Wind-solar-diesel storage isolated microgrid system and control method thereof

A technology of wind and diesel storage and control methods, which is applied in photovoltaic power generation, wind power generation, wind turbines, etc., can solve the difficulty of effective control of battery charge and discharge current due to the uncertainty of power transmission, and the difficulty in meeting the long-term stable operation of isolated microgrid systems Needs, impact on battery life and other issues, to achieve the effect of ensuring long-term stable operation, reducing the number of charge and discharge switching, and preventing frequent start and stop

Active Publication Date: 2011-08-17
苏州钧灏电力有限公司
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Problems solved by technology

Since the autonomous power supply system is a combination of multiple energy sources, the fluctuation and uncertainty of power transmission increase the difficulty of effectively controlling the battery charge and discharge curre

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  • Wind-solar-diesel storage isolated microgrid system and control method thereof
  • Wind-solar-diesel storage isolated microgrid system and control method thereof

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Embodiment Construction

[0027] see figure 1 The island micro-grid system proposed by the present invention is composed of lead-acid batteries, one or more sets of photovoltaic cell arrays, one or more small wind power generators, diesel generators, adjustable loads, non-adjustable loads, and micro-grid monitoring subsystems . Lead-acid batteries, photovoltaic cells and diesel generators are integrated into the AC bus using an integrated bidirectional inverter. The inverter is composed of multiple front-stage DC / DC converters, an AC / DC converter and a DC / AC converter. Lead-acid batteries and photovoltaic arrays can be connected to the DC bus through DC / DC converters, diesel generators can be connected to the DC bus through AC / DC converters, and then connected to the AC microgrid through a DC / AC inverter. The DC / DC module connected to the lead-acid battery and the unified DC / AC module can realize the bidirectional flow of electric energy. Small wind turbines using permanent magnet synchronous genera...

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Abstract

The invention belongs to the technical field of distributed power generation microgrid systems in power systems and relates to a wind-solar-diesel storage isolated microgrid system which comprises a lead-acid battery, one group or multiple groups of photovoltaic battery arrays, a fan, a diesel generator, a microgrid monitoring sub-system, a controllable load and an uncontrollable load, wherein the fan comprises more than one wind turbine generator or more than one group of wind turbine generator set, the lead-acid battery and the photovoltaic battery arrays are merged into a direct current bus bar through all front-stage two-way DC (direct current)/DC converters and connected into an alternating current bus bar through a two-way DC/AC (alternating current) inverter, the diesel generator is merged into the direct current bus bar through an AC/DC current converter, the wind turbine generator set is connected into the alternating current bus bar through an AC/DC/AC converter, the microgrid monitoring sub-system is used for controlling voltage and the frequency in a microgrid to be stable. The invention simultaneously provides a coordinated operation control method for the system. Thewind-solar-diesel storage isolated microgrid system has stronger robustness and flexibility, and can meet the long-term high-efficient stable operation requirement of the isolated microgrid system.

Description

technical field [0001] The invention belongs to the technical field of microgrid systems for distributed power generation in electric power systems, and relates to a network structure and a coordinated control method for isolated microgrid systems of wind, diesel and storage. Background technique [0002] Constructing a distributed power generation system in the form of a microgrid to operate independently is the most effective way to solve the problem of power supply in remote areas or remote islands. An isolated microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, loads, monitoring, and protection devices. It is an autonomous system capable of self-control, protection, and management. [0003] In terms of control technology for isolated microgrid systems, two control modes have been proposed at home and abroad: peer-to-peer control mode and master-slave control mode. ...

Claims

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Application Information

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IPC IPC(8): H02J7/35H02N6/00F03D9/00F02B63/04
CPCY02E10/566Y02E10/72Y02E10/56
Inventor 郭力王成山刘梦璇李霞林张野
Owner 苏州钧灏电力有限公司
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