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Discrete power generation, energy storage and power supply system cooperative control method

A technology of power supply system and cooperative control, which is applied in the direction of AC network load balancing, single-network parallel feeding arrangement, etc., which can solve the problems of limited controller tracking speed, computer working status, and system failure, etc., to achieve balance and stability Charge and discharge circuit, easy reasoning analysis, discrete control model and simple effect of controller

Active Publication Date: 2020-04-10
中电科蓝天科技股份有限公司
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Problems solved by technology

[0005] In the actual operation of the existing technology, there are boundary characteristics and saturation characteristics in the hardware work, that is, the actual operation is limited by the tracking speed of the controller and the computer work It is difficult to track and give feedback on the charging and discharging status of the battery in real time. According to theoretical analysis and experimental results, it is found that the controller based on the continuous system model will have the following problems:
[0008](2) Frequent saturation causes the system to fail to operate normally;
Considering that the actual power controller is running, due to the hard and soft constraints brought by hardware and software, without considering these constraints, the control input of the controller will inevitably exceed the constraints, causing the system to enter saturation state

Method used

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  • Discrete power generation, energy storage and power supply system cooperative control method
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  • Discrete power generation, energy storage and power supply system cooperative control method

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the drawings and embodiments.

[0040] See Figure 1 to Figure 5 ; A coordinated control method for discrete power generation, energy storage, and power supply systems, including the following steps:

[0041] (1) Discrete controller design,

[0042] The calculation formula of the objective function and constraint conditions, the objective function is:

[0043]

[0044] Where x i Is the state of charge (SOC) of the battery of the i-th power control module, V i Is the internal bus voltage (unit: V), Q i Is the battery capacity (unit: As), P i Is the photovoltaic cell power, u i It is a single-channel external output current. i=1,2,...,N represents the number of the power control module, and T is the sampling period.

[0045] definition I PV =[I PV1 ,I PV2 ,...,I PVN ] T ,among them Then the discrete mathematical model represented by the above formula can be expressed in vector form

[0046] x(k+1)=x(k...

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Abstract

The invention discloses a discrete power generation, energy storage and power supply system cooperative control method, and belongs to the technical field of power generation system management and control. The method is characterized by comprising the following steps of: 1, designing a discrete controller; and 2, carrying out anti-saturation treatment. In the voltage conversion process, the duty ratio is smaller than 100%, and a soft constraint is added to limit the output capability adjustment range of the system. Constraints considered in the design of the control method comprise the following steps: a, constraining of the charging and discharging current of the battery; b, limitation based on SOC (state of charge); c, constraining of the output capability; and d, constraining of the droop coefficient. By the adoption of the technical scheme, the method is mainly applied to hardware control over a power generation-energy storage-power supply system, the operation efficiency of an energy system can be improved, and it is guaranteed that the energy system stably and normally works in the state.

Description

Technical field [0001] The invention belongs to the technical field of power generation system management and control, and particularly relates to a coordinated control method for discrete power generation, energy storage, and power supply systems. Background technique [0002] Energy system management and control technology, power generation-energy storage-power supply is the basic working mode of most grid-connected and island microgrids. This mode is for pure electric energy systems, including but not limited to new energy vehicles, solar aircraft, and new energy industries The most important thing in the entire system is the management and control of the power generation system. Distributed power generation has the advantages of high energy efficiency, low pollution, high reliability, and flexible installation location, but it also has strong output power fluctuations and control Complexity and other deficiencies, control methods are the key to the efficiency of distributed p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/38H02J3/32
Inventor 吕冬翔呼文韬李钏孙子路左志强张志成程晓强曹世卓
Owner 中电科蓝天科技股份有限公司
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