CN203775098U - Generator power transmitting system - Google Patents
Generator power transmitting system Download PDFInfo
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- CN203775098U CN203775098U CN201420159062.2U CN201420159062U CN203775098U CN 203775098 U CN203775098 U CN 203775098U CN 201420159062 U CN201420159062 U CN 201420159062U CN 203775098 U CN203775098 U CN 203775098U
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- generator
- current transformer
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- transformer
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- 230000007935 neutral effect Effects 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 abstract description 23
- 238000005259 measurement Methods 0.000 abstract description 11
- 230000001105 regulatory effect Effects 0.000 description 13
- 238000005070 sampling Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 230000001052 transient effect Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
The utility model relates to a generator power transmitting system comprising a power transmitting device, a generator terminal protection class current transformer, a generator terminal measurement class current transformer and a generator terminal voltage transformer. The power transmitting device is connected with a generator through the generator terminal protection class current transformer, the generator terminal measurement class current transformer and the generator terminal voltage transformer. The power transmitting device collects the generator terminal three-phase voltage, the generator terminal protection class current transformer three-phase current and the generator terminal measurement class current transformer three-phase current through the generator terminal protection class current transformer, the generator terminal measurement class current transformer and the generator terminal voltage transformer, generates power calculation values and outputs the power calculation values for us of a generator power automatic regulation system. The generator power transmitting system can prevent exceptional great fluctuation of generator power caused by incorrect operation of the generator power automatic regulation system under the condition of system failure.
Description
Technical field
The utility model belongs to generator power and becomes feed technique field, relates to a kind of generator, relates in particular to a kind of generator power transmitting system.
Background technology
Along with Automation of Electric Systems degree improves day by day, power plant's power regulates remote auto frequency modulation to become basically universal automatically.But when system breaks down or during larger disturbance, the power regulating system of generator is followed action, and power toning often occurs, cause generator power fluctuation, unit operation is unstable.
Trace it to its cause and be: existing power becomes that to send scheme be by one, to measure CT(to measure a level current transformer) directly connect power transducer.The sampling front end of generator power regulating system is generally generator or transformer unit outlet power transducer, lower voltage when the system failure, current surge, and the fast saturation characteristic of measurement level current transformer (TA) that power transducer connects does not have transmitter sampling TA secondary current value correspondingly to increase by no-load voltage ratio, this just causes power transducer power output serious distortion.And then cause associated automatic regulating system irregular working, and cause the abnormal fluctuation of generator power, even can cause that generating set zero energy cuts organizational security and protect action and cut machine by mistake.In light of this situation, be necessary to study a kind of new power and become and send device, the sampling error in the time of guaranteeing again fault or disturbance transient state to meet the sampling precision of normal operation stable state within the specific limits, for power automatic regulation system provides safe and reliable sampled value.
In view of this, nowadays in the urgent need to designing a kind of new generator power transmitting system, to overcome the above-mentioned defect of existing transmitting system.
Utility model content
Technical problem to be solved in the utility model is: provide a kind of generator power transmitting system, the abnormal fluctuation of generator power that in the time of can preventing the system failure, generator power automatic regulating system incorrect operation causes.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A generator power transmitting system, described system comprises: power change send device, machine end protected level current transformer, machine end to measure a level current transformer, generator terminal voltage instrument transformer;
Described power change send device by described machine end protected level current transformer, machine end, to measure a level current transformer, generator terminal voltage instrument transformer connection generator respectively.
As a kind of preferred version of the present utility model, one end of described generator is connected with generator neutral point grounding transformer, this generator neutral point grounding transformer ground connection.
As a kind of preferred version of the present utility model, described generator terminal voltage instrument transformer one end ground connection.
The beneficial effects of the utility model are: the generator power transmitting system the utility model proposes; by increasing machine end protected level current transformer, the abnormal fluctuation of generator power that in the time of can preventing the system failure, generator power automatic regulating system incorrect operation causes.The utility model can make up the deficiency of power transducer transient state situation down-sampling distortion in the past, in the time of can ensureing to greatest extent stable state sampling precision and transient state, sampling reliably, prevents the generator power unusual fluctuations that the generator power automatic regulating system misoperation relevant to power transducer causes.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of the utility model generator power transmitting system.
In figure, G is generator, and t represents machine end, and n represents neutral point, and NGD is generator neutral point grounding transformer, TA
pfor protected level current transformer, TA
mfor measuring level current transformer, TV is generator terminal voltage instrument transformer, U
a, U
bwith UC be Generator end three-phase voltage, I
pa, I
pBand I
pCfor Generator end protected level CT three-phase current, I
mA, I
mBand I
mCfor Generator end is measured level CT three-phase current.
Embodiment
Below in conjunction with accompanying drawing, describe preferred embodiment of the present utility model in detail.
Embodiment mono-
Refer to Fig. 1, the utility model has disclosed a kind of generator power transmitting system, and described system comprises: power change send device, machine end protected level current transformer, machine end to measure a level current transformer, generator terminal voltage instrument transformer.
Described power change send device by described machine end protected level current transformer, machine end, to measure a level current transformer, generator terminal voltage instrument transformer connection generator respectively; Described generator terminal voltage instrument transformer one end ground connection.In addition, one end of described generator connects generator neutral point grounding transformer, this generator neutral point grounding transformer ground connection.
Embodiment bis-
Refer to Fig. 1, the utility model has disclosed a kind of generator power transmitting system, and described system comprises: power change send device, machine end protected level current transformer, machine end to measure a level current transformer, generator terminal voltage instrument transformer.
Described power change send device by described machine end protected level current transformer, machine end, to measure a level current transformer, generator terminal voltage instrument transformer connection generator respectively.In addition, one end of described generator connects generator neutral point grounding transformer, this generator neutral point grounding transformer ground connection.
Operation principle of the present utility model is: described power change send device to pass through described machine end protected level current transformer, machine end is measured a level current transformer, generator terminal voltage instrument transformer collection Generator end three-phase voltage, machine end protected level current transformer three-phase current and machine end and measured a grade current transformer three-phase current; Utilize all-round fourier algorithm to calculate the forward-order current of positive sequence voltage, machine end protected level current transformer, the forward-order current that machine end is measured level current transformer, and the first-harmonic effective value of the three-phase current of protected level current transformer; When being greater than, the three-phase current first-harmonic effective value of protected level current transformer switches threshold value I
settime; power calculation electric current is taken from protected level current transformer, otherwise power calculation electric current is taken from a measurement level current transformer, then by positive sequence voltage, power calculation forward-order current calculated power value; and power calculation value is exported in the mode of 4～20mA, for generator power automatic regulating system.
Particularly, described power change send device to comprise: acquisition module, computing module, performance number acquisition module, output module.
Acquisition module is measured level current transformer three-phase current in order to measure level current transformer, generator terminal voltage instrument transformer collection Generator end three-phase voltage, machine end protected level current transformer three-phase current and machine end by described machine end protected level current transformer, machine end;
Computing module is in order to utilize all-round fourier algorithm to calculate the forward-order current of positive sequence voltage, machine end protected level current transformer, the forward-order current that machine end is measured level current transformer, and the first-harmonic effective value of the three-phase current of protected level current transformer;
When being greater than, the three-phase current first-harmonic effective value of protected level current transformer switches threshold value I
set(I
setbe 1.1～1.3 times of rated current) time, performance number acquisition module obtains power calculation electric current according to following scheme: power calculation electric current is taken from protected level current transformer, otherwise power calculation electric current is taken from a measurement level current transformer; Again by positive sequence voltage, power calculation forward-order current calculated power value;
Output module is in order to power calculation value is exported, for generator power automatic regulating system.
The utility model also discloses a kind of generator power delivering method of generator power transmitting system, and described method comprises the steps:
[step S1] utilizes power change to send device to measure a level current transformer, generator terminal voltage instrument transformer collection Generator end three-phase voltage, machine end protected level current transformer three-phase current and machine end by machine end protected level current transformer, machine end and measures a grade current transformer three-phase current;
The forward-order current of the data that [step S2] gathers according to step S1, the forward-order current that utilizes all-round fourier algorithm calculating positive sequence voltage, machine end protected level current transformer, machine end measurement level current transformer, and the first-harmonic effective value of the three-phase current of protected level current transformer;
[step S3] switches threshold value I when the three-phase current first-harmonic effective value of protected level current transformer is greater than
set(I
setbe 1.1～1.3 times of rated current) time, power calculation electric current is taken from protected level current transformer, otherwise power calculation electric current is taken from a measurement level current transformer, then by positive sequence voltage, power calculation forward-order current calculated power value;
[step S4] is by the output of power calculation value, for generator power automatic regulating system.
Embodiment tri-
The utility model discloses a kind of generator power delivering method, and described method comprises: when generator normally moves, power calculation adopts measures level Current Transformer Secondary electric current, to guarantee the computational accuracy of steady operation; When the system failure, current surge; power calculation electric current automatically switches to protected level Current Transformer Secondary electric current; electric current switches back to after recovering normally again measures a level current transformer; adopt positive sequence voltage and forward-order current calculated power value; and performance number is exported in the mode of 4～20mA, for generator power automatic regulating system.
Power calculation electric current automatically switches according to the current first harmonics effective value size of protected level current transformer, adopts all-round fourier algorithm to calculate the current first harmonics effective value of protected level current transformer.
When being greater than, protected level Current Transformer Secondary current first harmonics effective value switches threshold value I
settime (I
setget 1.1～1.3 times of rated current), power calculation fetch protection level current transformer electric current; When being less than, protected level Current Transformer Secondary current first harmonics effective value switches threshold value I
settime, power calculation is got and is measured level current transformer electric current.
Embodiment tetra-
In Fig. 1, from Generator end TV, measure three-phase voltage
with
, from protected level TA(TA
p) measurement three-phase current
with
, from measuring level TA(TA
m) measurement three-phase current
with
, adopt all-round fourier algorithm to calculate the first-harmonic effective value I of the three-phase current of protected level TA
pA, I
pBand I
pC.
The switching of power calculation electric current is decided by protected level TA size of current, power calculation electric current I
φ .calselection criterion is:
Wherein, I
m φand I
p φbe respectively and measure level TA electric current and protected level TA electric current, I
pA, I
pBand I
pCbe respectively the three-phase current first-harmonic effective value of protected level TA, I
setfor switch current threshold, generally get 1.1～1.3 times of rated current.
Adopt all-round fourier algorithm to calculate positive sequence voltage and power calculation forward-order current, and then try to achieve positive-sequence power value, and with the mode output power value of 4-20mA, for generator power automatic regulating system.
In sum, the generator power transmitting system the utility model proposes, by increasing machine end protected level current transformer, the abnormal fluctuation of generator power that in the time of can preventing the system failure, generator power automatic regulating system incorrect operation causes.The utility model can make up the deficiency of power transducer transient state situation down-sampling distortion in the past, in the time of can ensureing to greatest extent stable state sampling precision and transient state, sampling reliably, prevents the generator power unusual fluctuations that the generator power automatic regulating system misoperation relevant to power transducer causes.
Here description of the present utility model and application is illustrative, not wants by scope restriction of the present utility model in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and for those those of ordinary skill in the art, the various parts of the replacement of embodiment and equivalence are known.Those skilled in the art are noted that in the situation that not departing from spirit of the present utility model or substantive characteristics, and the utility model can be with other form, structure, layout, ratio, and realizes with other assembly, material and parts.In the situation that not departing from the utility model scope and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (3)
1. a generator power transmitting system, is characterized in that, described system comprises: power change send device, machine end protected level current transformer, machine end to measure a level current transformer, generator terminal voltage instrument transformer;
Described power change send device by described machine end protected level current transformer, machine end, to measure a level current transformer, generator terminal voltage instrument transformer connection generator respectively.
2. generator power transmitting system according to claim 1, is characterized in that:
One end of described generator is connected with generator neutral point grounding transformer, this generator neutral point grounding transformer ground connection.
3. generator power transmitting system according to claim 1, is characterized in that:
Described generator terminal voltage instrument transformer one end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420159062.2U CN203775098U (en) | 2014-04-02 | 2014-04-02 | Generator power transmitting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420159062.2U CN203775098U (en) | 2014-04-02 | 2014-04-02 | Generator power transmitting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203775098U true CN203775098U (en) | 2014-08-13 |
Family
ID=51292243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420159062.2U Expired - Lifetime CN203775098U (en) | 2014-04-02 | 2014-04-02 | Generator power transmitting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203775098U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932915A (en) * | 2016-07-13 | 2016-09-07 | 珠海中瑞电力科技有限公司 | Power transmitting system and power transmitting method for power generator |
| CN106226593A (en) * | 2016-08-31 | 2016-12-14 | 江苏大唐国际吕四港发电有限责任公司 | Generator active power intelligent transfer device |
-
2014
- 2014-04-02 CN CN201420159062.2U patent/CN203775098U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932915A (en) * | 2016-07-13 | 2016-09-07 | 珠海中瑞电力科技有限公司 | Power transmitting system and power transmitting method for power generator |
| CN106226593A (en) * | 2016-08-31 | 2016-12-14 | 江苏大唐国际吕四港发电有限责任公司 | Generator active power intelligent transfer device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140813 |
|
| CX01 | Expiry of patent term |