Fault ride-through method for offshore wind power flexible direct current sending-out system

An offshore wind power and flexible direct current technology, applied in wind power generation, power transmission AC network, electrical components, etc., can solve problems such as poor fault ride-through effect, high cost, and impact on wind turbine operation

Pending Publication Date: 2021-07-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

Problems solved by technology

Changing the control strategy mainly realizes the reduction of input power through frequency-up method or step-down method, but with the up-frequency method, it takes a certain time for the wind turbine to detect the frequency change, and the fault ride-through effect is not good; with the step-down method, when a serious fault occ

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  • Fault ride-through method for offshore wind power flexible direct current sending-out system
  • Fault ride-through method for offshore wind power flexible direct current sending-out system
  • Fault ride-through method for offshore wind power flexible direct current sending-out system

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Embodiment Construction

[0055] The present invention proposes a method for fault ride-through of an offshore wind power flexible direct current transmission system. The steps of the method are as follows: (such as Figure 8 Fault ride-through flow chart of offshore wind power flexible DC transmission system shown)

[0056] Step 1. Consider the difference between the flexible direct current transmission system and the traditional transmission system, and design the control strategy of the flexible direct current transmission system suitable for offshore wind power transmission;

[0057] Step 2. Analyze the working principle of the DC energy consumption device, and point out the reasons for the large design power and long switching time of the DC energy consumption device in the project;

[0058] Step 3. Propose a fault ride-through control strategy for the DC energy consumption device and the wind farm side converter to step down the voltage and wind farm active load reduction, and compare it with the...

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Abstract

The invention discloses a fault ride-through method for an offshore wind power flexible direct current sending-out system, and belongs to the technical field of new energy power generation grid connection. According to the method, the difference between a flexible direct-current power transmission system and a traditional power transmission system is considered, and a flexible direct-current power transmission system control strategy suitable for offshore wind power transmission is designed; the working principle of the direct-current energy consumption device is analyzed, and reasons for large design power and long switching time of the direct-current energy consumption device in engineering are pointed out; aiming at the defects of the direct-current energy consumption device in engineering, a fault ride-through control strategy of voltage reduction of the direct-current energy consumption device and a wind field side converter and active load reduction of a wind power plant is provided, and is compared with a method for fault ride-through only by inputting the direct-current energy consumption device. According to the invention, the problems of large rated power and long switching time of a direct-current energy consumption device used in engineering are solved.

Description

technical field [0001] The invention belongs to the technical field of grid-connected new energy power generation, and in particular relates to a fault ride-through method for an offshore wind power flexible direct current transmission system. Background technique [0002] my country's offshore wind power has developed rapidly in recent years and has gradually moved into the deep sea. At the end of 2019, the cumulative grid-connected installed capacity reached 5.93 million kW, of which Jiangsu's grid-connected capacity reached 4.23 million kW, ranking first in the country. Flexible DC transmission technology is considered to be the first choice for large-scale offshore wind power grid integration in deep and open seas due to its advantages of independent adjustment of active power and reactive power and no need for reactive power compensation. When the onshore power grid fails, the active power output by the grid-connected inverter will drop rapidly due to the drop of the AC...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/38H02J3/00
CPCH02J3/36H02J3/381H02J3/001H02J2300/28Y02E60/60Y02E10/76
Inventor 贾科武文强郑黎明刘浅侯来运毕天姝
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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