CN104795839A - System and method for increasing low voltage ride-through of wind power generation system through magnetically-controlled reactor - Google Patents
System and method for increasing low voltage ride-through of wind power generation system through magnetically-controlled reactor Download PDFInfo
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- CN104795839A CN104795839A CN201510203178.0A CN201510203178A CN104795839A CN 104795839 A CN104795839 A CN 104795839A CN 201510203178 A CN201510203178 A CN 201510203178A CN 104795839 A CN104795839 A CN 104795839A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000010248 power generation Methods 0.000 title abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 43
- 238000004804 winding Methods 0.000 claims description 14
- 230000004907 flux Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
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- H02J3/386—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention discloses a system and a method for increasing low voltage ride-through of a wind power generation system through a magnetically-controlled reactor. The magnetically-controlled reactor is serially connected to a connecting line of the wind power generation system and a main grid of a power system; the magnetically-controlled reactor is under control of a control circuit I; the control circuit I acquires a voltage value of a grid-connected bus through a voltage transformer; when the voltage value U3 of the grid-connected bus is normal rated voltage Un, reactance value of the magnetically-controlled reactor is controlled to a minimum value Zmin; when the voltage value U3 of the grid-connected bus ranges from Un to 0.5Un, the reactance value Zmin of the magnetically-controlled reactor is maintained; when the voltage value U3 of the grid-connected bus ranges from 0.5Un to 0, the reactance value of the magnetically-controlled reactor is controlled to range from Zmin to Zmax. Adding a new control target and a new circuit to a control system of a double-fed wind generator is not required; the low voltage ride-through problem of the wind power generation system is solved; the method allows the low voltage ride-through capacity of the wind power generation system to be optimized. The method is simple and reliable.
Description
Technical field
The present invention relates to wind power generation field, particularly relate to the system and method that a kind of magnet controlled reactor improves wind generator system low voltage crossing.
Background technology
Wind power generation is clean energy resource, and in recent years, wind generator system is rapidly developed.Low voltage crossing, refers to that, when the grid-connected point voltage of wind-driven generator falls, blower fan can keep low voltage crossing grid-connected, even provide certain reactive power to electrical network, support power system restoration, until power system restoration is normal, thus " passing through " this low-voltage time (region).Low voltage crossing still keeps the grid-connected specific operation function requirement of one when Voltage Drop appears in electrical network to grid-connected blower fan.Require that wind generator system has stronger low voltage crossing (LVRT) ability.The patents such as CN103078349A, CN104362669A, CN104410098A propose various double-fed wind power generator system and low voltage traversing control method, these methods, are all to improve the control system of wind-driven generator self.Because the control system of wind-driven generator self will realize various control target, numerous target is difficult to realize in a set of control system harmonious, and control characteristic is difficult to realize optimizing.
Summary of the invention
Object of the present invention is exactly to solve the problem, a kind of magnet controlled reactor is provided to improve the system and method for wind generator system low voltage crossing, by magnet controlled reactor of connecting on the main electrical network connecting line of wind generator system and electric power system, outside at wind powered generator system, solve the control method of wind generator system low voltage crossing.
To achieve these goals, the present invention adopts following technical scheme:
Improve the system of wind generator system low voltage crossing with magnet controlled reactor, comprise magnet controlled reactor, one end of described magnet controlled reactor connects the output of wind generator system, and the other end is by connecting the main electrical network of grid-connected bus access electric power system;
The control of the controlled circuit I of described magnet controlled reactor, reactance value is at Z
min~ Z
maxbetween change, Z
minthe minimum reactance value of magnet controlled reactor, Z
maxit is the maximum reactance value for magnet controlled reactor, the output of the control end connection control circuit I of described magnet controlled reactor, the input of described control circuit I connects the secondary side of voltage transformer, a grid-connected bus of side joint of described voltage transformer, control circuit I obtains the magnitude of voltage of grid-connected bus by voltage transformer.
Described magnet controlled reactor is tandem type magnet controlled reactor, comprises magnet controlled reactor terminal I, magnet controlled reactor terminal II, magnet controlled reactor closed loop iron core and control circuit II; Described magnet controlled reactor closed loop iron core comprises four iron core column, and iron core column two ends have yoke to be communicated with four iron core column, and any two iron core column can both form magnetic flux closed loop mutually; Wherein an iron core column there is AC coil L1 and DC coil L3, another root iron core column has AC coil L2 and DC coil L4;
Described AC coil L1 Same Name of Ends connects magnet controlled reactor terminal I, AC coil L1 different name end connects AC coil L2 Same Name of Ends, AC coil L2 different name end connects an input of full bridge rectifier D3, another input of full bridge rectifier D3 connects magnet controlled reactor terminal II, two outputs of full bridge rectifier D3 connect the different name end of DC coil L3 and DC coil L4 respectively, and the Same Name of Ends of DC coil L3 and DC coil L4 links together; The thyristor D1 of a pair reverse parallel connection and thyristor D2 is parallel between two inputs of full bridge rectifier; The output of the control end connection control circuit I I of thyristor D1 and thyristor D2; The control of all controlled circuit I I of thyristor D1 and thyristor D2; The output of the input connection control circuit I of control circuit II, controlled circuit I controls.
The equal turn numbers of described AC coil L1 and AC coil L2, the equal turn numbers of DC coil L3 and DC coil L4.
Described AC coil L1 and the number of turn of AC coil L2 are 1/2 of the identical electric pressure transformer primary winding number of turn; The number of turn of described DC coil L3 and DC coil L4 is 2 times of AC coil L1.
Improve the method for wind generator system low voltage crossing with magnet controlled reactor, when wind generator system and the main electrical network of electric power system normally run, the magnitude of voltage U3 of bus is normal rating voltage U n, and the reactance value that control circuit I controls magnet controlled reactor is minimum value Z
min;
The main electrical network of electric power system is short-circuited fault, and when the magnitude of voltage U3 that control circuit I monitors bus is at Un ~ 0.5Un, control circuit I keeps the reactance value of magnet controlled reactor to be Z
min;
When the main electrical network of electric power system is short-circuited fault, when the magnitude of voltage U3 that control circuit I monitors bus is between 0 ~ 0.5Un, control circuit I controls the reactance value of magnet controlled reactor at Z
min~ Z
maxbetween.
When the magnitude of voltage U3 of bus is between 0 ~ 0.5Un, the reactance value Z that control circuit I controls magnet controlled reactor realizes by following controlling curve equation:
Wherein: Z
minthe minimum reactance value of magnet controlled reactor, Z
maxbe the maximum reactance value for magnet controlled reactor, Un is bus load voltage value, and U3 is bus virtual voltage measured value.
Described magnet controlled reactor is tandem type magnet controlled reactor, comprises magnet controlled reactor terminal I, magnet controlled reactor terminal II, magnet controlled reactor closed loop iron core and control circuit II; Described magnet controlled reactor closed loop iron core comprises four iron core column, and iron core column two ends have yoke to be communicated with four iron core column, and any two iron core column can both form magnetic flux closed loop mutually; Wherein an iron core column there is AC coil L1 and DC coil L3, another root iron core column has AC coil L2 and DC coil L4;
Described AC coil L1 Same Name of Ends connects magnet controlled reactor terminal I, AC coil L1 different name end connects AC coil L2 Same Name of Ends, AC coil L2 different name end connects an input of full bridge rectifier D3, another input of full bridge rectifier D3 connects magnet controlled reactor terminal II, two outputs of full bridge rectifier D3 connect the different name end of DC coil L3 and DC coil L4 respectively, and the Same Name of Ends of DC coil L3 and DC coil L4 links together; The thyristor D1 of a pair reverse parallel connection and thyristor D2 is parallel between two inputs of full bridge rectifier; The output of the control end connection control circuit I I of thyristor D1 and thyristor D2; The control of all controlled circuit I I of thyristor D1 and thyristor D2; The output of the input connection control circuit I of control circuit II, controlled circuit I controls.
The equal turn numbers of described AC coil L1 and AC coil L2, the equal turn numbers of DC coil L3 and DC coil L4.
Described AC coil L1 and the number of turn of AC coil L2 are 1/2 of the identical electric pressure transformer primary winding number of turn; The number of turn of described DC coil L3 and DC coil L4 is 2 times of AC coil L1.
When described control circuit II controls thyristor D1 and thyristor D2 full conducting, the reactance of magnet controlled reactor is maximum reactance value Z
max;
When control circuit II controls thyristor D1 and thyristor D2 full cut-off, the reactance of magnet controlled reactor is minimum value Zmin;
When control circuit II controls the size of thyristor D1 and the thyristor D2 angle of flow, the size of direct current in DC coil L3 and DC coil L4 can be controlled; Thus the reactance value of control magnet controlled reactor is at Z
min~ Z
maxbetween regulate.
Beneficial effect of the present invention:
Do not need to increase new control objectives and circuit to double-fed wind power generator own control systems, at and site the connect tandem type magnet controlled reactor of wind generator system with electric power system major network, solve the problem of wind generator system low voltage crossing.Control method can make the ability optimization of wind generator system low voltage crossing.Method to solve problems is simple, reliable.
Accompanying drawing explanation
Fig. 1 represents the structural representation of present system;
Fig. 2 is the structural representation of tandem type magnet controlled reactor in the present embodiment.
Wherein, 1. wind generator system, the 2. main electrical network of electric power system, 3. grid-connected bus, 4. magnet controlled reactor, 5. voltage transformer, 6. control circuit I, 7. magnet controlled reactor terminal I, 8. magnet controlled reactor terminal II, 9. magnet controlled reactor iron core, 10. control circuit II.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, wind generator system 1 is grid-connected at grid-connected bus 3 place with the main electrical network of electric power system 2.Wind generator system 1 and a series winding type magnet controlled reactor 4 that grid-connected bus 3 connecting line is connected, the controlled circuit I 6 of series winding type magnet controlled reactor 4 controls, and control circuit I6 obtains the magnitude of voltage of grid-connected bus 3 by voltage transformer 5.Control circuit I6 can control the reactance value of magnet controlled reactor 4 at Z
min~ Z
maxbetween regulate, change.
Tandem type magnet controlled reactor 4 can have many modes to realize.A kind of structure of tandem type magnet controlled reactor 4 and connected mode are as shown in Figure 2.Comprise magnet controlled reactor terminal I7, magnet controlled reactor terminal II 8, magnet controlled reactor closed loop iron core 9, control circuit II10.Magnet controlled reactor closed loop iron core 9 has four iron core column, and iron core column two ends have yoke to be communicated with four iron core column, and any two iron core column can both form magnetic flux closed loop mutually, as shown in Figure 2.Wherein an iron core column there is AC coil L1 and DC coil L3, another root iron core column has AC coil L2 and DC coil L4; The equal turn numbers of AC coil L1 and AC coil L2, the equal turn numbers of DC coil L3 and DC coil L4; AC coil L1 and the number of turn of AC coil L2 are 1/2 of the identical electric pressure transformer primary winding number of turn.The number of turn of DC coil L3 and DC coil L4 is 2 times of AC coil L1.
AC coil L1 Same Name of Ends connects magnet controlled reactor terminal I7, AC coil L1 different name end connects AC coil L2 Same Name of Ends, AC coil L2 different name end connects an input of full bridge rectifier D3, another input of full bridge rectifier D3 connects magnet controlled reactor terminal II 8, two outputs of full bridge rectifier D3 connect the different name end of DC coil L3 and DC coil L4 respectively, and the Same Name of Ends of DC coil L3 and DC coil L4 links together.The thyristor D1 of a pair reverse parallel connection and thyristor D2 is parallel to the input of full bridge rectifier.The control end connection control circuit I I10 of thyristor D1 and thyristor D2.Thyristor D1 and thyristor D2 respectively controlled circuit I I10 controls.The controlled circuit I 6 of control circuit II10 controls.
When the full conducting of control circuit II10 control thyristor D1 and thyristor D2, full bridge rectifier input is by thyristor D1 and the short circuit of thyristor D2 institute.The electric current flowing into magnet controlled reactor all circulates through thyristor D1 and thyristor D2, no longer flow into magnet controlled reactor DC coil L3 and DC coil L4, electric current in magnet controlled reactor DC coil is zero, the reactance of magnet controlled reactor is the maximum of device, this value is very large, can be expressed as infinity during approximate analysis.
When control circuit II10 controls thyristor D1 and thyristor D2 full cut-off, the alternating current flowing into magnet controlled reactor all inputs full bridge rectifier D3, provides direct current to after full bridge rectifier D3 rectification DC coil L3, DC coil L4; Magnet controlled reactor iron core is in the maximum saturation state of setting; The reactance of magnet controlled reactor is the minimum value of device, namely above-mentioned Z
min.The number of turn due to DC coil L3 and DC coil L4 is 2 times of AC coil L1, and the number of ampere turns of DC coil is greater than the number of ampere turns of AC coil, so magnet controlled reactor iron core is in degree of depth saturation condition always; The minimum reactance value Z of magnet controlled reactor
minvery little.Strengthen the multiple of the DC coil number of turn and AC coil, minimum reactance value Z can be reduced further
min.But economy is poor, so the number of turn of DC coil L3 and DC coil L4 is 2 times of AC coil L1, and economy and effect have better balance.
When control circuit II10 controls the size of thyristor D1 and the thyristor D2 angle of flow, the size of direct current in DC coil L3, DC coil L4 can be controlled.Thus the reactance value controlling magnet controlled reactor changes between the minimum value and infinitely large quantity of device.
Control circuit 7 controls the size of the thyristor D1 of reverse parallel connection and the conduction amount of thyristor D2, regulate the size flowing through thyristor D1 and thyristor D2 alternating current, realize regulating the size flowing through saturable reactor DC coil electric current, the reactance value of controllable transducer can be regulated continuously.For the maximal regulated reactance value Z that magnet controlled reactor 4 specifies
maxthe angle of flow by designing thyristor D1 and thyristor D2 is in advance accomplished.In fact, the thyristor D1 of magnet controlled reactor 4 and thyristor D2 is at reactance value Z
maxthe angle of flow and full cut-off between regulate and change.Namely, the reactance value of magnet controlled reactor 4 is in fact at Z
min~ Z
maxbetween regulate, change.
The method of wind generator system low voltage crossing is improved with magnet controlled reactor, when wind generator system 1 and the main electrical network 2 of electric power system normally run, the magnitude of voltage U3 of grid-connected bus 3 is normal rating voltage U n, and the reactance value that control circuit I6 controls series winding type magnet controlled reactor 4 has minimum value Z
min.Z
minlittle as far as possible, on wind generator system 1 and the main electrical network of electric power system 2 be incorporated into the power networks affect very little.
When the main electrical network 2 of electric power system is short-circuited fault, the magnitude of voltage U3 of grid-connected bus 3 declines.When the magnitude of voltage U3 that control circuit I6 measures grid-connected bus 3 by voltage transformer 5 is lower than 0.5Un, the reactance value controlling series winding type magnet controlled reactor 4 immediately increases, and the reactance value of magnet controlled reactor 4 is greater than Z
min.When control circuit I6 is equalled zero by the magnitude of voltage U3 that voltage transformer 5 measures grid-connected bus 3, the reactance value that control circuit I6 controls series winding type magnet controlled reactor 4 increases to the maximum Z of setting
max.Control circuit I6 measures the magnitude of voltage U3 of grid-connected bus 3 lower than 0.5Un by voltage transformer 5, and when being greater than zero, control circuit I6 controls the reactance value of series winding type magnet controlled reactor 4 at Z
min~ Z
maxbetween regulate.
When the main electrical network 2 of electric power system is short-circuited fault, the magnitude of voltage U3 of grid-connected bus 3 declines.Wind generator system 1 provides short circuit current by connecting line to the main electrical network 2 of electric power system.The magnet controlled reactor 4 if connecting line is not connected, the voltage of wind generator system 1 is very low, and wind-driven generator has larger short circuit current to flow through, and voltage ride through capability of wind driven generator is declined, and wind-driven generator likely trips, and departs from electrical network.
When the main electrical network 2 of electric power system is short-circuited fault, the magnitude of voltage U3 of grid-connected bus 3 declines.If connecting line series connection magnet controlled reactor 4, can limit wind-driven generator short circuit current, the voltage of wind generator system 1 can be controlled in more than 0.5 times of load voltage value, and wind-driven generator can not trip, and can not depart from electrical network.Improve the ability of wind generator system low voltage crossing.
The short trouble occurred when electric power system main electrical network 2 is cut, and the magnitude of voltage U3 of grid-connected bus suddenlys change and rises, and when being greater than 0.5*Un, the reactance value that control circuit I6 controls magnet controlled reactor 4 is minimum value Z
min.Wind generator system 1 and the main electrical network of electric power system 2 recover normal operation.
In order to ensure worst electric power system main electrical network 2 short trouble, the voltage of wind generator system 1 all ensures to control more than 0.5 times at load voltage value, and the reactance value of series winding type magnet controlled reactor 4 should get larger value.During in order to ensure electric power system main electrical network 2 short trouble, when reactor 4 is series at connecting line, wind generator system 1 and the main electrical network 2 of electric power system have and contact more closely, and the reactance value of series winding type magnet controlled reactor 4 should get less value.In order to balance this contradiction, realize the optimal control of series winding type magnet controlled reactor 4 reactance value, control circuit I cooperates with control circuit II, and the reactance value Z of magnet controlled reactor 4 realizes by following controlling curve equation:
Wherein: Z
minthe attainable minimum reactance value of magnet controlled reactor 4, Z
maxbe the maximal regulated reactance value for magnet controlled reactor 4 specifies, Un is grid-connected bus 3 load voltage value, and U3 is grid-connected bus 3 virtual voltage measured value.
Can find out, work as U3=0.5Un, Z=Z
min.Work as U3=0, Z=Z
max.When U3 changes between 0 and 0.5Un, Z is at Z
maxwith Z
minbetween linear change.Realize the optimal control of magnet controlled reactor 4 reactance value Z, improve wind generator system low voltage ride-through capability as far as possible.
Improve the system and method for wind generator system low voltage crossing with magnet controlled reactor, can realize completely.There is broad prospect of application.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. improve the system of wind generator system low voltage crossing with magnet controlled reactor, it is characterized in that, comprise magnet controlled reactor, one end of described magnet controlled reactor connects the output of wind generator system, and the other end is by connecting the main electrical network of grid-connected bus access electric power system;
The control of the controlled circuit I of described magnet controlled reactor, reactance value is at Z
min~ Z
maxbetween change, Z
minthe minimum reactance value of magnet controlled reactor, Z
maxit is the maximum reactance value for magnet controlled reactor, the output of the control end connection control circuit I of described magnet controlled reactor, the input of described control circuit I connects the secondary side of voltage transformer, a grid-connected bus of side joint of described voltage transformer, control circuit I obtains the magnitude of voltage of grid-connected bus by voltage transformer.
2. the system of wind generator system low voltage crossing is improved as claimed in claim 1 with magnet controlled reactor, it is characterized in that, described magnet controlled reactor is tandem type magnet controlled reactor, comprises magnet controlled reactor terminal I, magnet controlled reactor terminal II, magnet controlled reactor closed loop iron core and control circuit II; Described magnet controlled reactor closed loop iron core comprises four iron core column, and iron core column two ends have yoke to be communicated with four iron core column, and any two iron core column can both form magnetic flux closed loop mutually; Wherein an iron core column there is AC coil L1 and DC coil L3, another root iron core column has AC coil L2 and DC coil L4;
Described AC coil L1 Same Name of Ends connects magnet controlled reactor terminal I, AC coil L1 different name end connects AC coil L2 Same Name of Ends, AC coil L2 different name end connects an input of full bridge rectifier D3, another input of full bridge rectifier D3 connects magnet controlled reactor terminal II, two outputs of full bridge rectifier D3 connect the different name end of DC coil L3 and DC coil L4 respectively, and the Same Name of Ends of DC coil L3 and DC coil L4 links together; The thyristor D1 of a pair reverse parallel connection and thyristor D2 is parallel between two inputs of full bridge rectifier; The output of the control end connection control circuit I I of thyristor D1 and thyristor D2; The control of all controlled circuit I I of thyristor D1 and thyristor D2; The output of the input connection control circuit I of control circuit II, controlled circuit I controls.
3. improve the system of wind generator system low voltage crossing as claimed in claim 2 with magnet controlled reactor, it is characterized in that, the equal turn numbers of described AC coil L1 and AC coil L2, the equal turn numbers of DC coil L3 and DC coil L4.
4. as described in Claims 2 or 3, improve the system of wind generator system low voltage crossing with magnet controlled reactor, it is characterized in that, described AC coil L1 and the number of turn of AC coil L2 are 1/2 of the identical electric pressure transformer primary winding number of turn; The number of turn of described DC coil L3 and DC coil L4 is 2 times of AC coil L1.
5. based on the method for system improving wind generator system low voltage crossing described in claim 1 with magnet controlled reactor, it is characterized in that, when wind generator system and the main electrical network of electric power system normally run, the magnitude of voltage U3 of bus is normal rating voltage U n, and the reactance value that control circuit I controls magnet controlled reactor is minimum value Z
min;
The main electrical network of electric power system is short-circuited fault, and when the magnitude of voltage U3 that control circuit I monitors bus is at Un ~ 0.5Un, control circuit I keeps the reactance value of magnet controlled reactor to be Z
min;
When the main electrical network of electric power system is short-circuited fault, when the magnitude of voltage U3 that control circuit I monitors bus is between 0 ~ 0.5Un, control circuit I controls the reactance value of magnet controlled reactor at Z
min~ Z
maxbetween.
6. improve the method for wind generator system low voltage crossing as claimed in claim 5 with magnet controlled reactor, it is characterized in that, when the magnitude of voltage U3 of bus is between 0 ~ 0.5Un, the reactance value Z that control circuit I controls magnet controlled reactor realizes by following controlling curve equation:
Wherein: Z
minthe minimum reactance value of magnet controlled reactor, Z
maxbe the maximum reactance value for magnet controlled reactor, Un is bus load voltage value, and U3 is bus virtual voltage measured value.
7. the method for wind generator system low voltage crossing is improved as claimed in claim 6 with magnet controlled reactor, it is characterized in that, described magnet controlled reactor is tandem type magnet controlled reactor, comprises magnet controlled reactor terminal I, magnet controlled reactor terminal II, magnet controlled reactor closed loop iron core and control circuit II; Described magnet controlled reactor closed loop iron core comprises four iron core column, and iron core column two ends have yoke to be communicated with four iron core column, and any two iron core column can both form magnetic flux closed loop mutually; Wherein an iron core column there is AC coil L1 and DC coil L3, another root iron core column has AC coil L2 and DC coil L4;
Described AC coil L1 Same Name of Ends connects magnet controlled reactor terminal I, AC coil L1 different name end connects AC coil L2 Same Name of Ends, AC coil L2 different name end connects an input of full bridge rectifier D3, another input of full bridge rectifier D3 connects magnet controlled reactor terminal II, two outputs of full bridge rectifier D3 connect the different name end of DC coil L3 and DC coil L4 respectively, and the Same Name of Ends of DC coil L3 and DC coil L4 links together; The thyristor D1 of a pair reverse parallel connection and thyristor D2 is parallel between two inputs of full bridge rectifier; The output of the control end connection control circuit I I of thyristor D1 and thyristor D2; The control of all controlled circuit I I of thyristor D1 and thyristor D2; The output of the input connection control circuit I of control circuit II, controlled circuit I controls.
8. improve the method for wind generator system low voltage crossing as claimed in claim 7 with magnet controlled reactor, it is characterized in that, the equal turn numbers of described AC coil L1 and AC coil L2, the equal turn numbers of DC coil L3 and DC coil L4.
9. as described in claim 7 or 8, improve the system of wind generator system low voltage crossing with magnet controlled reactor, it is characterized in that, described AC coil L1 and the number of turn of AC coil L2 are 1/2 of the identical electric pressure transformer primary winding number of turn; The number of turn of described DC coil L3 and DC coil L4 is 2 times of AC coil L1.
10. improve the method for wind generator system low voltage crossing as claimed in claim 7 with magnet controlled reactor, it is characterized in that,
When described control circuit II controls thyristor D1 and thyristor D2 full conducting, the reactance of magnet controlled reactor is maximum reactance value Z
max;
When control circuit II controls thyristor D1 and thyristor D2 full cut-off, the reactance of magnet controlled reactor is minimum value Zmin;
When control circuit II controls the size of thyristor D1 and the thyristor D2 angle of flow, the size of direct current in DC coil L3 and DC coil L4 can be controlled; Thus the reactance value of control magnet controlled reactor is at Z
min~ Z
maxbetween regulate.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004025803A1 (en) * | 2002-09-13 | 2004-03-25 | Abb Ab | Wind power fed network |
| CN103066908A (en) * | 2012-12-11 | 2013-04-24 | 河北旭辉电气股份有限公司 | Quick response magnetic control electric reactor |
| CN103311956A (en) * | 2013-06-27 | 2013-09-18 | 国家电网公司 | Wind generation set grid-connected operation stability improving method, device and system |
| CN104184335A (en) * | 2014-09-11 | 2014-12-03 | 山东大学 | Multifunctional transformer with double transformer bodies connected in series |
| CN104283212A (en) * | 2014-10-11 | 2015-01-14 | 广西大学 | Double-fed wind power generation set physical simulation platform based on Compact RIO |
-
2015
- 2015-04-24 CN CN201510203178.0A patent/CN104795839B/en active Active - Reinstated
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004025803A1 (en) * | 2002-09-13 | 2004-03-25 | Abb Ab | Wind power fed network |
| CN103066908A (en) * | 2012-12-11 | 2013-04-24 | 河北旭辉电气股份有限公司 | Quick response magnetic control electric reactor |
| CN103311956A (en) * | 2013-06-27 | 2013-09-18 | 国家电网公司 | Wind generation set grid-connected operation stability improving method, device and system |
| CN104184335A (en) * | 2014-09-11 | 2014-12-03 | 山东大学 | Multifunctional transformer with double transformer bodies connected in series |
| CN104283212A (en) * | 2014-10-11 | 2015-01-14 | 广西大学 | Double-fed wind power generation set physical simulation platform based on Compact RIO |
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