A method for detecting reactive power capacity of new energy power stations connected to weak power grids

Abstract

The invention provides a method for detecting reactive power capacity of a new energy power station connected to a weak power grid, comprising the following steps: determining the reactive capacity detection object of the new energy power station; detecting the reactive capacity of a wind turbine converter / photovoltaic grid-connected inverter ; Detect the reactive power capacity of the reactive power compensation device of the new energy power station; determine the reactive power capacity of the new energy power station. The invention detects the reactive power capacity of the reactive power compensation device of the new energy power station and the wind turbine converter / photovoltaic grid-connected inverter within the allowable voltage operation range (grid dispatching requirements or historical data), so as to ensure that effective field monitoring is carried out according to relevant standards. Station reactive capacity detection. By adjusting the operation mode of different types of reactive power sources in new energy power plants, the effective detection of reactive power capacity of new energy power plants in areas with weak grid structures is realized. It provides a practical and feasible method for detecting reactive power capacity of new energy power stations for power system dispatching agencies, wind farm operators and related testing agencies.

Description

technical field [0001] The invention belongs to the technical field of new energy access and control, and in particular relates to a reactive capacity detection method of a new energy power station connected to a weak power grid. Background technique [0002] According to the requirements of China's energy development strategic action plan, by 2020, the proportion of non-fossil energy in my country's primary energy consumption will reach 15%, and the proportion of renewable energy consumption such as wind power, solar energy, and geothermal energy will be greatly increased. As my country's wind power / photovoltaic and other new energy installed capacity accounts for an increasing proportion of the power grid, the impact of wind power / photovoltaic grid-connected operation of new energy power stations on the power grid will become more and more obvious. The stability and adjustability of voltage are related to the safe and stable operation of the power grid, so it is particularl...

AI Technical Summary

Problems solved by technology

[0003] Through on-site research and actual testing, it is found that there are problems in the reactive capacity detection process of new energy power plants in my country, and it is difficult to effectively complete the detection task

[0004] Since new energy power plants are mostly at the end of the power grid, the voltage fluctuates greatly. In order to make the voltage of the grid-connected point (output convergence point) operate within a reasonable range (required by the power system dispatching organization), it often leads to the inability to effectively detect reactive power capacity.

For example, when all reactive power sources of a new energy power station are not working, the operating voltage of the grid-connected point can be as high as 40kV; In this state, it is difficult to effectively detect the capacity of reactive power according to the traditional AVC control method.

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