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Microgrid inverter parallel control method based on active curve droop

A control method and inverter technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve the problems of weakening filter effect of notch filter and complicated calculation

Active Publication Date: 2020-07-17
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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  • Microgrid inverter parallel control method based on active curve droop
  • Microgrid inverter parallel control method based on active curve droop
  • Microgrid inverter parallel control method based on active curve droop

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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 microgrid inverter parallel control method based on active curve droop. The method comprises the following steps: firstly, calculating instantaneous active power and reactivepower output by an inverter, filtering by adopting a first-order low-pass filter, then carrying out curve droop control on the active power, carrying out linear droop control on the reactive power torespectively obtain an output voltage phase angle and an amplitude instruction, and finally carrying out double-closed-loop control on output voltage and inductive current. According to the invention, under the condition that the island microgrid has nonlinear and unbalanced loads, the inverter parallel system has the advantages of droop control and better system stability.

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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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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