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Parallel control method for microgrid inverters based on drooping active power curve

A control method and inverter technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as complex calculations and weakened filter effects of notch filters, and achieve good system stability, improve system stability, Design and implement simple effects

Active Publication Date: 2021-06-08
HEFEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 1) A single notch filter can only filter fixed harmonics. To filter multiple harmonics, each notch filter needs to be connected in parallel, and the calculation is more complicated;
[0009] 2) When the inverter output voltage frequency changes, the filtering effect of the notch filter is weakened

Method used

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  • Parallel control method for microgrid inverters based on drooping active power curve
  • Parallel control method for microgrid inverters based on drooping active power curve
  • Parallel control method for microgrid inverters based on drooping active power curve

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Embodiment Construction

[0073] The present embodiment will be specifically described below in conjunction with the accompanying drawings.

[0074] figure 1 It is a parallel system of 2 microgrid inverters with the same capacity, the inverter numbers are #i=1, 2, and the two inverters are connected in parallel to the common connection point (PCC point), U pcc is the common connection point voltage, and the filter inductance of the inverter bridge arm is L i , the inductor current flowing through the bridge arm is I Lai ,I Lbi , the filter capacitor is C i , the inverter output phase voltage at the filter capacitor terminal is E oai ,E obi , the connection impedance between the inverter output terminal and the PCC point is Z Li . The specific parameters are as follows: DC voltage is 600V, rated output line voltage is 380V / 50Hz, bridge arm filter inductance value L i 0.5mH, filter capacitor value C i is 200uF, the wiring impedance Z Li =0.001+j1.25Ω, the rated capacity is 100KVar.

[0075] ...

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Abstract

The invention discloses a micro-grid inverter parallel control method based on drooping active power curve. The method first calculates the instantaneous active and reactive power output by the inverter, and uses a first-order low-pass filter for filtering, and then calculates the active power The curve droop control is performed, and the reactive power is linearly drooped, and the output voltage phase angle and amplitude commands are respectively obtained, and finally the double closed-loop control of the output voltage and the inductor current is performed. The invention enables the inverter parallel system to have the advantages of droop control and better system stability under the conditions of non-linear and unbalanced loads in the isolated island microgrid.

Description

technical field [0001] The invention belongs to the control field of parallel operation of distributed power inverters in island microgrids using droop control, and in particular relates to a parallel control method for microgrid inverters based on drooping active power curves. Background technique [0002] In order to solve the intermittent, fluctuating and uncontrollable problems of distributed energy such as photovoltaics and wind energy, effectively integrate various forms of distributed power and connect them to the grid friendly, microgrid technology has become a research hotspot at home and abroad. Microgrids can operate not only in grid-connected mode, but also in island mode. In a microgrid system composed of multiple distributed power sources, microgrid inverters mostly use droop control based on active power-frequency and reactive power-voltage to provide voltage and frequency support and improve system reliability and redundancy. [0003] Microgrid contains not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/01H02J3/381Y02E40/40
Inventor 徐海珍余畅舟刘淳陈琛余俊杰王庆龙孙强
Owner HEFEI UNIV
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