多逆变器型微网运行与复合控制研究
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摘要
包含不同能源形式和不同容量电源的微网系统是目前国际上研究的热点,微网主要包括旋转电机接口和逆变器型接口两种形式的微源,前者如微型燃气轮机、柴电机组、小水电等技术成熟,组网方便,而后者逆变器型微源不具备旋转电机或区域电网同步发电机组一样优良的外特性,如何控制微网中多个微源逆变器间的协调运行,实现不同容量逆变型微源间功率精确分配和环流控制,提升微网集群电源供电模式下供电质量,提出高效电能质量管理平台,是实现微网运行控制亟待解决的关键。
针对多逆变器型微网运行与控制以及特殊电能质量问题,本文在国家重点基础研究发展计划项目(973计划)“分布式发电供能系统相关基础研究”子项“微网及含微网配电系统电能质量分析与控制”(2009CB219706)、湖南省研究生科研创新项目(CX2011B130)“多逆变器环境大型光伏电站(并网、微网)电能质量一些问题的研究”以及湖南大学博士论文选题资助计划资助下,详细阐述了含微网配电网高效电能质量控制方法,对微网综合控制策略、逆变型微源复合控制方法、含微网配电网电能质量综合控制平台进行了讨论,从逆变器型微网内部到外部配电网,从整体控制策略到单元控制方法,形成了较为完善的微网高效用能控制方法的基本研究方法和技术方案,研究重点及取得的成果主要体现在以下几个方面：
1、论述了分布式发电和微网的研究现状,阐述了课题研究的意义,总结了微网结构和定义、系统特点、微源种类以及主要控制方法和控制的主要问题,比较了现有微网的控制策略及各自优势,对课题研究的主要科学内容和对微网运行与控制、特殊电能质量问题及复合控制方法以及群控平台的研究进展进行了综述。
2、提出了一种微源对等控制和主从控制结合的多逆变器型微网的综合控制策略,在这种控制策略中,设计了具备恒压恒频功能的改进下垂控制器,作为微网孤岛运行时提供基准电压和频率并分享负荷功率变化,并以等效输出阻抗成感性为例,分析了等效输出阻抗对功率分配的影响机理及传统下垂控制法的局限,针对一种包含电压电流环的多环反馈控制器结构,通过构造积分器,重新设计等效输出阻抗,解除无功功率控制与等效输出阻抗的制衡关系,使改进下垂控制器在不同容量微源并联系统应用中具备较强的鲁棒性能,提高了负荷功率分配精度,有效降低系统环流；设计了适用于电压源逆变器的PQ控制器,保证微源输出功率等于设定值。构造了采用上述改进下垂控制器和PQ控制器的多逆变器型微网仿真平台用于后续章节分析。
3、根据逆变型微源的拓扑结构、输出特性、网络构造以及负荷特性,针对微网特殊电能质量问题,在主动控制和被动治理两个层而提出了电能质量综合治理措施。其中,在主动控制方向,提出一种具备谐波和无功补偿功能的微源逆变器控制方法,可根据调度指令发出有功和补偿谐波及无功,补偿非线性负载产生的谐波,保证并网节点电能质量处于较高水平；仿照区域电网同步发电机运行特性提出一种基于虚拟同步发电机技术的微网逆变器控制器,并与传统功率下垂控制法对比,分析了其在抑制微网系统环流方面的优势；三相四线制微网逆变器输出电压波形受电网畸变电压、负载谐波电流和直流侧电压中点平衡的共同作用,为使直流侧电压中点维持稳定并使输出电压波形跟踪参考电压,针对一种四桥臂逆变器结构进行建模,提出一种三相四线制微网四桥臂逆变器高质量并网H-∞控制方法,构造高带宽鲁棒控制器对中线桥臂和三相桥臂进行统一控制,在较大中线电流和电网电压畸变情况下四桥臂逆变器能够克服各种扰动因素影响,能够提升微网供电质量；提出电网电压不平衡条件下改进PQ控制方法,基于平衡假设的前馈解耦PQ控制是微网典型的控制策略,通过对这种微网控制策略进行功率分析,并利用开关函数法分析并网逆变器输出性能,基于平衡假设的控制策略在电网电压不平衡条件下逆变器的输出会包含三次谐波和负序分量,在原有的PQ控制结构基础上叠加前馈负序电压控制环以抵销电网电压负序分量从而维持三相平衡,并通过改进的开关函数调制法降低三次谐波分量输出。
4、在提出的微网控制结构基础上,进行了各工况暂态特性仿真分析,分析了典型的感应电动机负荷对微网暂态稳定的影响、微网联网、孤岛模式切换特殊时刻的供电质量水平、有目的的切除负荷、切除微源对微网系统供电的影响、改变微源输出功率时微网的暂态响应、对不平衡负荷、非线性负荷等引起的特殊电能质量问题进行了仿真分析。
5、提出一种含微网和分布式发电以及电能质量控制装备的配网综合电能质量管理平台,介绍了基于多Agent系统的网架结构和通信方式及其约束条件,提出一种由核心层、汇聚层、接入层和对外服务层构成的含分布式发电、微网和电能质量控制装备的网络拓扑,在算例部分,提出微网与配电网静止无功发生器(DSTATCOM)联合运行系统和逆变型微源与静止无功补偿器(SVC)联合运行系统,详细研究具备相同逆变器拓扑结构的电能质量治理装备与微源的相互影响机理和控制域耦合关系以及电能质量治理装置在平抑微网电压波动、协助低电压穿越和补偿无功方面的效果,并探讨了APF装置不同安装点和控制方法应用于低压微网中效能比较,以及就高渗透率下微网并入配网的动态过程进行了详细分析并比较了逆变型接口微源和旋转电机型微源在支撑配网功率、辅助故障穿越过程中的作用。
本文就多逆变器型微网运行与控制方法和一些特殊电能质量问题治理方法进行了讨论,主要提出了一种基于改进下垂控制方法和PQ控制的微网控制新结构,提出了主被动相结合的微网电能质量治理方案,并就逆变型微网特殊电能质量问题复合控制方法进行了讨论,完成了多逆变器型微网多工况暂态仿真,提出含分布式发电、微网以及电能质量控制装备的综合能力按管理平台,从理论到方法,从方法到仿真,配合集中控制平台可增强微网功率控制能力和提升电能质量水平,研究成果可应用于大型光伏电站组网、屋顶电站、智能配网、农业配电网、新能源以及其他特别是多组逆变器并联的场合。
Micro-grid system containing different energy forms and power source capacities has become a hot international research topic currently, which includes micro-sources with rotating machine interface and micro-sources with inverter interface. The technology of the former type such as micro turbine, diesel generator units and small hydroelectric power plant is already mature. However, the latter type is not equipped with excellent outside characteristics as synchronous generators in large power system. Thus, how to control the coordination mechanism between multi micro source inverters in micro-grid system, how to realize accurate power distribution between micro sources with different capacity as well as circulation control and how to improve power supply quality are the key problems to realize micro-grid operation that need to be solved urgently.
Due to the operating and control as well as some special power quality problems of micro-grid with inverters, meanwhile, under the support of the following projects: the sub-item " Power Quality Analysis and Control of Micro-grid and distribution system with micro-grid"(2009CB219706) of The National Basic Research Program Basic Science Research of Distributed Power Generation Systems"(973Program) Hunan Province Graduate Student Scientific Research Innovation Project(CX2011B130)"Power Quality Research on Large Photovoltaic Station(Gird-connected state, Islanded state) with Multi Inverters Environment", Hunan university Ph.D. thesis selection aid scheme in2009, the paper illustrates efficient power quality control of distribution system with micro-grid, discusses the comprehensive control strategies of micro-grid, compound control methods of micro-sources with inverters, power quality integrated management platform of distribution system with micro-grid not only from inner parts of micro-grid with inverters to external distribution system, but also from the whole control strategies to unit control methods, thus forms comparatively perfect basic research and technical methods of efficient use of energy on micro-grid. The key points and achievements are showed as follows:
1. Research status of distributed generation and micro-grid has been described. The paper expounds the subject significance and summarizes micro-grid structure and definition, system characteristics, micro source varieties,the principal control method and primary problems existing in control process. The existing micro-grid control strategies and their respective advantages have been contrasted. Then, the main subject research content, micro-grid operation and control, special power quality problems, compound control method and group control platform research have been summed up.
2The integrated control scheme of multi-inverter interface micro-grid based on the combination of peer-to-peer and master-slave control is raised. In this control strategy, improved drooping controller with constant voltage constant frequency function has been designed to supply voltage and frequency standard for micro-grid in island operation mode and to share load power variation. The paper takes inductive equivalent output impedance as an example, analyzing its influence mechanism to power distribution and the limitations of traditional drooping control method. Directing at the multi-loop feedback controller structure containing voltage and current loop, by constituting integrators, redesigning equivalent output impedance, removing the balance relationship between reactive power control and equivalent output impedance, the improved drooping controller possesses strong robustness ability in application of micro source parallel system with different capacities, which increased load power distribution precision as well as reduced system circulation effectively. PQ controller which is suitable for voltage source inverter has been devised, ensuring that micro source output power is equal to the reference value. Multi-inverter interface micro-grid simulation platform adopted the above improved drooping controller and PQ controller is structured for subsequent chapters analysis.
3.According to topology structure, output characteristics, network structure and load characteristics of micro-sources with inverters, comprehensive power quality control measures haves been presented in active and passive control aspects directing at special power quality problems in micro-grid. In the active control direction, inverter control method with harmonic suppression and reactive power compensation function has been put forward. Active power can be sent out while harmonic generated by nonlinear load and reactive power can compensated according to scheduling instruction. Meanwhile, power quality of grid-connected node can be guaranteed at high level. Following operation characteristic of synchronous generator in power grid, micro-grid inverter controller based on a virtual synchronous generator technology has been described. Moreover, contrasting with traditional power drooping control method, the paper analyzes its advantages in the way of suppressing circulation. Output voltage waveform of three-phase four-wire micro-grid inverter is affected by grid distortion voltage, harmonic current of load and neutral-point voltage balance at dc side jointly. In order to maintain neutral-point voltage stable and to make output voltage waveform tracking reference voltage, the paper has set up model according to a four-bridge arm inverter structure and proposed four-bridge arm inverter high quality grid-connected H-oocontrol method for three-phase four wire micro-grid. High bandwidth, wide robust controller has been built to control neutral bridge arm and three-phase bridge arm unified. The four-bridge arm inverter could overcome various kinds of disturbance factors under the large neutral current or grid voltage distortion conditions, which could improve micro-grid power quality. Improved PQ control methods under voltage unbalance conditions of power grid have been proposed. Feed-forward decoupling PQ control based on balance assumption is a typical micro-grid control strategy. By carrying out power analysis on the above control strategy and taking advantage of switch function method to analyze output performance of grid-connected inverter, the output of inverter would contain3th order harmonic and negative sequence component based on balance assumption control strategy under voltage unbalance condition. On the basis of the original PQ control structure, negative sequence voltage control loop has been imposed to offset negative sequence components in power grid voltage. Thereby, three-phase balance can be maintained. Furthermore,3th order harmonic component output could be reduced by the modified switch function modulation method.
4、Based on the proposed micro-grid control structure, transient characteristics simulation analysis under various working conditions has been carried out. The paper analyzes and simulates the transient stability influence caused by typical induction motor load, power supply quality level at special moment when micro-grid change the operation mode, the impacts on micro-grid power supply when remove load or micro source purposely, micro-grid transient response process when change micro source output power and special power quality problem induced by unbalanced load or nonlinear load. The paper analyzes the dynamic process of micro-grid connecting to distribution grid in detail, compares the role of inverter interface micro source with rotating machine interface micro source in supporting distribution grid power and assisting passing through voltage breakdown process.
5、An integrated management platform including micro-grid, distributed generation and power quality control equipments has been presented. Grid structure as well as communication mode with its constraint condition based on multi-agent system have been introduced. The paper raised the network topology consisting of core layer, convergence layer, access layer and foreign service layer. In the examples, micro-grid combined with DSTATCOM operation system as well as inverter interface micro-source combined with static var compensator (SVC) operation system have been proposed. Besides, the mutual interaction mechanism and coupling relation in control field between power quality management equipment equipped with the same topological structure as inverters and micro-sources, as well as the effect that power quality control equipment performed in the aspect of suppressing micro-grid voltage fluctuation, assisting low-voltage crossing and compensating reactive power have all been studied in detail.
The paper discusses multi-inverter interface micro-grid operation and control methods as well as management methods on some special power quality problems. A new micro-grid control structure based on improved drooping control methods and PQ control has been presented chiefly. Besides, micro-grid power quality management scheme combined with active and passive control has been put forward. According to compound control methods on special power quality problems of inverter interface micro-grid, transient simulations of multi-inverter interface micro-grid under various working conditions have been completed. Furthermore, the paper set up integrated management platform including distributed generation, micro-grid and power quality control equipments from theory to method, then to simulation. Coordination of centralized control platform could strengthen the control ability of micro-grid power and promote the level of power quality. The research results can be applied in such occasions as large photovoltaic power station, roof power station, intelligent distribution network, agricultural distribution network, new energy and especially multi-group parallel inverters.
针对多逆变器型微网运行与控制以及特殊电能质量问题,本文在国家重点基础研究发展计划项目(973计划)“分布式发电供能系统相关基础研究”子项“微网及含微网配电系统电能质量分析与控制”(2009CB219706)、湖南省研究生科研创新项目(CX2011B130)“多逆变器环境大型光伏电站(并网、微网)电能质量一些问题的研究”以及湖南大学博士论文选题资助计划资助下,详细阐述了含微网配电网高效电能质量控制方法,对微网综合控制策略、逆变型微源复合控制方法、含微网配电网电能质量综合控制平台进行了讨论,从逆变器型微网内部到外部配电网,从整体控制策略到单元控制方法,形成了较为完善的微网高效用能控制方法的基本研究方法和技术方案,研究重点及取得的成果主要体现在以下几个方面：
1、论述了分布式发电和微网的研究现状,阐述了课题研究的意义,总结了微网结构和定义、系统特点、微源种类以及主要控制方法和控制的主要问题,比较了现有微网的控制策略及各自优势,对课题研究的主要科学内容和对微网运行与控制、特殊电能质量问题及复合控制方法以及群控平台的研究进展进行了综述。
2、提出了一种微源对等控制和主从控制结合的多逆变器型微网的综合控制策略,在这种控制策略中,设计了具备恒压恒频功能的改进下垂控制器,作为微网孤岛运行时提供基准电压和频率并分享负荷功率变化,并以等效输出阻抗成感性为例,分析了等效输出阻抗对功率分配的影响机理及传统下垂控制法的局限,针对一种包含电压电流环的多环反馈控制器结构,通过构造积分器,重新设计等效输出阻抗,解除无功功率控制与等效输出阻抗的制衡关系,使改进下垂控制器在不同容量微源并联系统应用中具备较强的鲁棒性能,提高了负荷功率分配精度,有效降低系统环流；设计了适用于电压源逆变器的PQ控制器,保证微源输出功率等于设定值。构造了采用上述改进下垂控制器和PQ控制器的多逆变器型微网仿真平台用于后续章节分析。
3、根据逆变型微源的拓扑结构、输出特性、网络构造以及负荷特性,针对微网特殊电能质量问题,在主动控制和被动治理两个层而提出了电能质量综合治理措施。其中,在主动控制方向,提出一种具备谐波和无功补偿功能的微源逆变器控制方法,可根据调度指令发出有功和补偿谐波及无功,补偿非线性负载产生的谐波,保证并网节点电能质量处于较高水平；仿照区域电网同步发电机运行特性提出一种基于虚拟同步发电机技术的微网逆变器控制器,并与传统功率下垂控制法对比,分析了其在抑制微网系统环流方面的优势；三相四线制微网逆变器输出电压波形受电网畸变电压、负载谐波电流和直流侧电压中点平衡的共同作用,为使直流侧电压中点维持稳定并使输出电压波形跟踪参考电压,针对一种四桥臂逆变器结构进行建模,提出一种三相四线制微网四桥臂逆变器高质量并网H-∞控制方法,构造高带宽鲁棒控制器对中线桥臂和三相桥臂进行统一控制,在较大中线电流和电网电压畸变情况下四桥臂逆变器能够克服各种扰动因素影响,能够提升微网供电质量；提出电网电压不平衡条件下改进PQ控制方法,基于平衡假设的前馈解耦PQ控制是微网典型的控制策略,通过对这种微网控制策略进行功率分析,并利用开关函数法分析并网逆变器输出性能,基于平衡假设的控制策略在电网电压不平衡条件下逆变器的输出会包含三次谐波和负序分量,在原有的PQ控制结构基础上叠加前馈负序电压控制环以抵销电网电压负序分量从而维持三相平衡,并通过改进的开关函数调制法降低三次谐波分量输出。
4、在提出的微网控制结构基础上,进行了各工况暂态特性仿真分析,分析了典型的感应电动机负荷对微网暂态稳定的影响、微网联网、孤岛模式切换特殊时刻的供电质量水平、有目的的切除负荷、切除微源对微网系统供电的影响、改变微源输出功率时微网的暂态响应、对不平衡负荷、非线性负荷等引起的特殊电能质量问题进行了仿真分析。
5、提出一种含微网和分布式发电以及电能质量控制装备的配网综合电能质量管理平台,介绍了基于多Agent系统的网架结构和通信方式及其约束条件,提出一种由核心层、汇聚层、接入层和对外服务层构成的含分布式发电、微网和电能质量控制装备的网络拓扑,在算例部分,提出微网与配电网静止无功发生器(DSTATCOM)联合运行系统和逆变型微源与静止无功补偿器(SVC)联合运行系统,详细研究具备相同逆变器拓扑结构的电能质量治理装备与微源的相互影响机理和控制域耦合关系以及电能质量治理装置在平抑微网电压波动、协助低电压穿越和补偿无功方面的效果,并探讨了APF装置不同安装点和控制方法应用于低压微网中效能比较,以及就高渗透率下微网并入配网的动态过程进行了详细分析并比较了逆变型接口微源和旋转电机型微源在支撑配网功率、辅助故障穿越过程中的作用。
本文就多逆变器型微网运行与控制方法和一些特殊电能质量问题治理方法进行了讨论,主要提出了一种基于改进下垂控制方法和PQ控制的微网控制新结构,提出了主被动相结合的微网电能质量治理方案,并就逆变型微网特殊电能质量问题复合控制方法进行了讨论,完成了多逆变器型微网多工况暂态仿真,提出含分布式发电、微网以及电能质量控制装备的综合能力按管理平台,从理论到方法,从方法到仿真,配合集中控制平台可增强微网功率控制能力和提升电能质量水平,研究成果可应用于大型光伏电站组网、屋顶电站、智能配网、农业配电网、新能源以及其他特别是多组逆变器并联的场合。
Micro-grid system containing different energy forms and power source capacities has become a hot international research topic currently, which includes micro-sources with rotating machine interface and micro-sources with inverter interface. The technology of the former type such as micro turbine, diesel generator units and small hydroelectric power plant is already mature. However, the latter type is not equipped with excellent outside characteristics as synchronous generators in large power system. Thus, how to control the coordination mechanism between multi micro source inverters in micro-grid system, how to realize accurate power distribution between micro sources with different capacity as well as circulation control and how to improve power supply quality are the key problems to realize micro-grid operation that need to be solved urgently.
Due to the operating and control as well as some special power quality problems of micro-grid with inverters, meanwhile, under the support of the following projects: the sub-item " Power Quality Analysis and Control of Micro-grid and distribution system with micro-grid"(2009CB219706) of The National Basic Research Program Basic Science Research of Distributed Power Generation Systems"(973Program) Hunan Province Graduate Student Scientific Research Innovation Project(CX2011B130)"Power Quality Research on Large Photovoltaic Station(Gird-connected state, Islanded state) with Multi Inverters Environment", Hunan university Ph.D. thesis selection aid scheme in2009, the paper illustrates efficient power quality control of distribution system with micro-grid, discusses the comprehensive control strategies of micro-grid, compound control methods of micro-sources with inverters, power quality integrated management platform of distribution system with micro-grid not only from inner parts of micro-grid with inverters to external distribution system, but also from the whole control strategies to unit control methods, thus forms comparatively perfect basic research and technical methods of efficient use of energy on micro-grid. The key points and achievements are showed as follows:
1. Research status of distributed generation and micro-grid has been described. The paper expounds the subject significance and summarizes micro-grid structure and definition, system characteristics, micro source varieties,the principal control method and primary problems existing in control process. The existing micro-grid control strategies and their respective advantages have been contrasted. Then, the main subject research content, micro-grid operation and control, special power quality problems, compound control method and group control platform research have been summed up.
2The integrated control scheme of multi-inverter interface micro-grid based on the combination of peer-to-peer and master-slave control is raised. In this control strategy, improved drooping controller with constant voltage constant frequency function has been designed to supply voltage and frequency standard for micro-grid in island operation mode and to share load power variation. The paper takes inductive equivalent output impedance as an example, analyzing its influence mechanism to power distribution and the limitations of traditional drooping control method. Directing at the multi-loop feedback controller structure containing voltage and current loop, by constituting integrators, redesigning equivalent output impedance, removing the balance relationship between reactive power control and equivalent output impedance, the improved drooping controller possesses strong robustness ability in application of micro source parallel system with different capacities, which increased load power distribution precision as well as reduced system circulation effectively. PQ controller which is suitable for voltage source inverter has been devised, ensuring that micro source output power is equal to the reference value. Multi-inverter interface micro-grid simulation platform adopted the above improved drooping controller and PQ controller is structured for subsequent chapters analysis.
3.According to topology structure, output characteristics, network structure and load characteristics of micro-sources with inverters, comprehensive power quality control measures haves been presented in active and passive control aspects directing at special power quality problems in micro-grid. In the active control direction, inverter control method with harmonic suppression and reactive power compensation function has been put forward. Active power can be sent out while harmonic generated by nonlinear load and reactive power can compensated according to scheduling instruction. Meanwhile, power quality of grid-connected node can be guaranteed at high level. Following operation characteristic of synchronous generator in power grid, micro-grid inverter controller based on a virtual synchronous generator technology has been described. Moreover, contrasting with traditional power drooping control method, the paper analyzes its advantages in the way of suppressing circulation. Output voltage waveform of three-phase four-wire micro-grid inverter is affected by grid distortion voltage, harmonic current of load and neutral-point voltage balance at dc side jointly. In order to maintain neutral-point voltage stable and to make output voltage waveform tracking reference voltage, the paper has set up model according to a four-bridge arm inverter structure and proposed four-bridge arm inverter high quality grid-connected H-oocontrol method for three-phase four wire micro-grid. High bandwidth, wide robust controller has been built to control neutral bridge arm and three-phase bridge arm unified. The four-bridge arm inverter could overcome various kinds of disturbance factors under the large neutral current or grid voltage distortion conditions, which could improve micro-grid power quality. Improved PQ control methods under voltage unbalance conditions of power grid have been proposed. Feed-forward decoupling PQ control based on balance assumption is a typical micro-grid control strategy. By carrying out power analysis on the above control strategy and taking advantage of switch function method to analyze output performance of grid-connected inverter, the output of inverter would contain3th order harmonic and negative sequence component based on balance assumption control strategy under voltage unbalance condition. On the basis of the original PQ control structure, negative sequence voltage control loop has been imposed to offset negative sequence components in power grid voltage. Thereby, three-phase balance can be maintained. Furthermore,3th order harmonic component output could be reduced by the modified switch function modulation method.
4、Based on the proposed micro-grid control structure, transient characteristics simulation analysis under various working conditions has been carried out. The paper analyzes and simulates the transient stability influence caused by typical induction motor load, power supply quality level at special moment when micro-grid change the operation mode, the impacts on micro-grid power supply when remove load or micro source purposely, micro-grid transient response process when change micro source output power and special power quality problem induced by unbalanced load or nonlinear load. The paper analyzes the dynamic process of micro-grid connecting to distribution grid in detail, compares the role of inverter interface micro source with rotating machine interface micro source in supporting distribution grid power and assisting passing through voltage breakdown process.
5、An integrated management platform including micro-grid, distributed generation and power quality control equipments has been presented. Grid structure as well as communication mode with its constraint condition based on multi-agent system have been introduced. The paper raised the network topology consisting of core layer, convergence layer, access layer and foreign service layer. In the examples, micro-grid combined with DSTATCOM operation system as well as inverter interface micro-source combined with static var compensator (SVC) operation system have been proposed. Besides, the mutual interaction mechanism and coupling relation in control field between power quality management equipment equipped with the same topological structure as inverters and micro-sources, as well as the effect that power quality control equipment performed in the aspect of suppressing micro-grid voltage fluctuation, assisting low-voltage crossing and compensating reactive power have all been studied in detail.
The paper discusses multi-inverter interface micro-grid operation and control methods as well as management methods on some special power quality problems. A new micro-grid control structure based on improved drooping control methods and PQ control has been presented chiefly. Besides, micro-grid power quality management scheme combined with active and passive control has been put forward. According to compound control methods on special power quality problems of inverter interface micro-grid, transient simulations of multi-inverter interface micro-grid under various working conditions have been completed. Furthermore, the paper set up integrated management platform including distributed generation, micro-grid and power quality control equipments from theory to method, then to simulation. Coordination of centralized control platform could strengthen the control ability of micro-grid power and promote the level of power quality. The research results can be applied in such occasions as large photovoltaic power station, roof power station, intelligent distribution network, agricultural distribution network, new energy and especially multi-group parallel inverters.
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