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Distributed battery energy storage cluster frequency modulation method and device based on demand opportunity constraint

A battery energy storage and distributed technology, applied in circuit devices, electrical components, AC network circuits, etc., can solve problems such as aggravating cluster charging and discharging losses, avoid secondary frequency drop problems, improve computing efficiency, and minimize frequency modulation. The effect of loss

Pending Publication Date: 2022-02-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The method described in Patent No. 3 often leads to power circulation inside the energy storage cluster during the process of uniforming the energy storage quantity, which aggravates the charge and discharge loss of the cluster, and is not suitable for clusters composed of different types of battery energy storage with widely different rated capacities; The above patents only allocate power to the energy storage cluster under the safety goal, and do not fully exploit the economics of energy storage participating in frequency regulation in combination with the uncertainty of power demand

Method used

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  • Distributed battery energy storage cluster frequency modulation method and device based on demand opportunity constraint
  • Distributed battery energy storage cluster frequency modulation method and device based on demand opportunity constraint
  • Distributed battery energy storage cluster frequency modulation method and device based on demand opportunity constraint

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Effect test

Embodiment 1

[0074] like figure 1 As shown, the present invention provides a distributed battery energy storage cluster frequency regulation method based on demand opportunity constraints, including the following steps:

[0075] Step S1, obtaining the high-frequency component of the AGC (Automatic generation control, automatic generation control) power demand in the preset area;

[0076] Step S2, establishing the energy storage frequency modulation loss function and calculating the energy storage operation constraint range;

[0077] Step S3, according to the high-frequency component of AGC power demand and the energy storage operation constraint range, with the goal of minimizing the total frequency regulation loss of battery energy storage in the area, construct a power allocation optimization model that considers energy storage willingness and AGC power demand opportunity constraints;

[0078] Step S4, decomposing the power distribution optimization model into the sum of the battery ene...

Embodiment approach

[0079] As an implementation manner of the embodiment of the present invention, step S1 includes:

[0080] The grid control center obtains the AGC power demand in the area by measuring the real-time frequency of the grid;

[0081] The AGC power demand is preliminarily divided between the unit and the energy storage through the filtering link, and the low frequency component is obtained and high frequency components

[0082] As an implementation manner of the embodiment of the present invention, in step S2, the frequency modulation loss function of the i-th battery energy storage at time t is established as: C i (t)=a i P i (t) 2 +b i P i (t)+c i ; among them, P i (t) is the charging and discharging power of the i-th battery energy storage, P i (t)=P i c(t)-P i d(t), the superscripts c and d represent charging and discharging power respectively, and there is P i c (t)>0 and P i d (t) > 0; a i , b i and c i are the inherent quadratic term, primary term and co...

Embodiment 2

[0124] like Figure 4 As shown, the present invention provides a distributed battery energy storage cluster frequency regulation device based on demand opportunity constraints, including:

[0125] An acquisition module, configured to acquire the high-frequency component of the AGC power demand in the preset area;

[0126] Calculation module, used to establish energy storage frequency modulation loss function and calculate energy storage operation constraint range;

[0127]The building block is used to construct a power allocation optimization model considering the willingness of energy storage and the opportunity constraints of AGC power demand according to the high-frequency component of AGC power demand and the constraint range of energy storage operation, with the goal of minimizing the total frequency regulation loss of battery energy storage in the area ;

[0128] The distribution module is used to transform the power distribution optimization model into the sum of the ...

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Abstract

The invention discloses a distributed battery energy storage cluster frequency modulation method and device based on demand opportunity constraint. The method comprises the steps: introducing an energy storage electric quantity factor by constructing a fuzzy reasoning decision system, so as to adjust the frequency modulation loss of energy storage at different moments, considering the power demand opportunity constraint of automatic generation control (AGC), constructing a battery energy storage cluster optimization power distribution problem modelaiming at minimizing battery energy storage total frequency modulation loss in current and future moments and eliminating battery energy storage cluster tracking errors as far as possible, and finally, iterating state variables alternately through battery energy storage and a control center, and solving the optimal power distribution of the AGC participated by the energy storage of each battery in a parallel mode. According to the method, the frequency secondary drop problem caused by power exhaustion of single energy storage is effectively avoided, the energy storage frequency modulation economy is taken into account while the response precision of the energy storage cluster participating in AGC is effectively ensured, the energy storage local computing power is fully utilized, and the solving efficiency of the optimization problem is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a distributed battery energy storage cluster frequency regulation method and device based on demand opportunity constraints. Background technique [0002] As the proportion of new energy power generation in the power grid continues to increase, the intermittent and random characteristics of its power generation pose risks to the stability of the power grid frequency: a large number of new energy power generation connected to the grid reduces the inertia of the grid and aggravates the grid frequency. The imbalance of active power injected and consumed in real time makes the frequency of the power grid prone to deviation or even instability. Automatic generation control (AGC) is an important mechanism to detect the grid frequency in real time and control the power generation equipment to inject active power into the grid to stabilize the frequency. The tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/32
CPCH02J3/241H02J3/32Y02E40/10
Inventor 张圣祺汪飞严利民刘何毓
Owner SHANGHAI UNIV
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