CN103337878A - Control method for low-voltage ride through of direct-drive electric excitation type wind turbine generator - Google Patents
Control method for low-voltage ride through of direct-drive electric excitation type wind turbine generator Download PDFInfo
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- CN103337878A CN103337878A CN2013103078037A CN201310307803A CN103337878A CN 103337878 A CN103337878 A CN 103337878A CN 2013103078037 A CN2013103078037 A CN 2013103078037A CN 201310307803 A CN201310307803 A CN 201310307803A CN 103337878 A CN103337878 A CN 103337878A
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Abstract
The invention discloses a control method for low-voltage ride through of a direct-drive electric excitation type wind turbine generator. Under the condition that the voltage of a power grid drops, a detecting module of an electrical system of the direct-drive electric excitation type wind turbine generator detects the voltage of the power grid, the power of a motor and the voltage of a direct-current capacitor and transfers detected data to a total controller, and the total controller judges the running state for parameters; after the running state is judged, the exciting current of the generator and the current of a converter at the generator side and the current of a converter at the power grid are controlled, therefore the balance of input and output energy of a full-power converter of the wind turbine generator is controlled, and the generator safely tides over the low-voltage ride through process. Under the condition that a crowbar circuit of the full-power converter is not arranged, the control method realizes the low-voltage ride through capability of the wind turbine generator and meanwhile can avoid the adverse effect on the power grid as reactive power is absorbed from the power grid side in the low-voltage ride through process.
Description
Technical field
The present invention relates to the wind turbine generator low-voltage and pass through control technology, particularly a kind ofly directly drive the control method that electric excitation type wind-powered electricity generation unit low-voltage is passed through.
Background technology
Along with the world and development of Chinese economy, the consumption of the energy will sharply increase.Yet because the consumption of the scarcity relatively of china natural resources and non-renewable resources is for environment damage, make China will be faced with the dual-pressure of environment and resource for a long time in following a period of time, development comprises that the regenerative resource of wind-force and solar power generation is the best solution of China energy predicament.Therefore, along with the continuous increase of wind-powered electricity generation proportion in the electrical network, China has proposed higher specification requirement to the grid connected wind power unit, passes through (LVRT) ability as low-voltage.The low voltage ride-through capability of wind-driven generator refers to be reduced under the situation of certain value in wind-powered electricity generation unit terminal voltage during the electric network fault, and the wind-powered electricity generation unit can keep the ability that is incorporated into the power networks and runs without interruption in the certain hour scope.
For dissimilar wind-powered electricity generation units, the implementation method of its LVRT function is also different.Be used for improving the current transformer crow bar power consumption control that the measure of LVRT ability mainly contains the rotor Crowbar control of double-fed type and directly drives type at present, but these two kinds of control modes all need to increase many hardware costs.Therefore, a kind of suitable and low voltage traversing control method economize on hardware cost, to greatly promote the development and use scale of this regenerative resource of wind power generation undoubtedly, drive the development that domestic relevant wind power plant is made industry, the healthy and rapid development of national economy will be played an important role.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of low voltage traversing control method of electric excitation type wind-powered electricity generation unit under the situation that does not dispose current transformer hardware crowbar circuit that directly drive.
The technical scheme that the present invention addresses the above problem may further comprise the steps:
(1) testing circuit detects line voltage, power of motor, dc capacitor voltage and sends the data that detect to master controller, and master controller carries out running status to parameter and judges;
(2) master controller judges whether line voltage is higher than 90% of rated voltage, if line voltage is higher than 90% of rated voltage, then carries out routine control, and low-voltage is passed through control and is failure to actuate; If line voltage is lower than 90% of rated voltage and is higher than 20%, then trigger the control model that low-voltage is passed through; If line voltage is lower than 20% of rated voltage, then out of service, protection is shut down;
(3) after the triggering low-voltage was passed through control model, master controller continued whether to judge power of motor greater than 20% of rated power, if power of motor then triggers grid side current transformer Current Control less than 20% of rated power at this moment; If power of motor then triggers exciting current and grid side current transformer Current Control simultaneously greater than 20% of rated power at this moment;
Master controller judged that whether dc capacitor voltage is greater than 112% of rated value when (4) the triggering low-voltage was passed through control model, if dc capacitor voltage is greater than 112% of rated value, then trigger motor side current transformer Current Control, if dc capacitor voltage is less than specified 112%, starter motor side converter Current Control not then.
Exciting current is controlled to be control exciting current size and detected line voltage is directly proportional in the described step (3), if namely detection of grid voltage is specified 80%, then controls the exciting current size and arrives original 80%.
Beneficial effect of the present invention is:
1, is not designed for catabiotic crowbar circuit in the full power convertor of electrical system of the present invention, saved hardware cost;
2, low-voltage of the present invention is passed through principle and the structure that control does not change former wind turbine generator control and electrical system, so the retrofit work amount is little, is suitable for large batch of applying.
Description of drawings
Fig. 1 directly drives electric excitation wind-powered electricity generation unit electrical system architecture block diagram for the present invention.
Fig. 2 is the structural representation of exciter current of generator control circuit of the present invention.
Fig. 3 is the flow chart of low voltage traversing control method among the present invention.
Fig. 4 is the Current Control schematic diagram of motor side among the present invention.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, directly drive electric excitation type wind-powered electricity generation unit electrical system and comprise exciter current of generator control circuit 1, synchronous electric excitation generator 2, motor side full power convertor 3, dc capacitor 4, grid side full power convertor 5, testing circuit 6, master controller 7 and ups power 8, ups power 8, testing circuit 6 links to each other with master controller 7, master controller 7 respectively with motor side full power convertor 3, grid side full power convertor 5 links to each other, described dc capacitor 4 respectively with motor side full power convertor 3, grid side full power convertor 5 links to each other, described motor side full power convertor 3 links to each other with synchronous electric excitation generator 2, described grid side full power convertor 5 links to each other with electrical network, one end of described exciter current of generator control circuit 1 links to each other with electrical network, and the other end links to each other with synchronous electric excitation generator 2.
Fig. 3 is the low voltage traversing control method flow chart, and detailed control flow is described as follows:
When (1) blower fan normally moves, at first setting up procedure 301,6 pairs of line voltages of testing circuit detect, and the voltage that detects sent in the master controller 7, execution in step 302 master controllers 7 carry out the line voltage judgement then, when line voltage greater than specified 90% the time, execution in step 309 enters the state of normal control; When line voltage greater than rated voltage 20% less than 90% the time, then execution in step 304 enters the low control model of wearing; When line voltage less than specified 20% the time, then execution in step enters 303 shutdown modes;
(2) when finish the fan condition judgement according to grid side voltage after, if execution in step 304 has entered the low control model of wearing, this moment, master controller 7 will be simultaneously undertaken that power of motor detects and step 306 is carried out dc capacitor voltage and detected the result who obtains and carry out corresponding control model selection by execution in step 308 so;
(3) execution in step 306, and master controller detects dc capacitor voltage, when dc capacitor voltage less than 112% of rated voltage, so this moment starter motor side converter Current Control not; When dc capacitor voltage greater than 112% of rated voltage, starter motor side converter Current Control then; Fig. 4 is motor side Current Control schematic diagram, among the figure, dc voltage Udc is as real-time measured value, with the poor △ Udc of dc capacitor voltage set point Udc_ref, as the input variable of current PI control, this difference has been controlled the electric current output reference value id of motor side, △ Udc is more big, reference current id control dynamics is more big, and this mode is used for the size of current of control current transformer motor side, is used for stablizing dc capacitor voltage;
(4) execution in step 308 master controllers carry out power of motor when detect judging, when power of motor less than 20% of rated power, then execution in step 305 starts grid side current transformer Current Control; Because this moment, power was little, grid side current transformer output current is also very little, and this control mode rises to current transformer grid side electric current rapidly specified, the current capacity that utilizes current transformer itself to have, to outside transmission power, keep the stable of the interior dc capacitor voltage of current transformer to greatest extent; When power of motor greater than 20% of rated power, then execution in step 313 starts exciting current control, this control mode control exciting current size and detected line voltage are directly proportional, if namely detection of grid voltage is specified 80%, then controls the exciting current size and arrive original 80%.
Fig. 2 is the detailed diagram of exciter current of generator control circuit 1, comprise electrical network, synchronous electric excitation generator, PWM rectification module 9, degausser 10, motor excitation winding 11, exciting current control module 12 among the figure, among Fig. 2, the exciter current of generator control circuit has 2 cover PWM rectification modules 9, this module connects electrical network and synchronous excitation generator respectively, field circuit passes through from electrical network power taking source when normal operation, under line voltage falls situation, from electric excitation generator stator side-draw field power supply; After triggering the exciting current control model, reduce the size of current of excitation by exciting current control module 12, namely by reducing the induced voltage that exciting current reduces the motor side stator, namely can limit the input power of current transformer motor side, keep the energy balance of blower fan current transformer.
In the The whole control flow process, control for motor side power has comprised motor side electric current and two kinds of controls of motor side voltage, wherein the motor side Current Control is feedback condition with the dc capacitor voltage, the motor side voltage control is to realize by control exciting current size, be feedback condition with the line voltage size, two kinds of controls cooperatively interact and carry out, and can be good at controlling motor side power, realize the low voltage ride-through capability of system.
Claims (2)
1. one kind is directly driven the control method that electric excitation type wind-powered electricity generation unit low-voltage is passed through, and may further comprise the steps:
(1) testing circuit detects line voltage, power of motor, dc capacitor voltage and sends the data that detect to master controller, and master controller carries out running status to parameter and judges;
(2) master controller judges whether line voltage is higher than 90% of rated voltage, if line voltage is higher than 90% of rated voltage, then carries out routine control, and low-voltage is passed through control and is failure to actuate; If line voltage is lower than 90% of rated voltage and is higher than 20%, then trigger the control model that low-voltage is passed through; If line voltage is lower than 20% of rated voltage, then out of service, protection is shut down;
(3) after the triggering low-voltage was passed through control model, master controller continued whether to judge power of motor greater than 20% of rated power, if power of motor then triggers grid side current transformer Current Control less than 20% of rated power at this moment; If power of motor then triggers exciting current and grid side current transformer Current Control simultaneously greater than 20% of rated power at this moment;
Master controller judged that whether dc capacitor voltage is greater than 112% of rated value when (4) the triggering low-voltage was passed through control model, if dc capacitor voltage is greater than 112% of rated value, then trigger motor side current transformer Current Control, if dc capacitor voltage is less than specified 112%, starter motor side converter Current Control not then.
2. according to claim 1ly directly drive the control method that electric excitation type wind-powered electricity generation unit low-voltage is passed through, it is characterized in that: the middle exciting current of described step (3) is controlled to be control exciting current size and detected line voltage is directly proportional, if namely detection of grid voltage is specified 80%, then control the exciting current size to original 80%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103944192A (en) * | 2014-05-15 | 2014-07-23 | 湘电风能有限公司 | Control method for fault ride-through of direct-current exciting direct-driven wind turbine generator |
| CN107643492A (en) * | 2017-09-07 | 2018-01-30 | 明阳智慧能源集团股份公司 | UPS battery automatic testing method in a kind of wind driven generator set converter |
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| CN103944192A (en) * | 2014-05-15 | 2014-07-23 | 湘电风能有限公司 | Control method for fault ride-through of direct-current exciting direct-driven wind turbine generator |
| CN107643492A (en) * | 2017-09-07 | 2018-01-30 | 明阳智慧能源集团股份公司 | UPS battery automatic testing method in a kind of wind driven generator set converter |
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