摘要
提出一种基于电压空间矢量脉宽调制(SVPWM)方法的静止同步补偿器(STATCOM)控制方案,并讨论了电压电流双环控制器的简化设计方法。该方法利用锁相环(PLL)和低通滤波器(LPF)检测负载电流中无功电流的大小,通过dq变换实现STATCOM无功电流和有功电流在dq平面的解耦控制。同时,直流电压外环控制器输出耦合到有功电流控制环路实现直流电压稳压控制。为利用SVPWM调制方法控制STATCOM输出电压控制其输出电流,控制器通过PI调节器将电流控制变量变换到电压矢量空间。全部控制算法在单片现场可编程逻辑门阵列(FPGA)中采用VerilogHDL硬件描述语言设计和综合实现,并应用在500kV·A容量样机的控制上。仿真和实验结果显示该控制方法具有动态响应速度快、调制深度高、输出电流谐波畸变率低等优点。
A SVPWM （Space Vector Pulse Width Modulation）-based control scheme is proposed for STATCOM（STATic synchronous COMpensator） and its simplified design of voltage-loop and current-loop controller is discussed. The PLL （Phase-Locked Loop） and LPF（Low Pass Filter） are used to detect the reactive component of load current and the dq transform is used to realize the decoupled control of STATCOM active and reactive currents on dq plane. The DC voltage-loop control output is fed to active current-loop control to make the DC voltage stable. Current control variables are transformed into voltage space vectors by PI regulator to implement SVPWM. Whole control algorithm is written on one FPGA （Field Programmable Gate Array） chip using VerilogHDL, which is applied in the control of a 500 kV.A STATCOM. Simulative and experimental results show its fast dynamic response,high modulation index and low current THD.
出处
《电力自动化设备》
EI
CSCD
北大核心
2008年第9期27-30,共4页
Electric Power Automation Equipment
