CN101924357A - Water turbine AC excitation power source protection method and water turbine for realizing same - Google Patents
Water turbine AC excitation power source protection method and water turbine for realizing same Download PDFInfo
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- CN101924357A CN101924357A CN2010102401696A CN201010240169A CN101924357A CN 101924357 A CN101924357 A CN 101924357A CN 2010102401696 A CN2010102401696 A CN 2010102401696A CN 201010240169 A CN201010240169 A CN 201010240169A CN 101924357 A CN101924357 A CN 101924357A
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- excitation power
- power source
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- protection method
- protective circuit
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- 230000005284 excitation Effects 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract 6
- 230000001681 protective effect Effects 0.000 claims description 31
- 238000004804 winding Methods 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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Abstract
The invention relates to a water turbine AC excitation power source protection method and a water turbine for realizing the same. The method comprises the following steps of: (a) detecting the rotor side current of the water turbine, and setting a current reference value; (b) when the detected current exceeds the reference value, blocking the output of an AC excitation power source, and putting a protection circuit into service through a switch device simultaneously; and (c) continuing to detect the rotor side current, opening the output of the AC excitation power source and controlling the switch device to cut off the protection circuit when the detected current is lower than the reference value. The water turbine using the AC excitation power source protection method can utilize the protection circuit to absorb a fault current and clamp rotor side voltage so as to protect the AC excitation power source under the situation of power grid failure or large rotor side current.
Description
Technical field
The present invention relates to a kind of hydraulic generator, particularly a kind of AC excitation hydraulic turbine.
Background technology
Development along with hydraulic turbine technology, hydraulic turbine variable frequency excitation technology comes into one's own day by day, the variable frequency excitation technology has overcome the shortcoming of traditional DC excitation technology, can allow the hydraulic turbine generate electricity in wideer working range, can significantly improve the economic benefit in hydroelectric station.But the needed frequency converter field power supply of variable frequency excitation technology is the comparison fragility, and its overload capacity is poor; This factor affecting is little under normal operation; but the hydraulic turbine can damage the variable frequency excitation power supply at high pressure and the big electric current that rotor-side produced when electrical network breaks down, and therefore presses for the safety that a kind of protective circuit of design guarantees hydraulic turbine frequency converter field power supply when electrical network breaks down.
Summary of the invention
The purpose of this invention is to provide a kind of AC excitation power source protection method and realize the hydraulic turbine of this method, in order to solve that hydraulic turbine ac excitation power supply is subject to fault effects and the problem damaged.
For achieving the above object, a kind of scheme of the present invention is: a kind of hydraulic turbine AC excitation power source protection method, and step is as follows:
A) detect hydroturbine rotor side electric current, and set a current reference value;
B) when detected electric current surpasses described reference value, block the output of ac excitation power supply, simultaneously by switching device with a protective circuit input;
C) continue detection rotor side electric current, when detected electric current was lower than reference value, output and the control switch device of opening ac excitation power supply excised protective circuit.
Adopt above-mentioned AC excitation power source protection method, can under electric network fault or the big current conditions of rotor-side, utilize protective circuit to absorb fault current and clamper rotor-side voltage, thus the protection ac excitation power supply.
Among described step b, the c, described protective circuit is in parallel with excitation winding, is used for the control protection electric circuit input and the switching device that cuts out is serially connected in protective circuit.Be provided with the protective resistance that is used to absorb big electric current in the described protective circuit.
For achieving the above object; another kind of scheme of the present invention is: a kind of hydraulic turbine of realizing the AC excitation power source protection method; comprise ac excitation power supply and excitation winding; a protective circuit is set on the circuit between ac excitation power supply and the excitation winding; protective circuit is in parallel with excitation winding; string is provided with switching device that is used for the control circuit break-make and the high-power resistance that is used to absorb exciting current in the protective circuit; a sampling module is arranged in the energized circuit; its output connects the input of a control module, and two outputs of control module are corresponding switching device and ac excitation power supply respectively.
Adopt the hydraulic turbine of above-mentioned AC excitation power source protection method, can under electric network fault or the big current conditions of rotor-side, utilize protective circuit to absorb fault current and clamper rotor-side voltage, thus the protection ac excitation power supply.
Described protective circuit comprises a rectifier, and input is connected on the output bus of ac excitation power supply, and two of the series circuit that described high-power resistance and described switching device constitute terminates on the output of rectifier.Described rectifier is the three-phase bridge rectifier that is made of six diodes.Described switching device is IGBT or thyristor.
Description of drawings
Fig. 1 is a hydraulic turbine protective circuit schematic diagram.
Embodiment
A kind of hydraulic turbine AC excitation power source protection method of the specific embodiment of the invention, step is as follows:
A) detect hydroturbine rotor side electric current, and set a current reference value;
B) when detected electric current surpasses described reference value, block the output of ac excitation power supply, simultaneously by switching device with a protective circuit input;
C) continue detection rotor side electric current, when detected electric current was lower than reference value, output and the control switch device of opening ac excitation power supply excised protective circuit.
A kind of hydraulic turbine B that realizes the AC excitation power source protection method; rotor side joint excitation winding; stator outputs to electrical network C; as shown in Figure 1; comprise ac excitation power supply A and excitation winding; a protective circuit in parallel with excitation winding is set between ac excitation power supply A and excitation winding; protective circuit comprises a rectifier D; input is connected on the output bus of ac excitation power supply A; two of the series circuit that is made of high-power protective resistance E and IGBT switch module F terminates on the output of rectifier D, and switch module F also can adopt thyristor.Rectifier D is the three-phase bridge rectifier that is made of six diodes.In addition, a sampling module G is set in energized circuit also, the rotor-side excitation winding electric current that is used for sampling, its output connects the input of a control module H, and this control module H has two outputs, respectively corresponding control switch device F and ac excitation power supply A.The output of control module H can connect the control end of IGBT; thereby it is the rotor-side current feedback that samples is defeated to the control of IGBT; can set a current reference value by control module H, when sampling hydroturbine rotor side electric current above reference value, the IGBT conducting; protective resistance E is put in the circuit; thereby sponge the big electric current and the clamper rotor-side voltage of rotor-side, be lower than reference value when sampling electric current, promptly electric current recovers normal; then IGBT turn-offs, and protective resistance E cuts out circuit.
Claims (7)
1. hydraulic turbine AC excitation power source protection method is characterized in that step is as follows:
A) detect hydroturbine rotor side electric current, and set a current reference value;
B) when detected electric current surpasses described reference value, block the output of ac excitation power supply, simultaneously by switching device with a protective circuit input;
C) continue detection rotor side electric current, when detected electric current was lower than reference value, output and the control switch device of opening ac excitation power supply excised protective circuit.
2. a kind of hydraulic turbine AC excitation power source protection method according to claim 1 is characterized in that among described step b, the c, described protective circuit is in parallel with excitation winding, is used for the control protection electric circuit input and the switching device that cuts out is serially connected in protective circuit.
3. a kind of hydraulic turbine AC excitation power source protection method according to claim 2 is characterized in that, is provided with the protective resistance that is used to absorb big electric current in the described protective circuit.
4. hydraulic turbine of realizing the AC excitation power source protection method; comprise ac excitation power supply and excitation winding; it is characterized in that; a protective circuit is set on the circuit between ac excitation power supply and the excitation winding; protective circuit is in parallel with excitation winding; string is provided with switching device that is used for the control circuit break-make and the high-power resistance that is used to absorb exciting current in the protective circuit; a sampling module is arranged in the energized circuit; its output connects the input of a control module, and two outputs of control module are corresponding described switching device and ac excitation power supply respectively.
5. a kind of hydraulic turbine of realizing the AC excitation power source protection method according to claim 4; it is characterized in that; described protective circuit comprises a rectifier; input is connected on the output bus of ac excitation power supply, and two of the series circuit that described high-power resistance and described switching device constitute terminates on the output of rectifier.
6. a kind of hydraulic turbine of realizing the AC excitation power source protection method according to claim 5 is characterized in that described rectifier is the three-phase bridge rectifier that is made of six diodes.
7. according to claim 4 or 5 or 6 described a kind of hydraulic turbines of realizing the AC excitation power source protection method, it is characterized in that described switching device is IGBT or thyristor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102401696A CN101924357A (en) | 2010-07-29 | 2010-07-29 | Water turbine AC excitation power source protection method and water turbine for realizing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102401696A CN101924357A (en) | 2010-07-29 | 2010-07-29 | Water turbine AC excitation power source protection method and water turbine for realizing same |
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| CN101924357A true CN101924357A (en) | 2010-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2010102401696A Pending CN101924357A (en) | 2010-07-29 | 2010-07-29 | Water turbine AC excitation power source protection method and water turbine for realizing same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104011374A (en) * | 2011-12-21 | 2014-08-27 | 开放水知识产权有限公司 | Hydroelectric turbine system |
| CN109340028A (en) * | 2018-11-05 | 2019-02-15 | 张家界天成机电设备制造有限公司 | A kind of transmission ratio-variable formula hydraulic turbine |
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| US7102247B2 (en) * | 2002-01-29 | 2006-09-05 | Vestas Wind Systems A/S | Circuit arrangement and methods for use in a wind energy installation |
| CN101090202A (en) * | 2007-04-30 | 2007-12-19 | 华中科技大学 | Flexible AC transmitting system based on flywheel energy storage |
| CN101383578A (en) * | 2008-09-22 | 2009-03-11 | 艾默生网络能源有限公司 | Dual-feeding motor system having protecting device and protecting method thereof |
| CN101621204A (en) * | 2009-08-14 | 2010-01-06 | 清华大学 | Method for designing crowbar resistor for passing through low voltage of double-fed type wind generator system |
| CN101630850A (en) * | 2009-08-07 | 2010-01-20 | 深圳市禾望电气有限公司 | Through power network fault device and through power network fault method of double-fed induction generator |
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2010
- 2010-07-29 CN CN2010102401696A patent/CN101924357A/en active Pending
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|---|---|---|---|---|
| US7102247B2 (en) * | 2002-01-29 | 2006-09-05 | Vestas Wind Systems A/S | Circuit arrangement and methods for use in a wind energy installation |
| CN101090202A (en) * | 2007-04-30 | 2007-12-19 | 华中科技大学 | Flexible AC transmitting system based on flywheel energy storage |
| CN101383578A (en) * | 2008-09-22 | 2009-03-11 | 艾默生网络能源有限公司 | Dual-feeding motor system having protecting device and protecting method thereof |
| CN101630850A (en) * | 2009-08-07 | 2010-01-20 | 深圳市禾望电气有限公司 | Through power network fault device and through power network fault method of double-fed induction generator |
| CN101621204A (en) * | 2009-08-14 | 2010-01-06 | 清华大学 | Method for designing crowbar resistor for passing through low voltage of double-fed type wind generator system |
Non-Patent Citations (1)
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| 王丹等: "双馈水轮发电机励磁系统设计", 《电气传动自动化》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104011374A (en) * | 2011-12-21 | 2014-08-27 | 开放水知识产权有限公司 | Hydroelectric turbine system |
| CN109340028A (en) * | 2018-11-05 | 2019-02-15 | 张家界天成机电设备制造有限公司 | A kind of transmission ratio-variable formula hydraulic turbine |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20121016 |
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Effective date of registration: 20121016 Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant after: Xuji Group Co., Ltd. Applicant after: State Grid Corporation of China Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant before: Xuji Group Co., Ltd. |
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Application publication date: 20101222 |