基于虚拟同步发电机的微电网并离网
安全控制策略

发电技术

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基于虚拟同步发电机的微电网并离网安全控制策略

郭亦宗，郭创新

浙江大学电气工程学院，浙江省杭州市 310027

Security Control Strategies of Micro-grid Between Grid-connected and Off-grid Based on Virtual Synchronous Generator

GUO Yizong, GUO Chuangxin

Electrical Engineering College,Zhejiang University, Hangzhou 310027, Zhejiang Province, China

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摘要: 微电网作为综合能源系统的一大分支，广泛用于分布式电源的就地消纳。而随着冷、热、气等逐渐引入，对微电网安全控制的要求也越来越高。针对微电网的孤岛和并网建模及两运行状态之间的过渡过程进行分析，提出了改进虚拟同步发电机(Virtual Synchronous Generator, VSG)模型下的控制策略这一创新模型。引入合适的虚拟阻抗，有效地模拟了同步电抗的特性，保证孤岛运行基本稳定的同时，使得并网至孤岛的切换在该模型下不需要添加额外的控制部分即可完成平滑过渡；孤岛至并网的切换提出了改进型的预同步控制模型，能快速准确地跟踪电网电压幅值、频率以及相位。最终，结合实际算例对所构造的模型在Matlab/Simulink环境下进行仿真，验证了所提模型的正确性及其优势。

关键词 ：微电网, 无缝切换, 虚拟同步发电机(VSG), 虚拟阻抗, 改进预同步控制

Abstract：As a typical integrated energy system, micro-grid is widely used in the local consumption of distributed generation. With the gradual integration of cold, heat and gas, the requirement for safety control of micro-grid is becoming stricter. The grid-connected and off-grid mode of micro-grid and the transition process between them are analyzed, furthermore, a control strategies based on improved virtual synchronous generator model is proposed. By using appropriate virtual impedance, the characteristics of synchronous reactance are effectively simulated, ensuring that the off-grid state is generally stable, and the transition from grid-connected mode to off-grid mode can be achieved smoothly without adding additional controlling parts under this model. An improved pre-synchronization control model is proposed for the switching from off-grid to grid-connected mode, which tracks voltage amplitude, frequency and phase accurately and quickly. Finally, the proposed model in this paper is simulated in Matlab/Simulink a practical example, which verifies the correctness and advantages of the proposed model.

Key words： micro-grid seamless switch virtual synchronous generator (VSG) virtual impedance improved pre-synchronization control

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引用本文:

郭亦宗, 郭创新. 基于虚拟同步发电机的微电网并离网安全控制策略 [J]. 发电技术, .
GUO Yizong, GUO Chuangxin . Security Control Strategies of Micro-grid Between Grid-connected and Off-grid Based on Virtual Synchronous Generator. Power Generation Technology, 0, (): 1-.

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http://www.pgtjournal.com/CN/ 或 http://www.pgtjournal.com/CN/Y0/V/I/1

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