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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- 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
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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 the field of power systems, and particularly relates to a generator power transmitting device and a transmitting method.
Background
The traditional generator power transmitter generates an analog quantity power signal by collecting generator terminal voltage and terminal measurement level current transformer current and utilizing a time division multiplier principle, and supplies the analog quantity power signal to a unit Distributed Control System (DCS) and a steam turbine digital electro-hydraulic control system (DEH) for use. When a fault occurs outside a generator set area, an adjacent transformer is in idle rush and the like, due to the fact that fault current is large or factors such as non-periodic components are contained, the current waveform of a current transformer at a measuring stage at the generator end is distorted, a power transmitter cannot truly reflect the current power of a generator and output wrong power, and even DEH or DCS misoperation is caused. According to field feedback, when multiple power grid faults occur in domestic thermal power generating units, the output distortion of a power transmitter causes the DEH steam valve quick control misoperation accident, and in some cases, the multiple units are shut down, so that the consequences are quite serious.
Chinese patent application No. 201410131932.X proposes a generator power transmission method based on overcurrent fault identification criterion, which adopts full-wave fourier algorithm, and the implementation method is simple, but there are some unsolved problems: (1) when the generator fails under the light-load working condition, the overcurrent fault identification criterion is low in sensitivity. Because the overcurrent constant value is generally set to be 1.1-1.3 times of the rated current of the generator, the power calculation current is calculated by adopting the current of the protection-level current transformer when the fault current is larger than the constant value. When a fault occurs under the light-load working condition of the generator and the fault component contains a non-periodic component, because the fault current is not large, the current of the protection-level current transformer is not larger than an overcurrent fixed value threshold, at the moment, the output of power 2 (obtained by calculating the three-phase voltage of the generator-end voltage transformer and the three-phase current of the generator-end protection-level current transformer) cannot be realized, and the measurement-level current transformer is saturated due to the influence of the non-periodic component, so that the current waveform is distorted, and finally the device outputs wrong power; (2) when the system frequency deviates or the system oscillates, the Fourier algorithm with fixed sampling frequency cannot adapt to the condition that the system frequency changes rapidly greatly, so that the calculated value of the three-phase current of the protection-level current transformer is large and small when appearing, and the calculated value is possibly larger than the overcurrent fixed value threshold, so that the power 2 is output by mistake. In addition, due to system frequency fluctuation, the positive sequence voltage and the positive sequence current of the generator terminal, which are obtained by calculation through a Fourier algorithm with fixed sampling frequency, are wrong values, so that the calculated power is also wrong values, and the device outputs wrong power at the moment.
Disclosure of Invention
The invention aims to provide a generator power transmitting device and a transmitting method, which can avoid the condition of judging misoperation under the condition of system frequency deviation or system oscillation and correctly output active power.
In order to achieve the above purpose, the solution of the invention is:
a generator power transmitting device comprising:
the detection unit is used for detecting the three-phase voltage of the generator terminal voltage transformer, the three-phase current of the generator terminal measurement level current transformer and the three-phase current of the protection level current transformer;
the calculation unit is used for calculating the fundamental wave phasor of the three-phase voltage of the voltage transformer at the generator end, the fundamental wave phasor of the three-phase current of the current transformer at the measurement level at the generator end and the fundamental wave phasor of the three-phase current of the current transformer at the protection level according to the voltage and the current obtained by the detection unit; the method comprises the following steps that three-phase current break variable and floating brake threshold of a computer-end protection-level current transformer, generator frequency, power 1, power 2 and power 3 are calculated, wherein the power 1 is obtained by calculating fundamental wave phasor of three-phase voltage of a machine-end voltage transformer and fundamental wave phasor of three-phase current of the machine-end measurement-level current transformer, the power 2 is obtained by calculating fundamental wave phasor of three-phase voltage of the machine-end voltage transformer and fundamental wave phasor of three-phase current of the machine-end protection-level current transformer, active power in the power 3 is obtained by calculating instantaneous value of three-phase voltage of the machine-end voltage transformer and instantaneous value of three-phase current of the machine-end measurement-level current transformer, and reactive power in the power 3 is obtained by calculating fundamental wave phasor of three-phase voltage of the machine; and
and the judging unit is used for comparing the break variable of the three-phase current of the generator terminal protection level current transformer with a floating brake threshold, when the current break variable is larger than the threshold, the judging unit outputs power 2, otherwise, the judging unit judges a frequency fluctuation identification criterion, and outputs power 3 if the criterion function is input and the criterion is satisfied, or outputs power 1.
A method of generator power transfer comprising the steps of:
step 1: collecting the three-phase voltage of a generator terminal voltage transformer, the three-phase current of a generator terminal measurement level current transformer and the three-phase current of a generator terminal protection level current transformer in real time;
step 2: calculating fundamental wave phasor of three-phase voltage of a voltage transformer at the generator terminal, fundamental wave phasor of three-phase current of a current transformer at the generator terminal measuring level and fundamental wave phasor of three-phase current of a current transformer at the generator terminal protecting level by adopting a Fourier algorithm;
and step 3: three-phase current break variable of a computer-end protection level current transformer;
and 4, step 4: calculating the frequency of the generator by adopting the three-phase voltage of a voltage transformer at the generator terminal;
and 5: calculating power 1, power 2 and power 3; the power 1 is obtained by calculating the fundamental wave phasor of the three-phase voltage of the terminal voltage transformer and the fundamental wave phasor of the three-phase current of the terminal measurement level current transformer; the power 2 is obtained by calculating the fundamental wave phasor of the three-phase voltage of the terminal voltage transformer and the fundamental wave phasor of the three-phase current of the terminal protection level current transformer; the active power in the power 3 is obtained by calculating the instantaneous value of the three-phase voltage of the generator terminal voltage transformer and the instantaneous value of the three-phase current of the generator terminal measurement level current transformer, and the reactive power in the power 3 is obtained by calculating the fundamental wave phasor of the three-phase voltage of the generator terminal voltage transformer and the fundamental wave phasor of the three-phase current of the generator terminal measurement level current transformer;
step 6: adopting a current break variable criterion with a floating brake threshold characteristic, outputting power 2 when the criterion is met, otherwise, turning to the step 7;
and 7: and (4) adopting a frequency fluctuation identification criterion, and outputting power 3 if the criterion is input and the criterion is met, or outputting power 1.
In the step 3, the formula of the current value of the three-phase current break variable of the computer-side protection level current transformer is as follows:
wherein the subscriptA, B or C is taken to respectively represent A, B, C triphase;is an operational function related to the current;a current calculation value of the function is obtained, and k is a current point identifier;the point number is a calculated value corresponding to (k-j × N), N is the number of sampling points of the power frequency cycle, and j is a fixed positive integer.
As described aboveAnd adopting a current instantaneous sampling operation function, a half-wave integral operation function, a full-wave integral operation function or a Fourier algorithm function.
In the step 5, the power 1 is calculated by the following formula:
wherein, P1Is the active power in power 1, Q1Is the reactive power in power 1, Re represents the real part of the phasor, Im represents the imaginary part of the phasor,are respectively fundamental wave phasors of three-phase voltage of a voltage transformer at the generator terminal,fundamental phasor of three-phase current of current transformer with measurement level at machine endThe complex conjugate of (a).
In the step 5, the power 2 is calculated by the following formula:
wherein, P2Is the active power in power 2, Q2Is the reactive power in power 2, Re represents the real part of the phasor, Im represents the imaginary part of the phasor,are respectively fundamental wave phasors of three-phase voltage of a voltage transformer at the generator terminal,fundamental phasor of three-phase current of current transformer with protection level at generator endThe complex conjugate of (a).
In the step 5, the power 3 is calculated by the following formula:
P3＝ugaima+ugbimb+ugcimc，
wherein, P3Is the active power in power 3, uga、ugb、ugcInstantaneous values of three-phase voltage of terminal voltage transformer, ima、imb、imcRespectively measuring instantaneous values of three-phase currents of the current transformer at the machine end; q3Is the reactive power in power 3, Im denotes the imaginary part of the phasor,are respectively fundamental wave phasors of three-phase voltage of a voltage transformer at the generator terminal,fundamental wave of three-phase current of current transformer with measurement level at machine end respectivelyPhasorsThe complex conjugate of (a).
In the step 6, the content of the current mutation criterion with the floating brake threshold characteristic is as follows:
wherein,the current value of the three-phase current break variable of the current transformer at the terminal protection level is k, the current point mark and the subscriptA, B or C is taken to respectively represent A, B, C triphase; k is a radical of1The value range is 0.05-2; k is a radical of2The value range is 0.05-0.3;is the current mutation value corresponding to the dot number (k-i x N); i is a fixed positive integer, and N is the number of sampling points of a power frequency cycle; i iseRated current for the generator;indicating the floating brake threshold.
In the step 7, the content of the frequency fluctuation identification criterion is:
|f-fn|＞Δfzd
wherein f is the current frequency of the generator, fnFor rated power of the generator, Δ fzdThe frequency fluctuation is fixed.
After the scheme is adopted, the fault identification criterion of the current break variable and the frequency fluctuation identification criterion with the floating brake threshold characteristic are adopted, the sensitivity of the fault identification criterion under the light-load working condition of the generator is improved, and the problems that the criterion malfunctions and the active power cannot be correctly output under the condition of system frequency deviation or system oscillation are solved.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
The invention provides a power transmission device of a generator, which comprises a detection unit, a calculation unit and a judgment unit, wherein the detection unit is used for detecting the three-phase voltage of a voltage transformer at the generator end, the three-phase current of a current transformer at a measuring level at the generator end and the three-phase current of a current transformer at a protection level at the generator end.
The calculation unit is used for calculating the fundamental wave phasor of the three-phase voltage of the voltage transformer at the generator terminal, the fundamental wave phasor of the three-phase current of the current transformer at the measurement stage at the generator terminal and the fundamental wave phasor of the three-phase current of the current transformer at the protection stage according to the voltage and the current obtained by the detection unit; the method comprises the steps that three-phase current break variable and floating brake threshold of a computer-end protection-level current transformer, generator frequency, power 1, power 2 and power 3 are calculated, wherein the power 1 is obtained by calculating fundamental wave phasor of three-phase voltage of a machine-end voltage transformer and fundamental wave phasor of three-phase current of a machine-end measurement-level current transformer, the power 2 is obtained by calculating fundamental wave phasor of three-phase voltage of the machine-end voltage transformer and fundamental wave phasor of three-phase current of the machine-end protection-level current transformer, active power in the power 3 is obtained by calculating instantaneous value of three-phase voltage of the machine-end voltage transformer and instantaneous value of three-phase current of the machine-end measurement-level current transformer, and reactive power in the power 3 is obtained by calculating fundamental wave phasor of three-phase voltage of the machine.
The judging unit is used for comparing the break variable of the three-phase current of the generator-end protection-level current transformer with a floating brake threshold, when the current break variable is larger than the threshold, judging the output power of the judging unit to be 2, otherwise, judging the frequency fluctuation identification criterion, and if the criterion is put into operation and the criterion is satisfied, outputting the power to be 3, otherwise, outputting the power to be 1.
Based on the transmitting device, as shown in fig. 1, the invention also provides a generator power transmitting method, which comprises the following steps:
step 1, collecting the three-phase voltage of a generator terminal voltage transformer, the three-phase current of a generator terminal measurement level current transformer and the three-phase current of a generator terminal protection level current transformer in real time;
step 2, calculating fundamental wave phasor of three-phase voltage of generator terminal voltage transformer by adopting Fourier algorithmFundamental phasor of three-phase current of current transformer with terminal measuring stageFundamental phasor of three-phase current of current transformer with protection level at terminal of generator
Step 3, according to the following formula, the current value of the three-phase current break variable of the computer terminal protection level current transformer:
wherein the subscriptA, B or C can be taken and respectively represent A, B, C three phases;is an operational function related to the current;a current calculation value of the function is obtained, and k is a current point identifier;the point number is a calculated value corresponding to (k-j × N), N is the number of sampling points of the power frequency cycle, and j is a fixed positive integer.
Function(s)The current can be a current instantaneous sampling operation function, a half-wave integral operation function, a full-wave integral operation function, a Fourier algorithm function, and the like, and the calculation method can be referred to in book "digital protection of transformers and medium and low voltage networks" (permissive, China water conservancy and hydropower press, chapter II, section six, section seven, and section ten).
Step 4, calculating the current frequency f of the generator according to the three-phase voltage of the voltage transformer at the generator terminal, wherein a zero crossing point algorithm or a Fourier algorithm and the like can be adopted;
step 5, calculating power 1 according to the fundamental wave phasor of the three-phase voltage of the terminal voltage transformer and the fundamental wave phasor of the three-phase current of the terminal measurement level current transformer according to the following formula:
wherein, P1Is the active power in power 1, Q1Is the reactive power in power 1, Re represents the real part of the phasor, Im represents the imaginary part of the phasor,are respectively asThe complex conjugate of (a).
According to the fundamental wave phasor of the three-phase voltage of the terminal voltage transformer and the fundamental wave phasor of the three-phase current of the terminal protection level current transformer, calculating power 2 according to the following formula:
wherein, P2Is the active power in power 2, Q2Is the reactive power in power 2, Re represents the real part of the phasor, Im represents the imaginary part of the phasor,are respectively asThe complex conjugate of (a).
According to the instantaneous value of the three-phase voltage of the terminal voltage transformer and the instantaneous value of the three-phase current of the terminal measurement level current transformer, calculating the active power in the power 3 according to the following formula:
P3＝ugaima+ugbimb+ugcimc
wherein, P3Is the active power in power 3, uga、ugb、ugcInstantaneous values of three-phase voltage of terminal voltage transformer, ima、imb、imcAnd respectively measuring instantaneous values of three-phase currents of the current transformer at the machine end.
According to the fundamental wave phasor of the three-phase voltage of the terminal voltage transformer and the fundamental wave phasor of the three-phase current of the terminal measurement level current transformer, calculating the reactive power in the power 3 according to the following formula:
wherein Q is3Is the reactive power in power 3, Im denotes the imaginary part of the phasor,are respectively asThe complex conjugate of (a).
Step 6, judging whether a current break variable criterion with a floating brake threshold characteristic is met, if so, outputting power 2, otherwise, turning to step 7; the content of the current break variable criterion with the floating brake threshold characteristic is as follows:
wherein the subscriptA, B or C can be taken and respectively represent A, B, C three phases; k is a radical of1The value range is 0.05-2; k is a radical of2The value range is 0.05-0.3;is the current mutation value corresponding to the dot number (k-i x N); i is a fixed positive integer; i iseRated current for the generator;indicating the floating brake threshold.
Step 7, adopting a frequency fluctuation identification criterion, and outputting power 3 if the criterion function is input and the criterion is met, or outputting power 1; wherein, the content of the frequency fluctuation identification criterion is as follows:
|f-fn|＞Δfzd
wherein f is the current frequency of the generator, fnFor rated power of the generator, Δ fzdThe frequency fluctuation is fixed. The frequency fluctuation identification criterion can be switched on or off according to actual field requirements.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (8)
1. A power transmission method of a generator is characterized by comprising the following steps:
step 1: collecting the three-phase voltage of a generator terminal voltage transformer, the three-phase current of a generator terminal measurement level current transformer and the three-phase current of a generator terminal protection level current transformer in real time;
step 2: calculating fundamental wave phasor of three-phase voltage of a voltage transformer at the generator terminal, fundamental wave phasor of three-phase current of a current transformer at the generator terminal measuring level and fundamental wave phasor of three-phase current of a current transformer at the generator terminal protecting level by adopting a Fourier algorithm;
and step 3: three-phase current break variable of a computer-end protection level current transformer;
and 4, step 4: calculating the frequency of the generator by adopting the three-phase voltage of a voltage transformer at the generator terminal;
and 5: calculating power 1, power 2 and power 3; the power 1 is obtained by calculating the fundamental wave phasor of the three-phase voltage of the terminal voltage transformer and the fundamental wave phasor of the three-phase current of the terminal measurement level current transformer; the power 2 is obtained by calculating the fundamental wave phasor of the three-phase voltage of the terminal voltage transformer and the fundamental wave phasor of the three-phase current of the terminal protection level current transformer; the active power in the power 3 is obtained by calculating the instantaneous value of the three-phase voltage of the generator terminal voltage transformer and the instantaneous value of the three-phase current of the generator terminal measurement level current transformer, and the reactive power in the power 3 is obtained by calculating the fundamental wave phasor of the three-phase voltage of the generator terminal voltage transformer and the fundamental wave phasor of the three-phase current of the generator terminal measurement level current transformer;
step 6: adopting a current break variable criterion with a floating brake threshold characteristic, outputting power 2 when the criterion is met, otherwise, turning to the step 7;
and 7: and (4) adopting a frequency fluctuation identification criterion, and outputting power 3 if the criterion is input and the criterion is met, or outputting power 1.
2. A method of transferring power from a generator as claimed in claim 1, wherein: in the step 3, the formula of the current value of the three-phase current break variable of the computer-end protection level current transformer is as follows:
wherein the subscriptA, B or C is taken to respectively represent A, B, C triphase;as a function of an operation related to the current；A current calculation value of the function is obtained, and k is a current point identifier;the point number is a calculated value corresponding to (k-j × N), N is the number of sampling points of the power frequency cycle, and j is a fixed positive integer.
3. A method of transferring power from a generator as claimed in claim 2, wherein: the above-mentionedAnd adopting a current instantaneous sampling operation function, a half-wave integral operation function, a full-wave integral operation function or a Fourier algorithm function.
4. A method of transferring power from a generator as claimed in claim 1, wherein: in step 5, the power 1 is calculated by using the following formula:
wherein, P1Is the active power in power 1, Q1Is the reactive power in power 1, Re represents the real part of the phasor, Im represents the imaginary part of the phasor,is the fundamental wave phasor of the three-phase voltage of the voltage transformer at the generator terminal,fundamental phasor of three-phase current of current transformer with measurement level at machine endThe complex conjugate of (a).
5. A method of transferring power from a generator as claimed in claim 1, wherein: in step 5, the power 2 is calculated by using the following formula:
wherein, P2Is the active power in power 2, Q2Is the reactive power in power 2, Re represents the real part of the phasor, Im represents the imaginary part of the phasor,are respectively fundamental wave phasors of three-phase voltage of a voltage transformer at the generator terminal,fundamental phasor of three-phase current of current transformer with protection level at generator endThe complex conjugate of (a).
6. A method of transferring power from a generator as claimed in claim 1, wherein: in step 5, the power 3 is calculated by using the following formula:
wherein, P3Is the active power in power 3, uga、ugb、ugcInstantaneous values of three-phase voltage of terminal voltage transformer, ima、imb、imcRespectively measuring instantaneous values of three-phase currents of the current transformer at the machine end; q3Is the reactive power in power 3, Im denotes the imaginary part of the phasor,are respectively fundamental wave phasors of three-phase voltage of a voltage transformer at the generator terminal,fundamental phasor of three-phase current of current transformer with measurement level at machine endThe complex conjugate of (a).
7. A method of transferring power from a generator as claimed in claim 1, wherein: in step 6, the content of the current mutation criterion with the floating brake threshold characteristic is as follows:
wherein,the current value of the three-phase current break variable of the current transformer at the terminal protection level is k, the current point mark and the subscriptA, B or C is taken to respectively represent A, B, C triphase; k is a radical of1The value range is 0.05-2; k is a radical of2The value range is 0.05-0.3;is the current mutation value corresponding to the dot number (k-i x N); i is a fixed positive integer, and N is the number of sampling points of a power frequency cycle; i iseRated current for the generator;indicating the floating brake threshold.
8. A method of transferring power from a generator as claimed in claim 1, wherein: in step 7, the content of the frequency fluctuation identification criterion is:
|f-fn|＞Δfzd
wherein f is the current frequency of the generator, fnFor rated power of the generator, Δ fzdThe frequency fluctuation is fixed.
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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***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 |
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| 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 |
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| 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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