CAJ | 학술논문

现有文献对变采样周期锁相环(variable sampling period PLL，VSP_PLL)的原理分析尚不深入，且未给出其调节器设计方法。通过与传统的基于同步旋转坐标系锁相环(synchronous reference frame PLL，SRF_PLL)对比，明晰了VSP_PLL的控制机制，揭示了其内在联系。建立了VSP_PLL的离散域数学模型，分析了采用不同调节器的VSP_PLL环路特性，得出了调节器(包括其型式及参数)的优化设计方法。实验结果验证了所设计的VSP_PLL在电网电压出现谐波、不平衡、幅值及频率瞬变的情况下均可准确快速地锁相。
현유문헌대변채양주기쇄상배(variable sampling period PLL，VSP_PLL)적원리분석상불심입，차미급출기조절기설계방법。통과여전통적기우동보선전좌표계쇄상배(synchronous reference frame PLL，SRF_PLL)대비，명석료VSP_PLL적공제궤제，게시료기내재련계。건립료VSP_PLL적리산역수학모형，분석료채용불동조절기적VSP_PLL배로특성，득출료조절기(포괄기형식급삼수)적우화설계방법。실험결과험증료소설계적VSP_PLL재전망전압출현해파、불평형、폭치급빈솔순변적정황하균가준학쾌속지쇄상。
In existing literatures relevant to variable sampling period phase-locked loop (VSP_PLL) the principle analysis is unsatisfactory and the design approach of its controller is not yet given. Through the comparison of VSP_PLL with traditional synchronous reference frame based PLL, the control mechanism of VSP_PLL is clarified, and the internal relation between them is revealed. A Z-domain mathematical model of VSP_PLL is established and the loop properties of VSP_PLL adopting different regulators are analyzed, thus an optimization method for the regulator, including its type and parameters, is obtained. Experimental results validate that using the designed VSP_PLL the phase-lock can be rapidly and accurately implemented under the harmonics in grid voltage, three-phase imbalance and instantaneous change of voltage amplitude as well as under instantaneous change of grid frequency.