CN101136550A - Gas turbine generator synchronous voltage extracting method - Google Patents
Gas turbine generator synchronous voltage extracting method Download PDFInfo
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- CN101136550A CN101136550A CNA200710025661XA CN200710025661A CN101136550A CN 101136550 A CN101136550 A CN 101136550A CN A200710025661X A CNA200710025661X A CN A200710025661XA CN 200710025661 A CN200710025661 A CN 200710025661A CN 101136550 A CN101136550 A CN 101136550A
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Abstract
This invention relates to a method for withdrawing synchronous voltages from a gas-turbine generator and a network system, in which, in a high voltage system with a neutral point connected to the earth directly, the phase voltage of an assistant secondary winding of a bus voltage mutual inductor connected with the network system, namely the open-delta winding is 100V, which is same to the interphase voltage of type-Y winding of a voltage mutual inductor of the generator side, and the network system is used to test the phases of C-N phase voltage of the assistant secondary winding of the bus voltage mutual inductor namely the open-delta winding and c-b interphase voltage of the generator side the same and test the phase the same of A-N that of the mutual inductor and a-c interphase voltage of the generator side and the phase of B-N and b-a the same so as to withdraw synchronous voltages from the star winding combination of the open-delta winding of the voltage mutual inductor of the network side and that of the generator side.
Description
One, technical field
The present invention relates to the method that generator and network system are incorporated into the power networks, especially the abstracting method of both synchronous voltages more specifically is the abstracting method of the synchronous voltage of gas turbine generator and network system.
Two, background technology
The 9E gas turbine generator capacity that U.S. GE company manufactures and designs is big (135MW), its rated current is big (6645A) also, consider that investment establishes circuit breaker too greatly and no longer between its outlet and the step-up transformer (main transformer) during generator connecting in parallel with system, the power taking same period net system voltage of generator and network system and generator voltage are relatively, again because step-up transformer (main transformer) adopts the Ydl1 wiring mostly, between high-pressure side and low-pressure side in-phase voltage 30 ° phase difference is arranged, the same alternate phase difference that has 30 ° of generator and system's synchronous voltage just, prior art before this is: GE company is in same period that other 9E combustion gas wheel generation engineerings of China all adopt the mode that installs the corner transformer conversion same period additional to realize voltage, the league (unit of length) plant gas 9E of the Inner Mongol Soviet Union gas turbine generator group of GE company and the co-production of the applicant unit one belongs to also is to adopt this mode, but at the scene in the debugging, since Electric Power Design Institute to this same period Capacity design deficiency during corner transformer type selecting, cause same period corner transformer when for the first time trying the same period, to burn, order jumbo same period corner transformer again and can not satisfy the construction period of Power Plant generating.The existing design of the GE company voltage relationship between the open delta winding of the voltage between phases (the Y type winding of voltage transformer) of pusher side and network system side of never considering to generate electricity.Connecting mode was as follows when existing generator and network system were incorporated into the power networks: generator outlet is by step-up transformer (main transformer) system's (generally being the bus of 220KV) that is connected to the grid, the combustion machine control panel MKVI of GE company with the obtained synchronous voltage of the assembly same period (25) from the voltage of generator outlet voltage transformer and bus-bar potential transformer voltage through the corner transformer.Combustion machine control panel MKVI with the assembly same period (25) possess and " detect the frequency and the voltage of generating set and electrical network automatically; all meet to be incorporated into the power networks in its frequency, voltage, phase place and send switching signal ahead of time with the preceding more time of setting when requiring, make it to be incorporated into the power networks safely and reliably.When voltage, frequency, when phase place is undesirable, the automatic blocking closing pulse " function.But its prerequisite must be guarantee to insert two groups of voltages, the frequency of this assembly same period (25), phase place is correct and adjustable, and its scope that can adjust is very limited.
In a word, not only cost is higher for the also net mode of the existing employing corner transformer same period, and secondary connection is also complicated, and the error of voltage magnitude and phase angle also so to some extent increases.
Three, summary of the invention
The present invention seeks to: propose the method that a kind of gas turbine generator and network system are incorporated into the power networks, especially the abstracting method of gas turbine generator and network system synchronous voltage proposes a kind of combination method that saves the corner transformer.
The abstracting method of gas turbine generator and network system synchronous voltage, in the high-pressure system of neutral-point solid ground, the phase voltage amplitude of the auxiliary secondary winding (open delta winding) of the bus-bar potential transformer that network system connects is 100V, with the voltage between phases amplitude identical (also being 100V) of generating pusher side voltage transformer, and the C-N phase voltage of the auxiliary secondary winding of bus-bar potential transformer (open delta winding) is identical with the phase place of the c-b voltage between phases of generating pusher side.It is identical with the phase place of the a-c voltage between phases of generating pusher side that network system is surveyed auxiliary secondary winding (open delta winding) the A-N phase voltage of voltage transformer, it is identical with the phase place of the b-a voltage between phases of generating pusher side that network system is surveyed auxiliary secondary winding (open delta winding) the B-N phase voltage of voltage transformer, extract synchronous voltage in view of the above, be the corresponding line voltage combination of the star winding of the phase voltage of open delta winding of network system side voltage transformer and generating pusher side voltage transformer, constitute the extraction of synchronous voltage.This also is according to the configuration of generator and system voltage instrument transformer, and the conclusion that draws by vector analysis.
The present invention considers the voltage relationship between the open delta winding of generating voltage between phases (the Y type winding of voltage transformer) of pusher side and network system side, and the voltage between phases and the latter's the phase voltage of getting the former also can constitute and use voltage the same period.
By the inventive method, synchronous loop is made an amendment design, be foundation with the design principle of general synchronous device, finished gas turbine generator and network system is incorporated into the power networks.
Four, description of drawings
Fig. 1 has the synchronous loop schematic diagram now
Fig. 2 is the phase place schematic diagram of Fig. 1, and Fig. 2 A is that system voltage phase place, Fig. 2 B that bus-bar potential transformer T1 records is that system voltage phase place, Fig. 2 C that the same period, corner transformer T2 recorded is the generator voltage phase place that the generator voltage instrument transformer records;
Fig. 3 synchronous loop schematic diagram of the present invention
Fig. 4 is the phase place schematic diagram of synchronous loop of the present invention, and wherein Fig. 4 A is that system voltage phase place, Fig. 4 B that bus-bar potential transformer T1 records are the generator voltage phase places that the generator voltage instrument transformer records.
Main transformer T adopts the YD11 connection among the figure, turbo generator G, bus-bar potential transformer T1, the same period corner transformer T2, the same period assembly S, generator voltage instrument transformer T1, main transformer T;
Five, embodiment
Figure 1 shows that the intrinsic synchronous loop figure of Inner Mongol Soviet Union's league (unit of length) 9E gas turbine generator group, its right side is its phase vectors figure, the system voltage (synchronous voltage is taken from this winding) that diagram ABC vector records for bus-bar potential transformer star (Y) shape winding, the generator voltage that the abc vector records for generator voltage instrument transformer star (Y) type winding, as seen the same alternate phase difference that has 30 ° of ABC and abc, if do not install the corner transformer same period additional, then do not allow usefulness ABC and abc voltage synchronous voltage vector as generator! After installing the transformer same period additional, owing to the transformer adopting Yd11 mode of connection same period, the three-phase voltage of bus-bar potential transformer star (Y) shape winding 30 ° have been changeed, A ' B ' C ' vector is a voltage after the star winding voltage of bus-bar potential transformer turns over 30 ° through the corner transformer, the phase place of this voltage vector just in time with generator voltage abc same-phase, and it is 100V all that the voltage between phases amplitude also equates, so use A ' B ' C ' and abc to be fit to as the synchronous voltage vector of generator.
Synchronous device adopts conventional products, detects the frequency and the voltage of generating set and electrical network automatically, all meets to be incorporated into the power networks in frequency, voltage, phase place and sends switching signal ahead of time with the preceding more time of setting when requiring, and makes it to be incorporated into the power networks safely and reliably.When voltage, frequency, when phase place is undesirable, the automatic blocking closing pulse.The combustion machine control panel MKVI that produces as U.S. GE company with the assembly same period (25 type), be not limited thereto kind of a synchronous device certainly, other homemade synchronous device also is suitable for.
Because the system that 9E gas turbine generator group will be incorporated into the power networks mostly is the above high-pressure system of 110kV greatly, and the neutral grounding mode of the above high-pressure system of this 110kV is direct grounding way, the phase voltage amplitude of the auxiliary secondary winding of its system side bus-bar potential transformer (open delta winding) is 100V, voltage between phases amplitude identical (also being 100V) with generating pusher side voltage transformer, and the phase place of the C-N phase voltage of the auxiliary secondary winding of system side bus-bar potential transformer (open delta winding) and the c-b voltage between phases of generating pusher side is identical, and (in like manner: the A-N phase voltage that system surveys bus-bar potential transformer is identical with the phase place of the a-c voltage between phases of generating pusher side, the B-N phase voltage that system surveys bus-bar potential transformer is identical with the phase place of the b-a voltage between phases of generating pusher side), the open delta winding of extraction system side voltage transformer and generating pusher side voltage transformer star winding constitutes synchronous voltage in view of the above, cancelled the transformer (see figure 2) same period, the result once is incorporated into the power networks successfully.After the inventive method transformation, make the equipment of power generator synchronous loop reduce, reduced investment, secondary connection is simple, and increased the precision (precision that comprises voltage magnitude and phase angle) of voltage output because of the minimizing of equipment, make moment of being incorporated into the power networks become littler to the impact of generator and system, being incorporated into the power networks has higher success rate.
Given this league (unit of length) 9E of Inner Mongol Soviet Union gas turbine generator group synchronous loop is revised the good result that design obtains, through coordinating with GE company, after this 9E gas turbine generator group synchronous voltage is all revised design by this at the acquisition mode of system side, has obtained good effect.
Claims (2)
1. the abstracting method of gas turbine generator and network system synchronous voltage, in the high-pressure system of neutral-point solid ground, the auxiliary secondary winding of the bus-bar potential transformer that is connected with network system is that the phase voltage amplitude of open delta winding is 100V, identical with the voltage between phases amplitude of the Y type winding of generating pusher side voltage transformer, the auxiliary secondary winding that it is characterized in that utilizing network system to survey bus-bar potential transformer is that the phase place of c-b voltage between phases of the C-N phase voltage of open delta winding and the pusher side that generates electricity is identical, it is identical with the phase place of the a-c voltage between phases of generating pusher side that network system is surveyed the auxiliary secondary winding A-N phase voltage of voltage transformer, and it is identical with the phase place of the b-a voltage between phases of generating pusher side that network system is surveyed the auxiliary secondary winding B-N phase voltage of voltage transformer; Make up from the open delta winding of network system side voltage transformer and the star winding of generating pusher side voltage transformer in view of the above, extract synchronous voltage.
2. the abstracting method of gas turbine generator according to claim 1 and network system synchronous voltage is characterized in that described gas turbine generator is the 9E type gas turbine generator of 135MW, and adopts the 25 type assemblies same period of GE company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710025661XA CN101136550A (en) | 2007-08-10 | 2007-08-10 | Gas turbine generator synchronous voltage extracting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200710025661XA CN101136550A (en) | 2007-08-10 | 2007-08-10 | Gas turbine generator synchronous voltage extracting method |
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| CN101136550A true CN101136550A (en) | 2008-03-05 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166249A (en) * | 2011-12-14 | 2013-06-19 | 深圳市康必达中创科技有限公司 | Safe and stable control method of quick grid-connected system |
| CN106684927A (en) * | 2017-03-30 | 2017-05-17 | 山东中实易通集团有限公司 | Grid-connected system for large generator sets in isolated grid system and grid-connected method |
| CN111509780A (en) * | 2020-05-07 | 2020-08-07 | 西安邮电大学 | Synchronous constant value adjusting system and method based on transformer transformation ratio |
| CN112630584A (en) * | 2020-11-02 | 2021-04-09 | 安徽安庆皖江发电有限责任公司 | Generator end abnormity monitoring system and method and electronic equipment |
-
2007
- 2007-08-10 CN CNA200710025661XA patent/CN101136550A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166249A (en) * | 2011-12-14 | 2013-06-19 | 深圳市康必达中创科技有限公司 | Safe and stable control method of quick grid-connected system |
| CN103166249B (en) * | 2011-12-14 | 2016-03-16 | 深圳市康必达中创科技有限公司 | A kind of rapid combination system safety stable control method |
| CN106684927A (en) * | 2017-03-30 | 2017-05-17 | 山东中实易通集团有限公司 | Grid-connected system for large generator sets in isolated grid system and grid-connected method |
| CN111509780A (en) * | 2020-05-07 | 2020-08-07 | 西安邮电大学 | Synchronous constant value adjusting system and method based on transformer transformation ratio |
| CN112630584A (en) * | 2020-11-02 | 2021-04-09 | 安徽安庆皖江发电有限责任公司 | Generator end abnormity monitoring system and method and electronic equipment |
| CN112630584B (en) * | 2020-11-02 | 2023-10-20 | 国能神皖安庆发电有限责任公司 | Generator terminal abnormality monitoring system and method and electronic equipment |
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