考虑内部动态特性的模块化多电平换流器小信号模型

发布时间：2017-12-31 15:23

本文关键词：考虑内部动态特性的模块化多电平换流器小信号模型　出处：《中国电机工程学报》2016年11期 　论文类型：期刊论文

【摘要】：小信号模型是系统稳定性分析和进行参数设计的重要方法。目前对于模块化多电平换流器(modular multilevel converter,MMC)的小信号建模,通常忽略子模块电容电压波动、内部环流、环流抑制控制器等内部动态行为,从而简化状态空间模型的建立,但却对系统特征根和稳定性分析造成一定误差。文中考虑换流器的内部动态特性,建立了详细的MMC阀的小信号模型,所建立的小信号模型提供与外部控制器和交、直流系统方便的接口,具有较强的通用性。通过与电磁暂态仿真模型的动态响应对比,验证了所提出模型的准确性。同时,建立了简化的端模型的状态空间方程,并将简化模型和MMC详细模型的小信号分析结果进行对比,结果表明,应用简化的端模型评估系统动态特性存在一定误差,且对部分系统不稳定现象无法预估判断,从而验证了建立MMC详细小信号模型的必要性。
[Abstract]:Small-signal model is an important method for system stability analysis and parameter design. At present, modularized multilevel multilevel converter is used for modularized multilevel converter. The small signal modeling of MMCs usually neglects the internal dynamic behavior of submodule capacitor voltage fluctuation, internal circulation, circulation suppression controller and so on, thus simplifies the establishment of the state space model. However, some errors are caused by the characteristic root and stability analysis of the system. Considering the internal dynamic characteristics of the converter, a detailed small-signal model of MMC valve is established. The small signal model provides convenient interface with external controller, AC / DC system, and has strong generality. The dynamic response of the model is compared with that of electromagnetic transient simulation model. The accuracy of the proposed model is verified. At the same time, the state space equation of the simplified end model is established, and the small signal analysis results of the simplified model and the MMC detailed model are compared, the results show that. There are some errors in evaluating the dynamic characteristics of the system by using the simplified end model, and the instability of some systems can not be estimated, which verifies the necessity of establishing the detailed small signal model of MMC.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);曼尼托巴大学;
【基金】：国家863高技术基金项目(2013AA050105) 中央高校基本科研业务费专项资金资助(2014XS03)~~
【分类号】：TM721.1
【正文快照】： 2.曼尼托巴大学,加拿大曼尼托巴温尼伯R3T 5V6)简化状态空间模型的建立,但却对系统特征根和稳定性分析造成一定误差。文中考虑换流器的内部动态特性,建立了详细的MMC阀的小信号模型,所建立的小信号模型提供与外部控制器和交、直流系统方便的接口,具有较强的通用性。通过与电磁

【相似文献】