Three-phase medium-low voltage integrated power distribution network voltage control method and system

Abstract

The invention provides a three-phase medium-low voltage integrated power distribution network voltage control method and system. The method comprises the steps of: reading original data of a power distribution network, establishing an uncertainty probability model of output and load of a distributed power supply, performing initial probabilistic load flow calculation by utilizing a two-point estimation method to obtain statistical data of the node voltage and the objective function of each phase, determining whether a voltage out-of-limit problem occurs in medium-voltage and low-voltage regions or not, and if not, returning to enter the next control period; otherwise, on the basis of probabilistic load flow calculation, establishing the three-phase voltage control model of the medium-low voltage integrated power distribution network, performing solving by using a genetic algorithm to obtain a regulation and control value of each control variable, and further controlling the medium-lowvoltage integrated power distribution network. The active control capability of the low-voltage power distribution network is fully utilized, the low-voltage power distribution network is coordinatedand controlled with the medium-voltage power distribution network to solve the problem that an original low-voltage power distribution network is passively controlled by the medium-voltage power distribution network, and the operation efficiency and the operation safety of the power distribution network are improved.

Description

technical field [0001] The present disclosure relates to the technical field of distribution network automation, in particular to a voltage control method and system for a three-phase, medium and low voltage integrated distribution network. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] In recent years, with the continuous development of the power industry, the power system is gradually developing towards digitalization, intelligence and automation. Compared with power generation, transmission and other links, my country's power distribution and power consumption have always been the weak links of the entire power system, seriously affecting the overall performance and efficiency of the system. Due to the lack of information interaction between the traditional medium and low voltage distribution networks, and the medium voltage 10kV an...

AI Technical Summary

Problems solved by technology

However, there are still a series of problems in the emergence of the above power distribution forms: (1) There is no effective medium and low voltage integrated control model established, and the flexible operation control strategy is missing; (2) The access of distributed power makes a single network load characteristics developed into complex network source load characteristics

However, with the access of distributed power, especially the continuous integration of distributed power into the low-voltage distribution network through inverters, traditional reactive power compensation equipment is no longer sufficient to deal with the randomness and volatility brought about by the access of distributed power. The problem is that frequent switching of equipment increases the cost of operation and control, and at the same time causes the loss of equipment life

Moreover, the above reactive power compensation equipment is rarely equipped in the low-voltage distribution network, which makes it difficult to carry out unified control on the medium- and low-voltage distribution network

At the same time, the three-phase unbalance problem of distribution network operation and the uncertainty of load and distributed power output also bring certain challenges to the operation control of medium and low voltage integrated distribution network.

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