JPH02206331A - Method of controlling voltage and reactive power - Google Patents

Abstract

PURPOSE:To keep system voltage stable by controlling the voltage and reactive power of a system within the limits of a blind sector provided in and around a set target value with the primary side bus voltage and secondary side bus voltage of a controlled transformer as control variables. CONSTITUTION:With the primary side and secondary side bus voltage of a controlled transformer 6 as control variables the voltage and reactive power of a power system is controlled within the limits of a blind sector 4 provided in and around the set target value. Consequently, a control vector 5 of each voltage regulator on a V-V plane with the primary side bus voltage V1 on the vertical line and the secondary side bus voltage V2 on the horizontal line will face the direction of a point of intersection 3 of a rectangular coordinate axis, so that the primary side and secondary side bus voltage V1 and V2 deviated from the blind sector 4 by system disturbance can be converged effectively.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a single voltage/reactive power control method for controlling voltage/reactive power in a power system using a phase modifier and a controlled transformer. Demeru.

[Prior Art] Figure 3 is a diagram showing the control range of voltage and reactive power by a conventional voltage and reactive power control method.
(2) The voltage v2 of the secondary bus of the transformer is plotted on the horizontal axis (2
1 is the primary side passing invalid force Q of the control transformer.

I took v-c4. FIG.

The intersection point (origin) (3;
A dead zone +41 is provided at time 0 and 9 to prevent hunting, and the secondary bus' voltage v2 and the primary open-pass reactive power Q are controlled within the dead zone by the following equipment control. do.

That is, 2. by disturbances in the power system.

Current quadratic-m, IsF! The pressure v2 and the primary 1i1
When the zero passing reactive power Q is in the first quadrant of the above v-Q plane, lower the I and RT tags of the controlled transformer 111, and when it is in the second quadrant, the shunt reactor (hereinafter referred to as ShR) is lowered.
(hereinafter abbreviated as ) or power capacitor (hereinafter referred to as
(abbreviated as Sa), etc., are turned off. If it is in the 3rd quadrant, raise the LRT tap, if it is in the 4th quadrant, turn on So, 7) or turn off 13hR.

The arrow shown in the figure indicates the direction of change in v21Q1 due to the operation of each device. Therefore, by the above device selection method, v2
To efficiently control 1Q1 into a dead zone, the conventional voltage/reactive power charge control method is configured as described above.
It is assumed that the primary side short-circuit capacity of the controlled transformer is larger than the secondary side mNt capacity. According to this premise,
Voltage fluctuations due to system disturbance mainly occur on the secondary 111Il bus, and voltage fluctuations on the primary bus can be ignored.

However, due to the configuration of the controlled system, when the primary side 9f1 circuit capacity of the controlled transformer is smaller than the secondary side short circuit capacity, the primary side voltage also fluctuates greatly due to the disturbance, and as shown in Figure 4, the primary side voltage fluctuates greatly. The next-side puncture-passing reactive power Q does not show the same change as before. Therefore, in the case of Fig. 4, SC should be inserted.

In the conventional method, lv2<0. Since Δact,,<o, the LRT tap is controlled to be lowered, and the primary bus 1
The problem is that the voltage is further lowered and the opposite effect occurs. This invention was made to solve this problem, and the primary short circuit valley amount of the controlled transformer is
Even if the power system is smaller than Tanizaki.

The purpose of this study is to obtain a voltage/reactive power control method that can maintain stable system pressure.

[Means to solve crystal]

The 1-pressure/ineffective force control method according to this invention is as follows.

The primary 1111I and secondary side bus voltages of the controlled transformer are used as control variables to control the voltage and reactive power of the power system to the same dead band provided around the set target value.

[Effect]

In this invention, the voltage and reactive power of the system are controlled by using the primary and secondary bus voltages of the controlled transformer as the control variables, so that the negative side ffl circuit capacity is It maintains system pressure stably even in a smaller power system compared to IJ!i connection.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows the v-'v plane when each variable is set on the orthogonal coordinate axes, but the selection of restricted 0I41 equipment such as LRT tap, ShR, So etc. is as follows depending on the quadrant.0 1st R limit (lv>o , lv2>O): ShR input,
Mataha SC cut second quadrant (ΔV,) 0. lv2 (Q): LRT tap up 3rd quadrant (lv <at lv2ku 0): SC throw up or ShR cut 4th quadrant CIV (0, lv2>0)
: LRT tag lowering Figure 2 is a model of the electric power system when considering voltage and reactive single force control at the air station. In the figure, n is the LRT tap of the controlled transformer 6, q is the phase adjustment equipment (So or 5hR), η is the primary side short circuit impedance + X2 is the quadratic law short circuit impedance. Then, the changes in the primary bus voltage and secondary bus voltage due to the operation of the LRT tag and phase modifier q are expressed using the following relational expression. However, lΩt in one formula
``1'' represents each amount of change.

From the above formula, if the LRT tag is raised (ΔΩ〉0), lv
<o, lv2>o, and lowering the LRT tag (an<o)4 results in av>o, lv2>0. Also.

sc2 input (J(t>0) t, if lv>0.l
v2>0, and ShR input (Δ(1<O)L, if lv1<mouth.

It can be seen that lv2kuO.

Therefore, vertical 111 (11 has primary side busbar 1 pressure y1. Fj
! 4+1q41t2uc Control vector of each voltage regulator on the V-V plane with voltage v2 on the secondary busbar +
51 faces toward the intersection point (3) of the orthogonal coordinate axes as shown in Fig. 1, so the bus voltages (V, V2) on the primary and secondary sides that deviate from the dead zone due to system disturbance are included in the dead zone (4). Be able to efficiently converge within.

〔Effect of the invention〕

As described above, according to the present invention, since the control variables are the primary bus voltage and the secondary bus voltage of the controlled transformer,
- Even in power systems where the short-circuit capacity on the secondary side is smaller than the short-circuit capacity on the secondary side, the system pressure can be maintained stably.

[Brief explanation of the drawing]

Fig. 1 is a V-V plan view with the coordinate axis being the control variable Vt*V2 of the direct pressure/reactive force control method according to an embodiment of the present invention, and Fig. 2 is a V-V plan view for considering the voltage/reactive power control 1g1% property. A model circuit diagram of a single-power system. Figure 3 is a V-Q plan view with the conventional control variable v29 Ql as the coordinate axis. Figure 4 shows the bank reactive power flow and the slope of the bus voltage on the primary and secondary sides. 9. In Figure 9, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a voltage/reactive power control method for controlling the voltage and reactive power of a system using a controlled transformer and phase adjustment equipment, the primary bus voltage and secondary bus voltage of the controlled transformer are used as control variables, and the A voltage/reactive power control method characterized in that the voltage and reactive power of a grid are controlled within a dead zone provided around a preset target value.