Method for participating in dynamic voltage control of electric system through photovoltaic power generation cluster

Abstract

The invention relates to a method for participating in dynamic voltage control of an electric system through a photovoltaic power generation cluster, and belongs to the technical field of electric system operation and control. The method comprises the steps that a photovoltaic cluster PI control framework is built; a cluster coordination layer measures voltage and active and reactive power of a grid connection point to complete external equivalent recognition, and a photovoltaic cluster output reactive power reference value is generated; on the basis of a tide linearization method, a reactive power output distribution model of each photovoltaic power generation unit is built, and reactive power output of each unit is calculated. According to the method, the reactive compensation capability of a power generation unit inverter is utilized, on the basis of wide area PI control, dynamic voltage indifference regulation of the whole photovoltaic cluster is achieved, and reasonable distribution of reactive power of the power generation units is achieved. According to the method, the photovoltaic cluster has the advantage of showing the whole voltage dynamic indifference regulation on a system, reactive power output of each power generation unit is reasonably arranged, and the dynamic characteristic of voltage control is improved.

Description

technical field [0001] The invention relates to a method for a photovoltaic power generation cluster to participate in dynamic voltage control of a power system, belonging to the technical field of power system operation and control. Background technique [0002] With the rapid development of human society, the demand for energy has also shown explosive growth. However, the excessive consumption of traditional energy and its damage to the environment force people to seek alternative forms of clean and renewable energy such as solar energy. Photovoltaic power generation has developed rapidly in recent years, and the installed capacity of photovoltaic power generation in the world has grown rapidly. Due to the geographical imbalance of supply and demand resources in my country, large-scale photovoltaic grid-connection is not to achieve local consumption, but to transport from low-load areas to distant places with heavier loads. developed areas. A photovoltaic cluster can be a...

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Problems solved by technology

However, most of the existing inverter control strategies are relatively rigid control methods such as constant power, constant power factor, and droop control, which do not fully consider the cooperation of each power generation unit within the cluster, and the real-time voltage tracking ability is also poor. It is not flexible enough to fully mobilize the reactive power adjustment capability of each photovoltaic power generation unit, and is not suitable for the fast and stable requirements of dynamic voltage regulation in actual use

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