Research on Control Strategy of Distributed Energy Storage System in Distribution Network with New Energy

doi:10.12204/j.issn.1000-7229.2021.05.009

Abstract

Abstract:

High-proportion integrating of intermittent new energy has a great impact on the stability of distribution network. A control strategy based on double-layer control to improve the voltage stability of distribution network is proposed. The upper-level controls the voltage stabilization to determine the total active/reactive power of the energy storage power station group for each node to meet the voltage safety operation and the minimum voltage deviation. The lower-level control optimizes the distribution of upper-level operation results, and allocates the power of each energy storage power station considering the operation economy of power grid and the utilization rate of new energy. The control process is implemented in multiple time scales, and the operation results are uploaded to the energy storage detection and control module, which finally determines the working mode and power distribution of each energy storage unit according to the real-time status of each energy storage station. IEEE 33-bus system is used to verify the proposed control method. The result of energy storage power distribution is calculated by particle swarm optimization algorithm, which proves the rationality and effectiveness of implementing double-layer control in multiple time-scales.

Key words: energy storage system, double-layer control, multiple time-scale execution, active and reactive coordinated control, voltage stability

CLC Number:

TM734

DONG Xinwei, PEI Chenchen, DENG Wei, LI Bin, DAI Hui. Research on Control Strategy of Distributed Energy Storage System in Distribution Network with New Energy[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(5): 81-89.

Figures/Tables 15

Fig.1 Multiple time-scale frame diagram of double-layer control process

Fig.2 Flow chart of PSO double-layer control algorithm

Fig.3 Diagram of IEEE 33-node simulation system

Fig.4 Comparison of voltage at node 6 with and without energy storage

Fig.5 Comparison of voltage at node 11 with and without energy storage

Fig.6 Comparison of voltage at node 25 with and without energy storage

Fig.7 Active and reactive output of DESS1

Fig.8 Active and reactive output of DESS2

Fig.9 Active and reactive output of DESS3

Fig.10 Charging and discharging power of energy storage power stations

Table 1 Working mode of each energy storage station

Fig.11 Comparison of active power loss rate

Fig.12 Comparison of active power loss before and after energy storage participation

Fig.13 Comparison of new energy consumption rate

Fig.14 Comparison of new energy output loss before and after energy storage participation

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