Distributed voltage coordination control method and system for power distribution network

Abstract

An embodiment of the invention discloses a distributed voltage coordination control method and system for a power distribution network . The method comprises the steps of: acquiring prediction information related to a power distribution network, wherein the prediction information at least comprises a daily load prediction curve of the power distribution network, a distributed power supply output prediction curve, and electric load demand information of the power distribution network; carryinig out processing based on the prediction information to obtain a prediction result, wherein the prediction result at least comprises the daily net load of the power distribution network and a voltage out-of-range time period of the power distribution network; screening a coordination control scheme based on the prediction result and a random prediction control model; storing the coordination control scheme, issuing a coordination control instruction of the coordination control scheme to each virtual soft controller, and performing remote or local regulation and control operation on the corresponding reactive power source; and analyzing the power distribution network executing the coordination control instruction to determine whether the voltage of the power distribution network is out of range, and repeating the above steps.

Description

technical field [0001] The present application relates to the technical field of electric power systems, in particular to a distributed voltage coordinated control method and system for distribution networks. Background technique [0002] The power output of intermittent distributed power sources such as photovoltaics and wind power is affected by natural conditions and meteorological conditions, and has strong volatility and randomness. At the same time, because the R / X ratio of the distribution network is significantly different from that of the transmission network, the relationship between the voltage and active and reactive power of the distribution network is not as approximately decoupled as the transmission network. Therefore, a high proportion of intermittent new energy The fluctuation of output power and the random change of load demand will lead to aggravated voltage fluctuation at the end of distribution network, which seriously affects the reliability of power s...

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Problems solved by technology

At the same time, because the R / X ratio of the distribution network is significantly different from that of the transmission network, the relationship between the voltage and active and reactive power of the distribution network is not as approximately decoupled as the transmission network. Therefore, a high proportion of intermittent new energy The fluctuation of output power and the random change of load demand will lead to aggravated voltage fluctuation at the end of the distribution network, seriously affecting the reliability of power supply of the distribution network

[0003] At present, the existing research directions are mainly the following two points: First, the application of automatic voltage control (AVC) can suppress the voltage fluctuation of the grid-connected point by changing the reactive output of the distributed power grid-connected inverter. However, the distributed power The output reactive power is limited by the capacity of the inverter. When the external environment changes greatly, it is often difficult to solve the problem of large voltage fluctuation amplitude. Second, some existing control methods introduce auxiliary control of the battery energy storage system ( Battery energy storage control, BESC) to make up for this defect, and achieved certain results, but still has certain limitations: first, the control effect of this type of method is limited by the capacity of the battery energy storage system, due to the lack of current technology, The cost of the battery energy storage system is still high, and the power output of the distributed power supply has random uncertainty, which will lead to frequent charging and discharging of the battery energy storage system and accelerate the aging process of the battery

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