混合级联APF有源调节与鲁棒无源协调控制方法研究

With the increasing harmonic contamination problems of electric power systems, harmonic mitigation and power quality enhancement have become the research focus in power electronics areas. The hybrid cascaded H-bridge active power filter (APF) utilizes the power semiconductors with different voltage-ratings and switching frequencies, which show benefits of modularity, fewer components, higher output voltage levels, and independent control of dc-link capacitor voltages, and may have wide applications in medium-voltage high-power applications. Nowadays, there are some advancement with respect to the hybrid cascaded topologies as well as the PWM modulation schemes. However, the research in hybrid cascaded APFs is still immature. And there are quite limited research activities in the switching patterns, the state-averaging models, and the energy dissipation mechanism among each H-bridge modules as well as the balancing methods. This project would conduct fundamental research on the switching patterns of the hybrid cascaded APF and establish the state-averaging models. The current tracking methodologies would be studied under grid and load disturbances as well as parameter uncertainties. The energy dissipation mechanism and adaptive parameter identification method would also be studied. The additional phase-shift components of the switching instants would be used to regulate the energy exchange among the individual H-bridge module. The interconnection and damping assignment (IDA) technique would be adopted to adjust the nonlinear damping injection, in order to achieve the coordinated control of active regulation and robust passivity-based control. The effectiveness of the proposed methodologies would be verified by using digital simulation and experiments from the dSPACE platform and hardware prototype system, which would provide technique support for power quality conditioning in the medium-voltage high-power applications.

电力系统谐波污染日益加剧，谐波治理和电能质量改善已成为电力电子领域的研究热点。混合级联有源滤波器利用不同耐压等级、不同开关频率的功率器件协调工作，具有结构模块化、开关器件少、输出电平多，直流母线电压独立控制等优点，在中压大容量场合应用前景广阔。目前混合级联拓扑和混合PWM调制有一定研究进展，但混合级联有源滤波器的研究较少，其开关切换模式与状态平均化建模、各H桥之间能量耗散特性与均衡控制等问题研究依然薄弱。本项目拟在分析混合级联有源滤波器开关切换模式基础上，建立平均化模型；研究计及电网、负载扰动和参数不确定情况下电流跟踪方法；研究系统能量耗散特性和参数自适应辨识方法，引入开关切换时刻附加偏移量来调节各H桥之间能量交换，采用互联与阻尼分配的无源控制方法调节非线性阻尼，实现有源调节与鲁棒无源协调控制。通过数字仿真、dSPACE和功率级样机实验验证算法有效性，为中压大容量电能质量控制提供技术支撑。

混合级联有源滤波器利用不同耐压等级、不同开关频率的功率器件协调工作，具有结构模块化、开关器件少、输出电平多，直流母线电压独立控制等优点，在中压大容量场合应用前景广阔。国内外相关研究基础薄弱，没有形成一套理论体系和可以工程应用的实用化技术，本项目在分析混合级联多电平逆变器调制方法、数学建模的基础上，对并网电流控制、稳定性分析、电网同步锁相等关键问题进行深入研究，并进行数字仿真、dSPACE和功率级样机实验验证，对孤岛模式带线性／非线性负载，并网模式下的吸／发无功电流，补偿负载非线性电流等进行了丰富的实验研究，并将相关技术拓展到光伏、风电及微电网的应用场合，取得多项创新性研究成果，为中压大容量场合的电能质量控制提供了重要的技术积累。