CN205304667U - Generator exciting arrangement - Google Patents
Generator exciting arrangement Download PDFInfo
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- CN205304667U CN205304667U CN201520735129.7U CN201520735129U CN205304667U CN 205304667 U CN205304667 U CN 205304667U CN 201520735129 U CN201520735129 U CN 201520735129U CN 205304667 U CN205304667 U CN 205304667U
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- rectifier bridge
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Abstract
The utility model discloses a generator exciting arrangement relates to the synchronous machine excitation control field, aims at separating from original excitation system encouraging the function by force, effectively reduces the voltage and the capacity of transformer secondary side winding, and then reduce cost, improves system reliability. The utility model discloses the technical essential includes: normal excitation power source, a N rectifier bridge and controller, the first input end of a N rectifier bridge all is connected with normal excitation power source's one end, and the second input of N's rectifier bridge all is connected with normal excitation power source's the other end, N is for being greater than 0 integer, still including encouraging a power and a N+1 rectifier bridge by force, the first input end and the one end of encouraging the power by force of a N+1 rectifier bridge are connected, and the second input and the other end of encouraging the power by force of a N+1 rectifier bridge are connected, the normal phase output of a N+1 rectifier bridge links together, and the inverted output end links together, the controller has signal connection etc. With each rectifier bridge.
Description
Technical field
This utility model relates to synchronous machinery excitation control field, especially a kind of generator excitation unit.
Background technology
Synchronous generator excited system provides exciting current for electromotor. Time properly functioning, it is provided that adjustable DC excitation electric current, exciting current is generally less than rated exciting current, and when electromotor overload operation, exciting current likely reaches 1.1 times of rated current.
Excitation system also has a critical function, it is exactly when Generator end or electrical network are short-circuited, electromotor enters constrained current operation operating mode to be needed to provide higher field-forcing voltage and electric current, this voltage is likely to be breached 2-3 times of rated excitation voltage, and this electric current likely reaches 1.6-2 times of rated exciting current. The exciting current of excitation voltage and twice in order to meet twice, it is desirable to exciting transformer secondary side winding voltage high power capacity is big, far above the requirement of specified operation, so substantially increases equipment cost, operating condition is also due to voltage is high and become severe. Fig. 1 illustrates existing generator excitation unit.
Such as, existing self-shunt excitation system receives Generator end by exciting transformer, and the secondary side voltage design of exciting transformer is higher. Such as the electromotor of a 1000MW, its rated excitation voltage is about 500V, and rated exciting current is about 5000A, encourages by force design to meet, and the secondary side voltage of exciting transformer is up to 850V-950V, and the capacity of exciting transformer reaches 7200KVA-7800KVA. Time properly functioning, owing to exciting transformer secondary side voltage is significantly high, rectifier bridge pilot angle is about between 70 ��-80 ��, and rectifier bridge is controlling state deeply, and harmonic wave is very big, and commutation spike is very big, thus transformer efficiency factor is low, and loss is big, and cost is high. Owing to rectifier bridge is controlled deeply, also can produce the harmonic wave of exciting current, thus causing generator shaft voltage.
Utility model content
Goal of the invention of the present utility model is in that: for above-mentioned Problems existing, there is provided a kind of generator excitation unit, it is intended to separated from original excitation system by field-forcing function, effectively reduce voltage and the capacity of Circuit Fault on Secondary Transformer winding, and then reduction cost, improve system reliability.
The technical solution adopted in the utility model is such that normal field power supply, N number of rectifier bridge and controller; The first input end of N number of rectifier bridge is all connected with one end of normal field power supply, and the second input of the rectifier bridge of N is all connected with the other end of normal field power supply; Controller has signal with each rectifier bridge and is connected; N is the integer more than 0;
Also include encouraging by force power supply and the N+1 rectifier bridge; The first input end of N+1 rectifier bridge is connected with the one end encouraging by force power supply, and the second input of N+1 rectifier bridge is connected with the other end encouraging by force power supply;
The positive output end of N+1 rectifier bridge links together, and reversed-phase output links together; It is connected to load between positive output end and the reversed-phase output of N+1 rectifier bridge;
Described the N+1 rectifier bridge also has signal with controller and is connected; Described controller is connected with Generator end by voltage sampling circuit;
Normal field power supply voltage is lower than the described voltage encouraging by force power supply.
Further, described normal field power supply is the Exciting Windings for Transverse Differential Protection of the first transformator, described encourages by force the Exciting Windings for Transverse Differential Protection that power supply is the second transformator.
Further, described normal field power supply is the first secondary side winding of exciting transformer; Described exciting transformer also has the second secondary side winding, and encouraging by force power supply is that the first secondary side winding is connected with the second secondary side winding.
Further, described normal field power supply is the first secondary side winding of exciting transformer; Described transformator also has the second secondary side winding, and encouraging by force power supply is the second secondary side winding.
In sum, the beneficial effects of the utility model are:
Field-forcing function is separated by this utility model from original excitation system, namely the excitation unit in this utility model includes normal excitation part and encourages by force part, almost half has dropped in the power supply making normal excitation part, exciting transformer capacity is made to reduce the capacity of nearly half, reduce cost, reduce loss, improve the power factor run, harmonic wave when reducing properly functioning and peak overvoltage, bring very big superiority to generator excitation. When electromotor needs to encourage by force, independent rectifier bridge completing field-forcing function, N number of rectifier bridge in parallel is blocked operation, continues tens seconds at most owing to encouraging by force operating mode, independent rectifier bridge and encourage by force power supply and all have the ability of offer field-forcing voltage and electric current in the short time.
Accompanying drawing explanation
Fig. 1 is existing generator excitation unit.
Fig. 2 is the generator excitation unit in this utility model.
Labelling in figure:
1 ~ N+1 is the 1 ~ N+1 rectifier bridge.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described in detail.
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, this utility model is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain this utility model, be not used to limit this utility model.
Referring to Fig. 2, the excitation unit that this utility model provides includes normal field power supply, N+1 rectifier bridge and controller; The first input end of the 1st ~ N number of rectifier bridge is all connected with one end of normal field power supply, and the second input of the 1st ~ N number of rectifier bridge is all connected with the other end of normal field power supply;Controller has signal with each rectifier bridge and is connected; N is the integer more than 0.
Also include encouraging by force power supply; The first input end of N+1 rectifier bridge is connected with the one end encouraging by force power supply, and the second input of N+1 rectifier bridge is connected with the other end encouraging by force power supply.
The positive output end of N+1 rectifier bridge links together, and reversed-phase output links together; It is connected to load between positive output end and the reversed-phase output of N+1 rectifier bridge.
Described controller is connected with Generator end by voltage sampling circuit.
In a specific embodiment, described first setting value is the 75% of rated voltage, and the second setting value is the 85% of rated voltage.
Described supply voltage of encouraging by force higher than normal field power supply voltage, encourages by force requirement meeting electromotor. In other embodiments, the twice that supply voltage is normal field power supply voltage is encouraged by force.
Rectifier bridge in this utility model is identical with the rectifier bridge in existing excitation system, and its effect is that alternating current is converted to Rectified alternating current.
Normal field power supply in this utility model with encourage by force two separate secondary side winding that power supply can be same exciting transformer, the first secondary side winding of exciting transformer can also be used as normal field power supply, the first secondary side winding is connected as encouraging by force power supply with the second secondary side winding. The secondary side winding of an independent transformator can also be used as encouraging by force power supply, use another independent Circuit Fault on Secondary Transformer winding as normal field power supply.
This utility model is explained further below in conjunction with operation principle.
Described controller detection generator terminal voltage, if generator terminal voltage is more than the first setting value, such as rated voltage 85%, Shi Xiang 1 ~ N number of rectifier bridge output pulse control signal stops exporting pulse control signal to the N+1 rectifier bridge simultaneously, makes electromotor be in normal excitation operating mode.
If generator terminal voltage is less than the second setting value, such as the 75% of rated voltage, in time, stops exporting pulse control signal simultaneously to the N+1 rectifier bridge output pulse control signal to the 1st ~ N number of rectifier bridge, makes electromotor be in magnet excitation operating mode.
Considering that encouraging by force the time generally only lasts for tens seconds, is generally 10s ~ 20s, when encouraging by force operating mode, the persistent period encouraging by force operating mode is also monitored by controller while detection generator terminal voltage, it is judged that whether the persistent period meets setting value, such as 10s ~ 20s. When any one meets the two condition (generator terminal voltage is more than the first setting value and encourages by force the operating mode persistent period more than setting value), controller stops exporting pulse control signal to the N+1 rectifier bridge, exports pulse control signal to the 1st ~ N number of rectifier bridge.
The foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all any amendment, equivalent replacement and improvement etc. made within spirit of the present utility model and principle, should be included within protection domain of the present utility model.
Claims (4)
1. a generator excitation unit, including normal field power supply, N number of rectifier bridge and controller; The first input end of N number of rectifier bridge is all connected with one end of normal field power supply, and the second input of the rectifier bridge of N is all connected with the other end of normal field power supply; Controller has signal with described N number of rectifier bridge and is connected; N is the integer more than 0; It is characterized in that,
Also include encouraging by force power supply and the N+1 rectifier bridge;The first input end of N+1 rectifier bridge is connected with the one end encouraging by force power supply, and the second input of N+1 rectifier bridge is connected with the other end encouraging by force power supply;
The positive output end of N+1 rectifier bridge links together, and reversed-phase output links together; It is connected to load between positive output end and the reversed-phase output of N+1 rectifier bridge;
Described controller also has signal with the N+1 rectifier bridge and is connected; Described controller is connected with Generator end also by voltage sampling circuit;
Normal field power supply voltage encourages by force supply voltage lower than described.
2. a kind of generator excitation unit according to claim 1, it is characterised in that described normal field power supply is the Exciting Windings for Transverse Differential Protection of the first transformator, described encourages by force the Exciting Windings for Transverse Differential Protection that power supply is the second transformator.
3. a kind of generator excitation unit according to claim 1, it is characterised in that described normal field power supply is the first secondary side winding of exciting transformer; Described exciting transformer also has the second secondary side winding, and encouraging by force power supply is that the first secondary side winding is connected with the second secondary side winding.
4. a kind of generator excitation unit according to claim 1, it is characterised in that described normal field power supply is the first secondary side winding of exciting transformer; Described transformator also has the second secondary side winding, and encouraging by force power supply is the second secondary side winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520735129.7U CN205304667U (en) | 2015-09-22 | 2015-09-22 | Generator exciting arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520735129.7U CN205304667U (en) | 2015-09-22 | 2015-09-22 | Generator exciting arrangement |
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| Publication Number | Publication Date |
|---|---|
| CN205304667U true CN205304667U (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520735129.7U Active CN205304667U (en) | 2015-09-22 | 2015-09-22 | Generator exciting arrangement |
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| CN (1) | CN205304667U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910343A (en) * | 2021-01-08 | 2021-06-04 | 南京南瑞继保电气有限公司 | Bidirectional excitation loop of synchronous generator and synchronous generator set |
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2015
- 2015-09-22 CN CN201520735129.7U patent/CN205304667U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910343A (en) * | 2021-01-08 | 2021-06-04 | 南京南瑞继保电气有限公司 | Bidirectional excitation loop of synchronous generator and synchronous generator set |
| CN112910343B (en) * | 2021-01-08 | 2022-07-22 | 南京南瑞继保电气有限公司 | Bidirectional excitation loop of synchronous generator and synchronous generator set |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181122 Address after: 618000 No. 18, Third Section of Lushan South Road, Deyang City, Sichuan Province Co-patentee after: Dongfang Electric Group Dongfang Motor Co., Ltd. Patentee after: Dongfang Electric Automatic Control Engineering Co., Ltd. Address before: 618000 No. 138 Jialing Jiangxi Road, Jingyang District, Deyang City, Sichuan Province Co-patentee before: Dongfang Electric Group Dongfang Motor Co., Ltd. Patentee before: DFEM Control Equipment Co., Ltd. |