Energy storage system droop control method used for direct-current power distribution network

Abstract

The invention discloses an energy storage system droop control method used for a direct-current power distribution network. The energy storage system droop control method comprises steady state droop control and transient state inertia control, and comprises the following steps: calculating steady state reference current deviation value delta I0REF1 of steady state droop control, transient state reference current deviation value delta I0REF2 of transient state inertia control, reference current deviation value delta I0REF and actual current reference value I*0REF; subtracting actual current value I0 from the actual current reference value I*0REF to obtain current deviation delta I0, and generating an adjusting signal delta I'0 through a PI control strategy; and carrying out PWM modulation on the adjusting signal delta I'0 to generate a driving signal so as to drive an energy storage bidirectional transducer.

Description

technical field [0001] The invention relates to a droop control method for an energy storage system, in particular to a droop control method for an energy storage system used in a direct current distribution network. Background technique [0002] In recent years, with the rapid development of new energy and power electronics technology, distributed power sources and DC power loads have increased sharply. Traditional AC distribution networks are facing distributed energy access, load diversification, load scheduling and power flow balance coordination and control. a series of issues, etc. Compared with the AC distribution network, the DC distribution network has more superior performance in terms of increasing the power transmission capacity, increasing the controllability of the system, and improving the quality of power supply. The connection of the DC distribution network to the energy storage system can significantly reduce the impact of new energy on the power grid and ...

AI Technical Summary

Problems solved by technology

This method has a better current sharing effect, but due to the existence of interconnection wires, the control difficulty is increased. When the main module in the parallel system fails, the entire system cannot work normally and the reliability is low.

The voltage droop control strategy makes each power supply have its own independent droop relationship curve by setting the droop coefficient, so that the system has good redundancy and scalability, but when the line impedance is too large to be ignored, it will affect the power distribution. accuracy

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