AC DC micro grid connection flexible serial parallel multifunctional energy controller

An energy controller and multi-functional technology, applied in the field of power system, can solve the problems of uncertain voltage and power quality improvement effect, lack of dynamic voltage recovery ability, main grid supply power and power quality, etc., to achieve rich operation modes, enhanced function, the effect of reducing equipment investment and operating power loss

Inactive Publication Date: 2015-09-16
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The flexible series-parallel multifunctional energy controller of the present invention overcomes the shortcomings of the existing parallel and series-parallel methods, and solves the problem of improving the voltage and power quality of the existing AC-DC microgrid parallel power interface due to the use of a single parallel method Uncertain effect, lack of dynamic voltage recovery capability, and technical problems that cannot provide power and power quality support to the main grid in the island operation mode, and solve the power interface caused by the series-parallel connection of the existing AC-DC micro-grid. Technical and economical problems with high idle and running losses

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  • AC DC micro grid connection flexible serial parallel multifunctional energy controller
  • AC DC micro grid connection flexible serial parallel multifunctional energy controller
  • AC DC micro grid connection flexible serial parallel multifunctional energy controller

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Embodiment Construction

[0026] Structural block diagram of AC-DC micro-grid grid-connected system combined with flexible series-parallel multifunctional energy controller for AC-DC micro-grid figure 1 , The main circuit of the DC / AC converter figure 2 , The main circuit of the AC / AC converter image 3 , the main circuit of the flexible series-parallel conversion circuit Figure 4 The principle structure of solid-state switch K2 in the case of solid-state switch K1, K3, K4, K5 and N-phase N-wire main grid Figure 5 , The principle structure of solid-state switch K2 in the case of N-1 phase N line main grid Figure 6 , The principle structure of capacitor C in the case of N-phase N-line main grid Figure 7 The principle structure of capacitor C in the case of N-1 phase N line main grid Figure 8 , describe the specific embodiment and working process of the present invention.

[0027] see figure 1 , the AC-DC microgrid grid-connected flexible series-parallel multifunctional energy controller syst...

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Abstract

The invention discloses an AC DC micro grid connection flexible serial parallel multifunctional energy controller, whose static topology is composed of a DC / AC converter, an AC / AC converter and a flexible series parallel conversion circuit, wherein the DC / AC converter is composed of a bidirectional BUCK-BOOST chopper circuit and N groups of H-type bridge arm voltage-type inverters; the AC / AC converter adopts a two-stage matrix converter composed of two groups of 2*M switch rectifiers and a group of N H-type bridge arm voltage-type inverters; and the flexible series parallel conversion circuit is composed of solid state switches. According to the flexible serial parallel multifunctional energy controller, on the basis of outer information and instructions, the connection mode between the AC DC micro grid and the main grid and running topology of a power interface can be automatically adjusted, the power interface circuit for the AC DC micro grid connection is simplified, the equipment utilization efficiency is improved, the running power loss is reduced, the power interface performance is enhanced, and high efficiency, economy and reliability are well combined.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to a flexible series-parallel multifunctional energy controller used for grid-connected power interfaces of AC and DC microgrids. Background technique [0002] Distributed generation and load together form a microgrid and the joint operation of the main grid is the most effective way to improve the efficiency of distributed generation. With the development of distributed power generation technology, a large number of AC distributed power sources such as wind power generation, biomass power generation, micro steam turbine power generation and DC distributed power sources such as photovoltaic power generation, super capacitors, batteries, superconducting energy storage, and fuel cells have been widely used in recent years. develop. Combination of AC micro-grid and DC micro-grid The combined operation of AC-DC micro-grid and the main grid can better exert the efficiency of various forms of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02P80/14
Inventor 粟时平刘桂英粟渊恺刘庆锋
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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