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Flexible Virtual Synchronous Generator Control for Distributed Generator with Adaptive Inertia

机译：具有自适应惯量的分布式发电机的灵活虚拟同步发电机控制

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摘要

Distributed generators using power electronic converter interface have no inherent inertial response similar to that from the rotating mass of conventional synchronous generators. Virtual synchronous generator (VSG) emulates the behavior of the synchronous generator including system inertia to improve system dynamic performance. Unlike a real synchronous generator, using VSG with proper design, the equivalent inertia of the distributed generator can be controlled in a wider range. In this paper, a flexible virtual synchronous generator (FVSG) control strategy is proposed, with adaptive inertia contributing to a fast and smooth inertial response. The frequency change rate is designed as an adaptive inertia coefficient to flexibly accommodate system inertia with frequency fluctuation rate. Compared with the conventional VSG control, based on fixed inertia coefficient, both inertia support and oscillation suppression are achieved in the proposed control scheme. Moreover, the principles of control parameters design are analyzed in details. Thus, the dynamic response of the system frequency can be substantially improved by the FVSG. Both Matlab/Simulink simulations and prototype tests are implemented to validate the proposed FVSG control strategy on improving system dynamic frequency performance.
机译：使用电力电子转换器接口的分布式发电机没有固有惯性响应，类似于传统同步发电机的旋转质量。虚拟同步发电机（VSG）模拟同步发电机的行为，包括系统惯量，以改善系统动态性能。与真正的同步发电机不同，使用具有适当设计的VSG，可以在更大范围内控制分布式发电机的等效惯量。本文提出了一种灵活的虚拟同步发电机（FVSG）控制策略，其自适应惯性有助于快速，平稳的惯性响应。频率变化率被设计为自适应惯性系数，以灵活地适应具有频率波动率的系统惯性。与常规的VSG控制相比，在固定惯量系数的基础上，该控制方案既实现了惯性支持又实现了振动抑制。此外，详细分析了控制参数设计的原理。因此，FVSG可以大大改善系统频率的动态响应。 Matlab / Simulink仿真和原型测试均得以实施，以验证所提出的FVSG控制策略在改善系统动态频率性能方面的效果。

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