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Three-phase imbalance treatment method based on charging and discharging of energy storage system and related device

An energy storage system, charge and discharge technology, applied in the direction of multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, AC network load balancing, etc., can solve the lack of pertinence, lack of reliability and stability in the governance process Sex and other issues, to ensure the effect of reliability and stability

Pending Publication Date: 2022-05-27
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0004] This application provides a three-phase unbalance treatment method based on the charge and discharge of the energy storage system and related devices, which are used to solve the situation that the existing three-phase unbalance treatment process based on the charge and discharge of the energy storage system is too simple and lacks pertinence, resulting in Technical issues of lack of reliability and stability in the governance process

Method used

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  • Three-phase imbalance treatment method based on charging and discharging of energy storage system and related device
  • Three-phase imbalance treatment method based on charging and discharging of energy storage system and related device
  • Three-phase imbalance treatment method based on charging and discharging of energy storage system and related device

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Embodiment 1

[0053] For ease of understanding, see figure 1 , Embodiment 1 of the three-phase imbalance treatment method based on the charging and discharging of the energy storage system provided by this application includes:

[0054] Step 101: Obtain the three-phase voltage and battery SOC of the transformer in the distribution network station area.

[0055] The three-phase voltage refers to the phase voltage value of the AC side of the transformer at a certain moment, such as the current moment; the battery SOC is the state of charge, which represents the percentage of the remaining available battery capacity to the total capacity, which is one of the most important states in the battery management system.

[0056] For clarification, see Figure 4 The embodiment of this application is aimed at the three-phase unbalance treatment of the energy storage system in the distribution network station area. The system mainly includes the energy storage incoming circuit breaker, the energy stora...

Embodiment 2

[0068] For ease of understanding, see figure 2 , the present application provides the second embodiment of the three-phase imbalance treatment method based on the charging and discharging of the energy storage system, including:

[0069] Step 201: Acquire the three-phase voltage and battery SOC of the transformer in the distribution network station area.

[0070] Step 202: Add the three-phase reactive power measurement value of the transformer in the distribution network station area at the current moment and the three-phase reactive power of the energy storage converter to obtain a three-phase reactive load.

[0071] If the current time is t, the measured value of the three-phase reactive power of the transformer in the distribution network station area is expressed as The three-phase reactive power of the energy storage converter is expressed as Q D· (t), the three-phase reactive load can be expressed as Then the specific calculation formula is:

[0072]

[0073] I...

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Abstract

The invention discloses a three-phase imbalance treatment method based on charging and discharging of an energy storage system and a related device. The method comprises the following steps: acquiring a three-phase voltage and a battery SOC (State of Charge) of a transformer in a power distribution network area; reactive regulation power is calculated according to the three-phase reactive load and a preset reactive reference value; judging whether the transformer in the power distribution network area is overloaded or not according to the maximum load current, and if yes, calculating overload discharge active regulation power based on the three-phase voltage; if the transformer in the power distribution network area is not overloaded, light-load charging and discharging judgment is carried out according to a battery SOC and a threshold judgment rule, and light-load discharging active regulation power and light-load charging active regulation power are calculated respectively; and performing three-phase imbalance adjustment operation according to the PCS reactive power adjustment power, the overload discharge active power adjustment power, the light load discharge active power adjustment power and the light load charge active power adjustment power. The technical problem that the treatment process is lack of reliability and stability due to the fact that conditions considered in the prior art are too simple and lack of pertinence can be solved.

Description

technical field [0001] The present application relates to the technical field of electric energy storage, and in particular, to a three-phase imbalance treatment method and related devices based on the charging and discharging of an energy storage system. Background technique [0002] The main functions of the energy storage system in the distribution station area are peak shaving and valley filling, and power quality control. It is usually installed near a transformer in a certain station area of ​​the distribution network. Specifically, it can be used to deal with problems such as three-phase imbalance and transformer overload. For areas with three-phase unbalance and heavy load, the management process of energy storage system is particularly complicated. [0003] At present, the three-phase imbalance control in the distribution station area is mainly realized by the discharge of the energy storage system, and charging starts when the system is at a low point. This method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02J3/50H02J3/48H02J3/32
CPCH02J3/26H02J3/50H02J3/48H02J3/32Y02E40/50
Inventor 万文军窦子睿钟国彬易斌谢杭璇
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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