Direct-current micro-grid non-communication bus voltage recovery control method
A bus voltage, DC micro-grid technology, applied in parallel operation of DC power supply, load balance in DC network, etc., can solve the problem of power sharing characteristics affecting droop control, different port voltage command compensation values, and inability to compensate for bus voltage drop, etc. problems, to achieve strong flexibility and adaptability, low cost and high reliability
Pending Publication Date: 2022-03-01
XI AN JIAOTONG UNIV
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Problems solved by technology
[0006] 1) It belongs to the communication-based control strategy, which has the problems of high cost, high control complexity and low system reliability;
[0007] 2) The restored amount is the average value of the port voltage of each converter, which cannot compensate for the bus voltage drop caused by line resistance during long-distance transmission;
[0008] 3) The secondary control loop of each parallel converter uses an integrator. When an integral error occurs in the integrator, the compensation value of the port voltage command output by the secondary control loop of the converter will be different, which will affect the power balance of the droop control. Sub-characteristics;
Method used
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[0051] The present invention will be further described below in conjunction with the accompanying drawings.
[0052] The present invention is mainly used in the field of coordinated control of DC microgrids. The main circuit diagram of DC microgrids in the island state is as follows: figure 1 shown. The present invention adopts a unique control structure, including: capacitor voltage control, inductor current control, droop control, secondary control, bus voltage estimation, small signal injection, small signal adjustment, such as figure 2 shown.
[0053] Concrete steps of the present invention are as follows:
[0054] 1) According to the output current i of the converter port o , bus voltage reference Droop coefficient d b with the line resistance estimate r e , to generate the basic port voltage command of the converter through droop control The calculation formula is as follows:
[0055]
[0056] 2) According to the output voltage v of the converter port o , ...
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The invention discloses a direct-current micro-grid non-communication bus voltage recovery control method, which comprises the following steps of: sampling the output voltage and current of each converter port, extracting the voltage and current of an alternating-current small signal, and calculating reactive power generated by the alternating-current small signal; and adjusting the input of a secondary control loop regulator by using reactive power generated by the alternating current small signal, and finally realizing the synchronization of the voltage instruction compensation values of the ports of the converters. The control method provided by the invention does not need communication, has the advantages of low cost, high reliability, low control complexity, high flexibility, high adaptability and the like, and can be used for optimizing the overall control performance of the system.
Description
technical field [0001] The invention belongs to the research field of coordinated control of distributed DC micro-grids, and in particular relates to a DC micro-grid non-communication bus voltage recovery control method. Background technique [0002] With the deepening of environmental problems and energy crisis, smart microgrid technology based on renewable energy such as light energy and wind energy has received more and more attention and application. At this stage, smart microgrids are mainly divided into two categories: AC microgrids and DC microgrids. Among them, DC microgrids have been favored by more and more scholars in recent years because of their simple topology and control strategies. [0003] One of the important goals of DC micro-grid coordinated control is to realize the distribution of the output power of each distributed generation unit in proportion to its rated capacity. Among various control methods, droop control is the most widely used because of its ...
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Login to View More IPC IPC(8): H02J1/14H02J1/10
CPCH02J1/14H02J1/10
Inventor 刘增赵普刘进军
Owner XI AN JIAOTONG UNIV