Auxiliary frequency modulation system based on new energy power generation technology of power plant

Abstract

The invention discloses an auxiliary frequency modulation system based on a power plant new energy power generation technology, which comprises a 220kV high-voltage bus, a main transformer, a distributed control system (DCS), a remote terminal unit (RTU), a power measuring device, a generator, a high-voltage station transformer, a 6kV station power bus, a boosting transformer, new energy power generation equipment and a new energy control system. A coal-fired generator is connected with a main transformer and a high-voltage plant transformer through a power measuring device, the main transformer is connected with a 220kV high-voltage bus through a first switch, the high-voltage plant transformer is connected with a 6kV plant power bus through a second switch, and the 6kV plant power bus is connected with the high-voltage side of a boosting transformer through a third switch. The low-voltage side of the boosting transformer is connected with the new energy power generation equipment; the distributed control system DCS and the new energy control system establish communication connection to participate in unit AGC, the AGC instruction response speed of a power plant is effectively improved, unit frequency modulation is assisted, the requirement of a power grid assessment index is met, and the economic efficiency of a power generation enterprise is improved.

Description

technical field [0001] The invention belongs to the field of frequency regulation of power plant units, and in particular relates to an auxiliary frequency regulation system based on new energy power generation technology of power plants. Background technique [0002] With the increasing proportion of new energy, the pressure of wind power consumption will continue to increase, and the large-scale grid connection of wind power will significantly increase the AGC frequency regulation demand of the power grid. In addition, a large number of thermal power units undertake heavy AGC regulation tasks for a long time, resulting in a series of negative effects such as increased coal consumption for power generation and serious equipment wear and tear. Existing power frequency regulation resources can no longer meet the needs of large-scale grid-connected renewable energy. With economic development and the increase in the complexity of the power grid, this contradiction will become m...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an auxiliary frequency regulation system based on the new energy power generation technology of the power plant in view of the fact that the new energy power generation equipment connected to the existing power plant cannot participate in the AGC of the unit and cannot help the unit to improve the frequency regulation performance. The system has a simple structure , the transformation operation and maintenance cost is low, and the new energy power generation equipment can participate in AGC together with the generator set, which greatly improves the response speed of the power plant to the AGC command, meets the requirements of the power grid assessment index, and increases the economic benefits of the power generation enterprise

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