CAJ | 학술논문

角型链式静止无功发生器(static var generator，SVG)理论上能够进行负序、无功和谐波电流的综合补偿。针对角型补偿器指令电流提取的难题，通过对补偿电路相量图进行几何分析，根据瞬时无功功率理论，推导出dq/Δ变换矩阵。三相电流瞬时值经 abc/dq 变换、滤波，得到两相旋转坐标系下的负序有功电流分量和负序无功电流分量；再经 dq/Δ变换矩阵，可得到角型链式SVG负序补偿所需的相电流指令信号。该变换矩阵可应用于负序补偿系统，也可应用于负序、无功和谐波电流综合补偿系统。所提指令电流提取方法物理意义清晰，算法简单；采用电流瞬时值进行运算，负荷变化时，可实时更新指令电流，动态调节速度快。最后，通过PSIM仿真验证了所提方法的正确性。
각형련식정지무공발생기(static var generator，SVG)이론상능구진행부서、무공화해파전류적종합보상。침대각형보상기지령전류제취적난제，통과대보상전로상량도진행궤하분석，근거순시무공공솔이론，추도출dq/Δ변환구진。삼상전류순시치경 abc/dq 변환、려파，득도량상선전좌표계하적부서유공전류분량화부서무공전류분량；재경 dq/Δ변환구진，가득도각형련식SVG부서보상소수적상전류지령신호。해변환구진가응용우부서보상계통，야가응용우부서、무공화해파전류종합보상계통。소제지령전류제취방법물리의의청석，산법간단；채용전류순시치진행운산，부하변화시，가실시경신지령전류，동태조절속도쾌。최후，통과PSIM방진험증료소제방법적정학성。
It is a challenge to compensate negative sequence, reactive power and harmonic currents by delta-connected cascaded static var generator (SVG) which is theoretically feasible. To solve the problem of the detection reference current for delta-connected cascaded SVG, a dq/Δtransformation matrix was derived through geometric analysis of the compensation circuit phasor diagram, based on the instantaneous reactive power theory. By the abc/dq transformation and filtering, the negative sequence active current component and negative sequence reactive current component in the two-phase rotating coordinate system was got from the three-phase current instantaneous values. By dq/Δtransformation, the phase current reference signal required for the negative sequence compensation with the delta-connected cascaded SVG can be obtained. The transformation matrix can be applied to the negative sequence compensation system, also can be applied to the negative sequence, reactive and harmonic current comprehensive compensation system. The proposed method of reference current detection has clear physical meaning and it is simple. When loads change,the reference current can be updated in real time and the detection method has good dynamic performances. Simulation results verify the correctness of the proposed method.