Parameter optimization method for merging wind power plant into VSC-HVDC based on superconducting magnetic energy storage coil

A technology of VSC-HVDC and superconducting magnetic energy storage, which is applied in the field of parameter optimization when wind farms are incorporated into VSC-HVDC. It can solve problems such as frequent fluctuations in DC voltage, inability to accurately determine as required, and inability to stabilize fault currents well. , to achieve the effect of reducing DC power fluctuations

Pending Publication Date: 2020-04-24
STATE GRID GANSU ELECTRIC POWER CORP +3
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  • Abstract
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AI Technical Summary

Problems solved by technology

If parameter optimization is not performed, the initial energy storage of the coil cannot be determined, and the four PI control parameters (K Pi and K Ii ,i=1,2) cannot be accuratel

Method used

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  • Parameter optimization method for merging wind power plant into VSC-HVDC based on superconducting magnetic energy storage coil
  • Parameter optimization method for merging wind power plant into VSC-HVDC based on superconducting magnetic energy storage coil
  • Parameter optimization method for merging wind power plant into VSC-HVDC based on superconducting magnetic energy storage coil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] SMES and FCL consist of a DC-to-DC converter and are connected by SMES magnetic energy storage coils. The SMES coil part is designed to alleviate the power fluctuations generated by the wind farm; when a short-circuit fault occurs on the DC line, the FCL will act to stabilize the fault current. The initial inductance L of the SMES magnetic energy storage coil SMES and initial current I SMES0 Determined by the following optimization method. figure 2 It is the controller of the SMES coil, by controlling 4 PI control parameters (K Pi and K Ii ,i=1,2) comes from the control figure 1 The opening and closing of the switches S1 and S2 in the SMES part modulates the PWM wave to make the SMES coil switch between charging and discharging modes.

[0041]The operating principle of SMES can be described by the power flow equation:

[0042] P DC =P WVSC +P SMES (11)

[0043] where P DC ,P WVSC and P SMES are the active power in the DC line, wind farm side VSC and SMES ...

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Abstract

The invention belongs to the technical field of wind power integration, and relates to a parameter optimization method for integrating a wind power plant of a superconducting magnetic energy storage coil into VSC-HVDC. The problem that the effect of the SMES coil is reduced due to the fact that the initial inductance LSMES, the initial current ISMES0 and four PI control parameters (KPi and KIi, i= 1, 2) of the SMES magnetic energy storage coil are not optimized is solved. The method comprises the following steps: taking minimization of a direct current power accumulation error, minimization of a direct current voltage accumulation deviation and minimization of SMES coil initial energy as target functions, enabling a system to show a minimum direct current power fluctuation situation, configuring different weights, and determining an optimal value of a superconducting magnetic energy storage coil parameter according to a particle swarm algorithm. By utilizing the SMES-FCL, DC power fluctuation caused by intermittent wind power generation can be reduced, and the fault current of a DC line is limited.

Description

technical field [0001] The invention belongs to the technical field of wind power grid connection, and relates to a parameter optimization method for a wind farm with a superconducting magnetic energy storage coil integrated into a VSC-HVDC. Background technique [0002] For the control strategy of DFIG wind farm side and grid side converters, the wind farm side VSC is composed of constant AC voltage and constant active power, and the grid side VSC is composed of constant reactive power and constant DC voltage control. The frequency of the offshore AC grid can be controlled by a frequency controller, which keeps the frequency constant by adjusting the active power of the wind farm. The AC voltage of the wind farm is controlled by the external voltage controller loop and the internal current control loop of the wind farm VSC. [0003] As an important renewable energy, wind power energy occupies an important position in the future energy development. The power grid has put fo...

Claims

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Application Information

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IPC IPC(8): G06Q50/06G06N3/00G06F30/20H02J3/38
CPCG06N3/006G06Q50/06Y02E40/10Y02E40/60
Inventor 吕清泉马明周强汪宁渤包广清蒲文静李媛周家武韩旭杉马彦宏王明松张健美张艳丽张彦琪王定美李津张金平黄蓉
Owner STATE GRID GANSU ELECTRIC POWER CORP
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