四桥臂有源电力滤波器双闭环控制策略
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摘要
提出一种由重复控制电流外环和基于PI控制的电流内环构成的双闭环控制策略,以改善三相四桥臂有源电力滤波器(APF)的动态响应速度并提高谐波电流补偿增益。给出了电流双闭环控制策略的设计原理,对控制系统的稳定性进行了详细分析。进一步提出一种零序电压线性控制脉宽调制策略,以解决传统三维空间矢量脉宽调制(3D-SVPWM)策略计算复杂的问题。推导了N桥臂开关管占空比与参考电压零序分量之间的线性关系,并由此得出桥臂开关管占空比的表达式。通过仿真和实验验证了所提闭环控制策略的正确性与有效性。
A dual closed-loop control strategy consisting of repetitive current outer loop and current inner loop based on PI control is proposed to improve the dynamic response speed and harmonic current compensation gain of threephase four-leg active power filter(APF).The design principle of current dual closed-loop control strategy is given,and the stability of the control system is analyzed in detail.Furthermore, a zero sequence voltage linearly controlled pulse width modulation strategy is proposed to solve the traditional three-dimensional space vector pulse width modulation(3D-SVPWM)strategy computes complex problems.The linear relationship between duty ratio of neutral leg and zero sequence component of reference voltage is derived,and the expression of duty cycle is obtained.The correctness and effectiveness of the proposed closed-loop control strategy are verified by simulation and experiments.
A dual closed-loop control strategy consisting of repetitive current outer loop and current inner loop based on PI control is proposed to improve the dynamic response speed and harmonic current compensation gain of threephase four-leg active power filter(APF).The design principle of current dual closed-loop control strategy is given,and the stability of the control system is analyzed in detail.Furthermore, a zero sequence voltage linearly controlled pulse width modulation strategy is proposed to solve the traditional three-dimensional space vector pulse width modulation(3D-SVPWM)strategy computes complex problems.The linear relationship between duty ratio of neutral leg and zero sequence component of reference voltage is derived,and the expression of duty cycle is obtained.The correctness and effectiveness of the proposed closed-loop control strategy are verified by simulation and experiments.
引文
[1]乐健,刘开培.基于统一数学模型的三相四线制并联有源电力滤波器的参数优化方法[J].电工技术学报,2012,27(10):220-227.
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[2] V V Jogdand,V M Panchade.PI and Fuzzy Logic Based Shunt APF for Power Quality Enhancement[A]. 2016 International Conference on Electrical Power and Energy Systems[C].2016:401-406.
[3] R V L Narayana Divakar,B Tulasi Rao.Realization of Current Control Strategies of Shunt Active Power Filter Operating With Unbalanced Loads[A]. 2016 International Conference on Signal Processing,Communication,Power and Embedded System[C].2016:1573-1577.
[4]杨秋霞,梁雄国,郭小强,等.准谐振控制器在有源电力滤波器中的应用[J].电工技术学报,2009,24(7):171-176.
[5] J S Hu,J N Lin,H C Chen.A Discontinuous Space Vector PWM Algorithm in ABC Reference Frame for Multilevel Three-phase Cascaded H-bridge Voltage Source Inverters[J].IEEE Trans. on Industrial Electronics,2017,64(11):8406-8414.
[6]戴宁怡,黄民聪,唐净.新型三维空间矢量脉宽调制在三相四线系统中的应用[J].电力系统自动化,2003,27(17):45-49.
[7] X H Wang,C L Bao,X B Ruan,et al.Design Considerations of Digitally Controlled LCL-filtered Inverter With Capacitor-curren-feedback Active Damping[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2014,2(4):972-984.