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Improved droop control strategy of low-voltage micro-power grid based on dynamic benchmark

A control strategy, technology of microgrid, applied in a single AC network with different frequencies, AC network voltage regulation, reactive power compensation, etc.

Active Publication Date: 2017-05-24
YANSHAN UNIV
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  • Description
  • Claims
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Problems solved by technology

[0004] The invention provides an improved droop control strategy for low-voltage micro-grid based on dynamic benchmarks, aiming at the frequency fluctuation phenomenon caused by load changes in traditional P-U droop control and the power sharing problem affected by line impedance

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  • Improved droop control strategy of low-voltage micro-power grid based on dynamic benchmark
  • Improved droop control strategy of low-voltage micro-power grid based on dynamic benchmark
  • Improved droop control strategy of low-voltage micro-power grid based on dynamic benchmark

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Embodiment Construction

[0077] The present invention will be further described below in conjunction with accompanying drawing:

[0078] The strategy of the present invention is: to design the real-time frequency reference value according to the real-time change of reactive load, so as to ensure that the fluctuation of the frequency with the load change is relatively small; to design the real-time Based on the principle of the voltage reference value, the active power droop coefficient is improved, and the active power equalization can be kept accurate under the condition that the output voltage of each micro-source is different.

[0079] The specific content is as follows:

[0080] Step 1, designing the real-time value of the dynamic frequency reference in Q-f control;

[0081] like figure 1 As shown, the dynamic frequency reference value is drawn up according to the reactive power distribution of the micro-source, that is, the size of the frequency reference value depends on the load, so as to com...

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Abstract

The invention discloses an improved droop control strategy of a low-voltage micro-power grid based on a dynamic benchmark. A value of a middle-frequency benchmark in P-U droop control is constructed according to changes of an active load so that frequency fluctuation of the micro-power grid is compensated; a reactive droop coefficient is improved based on a principle of constructing a voltage benchmark value in Q-f droop control is constructed based on the changes of a reactive load, and reactive equalization of a micro-source is improved, wherein a dynamic frequency benchmark in the Q-f droop control is obtained by adding a frequency deviation amount caused by changes of the loads to a rated value; under the condition that reactive output of the micro-source is hardly influenced, frequency adjustment of reactive power requirements at different load sides is adapted and error adjustment of frequency is realized, so that the stability of the frequency is improved; a dynamic voltage benchmark in the P-U droop control is obtained by adding a voltage drop value of each micro-source line to a rated value, and control is simplified; the dynamic voltage benchmark is equivalently replaced by improved droop coefficient, and active equalization can still keep accurate under the condition that output voltage of each h micro-source is different.

Description

technical field [0001] The invention relates to the field of smart grid control, in particular to a design method of an improved droop control strategy for a low-voltage micro-grid based on a dynamic reference and a control system thereof. Background technique [0002] With the continuous penetration of new energy and renewable energy power generation, in order to effectively solve many problems caused by the large-scale grid-connected state of distributed power generation and give full play to its potential, a micro-grid has been produced in the field of distributed power generation technology. The microgrid integrates various types of renewable energy such as photovoltaic power generation and wind power generation in the form of micro-sources, which improves the efficiency of resource use and better coordinates various micro-sources through cogeneration. As one of the control methods widely applicable to inverters in microgrids, the droop control method can realize the plu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/02H02J3/16
CPCH02J3/02H02J3/16Y02E40/30
Inventor 窦春霞张占强岳东高含笑
Owner YANSHAN UNIV
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