海上风电VSC-HVDC系统的直接功率控制  被引量:15

Direct Power Control of VSC-HVDC System for Offshore Wind Farms

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作  者:罗德荣[1] 姬小豪 廖武[1] 宋辉[1] 

机构地区:[1]湖南大学国家电能变换与控制工程技术研究中心,长沙410082

出  处:《电力系统及其自动化学报》2016年第6期43-48,共6页Proceedings of the CSU-EPSA

基  金:国家国际科技合作项目(2011DFA62240)

摘  要:为了解决传统直接功率控制存在开关频率不恒定问题,该文提出了一种适用于海上风电场并网的电压源型高压直流输电系统的改进直接功率控制。该方法在推导电压源型高压直流输电系统αβ坐标系下离散化数学模型的基础上,结合虚拟磁链定向、瞬时功率理论和空间矢量脉冲宽度调制,针对电压源型高压直流输电系统设计了相关的离散化控制器。风电场侧采用定有功功率和无功功率,电网侧采用定直流电压和无功功率,实现直流电压稳定以及有功、无功功率的解耦。在Matlab/Simulink构建的离散模型基础上,对有功、无功等工况进行了仿真分析。仿真结果验证了该方法的有效性和可行性,为海上风电场电压源型高压直流输电系统提供一种可行的控制方案。A novel direct power control strategy in the voltage sourced converter based high voltage direct current sys-tem for offshore wind farms is proposed in the paper. The discrete mathematical model VSC-HVDC system in αβ refer-ence frame is derived and discrete controllers are designed for voltage sourced converter based high voltage direct cur-rent system which is based on virtual flux oriented,instantaneous power theory and space vector pulse width modula-tion. Constant active and reactive power controller is used in the wind farm side;a constant DC voltage and constant re-active power controller is used in the grid-side to achieve a stable DC voltage and active and reactive power decoupling.According to the discretely steady mathematical model of the converter which is set up in Matlab/Simulink software,steady-state and dynamic performance of the proposed controllers under different operation conditions are shown,andthe results show the feasibility and effectiveness of the proposed control methods which provide a viable solution in volt-age sourced converter based high voltage direct current systems for offshore wind farm.

关 键 词:海上风电场 电压源型高压直流输电 直接功率控制 虚拟磁链 空间矢量脉冲宽度调制 

分 类 号:TM712[电气工程—电力系统及自动化]

 

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