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Energy storage inverter grid-connected and stand-alone seamless switching control algorithm based on complex variables

An energy storage inverter and seamless switching technology, applied in the energy industry, AC network circuits, sustainable manufacturing/processing, etc., can solve problems affecting the safe and stable operation of microgrids, simplify switching control sequences, and improve power supply Reliability, effect of short switching transition times

Active Publication Date: 2016-09-28
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Most of the seamless switching control algorithms adopt the method of control mode switching, which is easy to generate overvoltage and inrush current during the switching process, which affects the safe and stable operation of the microgrid.

Method used

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  • Energy storage inverter grid-connected and stand-alone seamless switching control algorithm based on complex variables
  • Energy storage inverter grid-connected and stand-alone seamless switching control algorithm based on complex variables
  • Energy storage inverter grid-connected and stand-alone seamless switching control algorithm based on complex variables

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Embodiment Construction

[0033] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0034] The invention discloses a complex variable-based energy storage inverter seamless switching control algorithm.

[0035] The present invention comprises the following concrete steps:

[0036] (1) In the αβ coordinate system, based on the instantaneous reactive power theory, the inductor current of the energy storage inverter, the reference current of the current controller, the output capacitor voltage of the energy storage inverter, and the reference voltage of the voltage controller are defined in the form of complex variables , the grid voltage, the observed grid voltage fundamental wave positive sequence output signal, auxiliary state variables, control input signals and other variables, the frequency-locked loop module is connected in series with the voltage and current control modules to form an organic whole, and seamless switch...

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Abstract

The invention discloses an energy storage inverter grid-connected and stand-alone seamless switching control algorithm based on complex variables, belonging to the distributed power supply grid-connected control field. The energy storage inverter grid-connected and off-grid seamless switching control algorithm can be applied to large-scale microgrid operation mode seamless switching control, guarantees uninterrupted power supply of key charges and stable operation of the distributed power supply during a switching process, and improves reliability of power supply of the microgrid. The energy storage inverter grid-connected and stand-alone seamless switching control algorithm connects voltage control, current control and a frequency locking ring in series to become an organic integrity and thus a seamless switching control flow is simplified. The energy storage inverter grid-connected and stand-alone seamless switching control algorithm utilizes a dynamic internal mold which has infinite gain and has a polarity selection characteristic at an appointed frequency, designs a frequency locking ring structure having characteristics of a discrete resonator and realizes that the phase of output voltage does not mutate during the process of transferring from the grid-connected operation to the stand-alone operation of the microgrid. The energy storage inverter connected-network and stand-alone seamless switching control algorithm adopts linear secondary type optimal adjustment, designs a unified calculation algorithm for complex control parameters and simplifies a multi-complex-parameter design process.

Description

technical field [0001] The invention relates to the technical field of micro-grid seamless switching control, in particular to a complex variable-based energy storage inverter seamless switching control algorithm. Background technique [0002] The seamless switching control of two basic operation modes of microgrid: grid-connected (GC) and stand-alone (SA) is the key technology to ensure uninterrupted power supply of key loads. Most of the seamless switching control algorithms adopt the method of control mode switching, which is easy to generate overvoltage and inrush current during the switching process, which affects the safe and stable operation of the microgrid. [0003] Relying on the energy storage inverter as the carrier, the seamless switching control algorithm of the microgrid energy storage inverter is designed based on complex variables, and the frequency-locked loop structure with discrete resonator characteristics is used to ensure the continuous output voltage ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/44
CPCH02J3/38H02J3/388H02J3/44Y02P80/14
Inventor 胡敏强倪春花全相军吴在军窦晓波
Owner SOUTHEAST UNIV
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