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Low-voltage ride-through control method and device for double-fed fan
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A low-voltage ride-through, doubly-fed wind turbine technology, applied in circuit devices, wind power generation, electrical components, etc., can solve the problems of inability to suppress the reactive power of wind turbines, poor adaptability, etc.
Active Publication Date: 2020-06-16
GUANGDONG POWER GRID CO LTD +1
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[0006] In view of this, the purpose of the present invention is to provide a low-voltage ride-through control method and device for double-fed wind turbines, so as to alleviate the poor adaptability of the existing low-voltage ride-through methods for double-fed wind turbines when dealing with faults of different degrees, and cannot well suppress Technical issues of reactive power absorbed by wind turbines from the grid
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Embodiment 1
[0049] A low-voltage ride-through control method for doubly-fed wind turbines, reference figure 1 , applied to the crowbar circuit in which the variable braking resistor is connected in series on the rotor side, the method includes:
[0050] S102. Obtain the rotor current and DC bus voltage of the crowbar circuit;
[0051] In the embodiment of the invention, the low-voltage ride-through control method of the double-fed fan is applied to a crowbar circuit connected in series with a variable braking resistor on the rotor side. The crowbar circuit will be described in detail below and will not be repeated here.
[0052] S104. Analyzing the rotor current and the DC bus voltage to obtain an analysis result;
[0053] S106. According to the analysis result, control the connection of each resistor in the variable braking resistor on the rotor side, so as to realize the dynamic adjustment of the serial resistors in the event of a fault, and improve the effect of low voltage ride throu...
Embodiment 2
[0120] A double-fed fan low-voltage ride-through control device, reference Figure 5 , which is applied to the crowbar circuit where the variable braking resistor is connected in series on the rotor side, the device includes:
[0121] An acquisition module 11, configured to acquire the rotor current and the DC bus voltage of the crowbar circuit;
[0122] The analysis module 12 is used to analyze the rotor current and the DC bus voltage to obtain analysis results;
[0123] The control module 13 is used to control the connection of each resistor in the variable braking resistor on the rotor side according to the analysis results, so as to realize the dynamic adjustment of the series resistors in the event of a fault and improve the effect of low voltage ride through.
[0124] In the double-fed fan low-voltage ride-through control device in the embodiment of the present invention, different analysis results can be obtained according to the different conditions of the rotor curre...
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Abstract
The invention provides a method and a device for controlling the low voltage ride through of a double-feed fan. The method comprises the following steps: obtaining the rotor current and direct-currentbus voltage of a crowbar circuit; analyzing the rotor current and direct-current bus voltage to obtain an analysis result; controlling the access of each resistor inside a variable brake resistor onthe rotor side according to the analysis result so as to realize dynamic adjustment for tandem resistance during failures, and thus improving the low voltage ride through effect. When the method facesdifferent voltage fallings, the resistance value inside the crowbar circuit can be accessed selectively, so that the best effect for suppressor current and a protective circuit is reached, the adaptation of the protective circuit when different degrees of failures are encountered is greatly improved, the reactive power of a draught fan during the failures from power grid adsorption is reduced, and the technical problem that the reactive power of the draught fan from power grid adsorption cannot be inhibited preferably due to the fact that the adaptation of an existing method for controlling the low voltage ride through of the double-feed fan when different degrees of failures are encountered is low is solved.
Description
technical field [0001] The invention relates to the technical field of low-voltage ride-through of a doubly-fed fan, in particular to a low-voltage ride-through control method and device for a doubly-fed fan. Background technique [0002] With the development of new energy grid-connected technology, wind power technology is relatively mature compared with photovoltaic, nuclear power, biomass power generation and other technologies, and the proportion of wind turbine grid-connected capacity in the grid continues to increase. Doubly-fed induction generator, as the main wind turbine used in the market, has the advantages of small size, low cost, variable speed, constant frequency and maximum power tracking. Compared with other wind turbines, it is more sensitive and easier to disconnect from the grid, which is not conducive to the restoration of the grid. Therefore, the low voltage ride-through control of double-fed wind turbines has become a hot research topic in the industry....
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Application Information
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