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Current mode inverting control strategy for inhibiting current harmonic waves and three phase imbalance in micro grid

A technology of inverter control and current harmonics, applied to AC networks to reduce harmonics/ripples, harmonic reduction devices, multi-phase network asymmetry reduction, etc., can solve the problem of synergistic complexity of control strategies and economic decline , additional costs, etc.

Active Publication Date: 2014-12-10
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, due to the particularity of the micro-grid and micro-source structure, the installation of new devices may complicate the coordination of control strategies between devices, and at the same time increase additional costs, reducing economic efficiency

Method used

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  • Current mode inverting control strategy for inhibiting current harmonic waves and three phase imbalance in micro grid
  • Current mode inverting control strategy for inhibiting current harmonic waves and three phase imbalance in micro grid
  • Current mode inverting control strategy for inhibiting current harmonic waves and three phase imbalance in micro grid

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Embodiment Construction

[0057] like figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 Shown, the strategy of the present invention comprises the following steps:

[0058] A current-source inverter control strategy for suppressing current harmonics and three-phase unbalance in a microgrid, comprising the following steps:

[0059] A: Based on the traditional instantaneous power theory, obtain the load harmonic current in the microgrid; the specific steps to obtain the load harmonic current in the microgrid are:

[0060] A1: Measure the instantaneous value of the three-phase current and the instantaneous value of the three-phase voltage in the three-phase circuit of the actual load in the microgrid, and set the instantaneous value of the three-phase current to i a i b i c , the instantaneous value of the three-phase voltage is e a 、e b 、e c ;

[0061] A2: Parker transformation is performed on the instantaneous value of the three-phase current, and the transformation matrix T is:

[0...

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Abstract

The invention discloses a current mode inverting control strategy for inhibiting current harmonic waves and three phase imbalance in a micro grid. The current mode inverting control strategy for inhibiting the current harmonic waves and the three phase imbalance in the micro grid includes: superposing d axis and positive sequence voltage of a load for Park transformation based on a traditional instant power theory so as to measure a harmonic current of the load; obtaining fundamental voltage of the load and fundamental voltage of a micro source inverter output port, which are equal to each other due to the fact that load is connected with a micro source side in parallel; accordingly, adding a micro source power control link based on harmonic detection control, and enabling a detected current signal to contain a power current signal output by a micro source; enabling an inverter output current to track the current signal through current hysteresis control, and thereby meeting output requirements of the micro source, and managing power quality problems in the micro grid.

Description

technical field [0001] The invention relates to the technical field of micro-grid power quality control when the micro-grid is connected to the grid, in particular to a current-type inverter control strategy for suppressing current harmonics and three-phase imbalance in the micro-grid. Background technique [0002] Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads and monitoring and protection devices. Microgrid is an autonomous system that can realize self-control, protection and management. As a complete power system, it relies on its own control and management for energy supply to achieve power balance control, system operation optimization, fault detection and protection, power quality management, etc. function. The power sources in the microgrid are mostly distributed power sources with small capacity, that is, small units with power electronic int...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/26
CPCY02E40/40Y02E40/50
Inventor 李琼林余晓鹏代双寅刘书铭张博唐钰政李庚银周明江劲舟索之闻
Owner STATE GRID CORP OF CHINA
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