关键词: 超导储能, 电压源型功率调节系统, 非线性变换, 线性化, 解耦控制

Abstract: This paper chooses the voltage source converter based PCS as the object to study the method of its modeling and control. The structure of PCS, which includes the topologies of VSC and DC-DC chopper, was presented firstly, followed by the deduction of the low frequency state equation expressed by duty cycle. Then the state equation was linearized by non-linear transformation, the result of which was based to design the control system that achieves decoupled control between active power, reactive power and DC voltage. Finally, the ability of PCS to track power orders in the form of step change or sine change and the effectiveness of SMES system to stabilize output power of generator in single machine infinite bus system were checked using Matlab/Simulink software. The results of simulation show that PCS designed in this paper has the ability to trace power order in form of sine and step, accompanied by the strong resistance of DC voltage to disturbance, the SMES system interfaced by this PCS can accelerate the calm down of generator power oscillation, so enhance the stability of power system.

Key words: SMES, VSC-based power conditioning system, non-linear transformation, linearization, decoupled control