CN102055200A - Method for calculating capacity configuration of reactive power compensation capacitor device of transformer substation - Google Patents

Abstract

The invention discloses a method for calculating the capacity configuration of a reactive power compensation capacitor device in a substation, which includes the following steps: step 1, measuring the capacities of n capacitors used for reactive power compensation in a period of time, and sampling the capacities of the n capacitors , n=1, 2, 3...; Step 2, arrange the sampled capacities of n capacitors in ascending order, and then establish a mathematical model: take the time period as the abscissa, and the capacity of the capacitor as the ordinate, according to Draw a graph of the sampled capacity from small to large; step 3, select n capacitance value points on the graph, and calculate the area of the rectangle formed by the value points of n capacitance within the range of the graph to determine the optimal The compensation capacity value of , when the area is the largest, the compensation capacity value is optimal. The invention can effectively improve the compensation effect.

Description

A Calculation Method for Capacity Allocation of Reactive Power Compensation Capacitor Device in Substation

technical field

The invention relates to a method for calculating the capacity configuration of a reactive power compensation capacitor device in a substation.

Background technique

At present, because the load is changing, if the capacitance is configured according to the peak load, according to the principle of not allowing reverse transmission, it is obvious that it cannot be used during the valley period, and the compensation efficiency is high during the peak period, but the capacitor input time is short. If the capacitance is configured according to the valley load, The capacitor has been put into operation for a long time, and the compensation effect is poor.

Contents of the invention

The invention provides a calculation method for the capacity configuration of a reactive power compensation capacitor device in a substation, which can effectively improve the compensation effect.

The present invention adopts the following technical solutions: a calculation method for the capacity configuration of reactive power compensation capacitor devices in substations, which includes the following steps: Step 1, measuring the capacities of n capacitors used for reactive power compensation in a period of time, and for n capacitors capacity sampling, n=1, 2, 3...; Step 2, arrange the sampling capacity of n capacitors in ascending order, and then establish a mathematical model: take the time period as the abscissa, and the capacity of the capacitor is On the ordinate, draw a graph according to the sampled capacity from small to large; step 3, select n value points of capacitance on the graph, and calculate the area of the rectangle formed by the value points of n capacitance within the range of the graph To determine the optimal compensation capacity value, when the area is the largest, the compensation capacity value is optimal.

When n=1 in step 3 of the present invention, when the numerical value point Q _C of this electric capacity extends horizontally horizontally and extends vertically vertically, when the area of the rectangle enclosed within the scope of the graph is the largest, then Q _C is optimal Compensation capacity value.

In step 3 of the present invention, when n=2, the values of the numerical points of the two capacitances are selected as Q _C1 and Q _C2 , and when Q _C1 =Q _C2 , Q _C1 is shown in the graph after horizontal horizontal extension and longitudinal vertical extension The rectangle enclosed within the range and the superimposed rectangle of Q _C1 and Q _C2 , when the area of the overlapping graph of these two rectangles within the range of the graph is the largest, then Q _C1 and Q _C2 are the optimal compensation capacity values; When Q _C1 < Q _C2 , the rectangle enclosed by Q _C1 in the range of the graph after horizontal extension and vertical extension, and the rectangle enclosed by Q _C2 in the range of the graph after horizontal extension and vertical extension Rectangle, and the superimposed rectangle of Q _C1 and Q _C2 , when the area of the graph formed by the overlapping of these three rectangles is the largest within the range of the graph, then Q _C1 and Q _C2 are the optimal compensation capacity values.

The present invention has the following beneficial effects: the present invention can simply, conveniently and intuitively calculate the optimal compensation capacity value, especially for reactive power compensation that changes irregularly within one end time, the optimal compensation capacity can be effectively calculated value.

Description of drawings

Fig. 1 is the determination schematic diagram of the compensation capacity of a group of capacitors of the present invention

Fig. 2 is a schematic diagram of determining the compensation capacity of two groups of capacitors (when Q _C1 =Q _C2 ) of the present invention

Fig. 3 is a schematic diagram of determining the compensation capacity of two sets of capacitors (when Q _C1 <Q _C2 ) of the present invention

Detailed ways

Embodiment 1: In Fig. 1, the present invention discloses a method for calculating the capacity configuration of a reactive power compensation capacitor device in a substation, which includes the following steps: Step 1, measuring the capacity of n capacitors used for reactive power compensation in a period of time , sample the capacities of n capacitors, n=1, 2, 3...; step 2, arrange the sampled capacities of n capacitors in ascending order, and then establish a mathematical model: take the time period as the abscissa , the capacity of the capacitor is the ordinate, and the graph is drawn from small to large according to the capacity of the sample; Step 3, select n numerical points of capacitance on the graph, when n=1, the numerical point Q _C of this capacitance When the area of the rectangle enclosed within the range of the graph is the largest after horizontal extension and vertical extension, Q _C is the optimal compensation capacity value.

Embodiment 2, the present invention discloses a calculation method for capacity allocation of reactive power compensation capacitor devices in substations, which includes the following steps: Step 1, measuring the capacities of n capacitors used for reactive power compensation in a period of time, and for n capacitors capacity sampling, n=1, 2, 3...; Step 2, arrange the sampling capacity of n capacitors in ascending order, and then establish a mathematical model: take the time period as the abscissa, and the capacity of the capacitor is On the ordinate, draw a graph according to the sampled capacity from small to large; step 3, select n value points of capacitance on the graph, when n=2, select the value of two value points of capacitance as Q _C1 and Q _C2 , in Figure 2, when Q _C1 = Q _C2 , the rectangle enclosed by the Q _C1 horizontal extension and the longitudinal vertical extension in the range of the graph and the superimposed rectangle of Q _C1 and Q _C2 , when this When the area of the overlapping graph of the two rectangles is the largest within the range of the graph, then Q _C1 and Q _C2 are the optimal compensation capacity values; in Figure 3, when Q _C1 < Q _C2 , Q _C1 extends horizontally and The rectangle enclosed within the range of the graph after vertical and vertical extension, the rectangle enclosed within the range of the graph after Q _C2 is extended horizontally and vertically, and the rectangle after the superimposition of Q _C1 and Q _C2 , when this When the area of the graph formed by the overlapping of the three rectangles is the largest within the range of the graph, then Q _C1 and Q _C2 are the optimal compensation capacity values.

Claims (3)

1. A calculation method for substation reactive power compensation capacitor device capacity configuration, it comprises the following steps: Step 1, measure the capacities of n capacitors used for reactive power compensation in a period of time, and sample the capacities of n capacitors, n=1, 2, 3...; Step 2, arrange the sampled capacities of the n capacitors in ascending order, and then establish a mathematical model: take the time period as the abscissa, and the capacity of the capacitor as the ordinate, and draw a graph according to the sampled capacity from small to large; Step 3, select n numerical points of capacitance on the graph, and calculate the size of the rectangle formed by the numerical points of n capacitance within the range of the graph to determine the optimal compensation capacity value. When the area is the largest, the compensation The capacity value is optimal. 2. The calculation method of the capacity configuration of the reactive power compensation capacitor device in the substation according to claim 1, characterized in that when n=1 in the step 3, after the numerical point _Q of the capacitance is horizontally extended horizontally and vertically vertically extended When the area of the rectangle enclosed within the range of the graph is the largest, then Q _C is the optimal compensation capacity value. 3. according to the calculation method of the substation reactive power compensation capacitor device capacity configuration described in claim 1, it is characterized in that in the step 3 when n=2, the value of choosing the value point of two capacitances is Q _C1 and Q _C2 , when Q _C1 = Q _C2 , the rectangle enclosed by the horizontal and vertical extensions of Q _C1 and the superimposed rectangle of Q _C1 and Q _C2 in the range of the graph, when the two rectangles overlap, the graph is on the curve When the area within the range of the graph is the largest, then Q _C1 and Q _C2 are the optimal compensation capacity values; when Q _C1 < Q _C2 , Q _C1 is surrounded by horizontal and vertical extensions within the range of the graph The rectangle formed by the horizontal and vertical extension of Q _C2 and the rectangle enclosed by the vertical extension of Q C2 within the range of the graph, and the rectangle formed by the superimposition of Q _C1 and Q _C2 , when these three rectangles overlap, the graph formed is within the range of the graph When the area within is the largest, then Q _C1 and Q _C2 are the optimal compensation capacity values.

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