Primary frequency regulation system and control method of energy storage hydraulic type wind power generating set

Abstract

The invention discloses a primary frequency regulation system of an energy-storage hydraulic-type wind generating set and a control method. The primary frequency regulation system comprises a wind wheel, couplers, a fixed displacement pump, a motor, a proportional throttle valve, overflow valves, a one-way valve, a hydraulic oil tank, a variable displacement motor, a hydraulic accumulator subsystem, a safety valve set of the hydraulic accumulator subsystem, an excitation synchronous generator, a grid-connected cabinet, a primary frequency regulation controller, a pressure sensor, a flow sensor, a rotating speed torque sensor and a hydraulic pipe. The control method includes the steps that in the unit operation process, for instant dynamic fluctuation of power network frequency, dynamic balance of the output frequency of the hydraulic-type wind generating set is achieved through a hydraulic motor energy-storage subsystem. According to the primary frequency regulation system of the energy-storage hydraulic-type wind generating set and the control method, in the unit operation process, compared with inertia energy storage of a wind machine, the hydraulic accumulator subsystem stores more energy, bears power network frequency fluctuation with the larger range, and furthest keeps unit-grid-connection stable operation.

Description

technical field [0001] The invention belongs to the new energy technical field of wind power generation, and in particular relates to a primary frequency regulation system and a control method of an energy storage hydraulic type wind power generating set. Background technique [0002] In recent years, under the background of vigorously developing green energy, the penetration rate of wind power generation (the percentage of wind power in regional power grid power) in China has been continuously increasing, and wind power has become an important part of my country's power system. However, affected by climatic conditions, the output power of wind power generation has the characteristics of intermittent and randomness. The integration of large-scale wind power generation poses new challenges to power system planning, operation control, protection, dispatching, etc., especially in active power control. There are still some problems that need to be solved urgently. Large-scale wi...

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Problems solved by technology

However, the traditional energy storage system, no matter it is configured at the wind turbine level or at the wind farm level, only relies on energy storage to undertake the active power control and frequency modulation needs of the wind farm, which will inevitably lead to large energy storage capacity configuration, high cost and economic benefits. bad question

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