用于SVC控制系统的新型软件锁相环的设计与实现

Design and Realization of a Novel Software Phase-lock Loop for the SVC Control System

针对SVC(Static Var Compensation,简称SVC)控制系统的同步问题,通过充分利用控制装置硬件资源,设计了一种新型软件锁相环,在DSP(Digital Signal Processing,简称DSP)单元编码实现软件锁相模块,以现场FPGA(Field Programmable Gate Array,简称FPGA),锁相计数器替代复杂的积分环节,产生锁相角θ,配合实现锁相。通过仿真和试验验证,软件锁相环在电压不平衡、电压跌落、频率突变等条件下,仍可快速、可靠的实现锁相,减小触发误差,具有良好的应用效果。

With respect to synchronization of SVC { Static Var Compensation} control system, this paper designs a novel software phase-locked loop by making full use of the hardware resource of the control device. Software phase-lock module is realized through coding in the digital signal processing unit （ DSP） , and the field programmable gate array （FPGA） and the phase-lock counter are used in place of complicated integration element to generate phase-locking angle e to help realize phase locking. Simulation and tests verify that the presented software phase-lock loop still can perform its function quickly and reliably even in case of voltage imbalance, voltage drop or frequency discontinuity, thus reducing triggering error. It produces a good application effect.