Sequential Coordinated Control Method for Reactive Power and Voltage of Large-scale Photovoltaic Power Plant

Abstract

The invention discloses a large-scale photovoltaic power station reactive voltage sequential coordination control technology, and belongs to the technical field of automation of a power system. Reactive voltage triple regulation and control systems are established according to priorities, the previous two reactive adjustment systems, based on voltages of the output end of each photovoltaic generating unit, regulate and control output reactive power, including a reactive investment capability of each photovoltaic generating unit and coupling reactive investment capabilities between the generating units, so as to stablize voltages of each unit end and realize an equalization state, and the third reactive adjustment system, based on a static var generator (SVG), makes up a deficiency of reactive output of a photovoltaic power station itself. According to the invention, voltage level of a grid-connected point can be improved, consistency of end voltages of each photovoltaic generating unit is maintained, the capability of resisting external interference is enhanced, the safety and stability of network operation of a large-scale concentrated photovoltaic power station are improved, and at the same time, investment of the SVG is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric power system automation, and in particular the invention relates to a sequential coordinated control method for reactive power and voltage of a large-scale photovoltaic power station. Background technique [0002] With the lower and lower cost of photovoltaic power generation and the improvement of power generation efficiency, solar energy resources have been effectively utilized in Northwest my country. Concentrated photovoltaic power plants, as a renewable new energy with bright commercial prospects, have received more and more attention. Compared with thermal power plants with the same power generation capacity, the photovoltaic power plant power generation system saves a lot of cost resources and reduces carbon dioxide emissions. There has been an upsurge in the research of photovoltaic power stations at home and abroad. In China, in 2004, Shenzhen Garden Expo Park established my country's f...

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Problems solved by technology

Most of the research points at this stage focus on the following: 1) only regard the photovoltaic power generation system as an independent power source, without considering the line parameters and the power coupling effect between photovoltaic units; 2) most of them only add wireless power from outside The power compensation equipment does not consider the reactive power adjustment capability of the photovoltaic power station itself and the reactive power coordination control strategy of the two

3) For the problem of reactive power, the voltage of the grid-connected point is almost always used as the adjustment target, and the influence of the voltage fluctuation of the grid-connected inverter terminal in the photovoltaic power station system on the grid-connected system is not considered

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