Large-scale energy storage SOC balance coordination control system and method

Abstract

The invention provides a large-scale energy storage SOC balance coordination control system and method. The system comprises a first bus, a second bus, a third bus, a fourth bus, at least one photovoltaic power generation unit, at least one wind power generation unit, at least two loads, a first line impedance, a second line impedance, a third line impedance, a fourth line impedance and N lithiumbattery boxes. In order to adjust the charging and discharging power of each battery according to the properties of the batteries with different capacities, the system achieves the purpose that the SOC tends to be consistent, has certain resistance to power grid disturbance caused by frequent load switching, and maintains the stability of each bus voltage. Different reference voltage regulation coefficients are distributed to batteries with different capacities, and the corresponding change ranges are given, thereby achieving the reasonable distribution of the charging and discharging power, reducing the loss of the battery and prolonging the service life of the battery. Meanwhile, the SOC can be kept consistent for a long time through reference adjustment coefficient adjustment when all batteries reach the same SOC.

Description

technical field [0001] The invention belongs to the technical field of coordinated control of large-scale energy storage converters, and in particular relates to a large-scale energy storage SOC balance coordinated control system and method. Background technique [0002] With the continuous deepening of the concept of environmental protection and the serious impact of environmental pollution, various countries hope to use clean energy to replace fossil energy. Therefore, the development of new energy power generation technology has been supported by various countries. New energy power generation (including photovoltaic power generation, wind power generation, etc.) has the characteristics of less pollution and large energy reserves. However, the randomness of photovoltaic and wind power generation causes fluctuations in grid voltage and unequal power supply and demand, requiring a large number of energy storage devices to keep the voltage and frequency of the grid stable. ...

AI Technical Summary

Problems solved by technology

However, the randomness of photovoltaic and wind power generation causes fluctuations in grid voltage and unequal power supply and demand, requiring a large number of energy storage devices to keep the voltage, frequency and other characteristics of the grid stable.

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