虚拟同步发电机技术控制的MMC型固态变压器

doi:10.19912/j.0254-0096.tynxb.2021-0085

摘要/Abstract

摘要： 针对在大容量直流负荷和高渗透率分布式电源接入固态变压器低压侧时,高压并网接口易呈惯量低、阻尼特性差的问题,提出一种虚拟同步发电机技术控制的模块化多电平换流器（MMC）型固态变压器。首先,分析虚拟同步发电机原理并推导MMC与虚拟同步发电机的等效数学模型,并将虚拟同步发电机技术融入到输入级的控制中,使并网接口的惯性与阻尼增强,在输出端功率变化时对上级电网呈现出友好的柔性缓冲能力。其次,为提升MMC型固态变压器对上级电网的频率支撑能力,在低压直流环节配置储能装置,通过改变充放电功率主动响应一次调频。然后,通过输入级的无功控制环节,验证其具备一定的调压能力。最后建立仿真模型验证了所提控制策略的有效性与可行性。

关键词: 分布式发电, 电力电子, 电能质量, 调频, 虚拟同步发电机, 固态变压器

Abstract: When large capacity DC loads and high permeability distributed generation are connected to the low voltage side of the solid state transformer, the high-voltage grid-connected interface tends to exhibit low inertia and poor damping characteristics, which reduces its grid-connection friendliness and operational reliability. To solve this problem, a modular multilevel converter （MMC）-type solid state transformer controlled by virtual synchronous generator technology was proposed. Firstly, the principle of virtual synchronous generator was analyzed, and the equivalent mathematical model of MMC and virtual synchronous generator was deduced, and the virtual synchronous generator technology was integrated into the control strategy of the input stage, which enhances the inertia and damping of the grid-connected interface,presenting a friendly and flexible buffering capability to the upper grid when the power at the output side changes. Secondly, In order to improve the frequency support capacity of the MMC-type solid-state transformer to the upper-level power grid, the energy storage device was configured on the low-voltage DC bus, and the primary frequency control was actively responded by varying the charging and discharging power. Then, through the reactive power control of the input stage, it was verified that it has a certain voltage regulation capability. Finally, a simulation model was built to verify the effectiveness and feasibility of the proposed control strategy.

Key words: distributed power generation, power electronics, power quality, frequency modulation, virtual synchronous generator, solid state transformer

中图分类号:

TM421

杨红品, 袁至, 王维庆, 何山. 虚拟同步发电机技术控制的MMC型固态变压器[J]. 太阳能学报, 2022, 43(9): 478-487.

Yang Hongpin, Yuan Zhi, Wang Weiqing, He Shan. MMC-TYPE SOLID STATE TRANSFORMER CONTROLLED BY VIRTUAL SYNCHRONOUS GENERATOR TECHNOLOGY[J]. Acta Energiae Solaris Sinica, 2022, 43(9): 478-487.

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