Distributed power system based on DC/AC bidirectional current transformer control

A distributed power supply and bidirectional converter technology, applied in the field of power electronics, can solve problems such as DC bus voltage fluctuations and unfavorable system stable operation

Inactive Publication Date: 2016-10-26
XUCHANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

Usually, when the system is connected to the grid, power fluctuations in the distributed power supply system, photovoltaic output current disturbances, output changes of the hybrid energy storage system, or sudden changes in the output power of the bidirectional DC-AC converter will cause fluctuations in the DC bus voltage. It may even trigger the DC bus voltage protection action, which is not conducive to the stable operation of the system

Method used

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  • Distributed power system based on DC/AC bidirectional current transformer control
  • Distributed power system based on DC/AC bidirectional current transformer control
  • Distributed power system based on DC/AC bidirectional current transformer control

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Embodiment Construction

[0014] In order to enable those skilled in the art of variable flow technology to better understand the solution of the present invention, the implementation of the present invention will be described in detail below with reference to the accompanying drawings.

[0015] see figure 1 , this system provides a distributed power system structure diagram based on DC / AC bidirectional converter control, the system is mainly composed of photovoltaic power generation unit, lithium battery energy storage system, super capacitor energy storage system, DC / DC converter, bidirectional DC / AC converter, DC bus and AC bus. The energy storage unit is composed of lithium battery energy storage and super capacitor energy storage to form a hybrid energy storage system, each of which is connected to the DC bus through a bidirectional DC / DC buck-boost converter, and the DC / DC converter works on the BUCK by controlling the on-off of the switching tube. and BOOST mode to realize bidirectional flow o...

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Abstract

The invention provides a distributed power system based on DC/AC bidirectional current transformer control. Battery super-capacitors are combined for forming a hybrid energy storage unit. A system DC bus is connected through a bidirectional DC-DC current transformer. Grid connection is performed through a bidirectional DC-AC current transformer. A bidirectional DC/AC current transformer DC bus voltage control strategy is designed. A distributed power system structure graph and a bidirectional DC/AC current transformer control structure graph based on DC/AC bidirectional current transformer control are presented. Furthermore through feedforward compensation control, constant DC bus voltage of a DC/AC unit control system is ensured, thereby keeping system energy balance and effectively restraining DC bus voltage surge in the presence of large power disturbance.

Description

[0001] The invention relates to the technical field of power electronics, in particular to the design of a converter system, and is mainly applied to a distributed power generation system. Background technique [0002] The adoption of distributed power generation technology can effectively utilize the abundant clean and renewable energy in various places, and alleviate the energy shortage and environmental problems caused by the increasing consumption of traditional coal, oil and other fossil fuels to a certain extent. The local distributed power generation energy supply system and loads are combined into a microgrid, which is connected to the local power grid as a controllable unit, which can maximize the benefits of distributed power and prevent intermittent power from affecting the power quality of local users. However, due to the randomness and intermittent nature of the power output of the distributed generation unit, it is necessary to use the energy storage system to reg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M3/158H02M7/44
CPCH02J3/385H02M3/1582H02M7/44Y02E10/56Y02E40/10
Inventor 张元敏王武
Owner XUCHANG UNIV
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