电网与清洁能源
電網與清潔能源
전망여청길능원
ADVANCES OF POWER SYSTEM & HYDROELECTRIC ENGINEERING
2015年
3期
1-5,17
,共6页
高压直流输电(HVDC)%多端直流输电系统(MMC-HVDC)%电压补偿控制%故障控制
高壓直流輸電(HVDC)%多耑直流輸電繫統(MMC-HVDC)%電壓補償控製%故障控製
고압직류수전(HVDC)%다단직류수전계통(MMC-HVDC)%전압보상공제%고장공제
high voltage direct current transmission(HVDC)%MMC based multi-terminal DC transmission system%voltage compensation principle%fault control
当高压直流输电系统交流侧发生不对称故障时,交流系统会产生负序电压和负序电流,从而引起换流站与交流系统之间的有功功率产生波动,使得直流系统的直流电压产生波动。这种波动的有功功率和直流电压会通过直流线路传输到系统的另两侧,影响其他两侧交流系统运行的稳定性。采用电压补偿控制的方法有效地抑制了负序电流,在PSCAD/EMTDC环境中建立基于MMC的多电平换流器的3端直流系统仿真模型,仿真结果验证了所提出的控制方法的有效性和正确性,提高系统的稳定性。
噹高壓直流輸電繫統交流側髮生不對稱故障時,交流繫統會產生負序電壓和負序電流,從而引起換流站與交流繫統之間的有功功率產生波動,使得直流繫統的直流電壓產生波動。這種波動的有功功率和直流電壓會通過直流線路傳輸到繫統的另兩側,影響其他兩側交流繫統運行的穩定性。採用電壓補償控製的方法有效地抑製瞭負序電流,在PSCAD/EMTDC環境中建立基于MMC的多電平換流器的3耑直流繫統倣真模型,倣真結果驗證瞭所提齣的控製方法的有效性和正確性,提高繫統的穩定性。
당고압직류수전계통교류측발생불대칭고장시,교류계통회산생부서전압화부서전류,종이인기환류참여교류계통지간적유공공솔산생파동,사득직류계통적직류전압산생파동。저충파동적유공공솔화직류전압회통과직류선로전수도계통적령량측,영향기타량측교류계통운행적은정성。채용전압보상공제적방법유효지억제료부서전류,재PSCAD/EMTDC배경중건립기우MMC적다전평환류기적3단직류계통방진모형,방진결과험증료소제출적공제방법적유효성화정학성,제고계통적은정성。
When an asymmetric fault occurs to the AC system side of the HVDC transmission system,the AC system will produce negative sequence voltage and negative sequence current,causing active power fluctuation between the converter station and thee AC system,and DC voltage fluctuations in the DC system. The fluctuant active power and DC voltage will transmit to the other two sides of the system through the DC line and affect the stability of the AC system in the two sides. The method of voltage compensation control adopted in this paper can effectively inhibit the negative sequence current. A simulation model of modular multilevel converter (MMC)based on MTDC in PSCAD/EMTDC is established to verify the corre-ctness and validity of the proposed control method.