延时影响下智能软开关控制器硬件在环测试准确性分析

Accuracy analysis of controller hardware-in-the-loop test for soft open point considering the influence of delay

智能软开关作为一种实现配电网灵活调节作用的电力电子设备,通常采用控制器硬件在环技术以实现多样化的功能验证需求。控制器硬件在环中存在不可忽略的接口延时环节,影响暂态稳定性测试的功角动态准确性,造成试验结果与真实系统响应不一致。设计了智能软开关控制器硬件在环测试系统,建立了测试系统的时域数学模型,解析延时环节对测试准确性影响。基于暂态稳定等面积方法量化延时影响程度,综合考虑测试系统的准确性和规模,探究了延时环节参数的优化选择和设计。最后,基于RT-LAB实时仿真器的控制器硬件在环测试系统验证了理论分析的正确性。

The soft open point is a power electronic device that can realize the flexible adjustment of the distribution network.It usually adopts the controller hardware-in-the-loop platform technology to achieve diversified functional verification requirements.However,the inherent interface delay of controller hardware-in-the-loop will reduce the power angle dynamic accuracy of the transient stability test,which causes the test results are different with the actual system response.In this paper,the controller hardware-in-the-loop test system of soft open point is designed firstly,a time-domain mathematical model of the test system is established,and the influence of the delay process on the accuracy of the system transient stability test is analyzed.Then,the transient stability-based equal area criterion is used to quantify the influence of the delay on the accuracy of the simulation system.Based on the accuracy and simulation scale of the simulation system,the optimal selection and design of parameters for the interface delay is explored.Finally,the correctness of the theoretical analysis is verified by RT-LAB-based controller hardware-in-the-loop test system.