Power distribution method under low-voltage alternating-current microgrid island mode

A distribution method and island mode technology, applied in the direction of reducing/preventing power oscillation, single network parallel feeding arrangement, etc., can solve problems such as power distribution accuracy drop, bus voltage drop, etc.

Inactive Publication Date: 2020-03-17
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

[0005] Aiming at a series of problems caused by the droop control strategy, such as power distribution accuracy drop and bus voltage drop, the present invention proposes an isolated island micro-grid power distribution method under the topology structure of multiple distributed power sources connected in parallel for low-voltage AC micro-grid. By introducing an improved particle swarm optimization algorithm and dynamically adjusting the droop coefficient in the droop controller, the real-time optimization of the traditional droop control is realized, so that each distributed power source in the microgrid can output active and reactive power reasonably according to its own capacity power, while maintaining the stability of the bus voltage and system frequency, and realizing the balanced distribution of power in the island mode of the low-voltage microgrid with multiple distributed power sources connected in parallel

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  • Power distribution method under low-voltage alternating-current microgrid island mode
  • Power distribution method under low-voltage alternating-current microgrid island mode
  • Power distribution method under low-voltage alternating-current microgrid island mode

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Embodiment

[0138] attached figure 1 is the schematic diagram of the power distribution method, and the control system consists of a DC voltage source, a three-phase voltage source inverter, an LC filter, an inductor, a PCC bus and a droop control module. Aiming at the problems of low power distribution accuracy and large voltage deviation caused by unbalanced line parameters and local loads in traditional droop control, the IPSO algorithm proposed above is applied to the droop controller. Among them, multiple DGs are connected in parallel in the microgrid, and the droop controller provides control signals for the inverter. Using this control method, the IPSO module and the droop control module can realize real-time interaction between different information. Since the improved droop control structure needs to transmit global and local information between different DGs, it is necessary to establish a corresponding communication mechanism.

[0139] In order to simplify the structure of the...

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Abstract

The invention discloses a power distribution method of a low-voltage alternating-current microgrid. The method comprises the steps of based on the traditional droop control, establishing a micro-gridstructure comprising a plurality of distributed power supplies connected in parallel; introducing an improved particle swarm algorithm, and dynamically adjusting a droop coefficient in a droop controller, so that the real-time optimization of the traditional droop control is realized, further each distributed power supply in the microgrid can reasonably output the active power and the reactive power according to the own capacity, the active and reactive power distribution precision can be effectively improved, meanwhile, the stability of voltage and frequency is kept under different working conditions, and the dynamic performance and transient stability of the microgrid are effectively improved. The method has the advantages of being scientific and reasonable, being high in applicabilityand accurate in control and the like.

Description

technical field [0001] The invention relates to the technical field of low-voltage AC micro-grids, in particular to a power distribution method for low-voltage AC micro-grids in an island mode. Background technique [0002] In the case of close demand on the power consumption side, distributed power generation has the advantages of small transmission loss and high energy utilization rate compared with centralized power generation. Microgrid is a small power generation and distribution system composed of distributed power sources, power loads, power distribution facilities, monitoring and protection devices, etc. It is an effective way to maximize the efficiency of distributed power generation and has important social and economic significance. [0003] According to the structure, the microgrid can be divided into DC microgrid, AC microgrid and AC-DC hybrid microgrid, which have two operating modes: island and grid-connected. The control methods of microgrid are divided into...

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Application Information

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IPC IPC(8): H02J3/46H02J3/24
CPCH02J3/24H02J3/46
Inventor 张良郑昊吕玲池圣斌陈康蔡国伟
Owner NORTHEAST DIANLI UNIVERSITY
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