文章摘要
程启明,李涛,张宇,等.基于Lyapunov函数的NPC型三电平SAPF非线性控制策略[J].电力系统自动化,2018,42(11):143-150. DOI: 10.7500/AEPS20170929006.
CHENG Qiming,LI Tao,ZHANG Yu, et al.Lyapunov Function Based Nonlinear Control Strategy of NPC-type Three-level Shunt Active Power Filter[J].Automation of Electric Power Systems,2018,42(11):143-150. DOI: 10.7500/AEPS20170929006.
基于Lyapunov函数的NPC型三电平SAPF非线性控制策略
Lyapunov Function Based Nonlinear Control Strategy of NPC-type Three-level Shunt Active Power Filter
DOI:10.7500/AEPS20170929006
关键词: 三相四线制系统  并联型有源滤波器  不平衡电网  中性点平衡调制算法
KeyWords: three-phase four-wire system  shunt active power filter(SAPF)  unbalanced power grid  modulation algorithm of neutral-point balance
上网日期:2018-03-15
基金项目:国家自然科学基金资助项目(61573239);上海市重点科技攻关计划资助项目(14110500700)
作者单位E-mail
程启明 上海电力学院自动化工程学院, 上海市 200090
上海市电站自动化技术重点实验室, 上海市 200090 
chengqiming@sina.com 
李涛 上海电力学院自动化工程学院, 上海市 200090
上海市电站自动化技术重点实验室, 上海市 200090 
 
张宇 上海电力学院自动化工程学院, 上海市 200090
上海市电站自动化技术重点实验室, 上海市 200090 
 
程尹曼 同济大学电子与信息工程学院, 上海市 201804  
谭冯忍 上海电力学院自动化工程学院, 上海市 200090
上海市电站自动化技术重点实验室, 上海市 200090 
 
高杰 上海电力学院自动化工程学院, 上海市 200090
上海市电站自动化技术重点实验室, 上海市 200090 
 
摘要:
      传统并联型有源滤波器(SAPF)的控制方法只能实现电网平衡时的控制,且在负载发生变化时补偿效果不理想。针对这些问题,选取三相四线制系统下中性点钳位(NPC)型三电平SAPF作为研究对象,提出了基于Lyapunov函数的非线性控制方法。首先,建立了被控对象在dq0坐标系下的数学模型;针对电流内环提出了基于Lyapunov函数的非线性控制策略。同时,从稳定性的角度出发,选取合适的控制参数,保证线路参数变化时平衡/不平衡电网下系统的稳态和动态性能;其次,针对直流侧电压不平衡问题,采用基于电荷平衡原理改变空间矢量脉宽调制算法中正负小矢量作用时间的控制方法,维持直流侧电容电压的稳定和平衡。最后,利用Simulink软件仿真和实验验证将所提出的基于Lyapunov函数的非线性控制器用于NPC型三电平SAPF的可行性和优越性。与传统的比例—积分控制相比,所提出的控制方法有更快的响应速度和更好的补偿效果。
Abstract:
      The conventional control method of shunt active power filter(SAPF)can only achieve the control goal when the power grid is balanced, and the compensation effect is not satisfactory when the load changes. In order to solve these problems, this paper chooses the neutral-point clamped(NPC)three-level SAPF for the three-phase four-wire system as the object of study, then proposes a nonlinear control method based on Lyapunov function. Firstly, the mathematical model of the controlled object in the dq0 coordinate system is established. Then, the nonlinear control strategy based on Lyapunov function is proposed for the current inner loop. From the stability point of view, the appropriate control parameters are selected to ensure the steady-state and dynamic performance of the system under balanced or unbalanced conditions. Thirdly, for the problem of the unbalanced DC side voltage, a control method based on the principle of charge balance is used to change the time between positive and negative small vectors in space vector pulse width modulation(SVPWM)algorithm, to maintain DC capacitor voltage stability and balance. Finally, the feasibility and superiority of applying nonlinear control method based on Lyapunov function to SAPF is verified by the simulation on Simulink software and the experiment. Compared with the conventional PI control, the proposed control method has a faster response speed and better compensation effect.
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