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Virtual synchronous generator controller without using current feedback

A generator controller and current feedback technology, which is applied in the direction of AC network voltage adjustment, single-network parallel feed arrangement, reactive power compensation, etc., can solve the problem that the microgrid system cannot provide voltage and frequency support, and it is difficult for the inverter to output Power and other issues, to achieve the effect of omitting current feedback and saving construction costs

Inactive Publication Date: 2017-05-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • 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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  • Virtual synchronous generator controller without using current feedback
  • Virtual synchronous generator controller without using current feedback
  • Virtual synchronous generator controller without using current feedback

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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 without using current feedback. The virtual synchronous generator controller comprises the following parts of: 1) a rotor motion equation: a virtual rotor angular frequency and phase are obtained through calculation, and the virtual rotor angular frequency is adopted as the angular frequency of an inverter; 2) voltage control: synchronous generator excitation control and reactive voltage drop characteristics are simulated to control the output voltage amplitude of the inverter; 3) an inverter output power calculation equation: a power transmission line transmission power calculation method is adopted to calculate the reactive power and virtual electromagnetic torque of the inverter, wherein the inverter output power calculation equation is characterized in that calculation can be performed with no current quantity required; and 4) a dq transformation unit and a dq inverse transformation unit: and the angular frequency and phase of the rotor motion equation are adopted as a reference phase angle. The above parts are integrated so as to form the virtual synchronous generator controller without using current feedback. Compared with existing methods, the virtual synchronous generator controller without using current feedback of the present invention does not need current feedback, so that a control algorithm can be simplified; and a current sensor is omitted, and the construction cost of the inverter can be 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 Applications(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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