A Flexible Control Strategy for Energy Storage Assisting Synchronous Generators

doi:10.12204/j.issn.1000-7229.2022.06.011

Abstract

Abstract:

Aiming at the problems of the inertia reduction and reactive power regulation deterioration under the large-scale penetration of renewable energy, a flexible control strategy for energy storage assisting synchronous generators is proposed. Meanwhile, the energy storage is configured at the terminal bus of the synchronous generator, and these two measures form a unified power source: a flexible generator whose equivalent inertia, internal impedance, and damping are changeable. Under the proposed control strategy, the energy storage works in the easy-to-implement current source mode, increasing the inertia and damping of the flexible generator, improving the voltage dynamics, and providing targeted reactive power support in the steady-state. Simulation results verify the effectiveness of the proposed strategy.

Key words: energy storage control, inertia enhancement, voltage dynamics, reactive power support

CLC Number:

TM712

WANG Da, ZHAO Ying, NI Jiahua, LING Yonghui, XIANG Ji, ZHENG Tingting. A Flexible Control Strategy for Energy Storage Assisting Synchronous Generators[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(6): 101-109.

Figures/Tables 14

Fig.1 Constant power control strategy of energy storage system

Fig.2 Flexible control strategy of energy storage system

Fig.3 Simplified model of synchronous generator considering excitation system

Fig.4 Simplified small-signal model of synchronous generator considering excitation system

Fig.5 Simplified small-signal model of flexible generator considering excitation system

Fig.6 Comparison results of active power load increasing

Fig.7 Comparison results of reactive power load increasing

Fig.8 Topology of 39-node power system

Table 1 Parameters of generators

Table 2 Parameters of flexible control

Fig.9 Frequency simulation results of load increasing

Fig.10 Voltage simulation results of load increasing

Fig.11 Frequency simulation results of three-phase ground fault

Fig.12 Voltage simulation results of three-phase ground fault

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