A Complex Variable Based Control Algorithm for Energy Storage Inverter and Off-grid Seamless Switching
An energy storage inverter and seamless switching technology, which is applied in the energy industry, AC network circuits, single-network parallel feeding arrangements, etc., can solve problems affecting the safe and stable operation of micro-grids, and achieve simplified switching control timing, good Dynamic performance, effect of short switching transition times
Active Publication Date: 2018-10-23
SOUTHEAST UNIV
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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.
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[0033] The specific embodiments of the present invention will be further described below in conjunction with the drawings.
[0034] The invention discloses a seamless switching control algorithm for an energy storage inverter based on a complex variable to connect and off the grid.
[0035] The present invention includes the following specific steps:
[0036] (1) In the αβ coordinate system, based on the theory of instantaneous reactive power, 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. , Grid voltage, observed grid voltage fundamental wave positive sequence output signal, auxiliary state variables, control input signal and other variables, connect the frequency-locked loop module and voltage and current control modules in series to form an organic whole, design seamless...
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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 seamless switching control of micro-grid, in particular to a seamless switching control algorithm for an energy storage inverter based on complex variables and off-grid. Background technique [0002] Two basic operation modes of microgrid: grid-connected (GC) and stand-alone (SA) seamless switching control is the key technology to ensure uninterrupted power supply for critical loads. The seamless switching control algorithm mostly adopts the method of control mode switching, which is prone to over-voltage 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 that the microgrid ...
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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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