Cascaded microgrid power equal division control method based on self-adaptive virtual capacitor

A virtual capacitor and micro-grid technology, which is applied in the direction of single-network parallel feeding arrangement, can solve the problems of adverse effects of micro-source drooping control effects and uncertain system load information, so as to suppress the impact of the system, reduce performance impact, and expand The effect of stabilizing range

Pending Publication Date: 2019-06-18
CENT SOUTH UNIV +1
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Problems solved by technology

The micro source can be equivalent to an internal resistance Z 0 (s) controlled voltage source G(s)V ref ; but Z load ∠θ load It is the first condition to ensure that the droo

Method used

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  • Cascaded microgrid power equal division control method based on self-adaptive virtual capacitor
  • Cascaded microgrid power equal division control method based on self-adaptive virtual capacitor
  • Cascaded microgrid power equal division control method based on self-adaptive virtual capacitor

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Embodiment 1

[0060] Improved droop control strategy based on virtual capacitance:

[0061] In order to solve the above droop control problem, there are two solutions. One is to change the droop control coefficient to match the load information, but this requires measuring the reactive power in the output power of each inverter. In contrast, it is a more effective way to change the information of the load impedance angle.

[0062] The method of changing the load impedance characteristics to ensure the stability of droop control includes two methods: virtual series inductance and virtual parallel capacitance. For the method of virtual series inductance, the literature [3，4] The proposed virtual impedance method can adjust the equivalent output impedance of the inverter in a larger range. Due to the voltage drop on the virtual impedance in series, the inverter is calculating the voltage drop V of the output current on the virtual impedance. D Then, the voltage command V output from the droop contr...

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Abstract

The invention discloses a cascaded microgrid power equal division control method based on a self-adaptive virtual capacitor; the cascaded microgrid comprises a plurality of inverters, and a parallel virtual capacitor is arranged at the output end of the cascaded microgrid; and the virtual capacitor Cx meets the following formula: the cascaded microgrid power equal division control method based onthe self-adaptive virtual capacitor is beneficial to power equal division and easy to control.

Description

Technical field [0001] The invention relates to a cascaded microgrid power sharing control method based on an adaptive virtual capacitor. Background technique [0002] The so-called droop control is to select the frequency droop characteristic curve (DroopCharacter) similar to the traditional generator as the control method of the micro source, that is, obtain stable frequency and voltage through P / f droop control and Q / V droop control. The control method separately controls the active power and reactive power output by the micro-sources in the micro-grid, without the need for communication coordination between units, and achieves the goal of plug-and-play and peer-to-peer control of the micro-sources, and ensures that the micro-grid in the island The unity of power balance and frequency is simple and reliable. With the increasing demand for energy by human beings, renewable energy and distributed generator (DG) technologies have received extensive attention from scholars at hom...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 于晶荣罗泽陈斌彭铭楷粟梅
Owner CENT SOUTH UNIV
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