Research on power control strategy of household-level electric power router based on hybrid energy storage droop control

Kun Huang,Xiaoyan Zhang,Lei Liu,Xin Meng,Yanbin Zhu,Yanman Li

doi:10.1186/s41601-021-00190-2

Kun Huang, Xiaoyan Zhang + Show 4 more

Open Access

https://doi.org/10.1186/s41601-021-00190-2

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Abstract

In the light of user-side energy power control requirements, a power control strategy for a household-level EPR based on HES droop control is proposed, focusing on the on-grid, off-grid and seamless switching process. The system operating states are divided based on the DC bus voltage information with one converter used as a slack terminal to stabilize the DC bus voltage and the other converters as power terminals. In the on-grid mode, the GCC and the HES are used as the main control unit to achieve on-grid stable operation, whereas in the off-grid mode, the PV, HES and LC are used as the main control unit at different voltages to achieve stable operation of the island network. Finally, a DC MG system based on a household-level EPR is developed using the PSCAD / EMTDC simulation platform and the results show that the control strategy can effectively adjust the output of each subunit and maintain the stability of the DC bus voltage.

Highlights

The existing large power grid will remain the main part of the future energy Internet [5, 26]
4 Results and discussions To verify the power control strategy of the householdlevel Electric power router (EPR) based on the Hybrid energy storage (HES) droop control proposed in this paper, a household-based EPR model is built in PSCAD/EMTDC according to the topology shown in
During 0.2 ~ 0.4 s, the DC bus voltage is maintained at 752 V, the HES is used as a slack terminal, and the droop control method is used to charge and discharge to maintain the stability of the bus voltage

Summary

Introduction

The existing large power grid will remain the main part of the future energy Internet [5, 26]. This paper adopts a multi-port routing and transformer power router topology, which achieves the basic requirements such as voltage conversion, reliable electrical isolation, independent port design, and two-way energy flow, and reduces equipment costs, improves efficiency, reduces size, and expands the flexibility of port use [9, 20, 24, 46]. This paper comprehensively considers the operating characteristics of the off-grid operation mode and integrates the converter control strategies into a household-level electric power router.

Household-level electric power router

C ðPPV þ

Scenario 1

Results and discussions

Conclusions