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A Virtual Synchronous Generator Controller Without Current Feedback

A generator controller, current feedback technology, applied in the direction of AC network voltage adjustment, single grid parallel feeding arrangement, reactive power compensation, etc. power and other issues, to achieve the effect of omitting current feedback and saving construction costs

Inactive Publication Date: 2019-02-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional inverter control strategies cannot provide voltage and frequency support for the microgrid system when multiple inverters are connected to the grid. grid development issues

Method used

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  • A Virtual Synchronous Generator Controller Without Current Feedback
  • A Virtual Synchronous Generator Controller Without Current Feedback
  • A Virtual Synchronous Generator Controller Without Current Feedback

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Experimental program
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specific Embodiment approach

[0045] A specific parameter of the inverter controller involved in the present invention is given below.

[0046] Inverter parameters: three-phase inverter, rated frequency f n =50Hz; rated output power 50kW; rated voltage V ref 380V; rated output power Q set is 0var. The rated DC terminal voltage is 700V. The filter part parameter is L f = 2mH, the corresponding X f = 0.628Ω; R f = 0.1Ω; C f =13μF. Droop coefficient D p =100 000, n q is 0.15, the voltage amplitude gain K a =20. Rotor inertia time constant H=2.

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Abstract

The present invention provides a virtual synchronous generator controller that does not require current feedback, including the following parts: 1). The rotor motion equation is calculated to obtain the virtual angular frequency and phase of the rotor as the angular frequency of the inverter. 2). Voltage control, analog synchronous generator excitation control and reactive voltage droop characteristics to control the output voltage amplitude of the inverter. 3). Inverter output power calculation equation. The reactive power of the inverter and the virtual electromagnetic torque are calculated by using the method of calculating the transmission power of the transmission line. This equation has the characteristic that it can be calculated without the need for electric current. 4). The dq transformation and dq inverse transformation unit uses the angular frequency and phase calculated by the rotor motion equation as a reference phase angle. Combining the above parts, a virtual synchronous generator controller without current feedback is obtained in the present invention. Compared with the existing method, the present invention does not require current feedback, which simplifies the control algorithm; meanwhile, the current sensor is omitted, and the construction cost of the inverter is reduced.

Description

technical field [0001] The invention relates to the field of micro-grid and distributed power generation, in particular to a virtual synchronous generator controller of an inverter. Background technique [0002] With the increasing proportion of intermittent clean energy such as wind and light in the power system, smart grids, especially microgrids, have become research hotspots in the power field. The inverter in the microgrid is the main way for clean energy to be connected to the grid, so its control strategy has become a key technology for the operation of the microgrid. Conventional inverter control strategies cannot provide voltage and frequency support for the microgrid system when multiple inverters are connected to the grid. grid development issues. Synchronous generators in traditional power systems have the characteristics of voltage regulation and frequency regulation, and the characteristics of rotor inertia for power regulation during multi-machine operation....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46H02J3/16
CPCH02J3/16H02J3/46Y02E40/30
Inventor 张昌华杨文龙刘憶陈昕廖丽吴云峰陈树恒刘群英
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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