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PMSG fan control method based on supercapacitor virtual inertia and short-term primary frequency modulation

A supercapacitor, virtual inertial technology, applied in the control of wind turbines, wind turbines, motors, etc., to prevent rapid falls, improve dynamic characteristics, and strong frequency support

Active Publication Date: 2022-04-29
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing research does not involve whether the fan connected to the supercapacitor can provide virtual inertia and short-term primary frequency regulation under this topology, and it is of great significance to study the primary frequency regulation control provided by the supercapacitor in this case

Method used

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  • PMSG fan control method based on supercapacitor virtual inertia and short-term primary frequency modulation
  • PMSG fan control method based on supercapacitor virtual inertia and short-term primary frequency modulation
  • PMSG fan control method based on supercapacitor virtual inertia and short-term primary frequency modulation

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Embodiment

[0076] Embodiment: PMSG fan control method based on supercapacitor virtual inertia and short-term primary frequency modulation

[0077] like figure 1 As shown, the PMSG fan is connected to the low inertia AC grid system. PMSG wind turbines are connected to the grid through back-to-back converters. The stator side converter (stator side converter, SSC) controls the active power and reactive power output by the fan. The grid side converter (grid side converter, GSC) controls the DC voltage and the amplitude of the AC voltage.

[0078] like figure 2 As shown, the topological diagram of the PMSG fan connected to the supercapacitor (Supercapacitor) can be divided into two types, one is the back-to-back converter where the supercapacitor is connected to the fan through a bidirectional DC / DC converter, and the other is the supercapacitor Direct access to wind turbine back-to-back converters. The first access method needs to add a DC / DC converter. In this way, the supercapacitor...

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Abstract

The invention discloses a PMSG wind turbine control method based on supercapacitor virtual inertia and short-term primary frequency modulation, and relates to the technical field of wind power generation. The main points of the technical scheme are: to simulate the inertia of the power grid with the dynamic power of the supercapacitor directly connected to the back-to-back converter of the wind turbine Response and primary frequency modulation, and calculate the coupling mathematical relationship between DC voltage and AC frequency in the power grid; design and arrange the virtual capacitor and short-term primary frequency modulation controller connected to the PMSG fan connected to the supercapacitor according to the coupling mathematical relationship; measure through the phase-locked loop Frequency information in the power grid, and at the same time calculate the virtual inertia coefficient provided by the super capacitor of the fan according to the coupling mathematical relationship; after calculation, the frequency modulation controller outputs a new DC voltage reference value under the virtual inertia provided by the super capacitor and short-term primary frequency modulation; the constant DC of the GSC The voltage controls the frequency modulation of the PMSG fan according to the DC voltage reference value. The invention can effectively suppress the slope of the frequency change, reduce the transient frequency deviation, and improve the dynamic characteristics of the frequency.

Description

technical field [0001] The present invention relates to the technical field of wind power generation, more specifically, it relates to the PMSG fan control method based on supercapacitor virtual inertia and short-term primary frequency modulation. Background technique [0002] In recent years, the proportion of wind power installed capacity in the grid has been increasing. Different from synchronous generators, permanent magnet direct drive (PMSG) wind turbines are connected to the grid through power electronic converters. In order to capture the maximum wind energy, the output power of wind turbines is usually tracked by maximum power point tracking, MPPT) control, which leads to a decoupling state between the fan speed and the grid frequency, and the rotational inertia of the fan rotor is hidden. [0003] As the proportion of wind power access continues to increase, the inertia of the power system will decrease, which brings serious challenges to the frequency stability a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24H02J3/28F03D7/00
CPCH02J3/381H02J3/241H02J3/28H02J7/345F03D7/00H02J2203/20H02J2300/28H02J2207/50Y02E10/72Y02E10/76
Inventor 曾雪洋李小鹏张纯陈玉敏张华张华杰苏学能
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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