基于钒电池储能系统的风电场并网功率平抑控制

doi:10.11930/j.issn.1004-9649.2013.8.48.5

摘要/Abstract

摘要： 为平抑风电场输出功率波动,选择在风电场并网母线位置配置钒电池储能系统。采用双向AC/DC变流器作为钒电池储能系统的功率调节器并推导出其在d-q坐标系下的暂态数学模型。针对此数学模型强耦合、非线性等不利于控制器设计的特点,采用状态反馈精确线性化方法,将其转化为线性形式,再采用变结构原理中的变指数趋近律方法设计系统的闭环控制器。仿真结果表明,当风速快速变化时,钒电池储能系统能够通过快速充放电平抑风电场输出波动;而且与PI控制相比,变结构控制可使系统的动态性能更好。此外,钒电池储能系统具有有功和无功功率可以独立调节的特点,可实现风电功率的解耦控制。

关键词: 风电并网, 储能, 钒电池, 功率控制, 变结构控制

Abstract: In order to smooth the output of wind farms, a vanadium redox flow battery (VRB) based energy storage system (ESS) is equipped at the grid bus, in which a bi-directional AC/DC converter is used as the power regulator with the transient mathematic model derived in the synchronous rotating d-q coordinate system. Considering the characteristics of strong coupling and nonlinearity of the mathematic model, the linear transformation is conducted on the model with the state feedback exact linearization method. Then, the variable exponent reaching law of the variable structure control is used to design the close-loop controllers of the linear system. The simulation results indicate that the VRB-based energy storage system can smooth the fluctuation of wind farm outputs through fast charge and discharge process when the wind speed changes rapidly. And compared with the PI control, the variable structure controller shows better dynamic performance. In addition, the independent adjustability of active and reactive power of the VRB-based energy storage system can decouple the wind power control.

Key words: wind power integration, energy storage, vanadium redox flow battery (VRB), power control, variable structure control

中图分类号:

TM614

刘向向, 王奔, 张翔, 马明智. 基于钒电池储能系统的风电场并网功率平抑控制[J]. 中国电力, 2013, 46(8): 48-53.

LIU Xiang-xiang, WANG Ben, ZHANG Xiang, MA Ming-zhi. Smoothing Control of Grid-Connected Wind Power by VRB-Based Energy Storage Systems[J]. Electric Power, 2013, 46(8): 48-53.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.2013.8.48.5

https://www.electricpower.com.cn/CN/Y2013/V46/I8/48

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