Central point voltage regulation method and system of distribution network based on distributed photovoltaic power generation system

Abstract

The invention discloses a distribution network pivot point voltage regulation method and system based on a distributed photovoltaic power generation system. The voltage regulating method comprises thefollowing steps of: collecting the bus voltage of 380V of the distribution network of the distributed photovoltaic power generation system in real time; When the bus voltage of 380V is greater than the voltage threshold, the timing is started; and when the bus voltage of 380V is greater than the voltage threshold, the timing is started. Obtaining the current season when the timing time is greaterthan the time threshold; Acquiring a reactor within a corresponding preset capacity range according to the current season; Shunt reactor on the 10 kV bus at the central point; Judging whether the reduced 380V bus voltage acquired in real time exceeds the limit; When the reduced 380V bus voltage exceeds the limit, the reactor parameters are adjusted until the reduced 380V bus voltage does not exceed the limit. Stop regulating the bus voltage of 380V. Under the fluctuation of the photovoltaic output of the distributed photovoltaic power generation system, the voltage regulation method of the invention adopts an active distribution network power flow calculation method to analyze the bus overvoltage situation of the distribution network, and finally realizes the dynamic regulation of the busvoltage of the central point.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a method and system for voltage regulation at a central point of a distribution network based on fluctuations in photovoltaic power generation. Background technique [0002] The basic equipment of the existing distributed photovoltaic power generation system is mainly composed of photovoltaic cell modules, grid-connected inverters and other equipment, and the wiring is directly connected to the user side. The above-mentioned distributed photovoltaic power generation system is usually used by the user through photovoltaic power generation. The operation mode of grid connection to obtain income. [0003] However, with the rapid development of distributed photovoltaic power generation, the problem that the high penetration rate of photovoltaic power generation causes the voltage limit of the distribution network cannot be ignored. At present, scholars generall...

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Problems solved by technology

Among them, the photovoltaic inverter control has limited ability to regulate the voltage exceeding the limit, and it is difficult to adopt a unified manufacturer for photovoltaic inverters, and it is difficult to make unified deployment; adding energy storage devices can adjust the voltage exceeding the limit to a certain extent, but it is bound to increase cost; and in view of the status quo of the equipment in the domestic distribution network, only a small number of adjustable transformer taps are equipped, and the adjustment range and flexibility are very poor

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