing through the transformer 3 to keep it constant;
The VQ devices 9, 12 are configured to operate independently.

On the other hand, the control target value (reference value) at the time of reactive power adjustment is the burden of the substation with respect to the reactive power supply amount necessary to maintain the voltage of the primary side system of the substation. Transformers 3 and 4 when the buses 5 and 6 shown in Figure 1B are used separately
The proportion of each reactive power share is not important. An important problem is that when changing from the busbar combination configuration shown in Figure 1A to the busbar separation configuration shown in Figure 1B, or vice versa, the 1st and 2nd VQ devices This means that the reactive power reference values 9 and 12 must be reset.

This invention was made in view of the above circumstances, and eliminates the need to reset the reference value for voltage-reactive power adjustment regardless of the connection state of the secondary bus of the transformer installed in the substation. It is an object of the present invention to provide a voltage-reactive power regulating device with no

An embodiment of the present invention will be described below with reference to the drawings, in which the same parts as in FIGS. 1A and 1B are designated by the same reference numerals.

Figure 2 shows the case where the bus bar on the low voltage side is separated. Input the power V of 5. This first VQ device 9 controls the reactive power Q and voltage V, and outputs a tap lift operation signal 15 for the transformer 3 and an on/off operation signal 13 for the phase modifiers 7 and 8 of the transformers 3 and 4. , 14. Also, the 2nd VQ
The device 12 receives only the voltage V of the low-voltage side bus 6. The second VQ device 12 outputs a tap raising/lowering operation signal 16 for the transformer 4 according to the value of the input voltage V.

The operation of the embodiment configured as described above will be described. The phase adjustment equipment 7, 8 is controlled by the on/off operation signals 13, 14 sent from the first VQ device 9, and the reactive power passing through the transformers 3, 4 is adjusted. Also, the
1VQ device 9 also sends out a tap lift operation signal 15,
This signal 15 operates the tap raising and lowering of the transformer 3. This controls the voltage of the lower bus bar 5 on the low voltage side.

On the other hand, the second VQ device 12 sends out a tap raising/lowering operation signal 16, and this signal 16 operates the tap raising/lowering of the transformer 4, thereby controlling the low voltage side bus line 6. In this way, the first VQ device 9 connects all transformers 3 and 4.
Since the passing reactive power is adjusted, the reactive power input range does not change. Therefore, even if the busbar configuration is changed from the busbar configuration shown in FIG. 2 to that shown in FIG. 1A, it is not necessary to reset the reference value, and the VQ device can be used immediately. Also,
Since only the first VQ device 9 shares the reactive power,
The following problems can be prevented. In other words, conventionally, in the case shown in FIG. 1A, the first VQ device 9 reaches the limit of the phase adjustment equipment, and even though there is adjustment capacity in the control range of the second VQ device 12, as a substation, the primary side ( (High voltage side) There was a problem that made it impossible to maintain the supply of reactive power necessary to the grid.

Furthermore, since the second VQ device 12 of the above embodiment does not have a reactive power adjustment control function, the device can be simplified and manufactured at low cost.

As described above, according to the present invention, there is no need to use the VQ device to reset the reactive power reference value even when the bus configuration on the secondary side of the transformer is changed, and operation can be started immediately. At the same time, the phase modifier equipment is operated as the entire substation, which has the effect of improving the efficiency of the equipment.

[Brief explanation of the drawing]

1A and 1B are circuit diagrams showing a conventional device, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1, 2... High voltage side A/B bus, 3, 4... Transformer, 5, 6... Low voltage side A/B bus, 7, 8... Phase adjustment equipment, 9, 12... 1st, 2nd VQ device ,10,
11...Detector, 13, 14...On/off operation signal,
15, 16...Tap up/down operation signal.

Claims (1)

[Scope of Claims] 1. In a substation in which two low-voltage buses are separately connected to the secondary side of a transformer, and the two low-voltage buses are provided separately, a plurality of such buses are installed in the substation. The output of only one of the voltage-reactive power adjustment control devices used to control the tap raising and lowering of one transformer and the on/off operation of the phase adjustment equipment of all transformers, 1. A voltage-reactive power adjustment device characterized in that the output of the power adjustment control device is used to perform only tap raising and lowering operations of local transformers.