Transmission and distribution cooperative automatic voltage control method considering voltage regulation demand of power distribution network

Abstract

The invention provides a transmission and distribution cooperative automatic voltage control method considering the voltage regulation demand of a power distribution network. The method comprises the following steps: acquiring a transmission and distribution network model and real-time data to construct a transmission and distribution integrated power grid model; for all load node voltages of feeder lines under 10kV buses of the transformer substation, judging whether the load node voltages are out of limit or not, calculating the rate that the load node voltages are close to or out of the upper limit and the rate that the load node voltages are close to or out of the lower limit under the feeder lines; if the load node voltage approaching or exceeding the upper limit rate under a certain feeder line is greater than the threshold value approaching or exceeding the upper limit rate, updating the voltage upper limit of the corresponding 10kV bus; if the load node voltage under a certain feeder line is close to or out of the lower limit rate and is larger than the threshold value close to or out of the lower limit rate, updating the corresponding 10kV bus voltage lower limit; if the voltage of the 10kV bus exceeds the upper limit, downshifting the tap of the substation where the 10kV bus is located or switching the capacitive reactance device; and if the voltage of the 10kV bus exceeds the lower limit, selecting the tap of the transformer substation where the 10kV bus is located to upshift or the capacitive reactance device is switched.

Description

technical field [0001] The invention relates to the field of electric power, in particular to an automatic voltage control method for transmission and distribution coordination considering the voltage regulation requirements of a distribution network. Background technique [0002] Automatic voltage control (hereinafter referred to as AVC, Automatic Voltage Control) system is an important means to achieve safe (improved voltage stability margin), economical (reduced network loss), and high-quality (improved voltage qualification rate) operation of the transmission network. The AVC system architecture is based on the grid energy management system (EMS), which can use the real-time operation data of the transmission grid to scientifically make the best reactive power and voltage adjustment scheme from the perspective of overall optimization of the transmission grid, and automatically send it to power plants, substations and subordinates The power grid dispatching organization e...

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Problems solved by technology

[0003] In the power system, the distribution network is at the end of the entire system, and its voltage quality is directly related to whether the user's electrical equipment can run stably. When the system provides a voltage lower than the rated voltage of the user's electrical equipment, the user's electrical equipment will not operate normally. On the contrary, when the voltage provided by the system is higher than the rated voltage of the user's electrical equipment, the service life of the user's electrical equipment will be shortened, and even the electrical equipment will be damaged.

The main causes of distribution network voltage problems are small line cross-sectional area, large power supply radius, insufficient reactive power compensation configuration capacity, aging equipment, etc., and the voltage regulation method is to install a single reactive power compensation device on the line. Unified control and high cost, the effect of voltage control is not obvious

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