Inverter grid-connected control method based on virtual synchronous generator technology

A virtual synchronization and control method technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as unfavorable frequency stability, increased control complexity, active power output errors, etc., to achieve stability and avoid power grid Effects of Frequency Offset, Simplified Control Structure

Inactive Publication Date: 2015-04-29
XI AN JIAOTONG UNIV +3
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AI Technical Summary

Problems solved by technology

[0004] The existing virtual synchronous generator control methods all need to design a phase-locked loop to detect the grid frequency to realize the damping torque and active power-frequency droop control, which increases the control complexity.

Method used

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  • Inverter grid-connected control method based on virtual synchronous generator technology
  • Inverter grid-connected control method based on virtual synchronous generator technology
  • Inverter grid-connected control method based on virtual synchronous generator technology

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with specific examples, which are explanations of the present invention rather than limitations.

[0049] see figure 1 , is the main circuit of the virtual synchronous generator (VSG), and the inverter is connected to the grid through an inductor.

[0050] see figure 2 , is the schematic diagram of active power control, in which M ref is the electromagnetic torque reference value, M el is the VSG electromagnetic torque feedback, J is the virtual moment of inertia; w, VSG angular frequency and angular frequency acceleration respectively; K d , T d Respectively, damping coefficient and time constant; θ is VSG phase angle. see image 3 , is its small signal model, δ is the power angle, E, U are the effective values ​​of VSG port voltage and grid voltage respectively, X L is the filter inductive reactance.

[0051] The inverter grid-connected control method based on virtual synchronous...

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Abstract

The invention discloses an inverter grid-connected control method based on the virtual synchronous generator technology and belongs to the field of distributed power generation system grid-connected researches. According to the technical scheme, the method includes the steps that a grid-connected inverter phase voltage phase value is obtained through calculation by simulating a conventional synchronous generator unit active power control method; a grid-connected inverter phase voltage amplitude value is obtained through calculation by simulating a conventional synchronous generator unit reactive power control method; a three-phase voltage reference value is worked out according to the inverter phase voltage phase value and the inverter phase voltage amplitude value, a three-phase modulated wave is figured out according to direct current side voltage obtained through detection, and the three-phase modulated wave is compared with a carrier wave to obtain six switching signals to control turn-off and turn-on of switching devices in a main circuit. System damping and active power-frequency droop control are achieved by means of control link signals, and power grid frequency does not need to be detected. The method simplifies a control structure and avoids the problems caused by a frequency detection link. Effectiveness of the method is verified through simulation and experiment results.

Description

technical field [0001] The invention belongs to the technical field of grid-connected research on renewable energy and distributed power generation systems, and in particular relates to an inverter grid-connected control method based on virtual synchronous generator technology. Background technique [0002] Since the 1970s, energy and environmental protection have gradually become one of the world's mainstream concerns. With the continuous increase of energy consumption and the continuous reduction of traditional energy sources, the development of new energy has attracted widespread attention and promotion from the whole society. Among them, photovoltaic power generation and wind power generation have the advantages of easy large-scale utilization and low cost, so It has developed rapidly in recent years. [0003] However, based on the existing control methods, the stable operation of new energy power generation equipment depends on the strong power grid, and the large-scal...

Claims

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Application Information

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IPC IPC(8): H02J3/40
CPCH02J3/382H02J3/40
Inventor 刘进军佘洪伟刘增周思展
Owner XI AN JIAOTONG UNIV
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