高速公路服务区微电网无源控制策略

Passivity-Based Control Strategy for Microgrids in Highway Service Areas

为减少高速公路服务区微电网在孤岛大负荷投切、运行模式切换等恶劣运行条件下母线电压和系统频率的波动,针对基于交流侧三相桥式变流器和直流侧半H桥变换器的储能装置变流器,设计基于非线性无源控制理论的控制策略。在交直流侧分别建立系统的端口受控哈密尔顿模型,并通过设定平衡点、求解能量匹配方程和阻尼注入,设计2个无源控制器分别追踪功率和控制电压,仿真结果验证了控制策略的有效性。相比传统控制策略,采用无源控制策略,一方面可减少系统控制参数,降低控制设计的复杂度;另一方面可降低交流侧功率和直流侧电压响应的超调量,减小动态调整时间,从而提升恶劣运行条件下微电网的稳定性。

To reduce the fluctuation of bus voltage and system frequency in microgrids of highway service areas under harsh operating conditions such as islanding and heavy load switching,and operating mode switching,a control strategy based on nonlinear passivity-based control theory is designed for energy storage device inverters based on three-phase bridge converter on the AC side and half H-bridge converters on the DC side.It establishes port controlled Hamiltonian models of the system on both the AC and DC sides,and designs two passivity-based controllers to track power and control voltage respectively by setting equilibrium points,solving energy matching equations,and damping injection.The simulation results verifies the effectiveness of the control strategy.Compared with traditional control strategies,it adopts passivity-based control strategies.Not only it reduces system control parameters and complexity of control design,but also does it reduce overshoot of AC side power and DC side voltage response.It reduces dynamic adjustment time,and thus improves the stability of microgrids under harsh operating conditions.