电力物联网环境下可实现VSG功率环鲁棒解耦的虚拟电感设计  

Virtual Inductance Design for Virtual Synchronous Generator with Robust Power Decoupling Ability

作　　者：高娟 秦岭[1] 许骥 GAO Juan;QIN Ling;XU Ji(College of Electrical Engineering,Nantong University,Nantong 226019,China;Keboda Technology Co.,Ltd.,Technology Center,Shanghai 201203,China)

机构地区：[1]南通大学电气工程学院,江苏南通226019 [2]科博达技术股份有限公司技术中心,上海201203

出　　处：《供用电》2020年第1期37-43,56,共8页Distribution & Utilization

基　　金：国家电网有限公司科技项目（PD71-17-008）~~

摘　　要：智能配电是泛在电力物联网建设应用层的一个重要内容。虚拟同步发电机(virtual synchronous generator,VSG)是提高现行配电网间歇性能源与可变新型负荷接纳能力的一种智能配电装备。在弱电网应用场景下,VSG存在功率环耦合问题,且耦合程度与功角密切相关,会随着电网电压和频率而变化。为了在整个电网运行条件下准确实现功率支撑,需要实现VSG功率环的鲁棒解耦。虚拟电感法是主流的功率解耦方法。为此,文章提出了具有鲁棒解耦能力的虚拟电感设计方法,其可以确保VSG在电网电压和频率可变条件下始终满足解耦条件要求。首先,基于VSG的功率环小信号模型,推导出功率环之间的耦合系数解析表达式;然后,分析了耦合系数与电网电压和频率条件间的关系,提出了功率解耦设计准则,给出了虚拟电感详细设计过程;最后,通过10kVA原理样机对设计方法的正确性进行了Matlab仿真验证。Intelligent power distribution is an important part of the application of ubiquitous power Internet of Things.The virtual synchronous generator(VSG)is a intelligent power distribution equipment that improves the intermittent energy supply and variable load acceptance capability of the existing distribution network.However,under the weak grid condition scenarios,VSG has problem in power loop coupling.Moreover,the coupling degree is closely related to the power angle,which varies with the grid voltage and frequency.In order to accurately implement the power support to the grid under the entire grid operation conditions,it is necessary to accomplish a robust decoupling of the VSG power loop.The virtual inductance control is the mainstream power decoupling method.Hence,a virtual inductor design method with robust decoupling capability was proposed in this paper,which can ensure that the VSG always meets the decoupling requirements under variable grid voltage and frequency conditions.Firstly,the analytical expression of the coupling coefficient between power loops was derived based on the small-signal model of the power loop of the VSG.Then,the relationship between coupling coefficient and grid voltage and frequency was analyzed,and the coupling design criterion was proposed.The design principle of the virtual inductor was given.Finally,the correctness of the proposed design method was verified by Matlab simulation through the 10 kVA principle prototype.

关 键 词：智能配电 泛在电力物联网 虚拟同步发电机 功率解耦 虚拟电感 鲁棒 耦合系数 

分 类 号：TM72[电气工程—电力系统及自动化]