RESEARCH ON CONTROL STRATEGY OF ESS TRANSIENT VOLTAGE SUPPORT BASED ON ADAPTIVE Q-V CHARACTERISTIC
To address the problem of lack of transient voltage support capability of the energy storage systems(ESS),an ESS control strategy considering the adaptive Q-V characteristic of ESS bi-directional operation is proposed.Firstly,the relationship between active power output and adaptive change of reactive power capacity under bi-directional operation of ESS is analyzed theoretically;secondly,an ESS control strategy based on adaptive Q-V characteristic is proposed,which adjusts the reactive power capacity in real time according to the active power output under bi-directional operation of ESS,determines the adaptive Q-V coefficient from the reactive power capacity,and the voltage fluctuation amount of PCC is increased by the adaptive Q-V coefficient.Finally,based on simulation analysis of a practical energy storage project in Shandong Province and PSCAD environment,the proposed strategy was verified.The results indicate that this strategy can effectively reduce the voltage transient level under three-phase ground fault and reactive load disturbance,significantly improve the transient voltage support capability of the system,and then improve the transient stability of the energy storage distribution system to ensure safe and reliable operation of the system.
energy storagetransient supportvoltage controladaptive controldroop control
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