现有电网换相换流器型高压直流输电(line commutated converter based HVDC，LCC-HVDC)输电系统动态等值计算依赖于送受端电压同步实时量测，无法实现经 LCC-HVDC输电送出系统的单端暂态等值计算。论文基于直流系统动态相量等值计算框架，提出仅基于逆变侧单端交流电压信息的经LCC-HVDC直流输电送出系统的等值计算方案，论证整流侧准稳态模型+逆变侧动态相量模型的混合等值计算框架的可行性，解决换相失败准确判别等关键问题，仿真对比分析了多场景故障，证明所提出的计算框架在送端交流系统信息缺失的情况下，能实现受端交流线路故障暂态大扰动下经LCC-HVDC输电送出系统响应的准确实时计算。
Single Terminal Mixed Equivalence Calculation of Power Transmission System via LCC-HVDC
The dynamic equivalent calculation of the existing line commutated converter based HVDC(LCC-HVDC)transmission system depends on the synchronous real-time measurement of the voltage at the sending and receiving ends,and it is impossible to realize the single-end transient equivalent calculation of the transmission system through LCC-HVDC.Based on the dynamic phasor equivalent calculation framework of the DC system,the paper proposes an equivalent calculation scheme of the DC transmission system through LCC-HVDC based on the single-terminal AC voltage information of the inverter side only,demonstrates the feasibility of the hybrid equivalent calculation framework of the quasi-steady state model of the rectifier side and the dynamic phasor model of the inverter side,solves the key problems such as accurate identification of commutation failure,as well as compares and analyzes the multi-scenario faults through simulation.It is proved that the proposed calculation framework can achieve accurate real-time calculation of the response of LCC-HVDC transmission system under the large transient disturbance of AC line fault at the receiving end when the information of the AC system at the sending end is missing.
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