CN105449724B - A kind of generator power pick-up device and delivering method - Google Patents
A kind of generator power pick-up device and delivering method Download PDFInfo
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- CN105449724B CN105449724B CN201510955997.0A CN201510955997A CN105449724B CN 105449724 B CN105449724 B CN 105449724B CN 201510955997 A CN201510955997 A CN 201510955997A CN 105449724 B CN105449724 B CN 105449724B
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
Abstract
The present invention discloses a kind of generator power delivering method; acquisition generator terminal voltage mutual inductor three-phase voltage, generator terminal measure grade current transformer three-phase current and generator terminal protected level current transformer three-phase current in real time first; its fundamental phasors, computer terminal protected level current transformer three-phase current Sudden Changing Rate, generator frequency, power 1, power 2 and power 3 are calculated separately again；Using the jump-value of current criterion with floating brake threshold characteristic, otherwise output power 2 when criterion meets use frequency fluctuation identical criterion, if criterion function input and criterion output power 3 when meeting, otherwise output power 1.The method can avoid the case where system frequency excursion or system oscillation criterion malfunction, correct active power of output.Invention additionally discloses a kind of generator power pick-up devices.
Description
Technical field
The invention belongs to field of power, more particularly to a kind of generator power pick-up device and delivering method.
Background technology
Conventional electric generators power transducer measures grade current transformer electric current by acquiring generator terminal voltage and generator terminal,
Analog quantity power signal, supply unit Distributed Control System (DCS) and steam turbine digital are generated using time division multiplier principle
Electrohydraulic control system (DEH) uses.When breaking down outside unit area, when the punching of adjacent transformers sky, due to fault current
It is big or contain the factors such as aperiodic component so that generator generator terminal measures grade current transformer current waveform and is distorted, and causes
Power transducer can not really reflect generator current power and output error power, even more so that DEH or DCS malfunctions.
It is fed back according to scene, since power transducer output distortion leads to DEH vapour when a lot of electric network faults have occurred for domestic fired power generating unit
The accident of the fast control malfunction of door, also causes the shutdown of more units, consequence is quite serious in some cases.
Chinese Patent Application No. 201410131932.X proposes a kind of generator work(based on over current fault identical criterion
Rate delivering method, this method use full wave Fourier algorithm, and implementation method is simple, but there is also some an open questions：(1) when
When generator light duty breaks down, over current fault identical criterion sensitivity is not high.It is 1.1 generally to be adjusted due to overcurrent definite value
~1.3 times of the rated current of generator, power calculation electric current just uses protected level electric current mutual when fault current need to be more than the definite value
Sensor electric current is calculated.When breaking down under generator light duty and containing aperiodic component in fault component, by
It is little in fault current, protected level current transformer electric current be not more than overcurrent definite value threshold, then cannot achieve at this time power 2 (by
Machine potential transformer three-phase voltage and generator terminal protected level current transformer three-phase current are calculated) output, and measure grade electricity
Current transformer is saturated due to being influenced by aperiodic component factor, and current waveform is caused to distort, resulting device output error power；
(2) when system frequency shifts or system oscillation, due to that can not adapt to be using the Fourier algorithm of fixed sampling frequency
Frequency of uniting substantially fast-changing situation, so that when protected level current transformer three-phase current calculated value is big when will appear
It is small, it is possible to which that calculated value is more than overcurrent definite value threshold, and power 2 is caused accidentally to export.Further, since system frequency fluctuates, using solid
Determine the generator generator terminal positive sequence voltage that the Fourier algorithm of sample frequency is calculated and the numerical value that forward-order current is mistake, therefore
The power of calculating is also the numerical value of mistake, leads to the power of device output error at this time.
Invention content
The purpose of the present invention is to provide a kind of generator power pick-up device and delivering method, can avoid in system
The case where criterion malfunctions in the case of frequency shift (FS) or system oscillation, correct active power of output.
In order to achieve the above objectives, solution of the invention is：
A kind of generator power pick-up device, including：
Detection unit, for detecting generator terminal voltage mutual inductor three-phase voltage, generator terminal measures grade current transformer three
Phase current and protected level current transformer three-phase current；
Computing unit, the voltage and current for being obtained according to detection unit calculate generator terminal voltage mutual inductor three
The fundamental phasors of phase voltage, generator terminal measure the fundamental phasors and protected level current transformer three-phase of grade current transformer three-phase current
The fundamental phasors of electric current；Computer terminal protected level current transformer three-phase current Sudden Changing Rate and floating brake threshold, generator frequency
Rate, power 1, power 2 and power 3, wherein power 1 is surveyed by the fundamental phasors and generator terminal of machine potential transformer three-phase voltage
The fundamental phasors of magnitude current transformer three-phase current are calculated, and power 2 is by the base of machine potential transformer three-phase voltage
The fundamental phasors of wave phasor and generator terminal protected level current transformer three-phase current are calculated, the active power in power 3 be by
The instantaneous value that the instantaneous value and generator terminal of machine potential transformer three-phase voltage measure grade current transformer three-phase current is calculated,
Reactive power in power 3 measures grade current transformer three-phase by the fundamental phasors and generator terminal of machine potential transformer three-phase voltage
The fundamental phasors of electric current are calculated；And
Judging unit is used for the Sudden Changing Rate of generator generator terminal protected level current transformer three-phase current and floating brake door
Sill compare, and when jump-value of current is more than threshold, otherwise judging unit output power 2, then differentiates frequency fluctuation identical criterion,
If criterion function input and criterion output power 3 when meeting, otherwise output power 1.
A kind of generator power delivering method, includes the following steps：
Step 1：Acquisition generator terminal voltage mutual inductor three-phase voltage, generator terminal measure grade current transformer three-phase electricity in real time
Stream and generator terminal protected level current transformer three-phase current；
Step 2：The fundamental phasors of generator terminal voltage mutual inductor three-phase voltage are calculated using Fourier algorithm, generator terminal is surveyed
The fundamental phasors of the fundamental phasors and generator terminal protected level current transformer three-phase current of magnitude current transformer three-phase current；
Step 3：Computer terminal protected level current transformer three-phase current Sudden Changing Rate；
Step 4：Generator frequency is calculated using generator terminal voltage mutual inductor three-phase voltage；
Step 5：Calculate power 1, power 2 and power 3；The power 1 is by machine potential transformer three-phase voltage
The fundamental phasors that fundamental phasors and generator terminal measure grade current transformer three-phase current are calculated；The power 2 is by generator terminal
The fundamental phasors of voltage transformer three-phase voltage and the fundamental phasors of generator terminal protected level current transformer three-phase current are calculated；
Active power is to measure grade current transformer by the instantaneous value and generator terminal of machine potential transformer three-phase voltage in the power 3
The instantaneous value of three-phase current is calculated, in the power 3 reactive power by machine potential transformer three-phase voltage fundamental wave
The fundamental phasors that phasor and generator terminal measure grade current transformer three-phase current are calculated；
Step 6：Using the jump-value of current criterion with floating brake threshold characteristic, output power 2 when criterion meets, otherwise
Go to step 7；
Step 7：Using frequency fluctuation identical criterion, if criterion function input and output power 3 when criterion meets, otherwise defeated
Go out power 1.
In above-mentioned steps 3, the formula of computer terminal protected level current transformer three-phase current Sudden Changing Rate current value is：
Wherein, subscriptA, B or C are taken, indicates A, B, C three-phase respectively；For with the relevant operation function of electric current；For
The current calculated value of function, k are current point identification；Be period be (k-j*N) corresponding calculated value, N be a work
Frequency cycle sampling number, j are a fixed positive integer.
It is above-mentionedUsing electric current instantaneous sampling operation function, half-wave integration operation function, full-wave integration operation function or Fu
In leaf algorithmic function.
In above-mentioned steps 5, power 1 is calculated using following formula：
Wherein, P1It is the active power in power 1, Q1It is the reactive power in power 1, Re indicates to take the real part of phasor, Im
Expression takes the imaginary part of phasor,The respectively fundamental phasors of generator terminal voltage mutual inductor three-phase voltage,Respectively generator terminal measures the fundamental phasors of grade current transformer three-phase currentConjugation
Plural number.
In above-mentioned steps 5, power 2 is calculated using following formula：
Wherein, P2It is the active power in power 2, Q2It is the reactive power in power 2, Re indicates to take the real part of phasor, Im
Expression takes the imaginary part of phasor,The respectively fundamental phasors of generator terminal voltage mutual inductor three-phase voltage,The respectively fundamental phasors of generator terminal protected level current transformer three-phase currentConjugate complex
Number.
In above-mentioned steps 5, power 3 is calculated using following formula：
P3=ugaima+ugbimb+ugcimc,
Wherein, P3It is the active power in power 3, uga、ugb、ugcThe respectively wink of machine potential transformer three-phase voltage
Duration, ima、imb、imcRespectively generator terminal measures the instantaneous value of grade current transformer three-phase current；Q3It is the idle work(in power 3
Rate, Im expressions take the imaginary part of phasor,The respectively fundamental wave of generator terminal voltage mutual inductor three-phase voltage
Phasor,Respectively generator terminal measures the fundamental phasors of grade current transformer three-phase current
Conjugate complex number.
In above-mentioned steps 6, the content of the jump-value of current criterion with floating brake threshold characteristic is：
Wherein,For generator terminal protected level current transformer three-phase current Sudden Changing Rate current value, k is current point identification,
SubscriptA, B or C are taken, indicates A, B, C three-phase respectively；k1For coefficient, value range is 0.05~2；k2For coefficient, value range
It is 0.05~0.3；Be period be (k-i*N) corresponding current break magnitude；I is a fixed positive integer, N
For a frequency cycle sampling number；IeFor the rated current of generator；Indicate floating brake door
Sill.
In above-mentioned steps 7, the content of frequency fluctuation identical criterion is：
|f-fn| > Δs fzd
Wherein, f is generator current frequency, fnFor generator rating power, Δ fzdFor frequency fluctuation definite value.
After adopting the above scheme, the present invention using the jump-value of current fault identification criterion with floating brake threshold characteristic and
Frequency fluctuation identical criterion improves fault identification criterion sensitivity under generator light duty, solves inclined in system frequency
Move or system oscillation in the case of criterion malfunction and can not correct active power of output the problem of.
Description of the drawings
Fig. 1 is the flow chart of the present invention.
Specific implementation mode
Below with reference to attached drawing, technical scheme of the present invention is described in detail.
The present invention provides a kind of generator power pick-up device, including detection unit, computing unit and judging unit,
In, detection unit is for detecting generator terminal voltage mutual inductor three-phase voltage, generator terminal measurement grade current transformer three-phase current
And generator terminal protected level current transformer three-phase current.
It is mutual to calculate generator terminal voltage for the voltage and current that the computing unit is used to be obtained according to the detection unit
The fundamental phasors of sensor three-phase voltage, generator terminal measure the fundamental phasors and protected level Current Mutual Inductance of grade current transformer three-phase current
The fundamental phasors of device three-phase current；Computer terminal protected level current transformer three-phase current Sudden Changing Rate and floating brake threshold, hair
Electric machine frequency, power 1, power 2 and power 3, wherein power 1 are the fundamental phasors and machine by machine potential transformer three-phase voltage
The fundamental phasors that end measures grade current transformer three-phase current are calculated, and power 2 is by machine potential transformer three-phase voltage
Fundamental phasors and the fundamental phasors of generator terminal protected level current transformer three-phase current be calculated, the active power in power 3
It is the instantaneous value calculating that grade current transformer three-phase current is measured by the instantaneous value and generator terminal of machine potential transformer three-phase voltage
It obtains, the reactive power in power 3 measures grade Current Mutual Inductance by the fundamental phasors and generator terminal of machine potential transformer three-phase voltage
The fundamental phasors of device three-phase current are calculated.
The judging unit is used for the Sudden Changing Rate of the generator generator terminal protected level current transformer three-phase current and floats
Dynamic braking threshold compares, and when jump-value of current is more than threshold, otherwise judgement unit output power 2, then differentiates that frequency fluctuation is known
Other criterion, if criterion function input and criterion output power 3 when meeting, otherwise output power 1.
Based on the above pick-up device, as shown in Figure 1, the present invention also provides a kind of generator power delivering methods, including such as
Lower step：
Step 1, acquisition generator terminal voltage mutual inductor three-phase voltage, generator terminal measure grade current transformer three-phase electricity in real time
Stream and generator terminal protected level current transformer three-phase current；
Step 2, the fundamental phasors of generator terminal voltage mutual inductor three-phase voltage are calculated using Fourier algorithmGenerator terminal measures the fundamental phasors of grade current transformer three-phase currentWith generator terminal protected level
The fundamental phasors of current transformer three-phase current
Step 3, computer terminal protected level current transformer three-phase current Sudden Changing Rate current value according to the following formula：
Wherein, subscriptDesirable A, B or C, indicate A, B, C three-phase respectively；For with the relevant operation function of electric current；For the current calculated value of function, k is current point identification；Be period be (k-j*N) corresponding calculated value, N
For a frequency cycle sampling number, j is a fixed positive integer.
FunctionCan be electric current instantaneous sampling operation function or half-wave integration operation function or full-wave integration operation function,
Or Fourier algorithm function etc., computational methods can be found in books《Transformer and middle low voltage network digital protecting》(Xu Zhengya, in
Water conservancy and hydropower publishing house of state, Section six of chapter 2, Section seven, protelum).
Step 4, generator current frequency f is calculated according to generator terminal voltage mutual inductor three-phase voltage, zero passage can be used
Point algorithm or Fourier algorithm etc.；
Step 5, grade current transformer three-phase is measured according to the fundamental phasors of machine potential transformer three-phase voltage and generator terminal
The fundamental phasors of electric current calculate power 1 according to following formula：
Wherein, P1It is the active power in power 1, Q1It is the reactive power in power 1, Re indicates to take the real part of phasor, Im
Expression takes the imaginary part of phasor,RespectivelyConjugate complex number.
According to the fundamental phasors of machine potential transformer three-phase voltage and generator terminal protected level current transformer three-phase current
Fundamental phasors calculate power 2 according to following formula：
Wherein, P2It is the active power in power 2, Q2It is the reactive power in power 2, Re indicates to take the real part of phasor, Im
Expression takes the imaginary part of phasor,RespectivelyConjugate complex number.
The wink of grade current transformer three-phase current is measured according to the instantaneous value of machine potential transformer three-phase voltage and generator terminal
Duration calculates the active power in power 3 according to following formula：
P3=ugaima+ugbimb+ugcimc
Wherein, P3It is the active power in power 3, uga、ugb、ugcThe respectively wink of machine potential transformer three-phase voltage
Duration, ima、imb、imcRespectively generator terminal measures the instantaneous value of grade current transformer three-phase current.
Grade current transformer three-phase current is measured according to the fundamental phasors of machine potential transformer three-phase voltage and generator terminal
Fundamental phasors calculate the reactive power in power 3 according to following formula：
Wherein, Q3It is the reactive power in power 3, Im indicates to take the imaginary part of phasor,RespectivelyConjugate complex number.
Step 6, judge whether to meet the jump-value of current criterion with floating brake threshold characteristic, the output power if meeting
2, otherwise go to step 7；Wherein, the content of the jump-value of current criterion with floating brake threshold characteristic is：
Wherein, subscriptDesirable A, B or C, indicate A, B, C three-phase respectively；k1For coefficient, value range is 0.05~2；k2
For coefficient, value range is 0.05~0.3；Be period be (k-i*N) corresponding current break magnitude；I is one
A fixed positive integer；IeFor the rated current of generator；Indicate floating brake threshold.
Step 7, using frequency fluctuation identical criterion, if criterion function input and output power 3 when criterion meets, otherwise defeated
Go out power 1；Wherein, the content of frequency fluctuation identical criterion is：
|f-fn| > Δs fzd
Wherein, f is generator current frequency, fnFor generator rating power, Δ fzdFor frequency fluctuation definite value.The frequency
Fluctuation identical criterion can be thrown according to actual field demand and move back.
Above example is merely illustrative of the invention's technical idea, and protection scope of the present invention cannot be limited with this, every
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention
Within.
Claims (8)
1. a kind of generator power delivering method, it is characterised in that include the following steps：
Step 1：In real time acquisition generator terminal voltage mutual inductor three-phase voltage, generator terminal measure grade current transformer three-phase current and
Generator terminal protected level current transformer three-phase current；
Step 2：The fundamental phasors of generator terminal voltage mutual inductor three-phase voltage are calculated using Fourier algorithm, generator terminal measures grade
The fundamental phasors of the fundamental phasors and generator terminal protected level current transformer three-phase current of current transformer three-phase current；
Step 3：Computer terminal protected level current transformer three-phase current Sudden Changing Rate；
Step 4：Generator frequency is calculated using generator terminal voltage mutual inductor three-phase voltage；
Step 5：Calculate power 1, power 2 and power 3；The power 1 is by the fundamental wave of machine potential transformer three-phase voltage
The fundamental phasors that phasor and generator terminal measure grade current transformer three-phase current are calculated；The power 2 is by set end voltage
The fundamental phasors of mutual inductor three-phase voltage and the fundamental phasors of generator terminal protected level current transformer three-phase current are calculated；It is described
Power 3 in active power be by machine potential transformer three-phase voltage instantaneous value and generator terminal measure grade current transformer three-phase
The instantaneous value of electric current is calculated, in the power 3 reactive power by machine potential transformer three-phase voltage fundamental phasors
The fundamental phasors that grade current transformer three-phase current is measured with generator terminal are calculated；
Step 6：Using the jump-value of current criterion with floating brake threshold characteristic, otherwise output power 2 when criterion meets are gone to
Step 7；
Step 7：Using frequency fluctuation identical criterion, if criterion function input and output power 3 when criterion meets, otherwise output work
Rate 1.
2. a kind of generator power delivering method as described in claim 1, it is characterised in that：In the step 3, computer terminal
The formula of protected level current transformer three-phase current Sudden Changing Rate current value is：
Wherein, subscriptA, B or C are taken, indicates A, B, C three-phase respectively；For with the relevant operation function of electric current；For function
Current calculated value, k are current point identification；Be period be (k-j*N) corresponding calculated value, N be a power frequency week
Wave sampling number, j are a fixed positive integer.
3. a kind of generator power delivering method as claimed in claim 2, it is characterised in that：It is describedIt is instantaneously adopted using electric current
Sample operation function, half-wave integration operation function, full-wave integration operation function or Fourier algorithm function.
4. a kind of generator power delivering method as described in claim 1, it is characterised in that：In the step 5, power 1 is adopted
It is calculated with following formula：
Wherein, P1It is the active power in power 1, Q1It is the reactive power in power 1, Re indicates that the real part of phasor, Im is taken to indicate
The imaginary part of phasor is taken,Not Wei generator terminal voltage mutual inductor three-phase voltage fundamental phasors,Respectively generator terminal measures the fundamental phasors of grade current transformer three-phase currentConjugation
Plural number.
5. a kind of generator power delivering method as described in claim 1, it is characterised in that：In the step 5, power 2 is adopted
It is calculated with following formula：
Wherein, P2It is the active power in power 2, Q2It is the reactive power in power 2, Re indicates that the real part of phasor, Im is taken to indicate
The imaginary part of phasor is taken,The respectively fundamental phasors of generator terminal voltage mutual inductor three-phase voltage,The respectively fundamental phasors of generator terminal protected level current transformer three-phase currentConjugation
Plural number.
6. a kind of generator power delivering method as described in claim 1, it is characterised in that：In the step 5, power 3 is adopted
It is calculated with following formula：
Wherein, P3It is the active power in power 3, uga、ugb、ugcThe respectively instantaneous value of machine potential transformer three-phase voltage,
ima、imb、imcRespectively generator terminal measures the instantaneous value of grade current transformer three-phase current；Q3It is the reactive power in power 3, Im
Expression takes the imaginary part of phasor,The respectively fundamental phasors of generator terminal voltage mutual inductor three-phase voltage,Respectively generator terminal measures the fundamental phasors of grade current transformer three-phase currentConjugation
Plural number.
7. a kind of generator power delivering method as described in claim 1, it is characterised in that：In the step 6, band, which floats, to be made
The content of the jump-value of current criterion of dynamic threshold characteristic is：
Wherein,For generator terminal protected level current transformer three-phase current Sudden Changing Rate current value, k is current point identification, subscript
A, B or C are taken, indicates A, B, C three-phase respectively；k1For coefficient, value range is 0.05~2；k2For coefficient, value range 0.05
~0.3；Be period be (k-i*N) corresponding current break magnitude；I is a fixed positive integer, and N is one
Frequency cycle sampling number；IeFor the rated current of generator；Indicate floating brake threshold.
8. a kind of generator power delivering method as described in claim 1, it is characterised in that：In the step 7, frequency fluctuation
The content of identical criterion is：
|f-fn| > Δs fzd
Wherein, f is generator current frequency, fnFor generator rating power, Δ fzdFor frequency fluctuation definite value.
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| 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 |
| CN106371016B (en) * | 2016-08-25 | 2019-02-19 | 南京南瑞继保电气有限公司 | Generator power pick-up device and delivering method based on difference current fault identification |
| CN106253776B (en) * | 2016-08-25 | 2018-09-11 | 国网浙江省电力公司电力科学研究院 | Generator power pick-up device and delivering method based on comprehensive harmonic failure identification |
| CN108983096B (en) * | 2018-07-27 | 2021-05-07 | 国电南瑞南京控制系统有限公司 | Method for determining power of high-voltage motor and measuring device |
| CN109001580B (en) * | 2018-09-26 | 2021-09-10 | 西安理工大学 | Intelligent electric quantity transmission device of generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1808821A (en) * | 2005-12-15 | 2006-07-26 | 南京南瑞继保电气有限公司 | Trip discrimination method for pure electric power system |
| CN103944467A (en) * | 2014-04-02 | 2014-07-23 | 南京保合太和电力科技有限公司 | Generator power transmitting system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1808821A (en) * | 2005-12-15 | 2006-07-26 | 南京南瑞继保电气有限公司 | Trip discrimination method for pure electric power system |
| CN103944467A (en) * | 2014-04-02 | 2014-07-23 | 南京保合太和电力科技有限公司 | Generator power transmitting system and method |
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