Hierarchical control for parallel bidirectional power converters of a grid-connected DC microgrid

HU Hui-yong; PENG Yong-gang; XIA Yang-hong; WANG Xiao-ming; WEI Wei; YU Miao

doi:10.1631/FITEE.1601497

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Hierarchical control for parallel bidirectional power converters of a grid-connected DC microgrid

Regular Papers | Updated：2022-06-06

- Hierarchical control for parallel bidirectional power converters of a grid-connected DC microgrid
- 联网型直流微电网并联双向变流器分层控制
- Frontiers of Information Technology & Electronic Engineering Vol. 18, Issue 12, Pages: 2046-2057(2017)
- Affiliations：
  
  College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
- Author bio：
  
  [ "Hui-yong HU, E-mail: huhuiyong@zju.edu.cn" ]
  Yong-gang PENG, E-mail: pengyg@zju.edu.cn
- Funds：
- DOI：10.1631/FITEE.1601497
  CLC： TM91
- Received：24 August 2016，
  
  Revised：2017-12-20，
  
  Published：2017-12
- Accepted：
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HU Hui-yong, PENG Yong-gang, XIA Yang-hong, et al. Hierarchical control for parallel bidirectional power converters of a grid-connected DC microgrid[J]. Frontiers of Information Technology & Electronic Engineering, 2017, 18(12): 2046-2057.
DOI：

HU Hui-yong, PENG Yong-gang, XIA Yang-hong, et al. Hierarchical control for parallel bidirectional power converters of a grid-connected DC microgrid[J]. Frontiers of Information Technology & Electronic Engineering, 2017, 18(12): 2046-2057. DOI： 10.1631/FITEE.1601497.

摘要

直流微电网通过多个双向变流器并联连接到交流电网，其控制方法直接影响到直流电网的性能。目前的研究工作主要集中在交流、直流及混合微电网的分层控制，而较少关注直流微电网互联的双向变流器的分层控制。本文提出一种直流微电网联网双向变流器的分层控制方法。为抑制交流测零序环流并实现电压控制的反馈线性化，采用

-0控制策略来控制内环电流并采用直流电压平方实现外环电压控制。在一次控制阶段采用直流电压下垂控制来实现直流电流的分担，直流电压下垂控制会产生直流电压偏差。接着分析了直流电压偏差和电流分担误差之间的关系。为同时消除直流电压偏差和电流分担误差，在二次控制中采用了下垂斜率调节和电压平移。三次控制中通过多双向变流器的精确有功和无功控制实现直流微网的经济运行。本文提出的直流微网多并联双向变流器分层控制方法可以实现微网内可控/不可控分布式电源的协调。通过Matlab/Simulink仿真验证了算法的有效性，结果表明该算法能满足实际应用需求。

Abstract

The DC microgrid is connected to the AC utility by parallel bidirectional power converters (BPCs) to import/export large power

whose control directly affects the performance of the grid-connected DC microgrid. Much work has focused on the hierarchical control of the DC

and hybrid microgrids

but little has considered the hierarchical control of multiple parallel BPCs that directly connect the DC microgrid to the AC utility. In this paper

we propose a hierarchical control for parallel BPCs of a grid-connected DC microgrid. To suppress the potential zero-sequence circulating current in the AC side among the parallel BPCs and realize feedback linearization of the voltage control

d-q

-0 control scheme instead of a conventional

d-q

control scheme is proposed in the inner current loop

and the square of the DC voltage is adopted in the inner voltage loop. DC side droop control is applied to realize DC current sharing among multiple BPCs at the primary control level

and this induces DC bus voltage deviation. The quantified relationship between the current sharing error and DC voltage deviation is derived

indicating that there is a trade-off between the DC voltage deviation and current sharing error. To eliminate the current sharing error and DC voltage deviation simultaneously

slope-adjusting and voltage-shifting approaches are adopted at the secondary control level. The proposed tertiary control realizes precise active and reactive power exchange through parallel BPCs for economical operation. The proposed hierarchical control is applied for parallel BPCs of a grid-connected DC microgrid and can operate coordinately with the control for controllable/uncontrollable distributional generation. The effectiveness of the proposed control method is verified by corresponding simulation tests based on Matlab/Simulink

and the performance of the hierarchical control is evaluated for practical applications.

关键词

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references

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