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DC micro-grid secondary voltage regulation method based on optimization control

A DC micro-grid and secondary voltage technology, applied in the field of electric power information, can solve the problems of not being able to obtain the bus voltage at the same time, accurately control the accurate distribution of load current, etc., and achieve the effect of high control accuracy

Pending Publication Date: 2022-01-11
HANGZHOU DIANZI UNIVERSTIY INFORMATION ENG SCHOOL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a DC micro-grid secondary voltage regulation method based on optimal control to solve the technical problem that the existing secondary voltage regulation method cannot simultaneously obtain precise control of bus voltage and accurate distribution of load current

Method used

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  • DC micro-grid secondary voltage regulation method based on optimization control
  • DC micro-grid secondary voltage regulation method based on optimization control
  • DC micro-grid secondary voltage regulation method based on optimization control

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Embodiment

[0076] Such as figure 1 As shown, the DC microgrid system includes 4 DG units, and each DG unit is composed of a DC voltage source and a Boost converter, and is connected to a common DC bus through a DC line. Each DG unit adopts droop control to participate in primary and secondary voltage regulation, and the droop coefficients are 1V / A, 2V / A, 0.6V / A, 1.6V / A; the rated capacity of each DG unit is 2kW, 1kW, 1.5 kW, 1.25kW; the rated voltage of DG busbar and common DC busbar is 200V, and the voltage threshold is 5V; the current distribution coefficient is set according to the capacity of DG unit, which are 0.348, 0.174, 0.261, 0.217 respectively; the current threshold is 0.025; the current weight coefficient is set is 15; public DC bus load R 1 =18Ω, R 2 =90Ω;R 1 To put in the initial run, R 2 Engaged at 2.5 seconds.

[0077] The above-mentioned secondary voltage regulation method is used for simulation, and the waveforms of each bus voltage and the output current of the DG...

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Abstract

The invention belongs to the technical field of electric power information, and discloses a DC micro-grid secondary voltage regulation method based on optimization control. A DC micro-grid system comprises a DG unit, a DC line, a common DC bus and a DC load. Each DG unit is composed of a direct-current power supply and a Boost type converter, and each DG unit is connected with only one DG bus and is connected with the common direct-current bus through the direct-current line. The DC load is connected to the common DC bus, the DC micro-grid operates in an isolated island mode and adopts a peer-to-peer control mode, and a droop control strategy is adopted by the DG unit in peer-to-peer control. According to the invention, the voltage reference value of a droop controller of the DG unit is determined through optimization control, the voltage reference value of the droop controller is adjusted, and the voltage control of the DG DC bus and the common DC bus and the distribution of the load current are carried out at the same time. According to the method, the high-precision control of the bus voltage and the accurate distribution of the load current can be globally realized, and the economical efficiency and stability requirements of the micro-grid system operation are met.

Description

technical field [0001] The invention belongs to the technical field of electric power information, and in particular relates to a secondary voltage regulation method of a DC microgrid based on optimal control. Background technique [0002] With the shortage of conventional energy and the increasingly severe environmental problems, renewable energy has gradually attracted people's attention. With its advantages of high efficiency, cleanliness, and strong scalability, microgrid has become one of the effective ways to utilize renewable energy. The AC microgrid is easy to connect to the existing power distribution network; while the DC microgrid is more convenient to supply power to various DC loads, and because there are no problems such as reactive power, frequency synchronization, and harmonics, the DC microgrid can provide higher power quality and operational efficiency. [0003] In order to ensure the stable operation of the DC microgrid, effective energy management is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
CPCH02J1/10
Inventor 肖宏飞叶林飞陈易铁
Owner HANGZHOU DIANZI UNIVERSTIY INFORMATION ENG SCHOOL
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