直流电网建模分析与阻尼控制研究  

Modeling, Analysis and Damping Control of DC Grid

作　　者：李云丰[1] 汤广福 吴亚楠 杨杰 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2](先进输电技术国家重点实验室)全球能源互联网研究院,北京市昌平区102200

出　　处：《中国电机工程学报》2017年第12期3372-3382,共11页Proceedings of the CSEE

基　　金：国家电网公司科技项目(SGRIZLKJ[2015]457)~~

摘　　要：直流电网数学建模是分析直流电网谐振特性和稳定性的基础,对于设计性能优良的阻尼控制器提高直流电网的运行特性具有重大作用。文章首先从换流器平均值模型出发,利用功率平衡原理,推导换流站线性化的戴维南等效模型。其次,考虑直流电网架构在内,建立直流电网的数学模型并研究直流电网的谐振特性和稳定性。再次,通过反馈换流站输出的直流电流,分析功率外环阻尼控制器的实现形式,并设计阻尼控制器的参数。最后,通过搭建的直流电网电磁暂态仿真模型以及RT-LAB实时仿真模型,验证所提阻尼控制策略具有能够有效抑制直流电网谐振电流和提高直流电网运行稳定性的能力。Modeling of the DC grid is the prerequisite for analyzing the resonant characters and stability issues. It is significant to improve the operating characteristics of DC grid by designing a well-performed damping controller. Firstly, a Thévenin＇s model of the converter was derived from the averaged converter model using power-balancing principle. Secondly, the small signal model （SSM） of DC grid was established considering the network frame, and then the resonant characteristics were studied. Thirdly, a power damping control strategy was proposed by feeding back the DC current outputted from the converter. The realization form of damping controller was analyzed and its parameters were designed. Finally, electromagnetic and RT-LAB real-time simulation models were constructed. Both results validate that the proposed damping control strategy can suppress the resonant current in DC grid and improve the operating stability of the system.

关 键 词：直流电网 稳定性 阻尼控制 振荡抑制 戴维南模型 

分 类 号：TM76[电气工程—电力系统及自动化]