Voltage reactive power regulation method for coordinating transformer substation and power distribution network according to examination and evaluation result

Abstract

The invention relates to a voltage reactive power regulation method for coordinating a transformer substation and a power distribution network according to an examination and evaluation result. The method comprises the steps that firstly, whether the transformer substation and the power distribution network meet a preset examination requirement or not is judged according to voltage reactive power state information of the transformer substation and the power distribution network; then, a preset transformer substation and power distribution network coordinating and control strategy is executed according to the examination and evaluation result of the transformer substation and the power distribution network. According to the method, only voltage reactive power state information of part of equipment in the power distribution network is collected, the running state of the transformer substation and the running state of the power distribution network can be accurately judged through sensitivity calculation, corresponding control can be carried out, the data amount of real-time collection and operation is small, calculating speed is high, the mounting cost and running maintenance cost of collecting and control equipment are low, high practicality is achieved, and application and popularization are facilitated.

Description

technical field [0001] The invention relates to the technical field of coordinated control between power system substations and distribution networks, and more specifically, relates to a voltage and reactive power adjustment method for station distribution coordination based on assessment and evaluation results. Background technique [0002] At present, the control criterion of the voltage and reactive power control equipment installed in the terminal 110kV (or 35kV) substation of the power system and its lower-level distribution network is only independently controlled according to the real-time measurement data at the installation point. The taps of the main transformer in the substation The adjustment of the stalls is only judged based on the actual measured voltage on the outlet side of the substation. The switching of reactive power compensation equipment in the substation is only judged based on the reactive power (or power factor) on the inlet side of the substation. T...

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Problems solved by technology

[0006] 1) This method only reflects that when the low-voltage user exceeds the limit, the voltage and reactive power adjustment equipment of the substation, line and distribution transformer can be adjusted to improve the voltage of the low-voltage user, but it does not reflect how the substation voltage reactive power exceeds the limit and cannot be adjusted. How to improve the voltage and reactive power state of the substation by adjusting the voltage and reactive power equipment in the distribution network, and how to further reduce the network loss when the voltage and reactive power of the substation and the distribution network do not exceed the limit;

[0007] 2) This method first judges and adjusts the voltage state, and then judges and adjusts the reactive power state after the voltage adjustment is completed. However, in the actual power system, voltage and reactive power are coupled to each other and cannot be adjusted separately;

[0008] 3) This method requires real-time measurement of the low-voltage user voltage of the entire distribution network, the reactive power state of the distribution transformer voltage, the voltage regulator voltage, the reactive power state of the main transformer voltage, and the voltage reactive power control equipment status of the substation, line and all distribution transformers Information, for the distribution network, the installation quantity of its measurement devices and control devices is quite large, which brings relatively large installation costs and operation and maintenance costs, and is not generally applicable to the actual large-scale distribution network

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