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Economic improvement evaluation method for energy consumption device of offshore wind power flexible direct current system

A technology of offshore wind power and energy-consuming devices, which is applied in the directions of emergency protection circuit devices, wind power generation, electrical components, etc., and can solve the problem of increasing the area of ​​offshore platforms and load-bearing requirements, harsh operation and maintenance conditions of offshore platforms, and extremely high system reliability requirements, etc. problem, to achieve the effect of expanding the scope of the target, improving the energy margin, and enhancing the feasibility

Active Publication Date: 2022-04-12
CHINA THREE GORGES PROJECTS DEV CO LTD +1
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Problems solved by technology

For offshore wind power, the configuration of AC energy-consuming devices at sea will increase the area and load-bearing requirements of the offshore platform, increase the investment in engineering construction, and the operation and maintenance conditions of the offshore platform are harsh, and the requirements for system reliability are extremely high

Method used

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  • Economic improvement evaluation method for energy consumption device of offshore wind power flexible direct current system
  • Economic improvement evaluation method for energy consumption device of offshore wind power flexible direct current system
  • Economic improvement evaluation method for energy consumption device of offshore wind power flexible direct current system

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Embodiment

[0182] Now, the present invention will be described in detail by taking the trial application of the present invention to an offshore wind power grid-connected project as an example, which also has a guiding effect on the application of the present invention to the control of other offshore wind power systems connected to the flexible DC grid.

[0183] combine Figure 7 to Figure 10 The calculation situation in is described for this embodiment.

[0184] In this embodiment, Table 1 shows the relationship between the overvoltage multiples of the sub-module capacitors in the converter valve and the DC energy consumption valve and the corresponding maximum allowable running time.

[0185] Table 1 The relationship between the overvoltage multiple of the sub-module capacitor in the converter valve and the DC energy consumption valve and the corresponding maximum allowable running time

[0186] Capacitor overvoltage multiple maximum allowable run time 1.15 30 minut...

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Abstract

The invention discloses an economical efficiency improvement evaluation method for an energy consumption device of an offshore wind power flexible direct current system. The method comprises the following steps: step 1, inputting characteristic parameters of the offshore wind power flexible direct current system, and carrying out data preprocessing; 2, calculating the energy margin of the offshore wind power flexible direct current system; 3, checking the energy margin feasibility of the offshore wind power flexible direct current system; step 4, calculating an economical efficiency improvement index of the energy consumption device under the parallel input strategy; and step 5, calculating the economical efficiency improvement index of the energy consumption device under the serial input strategy. The method has the advantages that the maximum energy margin of the offshore wind power flexible direct-current system is quantitatively evaluated when the alternating-current power grid at the receiving end has the alternating-current fault, and the situation that the economical efficiency of an energy consumption device is improved through the parallel input strategy and the serial input strategy of energy margin energy absorption and resistance energy consumption is quantitatively compared and analyzed so as to determine which input strategy can be adopted.

Description

technical field [0001] The present invention relates to the technical field of electric power system transmission, in particular to the field of offshore wind power projects connected to the grid through flexible DC transmission, more specifically, it is an evaluation of the economical improvement of DC energy consumption devices of offshore wind power systems connected to the grid through flexible DC method. Background technique [0002] At present, offshore wind power grid-connected in distant seas adopts the technology based on high-voltage flexible direct current transmission (VSC-HVDC). Modular multilevel converter (MMC) is a flexible DC transmission converter that is more suitable for high voltage levels and large transmission capacity applications, so it has broad application prospects in large-scale grid-connected offshore wind power . my country's Jiangsu Rudong Offshore Wind Power Flexible DC Transmission Project uses the MMC converter topology. [0003] The fai...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32H02J3/36H02H7/26
CPCY02E10/76Y02E60/60Y02E70/30
Inventor 罗代军鲁晓军胡宗邱李梦柏邓海峰金能孙文才陈功陈飞宇
Owner CHINA THREE GORGES PROJECTS DEV CO LTD
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