不对称电压跌落下逆变电源的多目标控制策略

发布时间：2018-08-14 19:42

【摘要】：当电网发生不对称电压跌落时,需要对分布式逆变电源进行故障下的穿越控制,保证其能够继续向电网输送功率而不退出运行。提出一种新型的适用于分布式逆变电源接口逆变器的多目标控制策略,旨在满足多样化的故障穿越需求。首先,提出并推导一种新型的统一电流参考计算表达式,通过引入参数k_1和k_2来实现对多个目标的控制。然后,推导一种最优波动功率幅值的搜索路径用来实现对参数k_1和k_2的优化选择。通过简化最优搜索路径,得到了另一种线性的搜索路径,该路径可以近似代替优化路径并削减控制的复杂度。接着,根据控制目标在搜索路径上的单调性,设计了一种定功率波动幅值以及自适应的电流不平衡度限制的控制策略。最后,通过仿真算例验证了所提控制策略的有效性和灵活性。
[Abstract]:When the asymmetric voltage drop occurs in the power network, it is necessary to control the fault traversing of the distributed inverter power supply to ensure that it can continue to transmit power to the power grid without withdrawing from operation. A new multi-objective control strategy for distributed inverter is proposed, which is designed to meet the needs of a variety of fault traversing. Firstly, a new unified current reference expression is proposed and deduced. The control of multiple targets can be realized by introducing the parameters KS _ 1 and KS _ 2. Then, a search path of the optimal fluctuating power amplitude is derived to realize the optimal selection of the parameters k _ s _ 1 and k _ s _ 2. By simplifying the optimal search path, another linear search path is obtained, which can approximately replace the optimized path and reduce the complexity of control. Then, according to the monotonicity of the control target in the search path, a control strategy of constant power fluctuation amplitude and adaptive current imbalance is designed. Finally, the effectiveness and flexibility of the proposed control strategy are verified by a simulation example.
【作者单位】：北京交通大学电气工程学院;北京京能清洁能源电力股份有限公司;北京科锐博润电力电子有限公司;
【基金】：北京市科技计划课题资助项目(D131104002013003)
【分类号】：TM464

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