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Cooperative control method that distributed energy storage participates in automatic generation control (AGC)

A technology of automatic power generation control and distributed energy storage, which is applied in the direction of circuit devices, AC network circuits, flexible AC transmission systems, etc., can solve the problems of not being able to reflect the charging and discharging loss well, and the effect is limited.

Active Publication Date: 2017-11-24
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Literature [4] proposes a strategy of reporting base power to dispatch based on the real-time SOC value, but the real-time SOC value is mainly affected by the AGC signal that responds, which cannot reflect the charge and discharge loss well; The average value changes the strategy of the base point power, but the simulation results in this paper show that the effect of this method is limited
[0006] The third issue is the structure of the control system
However, such methods require many iterations to converge

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  • Cooperative control method that distributed energy storage participates in automatic generation control (AGC)

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Embodiment Construction

[0120] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0121] The method in this paper consists of two parts, such as figure 1 Shown. Among them, the external control is the BESS aggregator to determine the total charge and discharge power. The key goal is to maintain the energy balance of the cluster while responding to AGC commands; the internal control is to allocate real-time power within the BESS cluster, and the key goal is to reduce the overall cost.

[0122] 1.1 The total charge and discha...

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Abstract

The invention relates to a cooperative control method that distributed energy storage participates in automatic generation control (AGC). The cooperative control method comprises the steps of: (1), establishing a cluster energy balance feedback control structure based on the SOC of a BESS cluster, and providing two base power calculation methods based on the average equivalent SOC; and (2), establishing a BESS service cost model for charging and discharging loss and battery ageing, and providing a distributed control method, which does not need to be iterated, based on a market mechanism, so that real-time optimal distribution of a control target in the BESS cluster is realized. Compared with the prior art, the distributed BESS is aggregated to participate in the AGC of a power grid; therefore, the system frequency quality can be effectively increased; and in addition, energy storage users can have relatively high earnings by providing a rapid AGC service.

Description

Technical field [0001] The invention relates to a distributed battery energy storage system (BESS), in particular to a coordinated control method in which distributed energy storage participates in automatic power generation control. Background technique [0002] After large-scale renewable energy is connected to the grid, its high volatility increases the grid’s demand for automatic generation control (AGC) ramp rate [1,2] . If only relying on conventional AGC units, unit losses will increase, and the response time of conventional units is close to 1 min [3] , It is difficult to respond to fast AGC signals. The battery energy storage system (BESS) has ms-level response speed and is easy to dispatch. It has great advantages in participating in AGC. For example, (1) In the main power grid, the Federal Energy Regulatory Commission (Federal Energy Regulatory Commission) , FERC) promulgated Act No. 755 in 2011, allowing BESS to participate in the frequency modulation market and obta...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/28
CPCH02J3/28H02J2203/20Y02E40/10
Inventor 程亦直张沛超季珉杰
Owner SHANGHAI JIAO TONG UNIV
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