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A secondary control method without interconnection wires for parallel inverters in a microgrid

A secondary control and inverter technology, applied in reactive power compensation, AC network voltage adjustment, single network parallel feeding arrangement, etc., can solve the problems of high requirements and limited power capacity of the main inverter, and achieve Effect of restoring system frequency and voltage amplitude, good reference value, and eliminating deviation of frequency and voltage amplitude

Active Publication Date: 2017-04-26
东开数科(山东)产业园有限公司
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Problems solved by technology

However, this method has high requirements on the power capacity of the main inverter, which is limited in practical engineering applications.

Method used

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  • A secondary control method without interconnection wires for parallel inverters in a microgrid
  • A secondary control method without interconnection wires for parallel inverters in a microgrid
  • A secondary control method without interconnection wires for parallel inverters in a microgrid

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Embodiment Construction

[0060] The present invention will be further described in detail below in conjunction with specific embodiments, which are for explanation rather than limitation of the present invention.

[0061] The present invention provides a new secondary control method aimed at eliminating the deviation of frequency and voltage amplitude of droop control inverter in microgrid, with reference to figure 1 with figure 2 , figure 2 Take the increase of active load as an example to show the system adjustment process. Before the load changes, the steady-state operating points of the master-slave inverter are as follows: figure 2 As shown in (a); when the active load increases, the system frequency decreases, and the working status of the master-slave inverter before the secondary control starts is as follows figure 2 As shown in (b); when the secondary control is turned on, the active power output from the inverter increases and the system frequency returns to the rated value. The steady-state ...

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Abstract

The invention discloses an interconnection line-free secondary control method of parallel inverters in a micro grid and belongs to the coordinated control field of parallel inverters in a micro grid. According to the method of the invention, the inverters monitor the frequency and voltage amplitude of a system in real time; when the deviation of the frequency or voltage is large, the inverters estimate the power requirement of a load and load power which is required to be borne by the inverters in an on-line manner according to monitored frequency and voltage information, and then calculate new droop characteristics; and therefore, the inverters can automatically adjust the deviation of the droop characteristics of the inverters, and the output power of the inverters can be changed, and the recovery of the frequency and voltage amplitude of the system can be facilitated, and the deviation of the frequency and voltage amplitude caused by droop control can be effectively eliminated. The method does not depend on communication between the inverters. With the method adopted, accurate control on the frequency and voltage amplitude can be realized, and at the same time, equipartition of load power, which is in direct proportion to the capacity of the inverters, can be obtained between the inverters, and excellent references can be provided for engineering application.

Description

Technical field [0001] The invention belongs to the field of coordinated control of parallel inverters in a microgrid, and specifically relates to a secondary control method for parallel inverters in a microgrid without interconnection. Background technique [0002] With the deepening of the environmental and energy crisis, the concept of microgrid has received more and more attention and applications. Microgrid is an energy system that combines distributed power sources and interconnected loads. In most cases, the microgrid is connected to the bus through a power electronic interface, such as an inverter. Therefore, the coordinated control between parallel inverters is one of the key factors for the stable and efficient operation of the microgrid. [0003] Due to the geographical dispersion of distributed power sources, it is often not a good way to use communication lines to transmit signals between parallel power sources, because it will increase the cost and the noise on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/16
CPCY02E40/30
Inventor 刘进军武腾刘增王施珂刘宝谨
Owner 东开数科(山东)产业园有限公司
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