Topology and Control Method of Battery Energy Storage System for Application at the Scale of Hundreds of Megawatts

doi:10.12096/j.2096-4528.pgt.22140

Abstract

Abstract:

With the increasing proportion of new energy in the total installed capacity, the capacity and scale of battery storage power stations are expanding. The improvement of unit capacity of battery energy storage system (BESS) has important engineering practical significance. To explore the BESS topology with more advantages in the face of the development trend of large capacity and large-scale battery storage power stations, the paper first analysed the problems of the traditional centralized BESS and the reasons why the voltage level and capacity of the single machine are limited. Then, the single unit capacity of three kinds of high voltage transformerless BESS was analysed through calculation, i.e. the star structure, triangle structure and modular multilevel structure. After that, the star structure was taken as an example to carry out a detailed study. The topological structure and mathematical model of star structure were introduced, and the basic control strategies of high voltage transformerless BESS were analysed, including the power control at the grid side and state of charge equalization control. The effectiveness of the control strategies was verified by 35 kV/10 MW simulation model. The research results show that the high voltage transformerless BESS has obvious advantages in single machine capacity and capacity expansion, and is more suitable for high-voltage, high-capacity applications.

Key words: battery energy storage system (BESS), star structure, triangular structure, modular multilevel structure

CLC Number:

TK 02

Qing GU, Rui LI, Xu CAI, Baochang XIE. Topology and Control Method of Battery Energy Storage System for Application at the Scale of Hundreds of Megawatts[J]. Power Generation Technology, 2022, 43(5): 698-706.

Figures/Tables 11

Fig. 1 Star structure

Fig. 2 Triangular structure

Fig. 3 MMC structure

Fig. 4 Star structure of high voltage transformerless BESS

Fig. 5 Current decoupling control with phase locked loop

Tab. 1 Simulation parameters

参数

数值

电网线电压有效值V_l/kV

有功功率P₀/MW

模块数量N

滤波电感L_g/mH

寄生电阻R_g/mΩ

滤波电容C_b/mF

开关频率f_s/kHz

0.4

Fig. 6 Waveforms of current decoupling control simulation

Fig. 7 Decomposition of synthetic vector ΔSOC

Fig. 8 Clustered SOC balancing control

Fig. 9 Waveforms of three-phase SOC

Fig. 10 PWM waveform of zero-sequence voltage

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