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Time-sharing coordination control method and system for MPPT operation of PMSG fan

A technology of coordinated control and fan, applied in wind power generation, single grid parallel feeding arrangement, reducing/preventing power oscillation, etc. It can solve problems such as unsatisfactory control effect and power oscillation, avoid power oscillation and reduce loss of wind energy. , the effect of improving utilization

Active Publication Date: 2021-02-09
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

Literature (Li Y, Xu Z, Wong K P.Advanced control strategies of PMSG based windturbines for system inertia support[J].IEEE Transactions on Power Systems, 2017, 32(4):2017.) proposed a method that first uses DC capacitors Electrostatic energy reuses the cascading control of rotor kinetic energy frequency modulation (cascading control), but the control effect is not ideal, because in the process of switching between the two energies, the additional power output by the fan is zero, and it will cause power oscillations

Method used

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  • Time-sharing coordination control method and system for MPPT operation of PMSG fan
  • Time-sharing coordination control method and system for MPPT operation of PMSG fan
  • Time-sharing coordination control method and system for MPPT operation of PMSG fan

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Embodiment 1

[0055] Embodiment 1: A time-sharing coordinated control method when the PMSG fan MPPT is running

[0056] Such as figure 1 As shown, the PMSG wind turbine is connected to the low inertia AC grid system, and the PMSG wind turbine is connected to the power grid through a back-to-back converter. The generator-side converter controls the reactive power and the output power of the fan. The grid-side converter controls the DC voltage and the AC voltage amplitude.

[0057] The electromagnetic power captured by the fan is:

[0058]

[0059]

[0060] In the formula, ρ is the air density, R is the fan blade radius, v w is the wind speed, λ is the tip speed ratio, β is the pitch angle, ω r is the fan rotor speed, C p is the wind energy utilization coefficient of the fan.

[0061] Wind energy utilization coefficient C p Indicates the ratio of the energy captured by the fan per unit time to the total energy carried by the wind energy swept across the surface of the fan blade, ...

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PUM

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Abstract

The invention discloses a time-sharing coordination control method and a time-sharing coordination control system for MPPT operation of a PMSG fan, and relates to the technical field of wind power generation. The main points of the invention are that constant direct-current voltage control of a power grid side converter controls frequency modulation of the PMSG fan according to a direct-current voltage reference value; the fixed power control of the generator side converter controls the frequency modulation of the PMSG fan according to the power reference value after the virtual inertia control of the rotor is added; the fixed power control of the generator side converter controls the PMSG fan to modulate frequency according to the new power reference value after droop control is added; according to the frequency deviation range covered by the DC capacitor virtual inertia control, DC capacitor electrostatic energy participates in frequency adjustment through the DC capacitor virtual inertia control, and rotor kinetic energy participates in the priority of frequency adjustment through the rotor virtual inertia control and the self-adaptive droop control. The wind energy lost by thefan due to participation in frequency adjustment can be reduced, the utilization rate of the wind energy is increased, the wind energy lost by the fan due to frequency modulation is reduced, and time-sharing coordination control is superior to simultaneous coordination control.

Description

technical field [0001] The invention relates to the technical field of wind power generation, more specifically, it relates to a time-sharing coordinated control method and system for PMSG fan MPPT operation. Background technique [0002] Different from synchronous generators, permanent magnet direct-drive wind turbines (permanent magnet synchronous generators, PMSG) are connected to the grid through power electronic converters, and usually adopt synchronous vector control methods based on phase-locked loops, which leads to the speed of wind turbines and grid frequency In a decoupled state, the rotational inertia of the fan rotor is hidden, unable to respond to changes in frequency, and unable to participate in frequency adjustment. And the output power of the variable-speed fan is usually controlled by Maximum Power Point Tracking (MPPT), so it does not have active power backup, and cannot provide frequency regulation services similar to conventional units when the system c...

Claims

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Application Information

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IPC IPC(8): H02J3/48H02J3/38H02J3/24
CPCH02J3/48H02J3/381H02J3/241H02J2300/28Y02E10/76
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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