Wind farm power control method and system based on energy storage inverter
An energy storage inverter and power control technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve the problem of limited smoothing ability of wind farm power fluctuation, poor output power effect, virtual synchronous generator operation Unstable and other problems, to avoid serious fluctuations in mechanical power, stable operation, and eliminate the interference of output current
Active Publication Date: 2018-12-14
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology
[0009] The purpose of the present invention is to provide a wind farm power control method and system based on an energy storage inverter, which is used to solve the poor effect of smoothing the output power of the wind farm by introducing a virtual synchronous generator in the prior art, and the smoothing ability of the wind farm power fluctuation is limited problem, and the problem that the virtual synchronous generator is not running smoothly
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[0059] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0060] Such as Figure 4 The shown wind farm power control system based on energy storage inverters includes energy storage inverters, which include sequentially connected energy storage batteries, inverters and LCL filters, and LCL filters are used to connect wind power The PCC (Common Connection Point) between the field and the grid also includes a control module and a PWM module. The control module is connected to the PWM module, and the PWM module is connected to the control terminal of the inverter. The control module is used to control the PWM module to output PWM waves. The wave acts on the inverter to make it output a corresponding voltage, which acts on the LCL filter (hereinafter referred to as the filter), and generates the desired target command current on the filter. Among them, the control module is used to execute instruction...
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The invention relates to a wind farm power control method and system based on an energy storage inverter, belongs to the field of wind power generation control, an instantaneous reactive power theoryis used to calculate a power smoothing command current, the power smoothing command current is utilized to smooth the power fluctuation of the wind farm, at the same time, the mathematical model of the current control type virtual synchronous generator is established, and the stator current of the virtual synchronous generator is calculated, the energy storage inverter has the characteristics of avirtual synchronous generator, the power fluctuation smoothing function of the wind farm corresponding to the power smoothing instruction current does not affect the operation of the virtual synchronous generator, the problem of serious mechanical power fluctuation of the virtual synchronous generator is avoided, and the operation state of the virtual synchronous generator is stable. The wind farm power control method of the invention not only realizes the fast smoothing of power fluctuation of the wind farm, but also ensures the stable operation of the virtual synchronous generator.
Description
technical field [0001] The invention belongs to the field of wind power generation control, and in particular relates to a wind farm power control method and system based on an energy storage inverter. Background technique [0002] In recent years, wind power generation has developed rapidly. Due to the influence of natural conditions, the active output of wind farms fluctuates greatly, which has a serious impact on the power grid. In order to reduce the impact, energy storage inverters (that is, energy storage battery systems, including energy storage batteries, inverters and filters) are usually used to smooth the output of wind farms. For example, the Chinese patent application with publication number CN102738817A proposed " The method of self-adaptive smoothing of wind power by using the battery energy storage system” and so on. These smoothing methods can to a certain extent stabilize the fluctuation of wind power grid-connected power and reduce the impact of wind farms...
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Patent Timeline
Login to View More IPC IPC(8): H02J3/38H02J3/46H02J3/32H02J3/24
CPCH02J3/24H02J3/32H02J3/386H02J3/46H02J2203/20Y02E10/76
Inventor 张鸿博蔡晓峰王文星李雪
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER