电力系统自动化
電力繫統自動化
전력계통자동화
AUTOMATION OF ELECTRIC POWER SYSTEMS
2015年
11期
24-30
,共7页
郭龙%刘崇茹%贠飞龙%李越%朱逸超
郭龍%劉崇茹%贠飛龍%李越%硃逸超
곽룡%류숭여%원비룡%리월%주일초
特高压直流%分层接入%附加功率-电压控制%最优功率比%功率协调控制
特高壓直流%分層接入%附加功率-電壓控製%最優功率比%功率協調控製
특고압직류%분층접입%부가공솔-전압공제%최우공솔비%공솔협조공제
ultra-high voltage direct current (UHVDC)%hierarchical connection%additional power-voltage control%optimal power ratio%power coordination control
结合±1100 kV 特高压直流分层接入方式下受端连接多个交流系统的特点，建立了逆变侧各换流器的附加功率—电压控制，通过独立控制各换流器触发角实现对其输送功率的独立调节。同时，为了减少在紧急功率控制过程中各换流器发生换相失败的可能，提出最优功率比的概念，将整流侧阶梯式功率提升指令按最优功率比进行预估，并分配给逆变侧各换流器的附加功率—电压控制，实现对逆变侧各换流器提升功率的协调控制。基于 PSCAD 仿真平台，采用±1100 kV 特高压直流系统逆变侧分层接入500 kV/1000 kV 交流系统的仿真系统进行验证。结果表明，附加功率—电压控制器能够实现对换流器输送功率的独立控制，有利于发挥分层接入方式下潮流分布可控的优势。功率协调控制策略在紧急功率控制时能够将直流功率合理分配给各换流器，有利于充分利用各换流器输送功率的能力，并减小换流器发生换相失败的可能。
結閤±1100 kV 特高壓直流分層接入方式下受耑連接多箇交流繫統的特點，建立瞭逆變側各換流器的附加功率—電壓控製，通過獨立控製各換流器觸髮角實現對其輸送功率的獨立調節。同時，為瞭減少在緊急功率控製過程中各換流器髮生換相失敗的可能，提齣最優功率比的概唸，將整流側階梯式功率提升指令按最優功率比進行預估，併分配給逆變側各換流器的附加功率—電壓控製，實現對逆變側各換流器提升功率的協調控製。基于 PSCAD 倣真平檯，採用±1100 kV 特高壓直流繫統逆變側分層接入500 kV/1000 kV 交流繫統的倣真繫統進行驗證。結果錶明，附加功率—電壓控製器能夠實現對換流器輸送功率的獨立控製，有利于髮揮分層接入方式下潮流分佈可控的優勢。功率協調控製策略在緊急功率控製時能夠將直流功率閤理分配給各換流器，有利于充分利用各換流器輸送功率的能力，併減小換流器髮生換相失敗的可能。
결합±1100 kV 특고압직류분층접입방식하수단련접다개교류계통적특점，건립료역변측각환류기적부가공솔—전압공제，통과독립공제각환류기촉발각실현대기수송공솔적독립조절。동시，위료감소재긴급공솔공제과정중각환류기발생환상실패적가능，제출최우공솔비적개념，장정류측계제식공솔제승지령안최우공솔비진행예고，병분배급역변측각환류기적부가공솔—전압공제，실현대역변측각환류기제승공솔적협조공제。기우 PSCAD 방진평태，채용±1100 kV 특고압직류계통역변측분층접입500 kV/1000 kV 교류계통적방진계통진행험증。결과표명，부가공솔—전압공제기능구실현대환류기수송공솔적독립공제，유리우발휘분층접입방식하조류분포가공적우세。공솔협조공제책략재긴급공솔공제시능구장직류공솔합리분배급각환류기，유리우충분이용각환류기수송공솔적능력，병감소환류기발생환상실패적가능。
Hierarchical connection mode is a new and attractive mode for ± 1 100 kV ultra-high voltage direct current (UHVDC) system connected to different voltage level AC systems to reduce the scale of the converter transformer.An additional power-voltage controller is designed to enhance the advantages of hierarchical connection mode.The proposed additional power-voltage controller controls the transmitting power between the different AC systems by controlling the firing angle of the series converters on the inverter side.The optimal power ratio is defined,based on which,a power coordinated control strategy is proposed which is capable of reducing the possibility of commutation failure.A ±1 100 kV UHVDC system hierarchically connected to the 500 kV/1 000 kV AC system is built in PSCAD/EMTDC.The simulation results show that the additional power-voltage controller is valid and the power coordination controller is effective in making full use of the transmitting capacity of converters and reducing the possibility of commutation failure. This work is supported by National Natural Science Foundation of China (No.5 1277068),Program for New Century Excellent Talents in University(No.NCET-12-0846)and Program of Introducing Talents of Discipline to Universities(“1 1 1"Program)(No.B08013).
