电力系统自动化
電力繫統自動化
전력계통자동화
AUTOMATION OF ELECTRIC POWER SYSTEMS
2012年
14期
166-171
,共6页
阚加荣%谢少军%姚志垒%薛迎成%吴冬春%李小凡
闞加榮%謝少軍%姚誌壘%薛迎成%吳鼕春%李小凡
감가영%사소군%요지루%설영성%오동춘%리소범
LCL滤波器%并网逆变器%电流控制%功率因数%相位矫正
LCL濾波器%併網逆變器%電流控製%功率因數%相位矯正
LCL려파기%병망역변기%전류공제%공솔인수%상위교정
LCL filters%grid-connected inverters%current control%power factor%phase correction
文中分析了LCL滤波并网逆变器系统的稳定性。该并网逆变器采用逆变器侧电感电流作为反馈量,并采用电网电压前馈控制策略,由劳斯判据得到该系统恒稳定的结论。由闭环系统的传递函数确定了电压前馈系数的大小,并根据闭环系统的根轨迹设计了电流环的控制参数。分析了该闭环系统并网功率因数小于1的原因,为克服这一缺点,提出了进网电流相位矫正技术。该技术根据进网电流与电网电压之间的相位差调节电流环基准值的频率,最终使进网电流与电网电压同相位,并网功率因数等于1。进网电流相位矫正技术不会影响原有系统的稳定性。仿真结果验证了该策略的有效性。
文中分析瞭LCL濾波併網逆變器繫統的穩定性。該併網逆變器採用逆變器側電感電流作為反饋量,併採用電網電壓前饋控製策略,由勞斯判據得到該繫統恆穩定的結論。由閉環繫統的傳遞函數確定瞭電壓前饋繫數的大小,併根據閉環繫統的根軌跡設計瞭電流環的控製參數。分析瞭該閉環繫統併網功率因數小于1的原因,為剋服這一缺點,提齣瞭進網電流相位矯正技術。該技術根據進網電流與電網電壓之間的相位差調節電流環基準值的頻率,最終使進網電流與電網電壓同相位,併網功率因數等于1。進網電流相位矯正技術不會影響原有繫統的穩定性。倣真結果驗證瞭該策略的有效性。
문중분석료LCL려파병망역변기계통적은정성。해병망역변기채용역변기측전감전류작위반궤량,병채용전망전압전궤공제책략,유로사판거득도해계통항은정적결론。유폐배계통적전체함수학정료전압전궤계수적대소,병근거폐배계통적근궤적설계료전류배적공제삼수。분석료해폐배계통병망공솔인수소우1적원인,위극복저일결점,제출료진망전류상위교정기술。해기술근거진망전류여전망전압지간적상위차조절전류배기준치적빈솔,최종사진망전류여전망전압동상위,병망공솔인수등우1。진망전류상위교정기술불회영향원유계통적은정성。방진결과험증료해책략적유효성。
According to the Routh criteria, a grid-connected inverter with a LCL filter is stable when the output current of the inverter is used as a feedback variable. The feed-forward coefficient of the grid voltage is obtained from the transfer function of the closed-loop system. The control parameters of the current-loop are designed according to the root locus. The power factor of the grid-connected inverter is not unity. To overcome this shortcoming, this paper proposes a phase correction technique for the grid side current of the inverter. The technique adjusts the frequency of reference current according to the phase separation between the grid voltage and the grid current. The proposed technique improves the power factor to unity. In addition, the technique hardly affects the stability of the closed-loop system. The simulation results verify that the performance of the proposed technique is excellent.