电测与仪表
電測與儀錶
전측여의표
ELECTRICAL MEASUREMENT & INSTRUMENTATION
2015年
9期
113-118
,共6页
光伏逆变器%低电压穿越%直接功率控制%正序负序电流%双闭环矢量控制
光伏逆變器%低電壓穿越%直接功率控製%正序負序電流%雙閉環矢量控製
광복역변기%저전압천월%직접공솔공제%정서부서전류%쌍폐배시량공제
PV inverter%low voltage ride through%direct power control%positive and negative sequence current%double closed-loop vector control
从改变控制策略上，成功实现电网故障下光伏逆变器的低电压穿越。分别提出了抑制对称故障的直接功率控制策略和抑制不对称故障的基于正序、负序电流的双闭环矢量控制策略。在对称故障时，采用限功率运行的方法改变输入功率指令，减少光伏电池对电网的输出功率，实现电网对称故障下的成功穿越。在不对称故障时，提取出电网中的正序和负序分量，采用正序和负序电流双闭环矢量控制，有效地抑制了瞬时电流冲击。仿真结果表明，两种不同故障工况下控制策略的合理性和有效性。
從改變控製策略上，成功實現電網故障下光伏逆變器的低電壓穿越。分彆提齣瞭抑製對稱故障的直接功率控製策略和抑製不對稱故障的基于正序、負序電流的雙閉環矢量控製策略。在對稱故障時，採用限功率運行的方法改變輸入功率指令，減少光伏電池對電網的輸齣功率，實現電網對稱故障下的成功穿越。在不對稱故障時，提取齣電網中的正序和負序分量，採用正序和負序電流雙閉環矢量控製，有效地抑製瞭瞬時電流遲擊。倣真結果錶明，兩種不同故障工況下控製策略的閤理性和有效性。
종개변공제책략상，성공실현전망고장하광복역변기적저전압천월。분별제출료억제대칭고장적직접공솔공제책략화억제불대칭고장적기우정서、부서전류적쌍폐배시량공제책략。재대칭고장시，채용한공솔운행적방법개변수입공솔지령，감소광복전지대전망적수출공솔，실현전망대칭고장하적성공천월。재불대칭고장시，제취출전망중적정서화부서분량，채용정서화부서전류쌍폐배시량공제，유효지억제료순시전류충격。방진결과표명，량충불동고장공황하공제책략적합이성화유효성。
By means of changing the control strategy , successfully achieve the low voltage ride through of PV inverter under the grid fault .The direct power control strategy and double closed -loop vector control based on positive se-quence and negative sequence current are respectively proposed under the balance fault and unbalance fault .When the voltage of grid is balanced , adopting the method of limiting active power to change the input power order , thus re-ducing the output active power of PV and realize LVRT successfully .When the unbalanced fault happens , carrying out positive and negative sequence separation , and the positive and negative sequence current double-loop vector con-trol effectively inhabites the transient current surge .The simulation results show the rationality and effectiveness of control strategy under the two different fault conditions .
