基于李雅普诺夫稳定性理论的VSC-HVDC系统非线性控制策略研究

2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies Pub Date : 2008-04-06 DOI:10.1109/DRPT.2008.4523773

Guangkai Li, Guopeng Ma, Chengyong Zhao, Gengyin Li

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引用次数: 14

摘要

提出了一种基于李雅普诺夫稳定性理论的非线性控制策略，以满足不确定条件外部干扰下的稳定性要求。由于直流直流直流电压微分方程的非线性，将直流电压的控制转化为对交流电流基元q轴分量的控制。根据参考值与实际值的差异，采用合适的李雅普诺夫函数。基于李雅普诺夫稳定性判据，得到了变换器的两个非线性控制输入。由于有功功率微分方程的线性性，传统的有功功率控制方法采用比例积分法。在PSCAD/EMTDC上的仿真结果验证了该控制策略在VSC- HVDC两端交流系统单相接地短时间(0.05s)故障下的可行性。

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Research of nonlinear control strategy for VSC-HVDC system based on Lyapunov stability theory

A nonlinear control strategy based on Lyapunov stability theory is proposed to satisfy stability requirements under the external interference of the uncertainty condition. Due to the nonlinear of the DC voltage differential equation for VSC-HVDC, the control of DC voltage is transformed to the control of the q-axis component of AC current fundamental component. Suitable Lyapunov functions are adopted according to the difference between reference value and actual value. Two nonlinear control inputs to the converter are obtained based on Lyapunov stability criterion. Due to linear of active power differential equation, active power is controlled based on traditional proportional integral (PI). The simulation results performed on PSCAD/EMTDC verify the feasibility of the control strategies effectively under a short time (0.05s) single phase to ground fault in two terminal AC systems of VSC- HVDC.

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2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies

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