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

A coordinated control system and coordinated control technology, applied in wind power generation, energy storage, charge balancing circuits, etc., can solve problems such as inaccuracy, power grid voltage fluctuations, power supply and demand, etc.

Active Publication Date: 2019-08-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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

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Embodiment Construction

[0089] The invention will be further described below in conjunction with the accompanying drawings and specific implementation examples. A large-scale energy storage SOC balance coordination control system includes: 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 lithium battery boxes;

[0090] One end of the first bus bar is connected to one end of the fourth bus bar, the other end of the first bus bar is connected to one end of the third bus bar, the other end of the third bus bar is connected to one end of the second bus bar, and the other end of the second bus bar is connected to the other end of the fourth bus bar connection; the first busbar and N 1 A lithium battery box is connected, and the second bus is connected to N 2 A lithium battery box is connec...

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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. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02J3/32H02J7/35
CPCH02J7/0014H02J3/32H02J7/35H02J2203/20Y02E70/30Y02E10/56Y02E10/76
Inventor 闫士杰佟诗耕李刚徐伟男张永康
Owner NORTHEASTERN UNIV
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