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VSG-based grid-connected active support control structure of PMSG

A control structure, active technology, applied in the direction of AC network circuit, single-network parallel feeding arrangement, wind power generation, etc., can solve problems such as control system instability

Inactive Publication Date: 2018-06-19
NORTHEAST DIANLI UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] We can see that no matter what kind of support method is used, the traditional control strategy must use the PLL phase-locked loop to realize the grid-connected operation of the wind turbine, which also makes the control system more unstable when the system voltage fluctuates

Method used

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  • VSG-based grid-connected active support control structure of PMSG
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  • VSG-based grid-connected active support control structure of PMSG

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Embodiment Construction

[0033] In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] The embodiment of the present invention provides a VSG-based PMSG control structure for actively supporting the frequency and voltage of the power grid, including wind turbines and back-to-back four-quadrant converters, and the back-to-back four-quadrant converters include machine-side converters and grid-side converters. Converter, the machine-side converter is used to maintain the voltage of the DC side capacitor; the grid-side converter controls the normal operation of the fan speed and the power balance according to the MPPT algorithm, and uses the VSG control strategy to control the frequency and voltage of the power grid. Active sup...

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Abstract

The invention discloses a VSG(Virtual Synchronous Generator)-based control structure for active supporting of the grid frequency and voltage of a PMSG (Direct Drive Permanent Magnet Synchronous Generator). The control structure is composed of a wind turbine generator and a back-to-back four-quadrant converter. The back-to-back four-quadrant converter consists of a machine-side converter and a grid-side converter; the machine-side converter is used for maintaining the voltage of a direct-current side capacitor; and the grid-side converter is used for controlling normal operation of the rotatingspeed of a draught fan and power balancing based on an MPPT algorithm and carrying out active supporting on the grid frequency and voltage based on a control strategy of the VSG, wherein dynamic support is realized by releasing the energy of the direct-current side capacitor and the kinetic energy of the rotor during supporting. According to the control structure, a defect that grid connection can not be realized until the PPL phase locking is used by the wind turbine generator is overcome. The wind turbine generator is equivalent to a voltage source type VSG to support fluctuation of the grid voltage and frequency.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a VSG-based PMSG grid-connected active support control structure. Background technique [0002] As a clean and renewable energy, wind energy meets the requirements of the environmental protection plan, and the wind power technology industry has developed rapidly around the world. However, due to the randomness and intermittent nature of wind energy, as the proportion of wind power installed capacity in the grid gradually increases, the impact of large-scale wind farms on system stability is gradually increasing. At the same time, frequency changes caused by system load changes will become more severe, which will easily cause the grid to lose stability. [0003] There are three main control strategies in the process of frequency regulation and voltage regulation of wind power participating in the system: [0004] 1. Rotor kinetic energy control [0005] The specific implementation met...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J3/50
CPCH02J3/24H02J3/386H02J3/50H02J2203/20Y02E10/76
Inventor 刘闯杨晓宇何国庆张兴吴绍军李文升安树怀
Owner NORTHEAST DIANLI UNIVERSITY
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