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VSC-MTDC输电系统的直流侧运行特性分析与稳态工作点计算

DOI: 10.13334/j.0258-8013.pcsee.2015.04.004, PP. 786-795

Keywords: 电压源型换流器,直流输电,多端直流,运行特性,稳态工作点,调度

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Abstract:

由于换流站数目、控制模式以及指令值的不同,电压源换流器型多端直流(voltagesourceconverterbasedmultiterminaldc,VSC-MTDC)输电系统在实际运行中具有多种运行方式,并且随着电网运行条件的变化,VSC-MTDC输电系统的运行方式也随之改变。因此,直流运行中心需要根据换流站运行特性、电网条件和系统参数等快速确定VSC-MTDC输电系统运行控制模式与系统状态量,这对系统调控和安全运行具有重要意义。基于此,分析主导换流站、辅助换流站、定有功功率控制换流站和风电场换流站的直流电压-电流运行特性,推导各换流站在不同控制模式下的特性方程,给出各换流站不同控制模式下的电气量范围。接着,提出VSC-MTDC输电系统稳态工作点的计算方法,完善换流站的控制模式修正方法。最后,以典型的五端直流输电系统为例,Matlab编程验证了直流运行特性分析方法和稳态工作点计算方法的准确性;计算结果表明,该稳态分析方法能够快速准确地计算出VSC-MTDC输电系统的稳态工作点。

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