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Coordinated control method and system for external transmission of isolated island doubly-fed wind farms via HVDC transmission

A high-voltage direct current transmission and cooperative control technology, which is applied in wind power generation, power transmission AC network, AC network voltage adjustment, etc., can solve the problems of small capacity, high price, and large power consumption, and achieve simple design, easy engineering implementation, The effect of increasing the inertia of the system

Active Publication Date: 2022-07-05
STATE GRID ECONOMIC TECH RES INST CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although VSC-HVDC technology has the capabilities of these two aspects, it has disadvantages such as small capacity, high power consumption, and high price.

Method used

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  • Coordinated control method and system for external transmission of isolated island doubly-fed wind farms via HVDC transmission
  • Coordinated control method and system for external transmission of isolated island doubly-fed wind farms via HVDC transmission
  • Coordinated control method and system for external transmission of isolated island doubly-fed wind farms via HVDC transmission

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Experimental program
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Embodiment

[0063] like figure 1 As shown, it is a schematic diagram of the structure of the island doubly-fed wind farm sent out via LCC-HVDC. In the figure, 1 and 7 represent the LCC-HVDC sending and receiving AC power grid busbars, respectively. For an island doubly-fed wind farm, the sending end bus 1 is not connected to the traditional power grid; 5 and 6 represent LCC-HVDC sending and receiving, respectively. end converter; 2 is a large-scale island doubly-fed wind farm, which usually uses maximum power point tracking (MPPT) control to convert wind energy into electrical energy, and then transmits the electrical energy to the load-side power grid over a long distance through the LCC-HVDC system to achieve energy efficiency. Reasonable distribution and utilization; 3 is the LCC-HVDC sending end rectification filter, which is used to filter out harmonics and provide reactive power compensation; The DFIG provides the excitation at startup and the voltage reference during normal operat...

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Abstract

The invention relates to a coordinated control method and system for the external transmission of island doubly-fed wind farms via high-voltage direct current transmission. The DFIG wind farm starts to provide the generator terminal voltage; according to the established generator terminal voltage, the DFIG wind turbine is started and connected to the grid, and the synchronous camera adjusts the output reactive power to keep the bus voltage stable and keep the bus voltage at the rated value; when the DFIG generator starts , when the active power starts to rise, the LCC‑HVDC system is unlocked, the inverter adopts constant DC voltage control, the rectifier adopts frequency control to adjust the active power balance of the DC sending end, and the synchronous modulator is made to work at the rated speed through the PI regulator, so that the island wind farm can be The active power balance of LCC-HVDC realizes the stable operation of the isolated doubly-fed wind farm through the coordinated control of LCC-HVDC.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a coordinated control method and system for the external transmission of island doubly-fed wind farms via high-voltage direct current transmission. Background technique [0002] Renewable energy power generation technologies such as wind power generation and photovoltaics are becoming more and more mature. my country's new energy mostly adopts the development mode of "centralized arrangement and long-distance transmission". plays an important role in the transmission of energy and electricity. [0003] As my country's new energy is generally connected to the power grid over long distances, most of the new energy connected to the HVDC transmission end is in a weak connection state. The weak connection is mainly reflected in the low short-circuit ratio of the grid connection point where the new energy is connected to the power grid and the small equivalent inertia of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/38H02J3/16H02J3/18H02J3/46
CPCH02J3/36H02J3/388H02J3/381H02J3/16H02J3/1885H02J3/466H02J2300/28Y02E40/30
Inventor 邹欣蒋维勇王智冬赵晟凯耿华王菲李俊霖索之闻李晓飞
Owner STATE GRID ECONOMIC TECH RES INST CO