CN103956771A - Low voltage ride-through system - Google Patents
Low voltage ride-through system Download PDFInfo
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- CN103956771A CN103956771A CN201410182867.3A CN201410182867A CN103956771A CN 103956771 A CN103956771 A CN 103956771A CN 201410182867 A CN201410182867 A CN 201410182867A CN 103956771 A CN103956771 A CN 103956771A
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- low voltage
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- current transformer
- fed asynchronous
- asynchronous generator
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Abstract
The invention provides a low voltage ride-through system. A master control system module receives work status information of a doubly fed induction generator and a converter connected with the doubly fed induction generator; the master control system module sends a trigger command or an end command to a low voltage ride-through module; a yaw system receives a first control signal sent by the master control system module and a second control signal sent by the low voltage ride-through module and adjusts the work status of the doubly fed induction generator, so that the problems that operating voltage of a power grid in the prior art is too low and low voltage ride-through is needed, and when the converter is cut off and rotor side short circuit protection circuit is connected, the rotor of the doubly fed induction generator overspeeds are solved; when the voltage of the power grid recovers, the rotor side short circuit protection circuit is cut off, and when the converter returns to work, normal working of the power grid is recovered after a long time of adjustment.
Description
Technical field
The present invention relates to the field of generating electricity by way of merging two or more grid systems, particularly a kind of low voltage ride through system.
Background technology
Along with the development of human society, the energy and environmental problem become the problem that human survival and development must solve; Wherein, wind-powered electricity generation and photoelectricity are the regenerative resources that current people comparatively pay attention to, not only clean environment firendly, and also inexhaustible, grid-connected photovoltaic system and wind-electricity integration electricity generation system have started to rise in various places gradually in recent years.After grid-connected, the stability of wind-powered electricity generation electricity generation system and photovoltaic generating system is the difficult problem that all must solve in grid-connected, the randomness of generating and unsteadiness bring unfavorable factor may to power grid security even running, and the fluctuation of operation of power networks also can affect the safety of wind-powered electricity generation electricity generation system and photovoltaic generating system.For example, in the time that Operating Voltage is too low, if the wind-powered electricity generation electricity generation system being incorporated into the power networks or photovoltaic generating system can not well be realized low-voltage crossing, also can affect the stable of power system operation.
In prior art, during for operation of power networks, realize low-voltage crossing when brownout and cause the unsettled situation of power system operation, mainly adopt rotor-side short-circuit protection technology (Crowbar).In patent CN201010547732.4, for the phenomenon of sharply falling of line voltage, cause the rotor-side electric current of current transformer to increase, direct voltage raises; But in the time that the voltage of the rotor-side of current transformer exceedes certain value, IGBT switch just can not bear, in order to protect current transformer, must access rotor-side short-circuit protection circuit, make current transformer lose the control to double-fed asynchronous generator; In the time that line voltage recovers, cut off access rotor-side short-circuit protection circuit, adjust double-fed asynchronous generator and recover normal operating conditions.
In patent CN201110389697.2; be by adding electrochemical capacitor to DC-voltage supply for the phenomenon of sharply falling of line voltage, and then ensure the stable of voltage, improved low voltage ride-through capability; but in the time running into as short trouble, still need to access rotor-side short-circuit protection circuit.
Although above patent has realized the wind-powered electricity generation electricity generation system that is incorporated into the power networks or the low-voltage crossing of photovoltaic generating system; but in the time of access rotor-side short-circuit protection circuit; the rotor of the double-fed asynchronous generator in wind-powered electricity generation electricity generation system is understood overspeed, has reduced the stability of double-fed asynchronous generator.In addition, in the time that line voltage recovers, cut off access rotor-side short-circuit protection circuit, when current transformer is resumed work, need the normal work that regulates longer a period of time could recover electrical network, postponed the performance of the normal work of electrical network.
Summary of the invention
The object of the present invention is to provide a kind of low voltage ride through system; to solve the too low low-voltage crossing that needs of Operating Voltage in the prior art; while taking to cut off current transformer access rotor-side short-circuit protection; cause the rotor overspeed operation of double-fed asynchronous generator; in the time that line voltage recovers; cut off access rotor-side short-circuit protection circuit, when current transformer is resumed work, need to regulate longer a period of time could recover the problem of the normal work of electrical network.
For solving the problems of the technologies described above, the invention provides a kind of low voltage ride through system, described low voltage ride through system comprises: double-fed asynchronous generator, current transformer, master control system module, low voltage crossing module and yaw system;
Described master control system module receives the work state information of described double-fed asynchronous generator and the described current transformer being connected with described double-fed asynchronous generator; Described master control system module sends trigger command or extremely described low voltage crossing module of the finish command; Described yaw system receives the first control signal and the second control signal that are sent by described master control system module and described low voltage crossing module, and regulates the operating state of described double-fed asynchronous generator.
Optionally, in described low voltage ride through system, described double-fed asynchronous generator comprises stator and the rotor around described stator rotation.
Optionally, in described low voltage ride through system, the operating state of described double-fed asynchronous generator comprises supersynchronous generating state and synchronous generator state.
Optionally, in described low voltage ride through system, n>n1 when described supersynchronous generating state; Wherein, the rotating speed of the described rotor that n is described double-fed asynchronous generator, the rotating speed of the rotating magnetic field that n1 is described double-fed asynchronous generator.
Optionally, in described low voltage ride through system, n=n1 when described synchronous generator state; Wherein, the rotating speed of the described rotor that n is described double-fed asynchronous generator, the rotating speed of the rotating magnetic field that n1 is described double-fed asynchronous generator.
Optionally, in described low voltage ride through system, the operating state of described current transformer comprises normal condition and abnormality.
Optionally, in described low voltage ride through system, the operating state of described current transformer is limited by the direct voltage threshold value of described current transformer, and in the time that the operation DC voltage of described current transformer is greater than the direct voltage threshold value of described current transformer, the operating state of described current transformer is abnormality; In the time that the operation DC voltage of described current transformer is less than or equal to the direct voltage threshold value of described current transformer, the operating state of described current transformer is normal condition.
Optionally, in described low voltage ride through system, also comprise the electrical network being connected with described double-fed asynchronous generator.
Optionally, in described low voltage ride through system, also comprise the Crowbar module being connected with described current transformer.
Optionally, in described low voltage ride through system, described current transformer comprises rotor-side converter and grid side current transformer; Described rotor-side converter is connected with described Crowbar module with described double-fed asynchronous generator respectively; Described grid side current transformer is connected with described electrical network with described double-fed asynchronous generator respectively.
Optionally, in described low voltage ride through system, described master control system module comprises: state detection module and the control module being connected with described state detection module.
Optionally, in described low voltage ride through system, described low voltage crossing module comprises: state receiver module and the driftage parameter control module being connected with described state receiver module.
In low voltage ride through system provided by the present invention, received the work state information of described double-fed asynchronous generator and the described current transformer being connected with described double-fed asynchronous generator by described master control system module; Described master control system module sends trigger command or extremely described low voltage crossing module of the finish command; Described yaw system receives the first control signal and the second control signal that are sent by described master control system module and described low voltage crossing module, and regulate the operating state of described double-fed asynchronous generator, thereby solve the too low low-voltage crossing that needs of Operating Voltage in prior art, while taking to cut off current transformer access rotor-side short-circuit protection, cause the rotor overspeed operation of double-fed asynchronous generator; In the time that line voltage recovers, cut off access rotor-side short-circuit protection circuit, when current transformer is resumed work, need to regulate longer a period of time could recover the problem of the normal work of electrical network.
Brief description of the drawings
Fig. 1 is the flow chart of low voltage ride through system in one embodiment of the invention.
Wherein, in Fig. 1:
Double-fed asynchronous generator-100; Current transformer-200; Master control system module-300; State detection module-301; Control module-302; Low voltage crossing module-400; State receiver module-401; Driftage parameter control module-402; Yaw system-500; Crowbar module-600.
Embodiment
Low voltage ride through system the present invention being proposed below in conjunction with the drawings and specific embodiments is described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the object of the aid illustration embodiment of the present invention lucidly.
Please refer to Fig. 1, it is the flow chart of low voltage ride through system in one embodiment of the invention.As shown in Figure 1, described low voltage ride through system, comprising: double-fed asynchronous generator 100, current transformer 200, master control system module 300, low voltage crossing module 400 and yaw system 500; Described master control system module 300 receives the work state information of described double-fed asynchronous generator 100 and the described current transformer 200 being connected with described double-fed asynchronous generator 100; Described master control system module 300 sends trigger command or extremely described low voltage crossing module 400 of the finish command; Described yaw system 500 receives the first control signal and the second control signal that are sent by described master control system module 300 and described low voltage crossing module 400, and regulates the operating state of described double-fed asynchronous generator 100.
Further, described low voltage ride through system also comprises the electrical network (not indicating in Fig. 1) being connected with described double-fed asynchronous generator 100 and the Crowbar module 600 being connected with described current transformer 200.
Further, described double-fed asynchronous generator 100 comprises stator and the rotor (not indicating in Fig. 1) around described stator rotation.Concrete, described stator is directly connected with described electrical network by stator winding; Described rotor is connected with described electrical network through current transformer 200 by rotor winding; Wherein, described stator winding is responsible for producing induced electromotive force and electric current, and described rotor winding is responsible for producing magnetic field, in stator, rotor and air gap, produces along the magnetic field of stator rotation, is rotating magnetic field.
Further, described current transformer 200 comprises rotor-side converter and grid side current transformer; Described rotor-side converter is connected with described Crowbar module 600 with described double-fed asynchronous generator 100 respectively; Described grid side current transformer distributes and is connected with described electrical network with described double-fed asynchronous generator 100.
In the present embodiment, the operating state of described double-fed asynchronous generator 100 comprises supersynchronous generating state and synchronous generator state; N>n1 when described supersynchronous generating state; N=n1 when described synchronous generator state; Wherein, n is the rotating speed of the described rotor of described double-fed asynchronous generator 100, and n1 is the rotating speed of the rotating magnetic field of described double-fed asynchronous generator 100.
Further, described low voltage crossing module 400 comprises: state receiver module 401 and the driftage parameter control module 402 being connected with described state receiver module 401.
Further, described master control system module 300 comprises: state detection module 301 and the control module 302 being connected with described state detection module 301.
Further, the operating state of described current transformer 200 comprises normal condition and abnormality.Concrete, the operating state of described current transformer 200 is limited by the direct voltage threshold value of described current transformer 200, in the time that the operation DC voltage of described current transformer 200 is greater than the direct voltage threshold value of described current transformer 200, the operating state of described current transformer 200 is abnormality; In the time that the operation DC voltage of described current transformer 200 is less than or equal to the direct voltage threshold value of described current transformer 200, the operating state of described current transformer 200 is normal condition.
Please continue to refer to Fig. 1, concrete, if the operating state of double-fed asynchronous generator 100 is supersynchronous generating state, and when the DC voltage rising of described current transformer 200 exceedes the direct voltage threshold value of current transformer 200 (when the operating state of described current transformer is abnormality), described Crowbar module 600 is started working, moving described Crowbar module 600 protects described current transformer 200, send trigger command by controlling described master control system module 300 to the state receiver module 401 in described low voltage crossing module 400 simultaneously, send the finish command to control module 302 simultaneously, make the control module 302 in master control system module 300 not send the first control signal to yaw system 500, and state receiver module 401 connects with driftage parameter control module 402, sending second by driftage parameter control module 402 controls signal to yaw system 500 and sets up communication, according to interactive communication between driftage parameter control module 402 and yaw system 500, the parameter of yaw system 500 is regulated and regulates the wind wheel angle of double-fed asynchronous generator 100 to change, and then the velocity of rotation of change wind wheel, the rotating speed of the rotor of double-fed asynchronous generator 100 is not exceeded the speed limit, improved the job stability of double-fed asynchronous generator 100.
In an embodiment of the present invention, yaw system 500 circulation feedacks are to double-fed asynchronous generator 100, operating state to double-fed asynchronous generator 100 judges repeatedly, in the time that the operating state of described double-fed asynchronous generator 100 is synchronous generator state, now Crowbar module 600 is not worked, send the finish command by controlling described master control system module 300 to the state receiver module 401 in described low voltage crossing module 400, send trigger command to control module 302 simultaneously, make the control module 302 in master control system module 300 send the first control signal to yaw system 500 foundation communications, and driftage parameter control module 402 need not send second and controls signal to yaw system 500.And then make the normal operating state that enters of double-fed asynchronous generator 100 quick and stable, and without the adjustment and recovery through the long period, shorten the adjusting time, improve service behaviour.
To sum up, in low voltage ride through system provided by the present invention, received the work state information of described double-fed asynchronous generator and the described current transformer being connected with described double-fed asynchronous generator by described master control system module; Described master control system module sends trigger command or extremely described low voltage crossing module of the finish command; Described yaw system receives the first control signal and the second control signal that are sent by described master control system module and described low voltage crossing module, and regulate the operating state of described double-fed asynchronous generator, thereby solve the too low low-voltage crossing that needs of Operating Voltage in prior art, while taking to cut off current transformer access rotor-side short-circuit protection, cause the rotor overspeed operation of double-fed asynchronous generator; In the time that line voltage recovers, cut off access rotor-side short-circuit protection circuit, when current transformer is resumed work, need to regulate longer a period of time could recover the problem of the normal work of electrical network.
Foregoing description is only the description to preferred embodiment of the present invention, the not any restriction to the scope of the invention, and any change, modification that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, all belong to the protection range of claims.
Claims (12)
1. a low voltage ride through system, is characterized in that, comprising: double-fed asynchronous generator, current transformer, master control system module, low voltage crossing module and yaw system;
Described master control system module receives the work state information of described double-fed asynchronous generator and the described current transformer being connected with described double-fed asynchronous generator; Described master control system module sends trigger command or extremely described low voltage crossing module of the finish command; Described yaw system receives the first control signal and the second control signal that are sent by described master control system module and described low voltage crossing module, and regulates the operating state of described double-fed asynchronous generator.
2. low voltage ride through system as claimed in claim 1, is characterized in that, described double-fed asynchronous generator comprises stator and the rotor around described stator rotation.
3. low voltage ride through system as claimed in claim 2, is characterized in that, the operating state of described double-fed asynchronous generator comprises supersynchronous generating state and synchronous generator state.
4. as profit requires 3 low voltage ride through system of stating, it is characterized in that n>n1 when described supersynchronous generating state; Wherein, the rotating speed of the described rotor that n is described double-fed asynchronous generator, the rotating speed of the rotating magnetic field that n1 is described double-fed asynchronous generator.
5. the low voltage ride through system of stating as claim 3, is characterized in that, n=n1 when described synchronous generator state; Wherein, the rotating speed of the described rotor that n is described double-fed asynchronous generator, the rotating speed of the rotating magnetic field that n1 is described double-fed asynchronous generator.
6. the low voltage ride through system of stating as claim 1, is characterized in that, the operating state of described current transformer comprises normal condition and abnormality.
7. the low voltage ride through system of stating as claim 6, it is characterized in that, the operating state of described current transformer is limited by the direct voltage threshold value of described current transformer, in the time that the operation DC voltage of described current transformer is greater than the direct voltage threshold value of described current transformer, the operating state of described current transformer is abnormality; In the time that the operation DC voltage of described current transformer is less than or equal to the direct voltage threshold value of described current transformer, the operating state of described current transformer is normal condition.
8. low voltage ride through system as claimed in claim 1, is characterized in that, also comprises the electrical network being connected with described double-fed asynchronous generator.
9. low voltage ride through system as claimed in claim 1, is characterized in that, also comprises the Crowbar module being connected with described current transformer.
10. the low voltage ride through system of stating as claim 8, is characterized in that, described current transformer comprises rotor-side converter and grid side current transformer; Described rotor-side converter is connected with described Crowbar module with described double-fed asynchronous generator respectively; Described grid side current transformer is connected with described electrical network with described double-fed asynchronous generator respectively.
11. low voltage ride through system as described in any one in claim 1-10, is characterized in that, described master control system module comprises: state detection module and the control module being connected with described state detection module.
12. require the low voltage ride through system as described in any one in 1-10 as weighed, and it is characterized in that, described low voltage crossing module comprises: state receiver module and the driftage parameter control module being connected with described state receiver module.
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| CN201410182867.3A CN103956771A (en) | 2014-04-30 | 2014-04-30 | Low voltage ride-through system |
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| CN201410182867.3A CN103956771A (en) | 2014-04-30 | 2014-04-30 | Low voltage ride-through system |
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| CN103956771A true CN103956771A (en) | 2014-07-30 |
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Cited By (3)
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| CN106802607A (en) * | 2017-03-20 | 2017-06-06 | 西安热工研究院有限公司 | A kind of Controlling Auxiliaries in Power Plants permanent magnet speed regulation system |
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| CN110912179A (en) * | 2018-09-14 | 2020-03-24 | 中车株洲电力机车研究所有限公司 | Fault-tolerant control method of double-fed wind turbine generator, double-fed wind turbine generator and double-fed motor |
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Application publication date: 20140730 |