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A data-driven parallel intelligent control method for inverters in microgrid

A technology of data-driven and control methods, applied in electrical components, conversion devices for converting AC power input to DC power output, and output power, etc., and can solve problems such as parameter drift.

Active Publication Date: 2019-03-22
NORTHEASTERN UNIV LIAONING
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of this invention is to overcome the problems of unmodeled dynamics in the traditional inverter parallel control method, that is, parameter drift will occur when there is external interference, and propose a microgrid data-driven inverter parallel control method to Balance load power distribution among individual inverters

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  • A data-driven parallel intelligent control method for inverters in microgrid
  • A data-driven parallel intelligent control method for inverters in microgrid
  • A data-driven parallel intelligent control method for inverters in microgrid

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Embodiment Construction

[0085] The distributed data-driven microgrid inverter parallel intelligent control method proposed by the present invention is applied to the parallel system of three 30kW inverters, such as figure 1 and 2 As shown, the AC bus voltage of the microgrid is 380V, and each inverter controller adopts the proposed data-driven intelligent control method. The control block diagram is shown in image 3 As shown, and all inverters share data through the communication bus. according to Figure 4 and Figure 5 The specific control implementation steps are as follows:

[0086] Step 1. According to the droop control method, the initial value of the control parameters of each inverter is obtained, that is, the modulation wave U in the form of line voltage for generating PWM control pulses ab , U bc , U ca and the output three-phase line voltage E ab ,E bc ,E ca , converted into a digital signal by the A / D sampling module of the DSP chip TMS320F28377D, the sampling frequency is 10kHz...

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Abstract

The invention belongs to the field of microgrid control technology and discloses a parallel intelligent control method of microgrid data-driven inverters. This method overcomes the unmodeled dynamics problems of traditional inverter parallel control methods, that is, parameter drift occurs when there is external interference, to balance the load power distribution between each inverter. At the same time, in view of the shortcomings of the existing modulation technology, the PWM inverter control method of discrete reverse line voltage solution is used to avoid the problem of load imbalance and the midpoint of the DC side voltage cannot be found, thereby achieving even if the load is unbalanced In this case, the equilibrium state can be achieved according to the required line voltage.

Description

technical field [0001] The invention belongs to the technical field of micro-grid control, and in particular relates to a data-driven parallel intelligent control method for inverters in a micro-grid. Background technique [0002] With the development of micro-grid technology, on the one hand, the increase in load requires micro-sources to provide greater output power; on the other hand, due to the relatively scattered distribution of renewable energy, small scale, and discontinuous production, traditional centralized power supply methods These requirements cannot be well met, and the parallel connection of each inverter system can realize power distribution, and has good redundancy and reliability. The problem caused by the parallel connection of inverters is that there will be circulating currents between the inverters, which will reduce the output power quality of the inverters and shorten the life of power electronic devices. [0003] The existing inverter parallel cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387
CPCH02M7/5387
Inventor 闫士杰周建勋高文忠李叶青
Owner NORTHEASTERN UNIV LIAONING