基于切换仿射系统的风电电压稳定控制  

The Voltage Stability Control in the Wind Power System Based on the Switched Affine System

作　　者：张明锐[1] 梅杰[1] 李元浩[2] 欧阳丽[2] 

机构地区：[1]同济大学电子与信息工程学院,上海201804 [2]上海电气集团股份有限公司中央研究院,上海200070

出　　处：《电工技术学报》2016年第3期171-179,共9页Transactions of China Electrotechnical Society

基　　金：国家科技支撑计划(2015BAG19B02);上海市自然科学基金(13ZR1444400);上海市科委资助项目(13DZ1200403)

摘　　要：为了提高基于固态变压器的永磁风电并网系统的电压稳定性,在低压直流侧通过双向DC-DC对超级电容器储能装置进行充放电管理。建立了基于Boost电路的切换仿射线性系统模型,根据Lyapunov稳定性分析法划分各子系统的运行区域,构造切换律,保证系统在任何情况下二次稳定。同时结合储能电路的充放电控制策略维持母线电压稳定,既减少了开关次数,又增强了系统的鲁棒性。仿真研究表明,在风速改变和电网电压跌落两种工况下,直流侧电压波动、超级电容器充放电电压和充放电电流均变小。该方案可以快速准确地抑制直流母线电压波动,改善并网风力发电机组的电能质量和稳定性。In order to improve the voltage stability of the grid-connected system based on the solid-state transformer, the super capacitor is controlled for c permanent magnet wind power harging and discharging through the bi-directional converter in the low voltage DC side. A switched affine linear system is modeled based on the Boost circuit in this paper. On the basis of the Lyapunov stability theorem, the operation areas of each subsystem are divided and the switching rules are designed to guarantee the quadratic stability of the system under any circumstance. By utilizing the charge-discharge strategy of the super capacitor, the bus bar voltage stability is maintained, the switch frequency is reduced, and the robustness of the system is enhanced effectively. The simulations demonstrate that the voltage fluctuation in the DC side, the charge-discharge voltage, and the current of the super capacitor decrease simultaneously under the conditions of wind speed change and grid voltage drop. The fluctuation of the DC-bus voltage can be suppressed rapidly and accurately under the proposed scheme, and the power quality and stability of the grid wind turbines can be improved effectively as well.

关 键 词：风力发电 电压稳定 DC-DC变换器 切换仿射线性系统 切换律 

分 类 号：TM712[电气工程—电力系统及自动化]