Autocontrol method for reactive voltage of local electric power network

Abstract

An automatic control system of reactive voltage for district power network is composed of data acquisition unit, CPU and operation controller. According to the voltage conditions of substations in district power network, whether taps of main transformer in this substation or the taps of main transformer in higher-level one is determined to be regulated. When reactive current does not flow back to high-level power network, its flowing into this level power network is allowed. By predicting the voltage value after switching in / off capacitance and reactance, the switching in / off oscillasion can be avoided. Its advantages are high voltage quality, low wire loss and high power output.

Description

technical field [0001] The invention relates to an automatic control method for reactive power voltage of a regional power network. Background technique [0002] Among the current existing technologies, one is to use reactive voltage comprehensive automatic control (also known as VQC) device, which is installed in a substation with 10KV voltage level, and adjust the transformer tap changer according to the change of 10KV bus voltage and reactive power. Gears and switching capacitors to achieve the purpose of regulating the 10KV bus voltage. The disadvantage of this method is that it only relies on the information of the substation where the reactive power and voltage integrated automatic control device is installed, and cannot be considered from the perspective of the entire regional power network; another method is to rely on the existing monitoring system of the local and county dispatching stations According to the voltage deviation of each node, the operator on duty wil...

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Problems solved by technology

The disadvantage of this method is that it only relies on the information of the substation where the integrated automatic control device for reactive power and voltage is installed, and it cannot be considered from the perspective of the entire regional power network; the other method is to rely on the existing monitoring system of the local and county dispatching stations According to the voltage deviation of each node, the operator on duty will issue an operation command to implement the on-load transformer tap changer gear adjustment and capacitor switching to achieve the purpose of adjusting the 10KV bus voltage

The disadvantage of this method is that it is impossible to adjust the transformer tap changer and capacitor switching operation in real time, and the on-duty personnel must always observe the voltage changes of each node of the power grid, which is labor-intensive and prone to errors

In addition, the above two methods do not solve the reasonable flow of reactive power in the power network, and cannot achieve the goal of minimizing the line loss of the power network

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