稳定边界及多目标约束下自同步电压源双馈风电机组参数整定

Parameter Tuning for Self-synchronous Voltage Source Doubly-fed Wind Turbines with Stability Boundary and Multi-objective Constraint

自同步电压源双馈风电机组采用“机侧惯量传递-网侧惯性同步”的控制方法,具备自主同步并网和惯量响应的能力,目前缺乏对该控制方法并网稳定性及多目标约束下参数优化设计的研究和分析。鉴于此,建立了同时考虑自同步电压源双馈风电系统网侧变换器和转子侧变换器动态的状态空间模型,分析了在不同电网强度下惯量传递环节及致稳环节的控制参数对中高频段小扰动稳定性的影响规律,给出了考虑机组不同工作点及动态性能的控制参数多目标优化模型,并采用粒子群优化算法对控制参数进行全局优化。在PSCAD/EMTDC中构建了2 MW双馈风电机组的仿真模型,仿真结果验证了理论分析和参数设计的正确性。

The self-synchronous voltage source doubly-fed wind turbines adopt the control method of“inertia transmission on the rotor side-inertia synchronization on the grid side”,which has the ability of autonomously synchronous grid-connection and inertia response.There is currently a lack of research and analysis on the grid-connected stability of this control method and optimal parameter design with multi-objective constraint.In view of this,a state-space model considering the dynamics of the grid-side converter and the rotor-side converter for the self-synchronous voltage source doubly-fed wind power system is constructed.Under different power grid intensities,the influence law of the control parameters of the inertia transfer link and the stabilization link on the small-signal stability in the middle and high frequency bands is analyzed.A multi-objective optimization model of control parameters considering different operation points and dynamic performances of the unit is given,and a global optimization of the control parameters is performed by using the particle swarm optimization algorithm.The simulation model of a 2 MW doubly-fed wind turbine is constructed in PSCAD/EMTDC,and the simulation results verify the correctness of the theoretical analysis and parameter design.