Multi-power-supply reactive power cooperation method and system for optimizing voltage control capability of photovoltaic power station

Abstract

The invention discloses a multi-power-supply reactive power cooperation method and system for optimizing the voltage control capability of a photovoltaic power station. The method comprises the stepsof determining a topological structure of the photovoltaic power station, and classifying the nodes according to the node type of each node in the topological structure so as to obtain a plurality ofnode sets; for the nodes in each node set, respectively determining the equality constraint conditions based on reactive power of an alternating current line; determining an equality constraint condition based on active power and voltage of a photovoltaic electric field grid-connected point; determining the upper and lower limit constraint conditions of each node voltage in the photovoltaic powerstation and the upper and lower limit constraint conditions of the reactive power of each power generation unit respectively according to the operation requirements of a photovoltaic inverter and a reactive power compensation device SVG; and determining an objective function of multi-power-supply optimal reactive power output in the photovoltaic power station, and determining the reactive power output of each photovoltaic inverter and SVG. According to the invention, the active loss of the SVG and the active network loss of the power transmission line in the photovoltaic power station can be reduced, and the reactive voltage coordination control capability of a new energy station is improved.

Description

technical field [0001] The invention relates to the field of metering and calibration, and more specifically, relates to a multi-power source reactive power coordination method and system for optimizing the voltage control capability of a photovoltaic power station. Background technique [0002] As of the end of 2018, my country's installed capacity of renewable energy power generation reached 728 million kilowatts, a year-on-year increase of 12%. Year-on-year increases of 2.5%, 12.4%, 34% and 20.7%. The installed capacity of renewable energy power generation accounted for about 38.3% of the total installed capacity of electricity, a year-on-year increase of 1.7 percentage points, and the role of renewable energy as a clean energy substitute has become increasingly prominent. At present, the reactive power compensation device (StaticVarGenerator, SVG) occupies a large part of the power consumption in the photovoltaic power station. When the reactive power output of the react...

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Problems solved by technology

[0004] The present invention proposes a multi-power supply reactive power coordination method and system that optimizes the voltage control capability of photovoltaic power plants to solve the problem of how to adjust the reactive power output of photovoltaic inverters and SVGs

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