On-load tap changer (OLTC) controller for microgrid

A voltage regulating transformer and micro-grid technology, applied in sustainable manufacturing/processing, photovoltaic power generation, wind power generation, etc., can solve problems such as system instability, one-way, paralysis, etc., to improve operational reliability, prolong service life, The effect of reducing maintenance costs

Inactive Publication Date: 2011-07-13
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

[0004] The construction of micro-grid can learn from the successful experience of many traditional distribution networks, but it has many differences from traditional distribution networks. For example, the power flow of

Method used

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  • On-load tap changer (OLTC) controller for microgrid
  • On-load tap changer (OLTC) controller for microgrid
  • On-load tap changer (OLTC) controller for microgrid

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Embodiment Construction

[0021] figure 1 It is a schematic diagram of the topology structure of the microgrid based on the on-load tap changer, where 1 is the distribution network, which is responsible for supplying power to the load when the power supply of the microgrid itself is insufficient. S is a networking switch, which is responsible for the connection and separation of the distribution network and the microgrid. 2 is a non-contact OLTC transformer and its control system. 3 is a photovoltaic power generation unit, which is connected to the micro-grid bus after passing through the inverter device 4 . 6 is a wind power generation unit, which first changes the AC power with unstable frequency into DC power through the rectifier unit 5, and then changes it into AC power with stable frequency through the inverter device 4 and connects it to the bus bar of the micro-grid. 7 is a fuel cell unit, which is also connected to the micro-grid bus after passing through the inverter device 4 . 8 is a stor...

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Abstract

The invention belongs to the field of distributed power generation and smart grid control and relates to a microgrid topology and a corresponding on-load tap changer (OLTC) controller. The invention specifically provides a microgrid topology which can realize smart control of the microgrid comprising solar power generation units, wind power generation units, fuel cells, photovoltaic power generation units, direct current load units, alternating current load units and other units in combination with the contactless OLTC and a control method of the microgrid topology. The implementation process is as follows: the OLTC is utilized to realize connection between the microgrid and a large grid; the advanced smart reactive compensation control method is adopted for the DSP (digital signal processor) controller of the OLTC; and the frequency and voltage in the power quality indexes are used for establishing the joint optimal objective function to realize optimal control of the voltage regulation device OLTC and simultaneously realize optimal control of various power generation units and loads in the smart microgrid. The microgrid topology and corresponding control method provided by the invention have the beneficial effects of achieving static voltage regulation control of any node in the microgrid and realizing adaptive connection between the microgrid and the large grid.

Description

technical field [0001] The invention belongs to the field of distributed power generation and smart grid control, and in particular relates to a microgrid topology and a corresponding on-load voltage regulating transformer controller. Background technique [0002] The concept of microgrid and its related technologies have been researched in many countries in the world at the beginning of this century. Represented by the United States, the European Union and Japan, they are actively promoting microgrid technology and have made some progress. Relevant research institutions in the United States have made important contributions to the concept of microgrids and the development of cogeneration microgrids. The European Union's Fifth and Sixth Framework Programs have conducted research on the concept of microgrids and multi-microgrids and related technologies. The coordinated management scheme of the power grid and the impact of the high penetration rate of the micro-grid on the ...

Claims

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Application Information

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IPC IPC(8): H02J3/04H02J3/38H02J3/18
CPCY02E10/763Y02E10/563Y02E40/30Y02E10/56Y02E10/76Y02P80/14
Inventor 肖朝霞方红伟肖冰
Owner TIANJIN POLYTECHNIC UNIV
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