电流型潮流控制器对多端直流系统中直流电压振荡模式提供的虚拟阻尼分析
Analysis of Virtual Damping Supplied From CFC to the DC Oscillation Mode in VSC-MTDC
-
摘要: 基于虚拟阻尼分析法,研究电流型潮流控制器(current flow control,CFC)接入对多端柔性直流系统(voltage source converter based multi-terminal direct current,VSC-MTDC)中直流电压振荡模式的影响。首先,针对含CFC的多端柔性直流系统,分别描述CFC控制系统和多端柔性直流系统的动态过程,以直流系统中的直流电压振荡环节为前馈环节,建立剩余直流系统和CFC控制系统作为反馈环节的Phillips-Heffron线性化模型。然后,将传统的阻尼转矩分析法进行推广,介绍虚拟阻尼分析法的概念及其原理,分析CFC接入对不同控制下多端柔性直流系统中直流电压振荡模式的影响,提出能够评估CFC接入对多端柔性直流系统中直流电压振荡模式影响的虚拟阻尼判据。最后,以一个含CFC的三端柔性直流系统为例,得出在不同直流系统控制模式下电流型潮流控制器接入对直流电压振荡模式阻尼的影响规律,采用模式分析法和时域仿真法分别验证了虚拟阻尼分析法的正确性和虚拟阻尼判据的有效性。Abstract: The impact of current flow control（CFC） on DC voltage oscillation mode of voltage source converter based multi-terminal direct current（VSC-MTDC） was researched by virtual damping analysis in this paper. Firstly, dynamic of CFC control subsystem and VSC-MTDC subsystem were described respectively, and the Phillips-Heffron linearization model of VSC-MTDC with CFC was established where the CFC control subsystem is as a feedback loop. And then, the virtual damping analysis method was proposed by extending the traditional damping torque analysis, the impact of CFC on oscillation modes of VSC-MTDC with different control methods was researched and evaluated by virtual damping index. Finally, a three terminal VSC-MTDC with a CFC was as an example, the influence law of CFC on VSC-MTDC was concluded and the correctness of virtual damping criterion was verified by model analysis and time domain simulation.
下载:
