CN107748308A - A kind of grid power transmission QA system judged based on phase - Google Patents
A kind of grid power transmission QA system judged based on phase Download PDFInfo
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- CN107748308A CN107748308A CN201711139768.7A CN201711139768A CN107748308A CN 107748308 A CN107748308 A CN 107748308A CN 201711139768 A CN201711139768 A CN 201711139768A CN 107748308 A CN107748308 A CN 107748308A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
A kind of grid power transmission QA system judged based on phase of the present invention belongs to power system, TT＆C system and detection assessment technique field；In the grid power transmission QA system that this is judged based on phase, power plant's signal passes to controller by being wirelessly transferred channel and electrical grid transmission channel respectively；In channel is wirelessly transferred, including the first transformer, wireless transmitter module, wireless connection receive module, derivative module, the first absolute value block and the first comparison module；In electrical grid transmission channel, including power network, the second transformer, the second absolute value block and the second comparison module；In channel and electrical grid transmission channel is wirelessly transferred, in addition to the 3rd absolute value block；The grid power transmission QA system that the present invention is judged based on phase, can be used in evaluating grid power transmission quality.
Description
Technical field
A kind of grid power transmission QA system judged based on phase of the present invention belongs to power system, TT＆C system and inspection
Survey assessment technique field.
Background technology
The quality of power supply refers to the quality of electric energy in power system.Preferable electric energy should be perfect sinusoidal.Some interference
It is sinusoidal that factor can deviate waveform, thus just generates power quality problem.On the one hand which influence factor we are studied in the presence of
Power quality problem can be caused, on the one hand we study how to evaluate power quality problem.
The problem of for how to evaluate the quality of power supply, there are multiple power quality indexs to go to evaluate electric energy matter at this stage
Amount, including：Voltage interruption, frequency departure, voltage falling, voltage rising, transient pulse, voltage pulsation, voltage notches, harmonic wave,
M-Acetyl chlorophosphonazo, overvoltage and under-voltage.
At present, new quality of power supply evaluation method still constantly occurs.
The content of the invention
For the demand of quality of power supply evaluation, the present invention innovatively proposes a kind of brand-new quality of power supply evaluation hand
Section, and a kind of grid power transmission QA system judged based on phase is disclosed, the system can be entered to grid power transmission quality
Row evaluation.
The object of the present invention is achieved like this：
It is a kind of based on phase judge grid power transmission QA system, power plant's signal respectively by be wirelessly transferred channel and
Electrical grid transmission channel passes to controller；
In channel is wirelessly transferred,
Including the first transformer, wireless transmitter module, wireless connection receives module, derivative module, the first absolute value block and
First comparison module；The original phase information of the first transformer extraction power plant signal, the original phase information pass through nothing
Line transmitter module is launched, and receives module connection by wireless connection and receive, then is differentiated by derivative module, after differentiating
Signal gives controller after the first comparison module carries out Zero-cross comparator all the way, is carried out all the way by the first absolute value block exhausted
To giving controller after value computing；The derivative module includes operational amplifier U1, the homophase input of the operational amplifier U1
End connection ground, operational amplifier U1 inverting input are received the output end of module by electric capacity C connections wireless connection, pass through resistance
R1 concatenation operation amplifiers U1 output end, operational amplifier U1 output end export as differential, connect controller；Described
One comparison module includes operational amplifier U2, the operational amplifier U2 in-phase input end concatenation operation amplifier U1 output
End, operational amplifier U2 inverting input connection ground, operational amplifier U2 output end compare output, connection control as first
Device processed；First absolute value block includes operational amplifier U4 and operational amplifier U5, the same phase of the operational amplifier U4
Input passes through resistance R12 and resistance R15 concatenation operation amplifiers by resistance R12 concatenation operation amplifiers U1 output end
U5 in-phase input end, operational amplifier U4 inverting input are transported by resistance R11 connections ground by diode VD11 connections
Calculate amplifier U4 output end, operational amplifier U4 inverting input connection diode VD11 negative pole, operational amplifier U4
Output end connection diode VD11 positive pole, operational amplifier U4 output end connection diode VD12 negative pole, computing puts
The positive pole that big device U4 inverting input passes through resistance R13 connection diodes VD12；The anti-phase input of the operational amplifier U5
End is by resistance R14 connection diodes VD12 positive pole, and by resistance R16 concatenation operation amplifiers U5 output end, computing is put
Big device U5 output end exports as the first absolute value, connects controller；
In electrical grid transmission channel,
Including power network, the second transformer, the second absolute value block and the second comparison module；Power plant's signal passes through power network
Transmission, transmission phase information of the second transformer extraction power plant signal after electrical grid transmission, the transmission phase information
Controller is given after the second comparison module carries out Zero-cross comparator all the way, carries out absolute value by the second absolute value block all the way
Controller is given after computing；Second comparison module includes operational amplifier U3, the homophase input of the operational amplifier U3
The output of the second transformer of end connection, operational amplifier U3 inverting input connection ground, operational amplifier U3 output end are made
Compare output for second, connect controller；Second absolute value block includes operational amplifier U6 and operational amplifier U7, institute
Operational amplifier U6 in-phase input end is stated by the output of resistance R22 the second transformers of connection, passes through resistance R22 and resistance
R25 concatenation operation amplifiers U7 in-phase input end, operational amplifier U6 inverting input are led to by resistance R21 connections ground
Diode VD21 concatenation operation amplifiers U6 output end is crossed, operational amplifier U6 inverting input connection diode VD21's
Negative pole, operational amplifier U6 output end connection diode VD21 positive pole, operational amplifier U6 output end connection diode
VD22 negative pole, the positive pole that operational amplifier U6 inverting input passes through resistance R23 connection diodes VD22；The computing is put
Big device U7 inverting input passes through resistance R26 concatenation operation amplifiers U7 by resistance R24 connection diodes VD22 positive pole
Output end, operational amplifier U7 output end exports as the second absolute value, connects controller；
In channel and electrical grid transmission channel is wirelessly transferred,
Also include the 3rd absolute value block, the 3rd absolute value block includes operational amplifier U8, the operation amplifier
Device U8 in-phase input end connects the first absolute value block, and operational amplifier U8 inverting input connects the second absolute value mould
Block, operational amplifier U8 output end compare output as the 3rd, connect controller.
The above-mentioned grid power transmission QA system judged based on phase,
In the first absolute value block, it is desirable to：Resistance R16 and resistance R13 product are resistance R14 and resistance R11 products
2 times, it is ensured that output voltage be input voltage absolute value；
In the second absolute value block, it is desirable to：Resistance R26 and resistance R23 product are resistance R24 and resistance R21 products
2 times, it is ensured that output voltage be input voltage absolute value.
The grid power transmission QA system judged above based on phase, the first absolute value block and the second absolute value block
It is identical.
A kind of judged based on phase the electricity realized on the grid power transmission QA system judged more than based on phase
Net transmission of electricity quality evaluating method, comprises the following steps：
Step a, a cycle is segmented, hop count N, and N is 8 integral multiple, calculates the phase angle model being each segmented
Enclose n=2 π/N；
Step b, controller exports the original phase information for obtaining power plant's signal by differentialAnd according to：
Calculate and n1 is segmented residing for the original phase of power plant's signal, in formula, [] is downward rounding operation；
Step c, controller judges that the 3rd compares the positive and negative of output, and segmented compensation parameter is calculated according to lookup table mode
Specially：If：
3rd compare output be it is negative, controller calculate the first absolute value output and the second absolute value export ratio k, according to
Lookup table mode calculates segmented compensation parameter a；
3rd compares output for just, controller calculates the ratio k of the output of the second absolute value and the output of the first absolute value, according to
Lookup table mode calculates segmented compensation parameter a；
Or
Specially：If：
3rd compare output be it is negative, controller calculate the second absolute value output and the first absolute value export difference k, according to
Lookup table mode calculates segmented compensation parameter a；
3rd compares output for just, controller calculates the difference k of the output of the first absolute value and the output of the second absolute value, according to
Lookup table mode calculates segmented compensation parameter a；
Step d, controller judges that first compares output, second compares output and the 3rd and compare the positive and negative of output, calculates electricity
Segmentation residing for phase of factory's signal after electrical grid transmission
Specially：If：
First compares output, second compares output and the 3rd and compare output and be respectively：Just, power plant's signal passes through power network
Phase information after transmission calculates phase institute of power plant's signal after electrical grid transmission positioned at the first big segmentation according to n2=a
Punish section n2；
First compares output, second compares output and the 3rd and compare output and be respectively：Positive and negative, power plant's signal passes through power network
Phase information after transmission is located at second largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/4-a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Negative and positive is born, and power plant's signal passes through power network
Phase information after transmission is located at the third-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/4+a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Just, power plant's signal passes through power network to negative and positive
Phase information after transmission is located at the fourth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/2-a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Negative negative and positive, power plant's signal pass through power network
Phase information after transmission is located at the fifth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/2+a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Negative negative, power plant's signal passes through power network
Phase information after transmission is located at the sixth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=3N/4-a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Positive and negative negative, power plant's signal passes through power network
Phase information after transmission is located at the seventh-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=3N/4+a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Positive negative and positive, power plant's signal pass through power network
Phase information after transmission is located at the eighth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N-a
Residing segmentation n2；
Step e, electrical grid transmission quality is judged according to n1 and n2 difference.
According to the above-mentioned grid power transmission quality evaluating method judged based on phase, step e is specially：
The threshold value of n1 and n2 differences is set, and judges whether n1 and n2 difference exceedes threshold value, if：
N1 and n2 difference is not above threshold value, then electrical grid transmission effect is good；
N1 and n2 difference exceedes threshold value, and electrical grid transmission effect is bad.
Beneficial effect：
The invention discloses a kind of grid power transmission QA system judged based on phase, within the system, by power plant
Signal passes to controller by being wirelessly transferred channel and electrical grid transmission channel respectively, point obtained by being wirelessly transferred channel
Section, the segmentation obtained jointly with being wirelessly transferred channel and electrical grid transmission channel are contrasted, realize and grid power transmission quality is entered
Row evaluation.
Brief description of the drawings
Fig. 1 is the circuit diagram for the grid power transmission QA system that the present invention is judged based on phase.
Fig. 2 is the flow chart for the grid power transmission quality evaluating method that the present invention is judged based on phase.
Embodiment
The specific embodiment of the invention is described in further detail below in conjunction with the accompanying drawings.
Specific embodiment one
The present embodiment is the embodiment of the grid power transmission QA system judged based on phase.
The grid power transmission QA system judged based on phase of the present embodiment, circuit diagram at this as shown in figure 1, be based on
In the grid power transmission QA system that phase judges, power plant's signal is passed by being wirelessly transferred channel and electrical grid transmission channel respectively
Pass controller；
In channel is wirelessly transferred,
Including the first transformer, wireless transmitter module, wireless connection receives module, derivative module, the first absolute value block and
First comparison module；The original phase information of the first transformer extraction power plant signal, the original phase information pass through nothing
Line transmitter module is launched, and receives module connection by wireless connection and receive, then is differentiated by derivative module, after differentiating
Signal gives controller after the first comparison module carries out Zero-cross comparator all the way, is carried out all the way by the first absolute value block exhausted
To giving controller after value computing；The derivative module includes operational amplifier U1, the homophase input of the operational amplifier U1
End connection ground, operational amplifier U1 inverting input are received the output end of module by electric capacity C connections wireless connection, pass through resistance
R1 concatenation operation amplifiers U1 output end, operational amplifier U1 output end export as differential, connect controller；Described
One comparison module includes operational amplifier U2, the operational amplifier U2 in-phase input end concatenation operation amplifier U1 output
End, operational amplifier U2 inverting input connection ground, operational amplifier U2 output end compare output, connection control as first
Device processed；First absolute value block includes operational amplifier U4 and operational amplifier U5, the same phase of the operational amplifier U4
Input passes through resistance R12 and resistance R15 concatenation operation amplifiers by resistance R12 concatenation operation amplifiers U1 output end
U5 in-phase input end, operational amplifier U4 inverting input are transported by resistance R11 connections ground by diode VD11 connections
Calculate amplifier U4 output end, operational amplifier U4 inverting input connection diode VD11 negative pole, operational amplifier U4
Output end connection diode VD11 positive pole, operational amplifier U4 output end connection diode VD12 negative pole, computing puts
The positive pole that big device U4 inverting input passes through resistance R13 connection diodes VD12；The anti-phase input of the operational amplifier U5
End is by resistance R14 connection diodes VD12 positive pole, and by resistance R16 concatenation operation amplifiers U5 output end, computing is put
Big device U5 output end exports as the first absolute value, connects controller；
In electrical grid transmission channel,
Including power network, the second transformer, the second absolute value block and the second comparison module；Power plant's signal passes through power network
Transmission, transmission phase information of the second transformer extraction power plant signal after electrical grid transmission, the transmission phase information
Controller is given after the second comparison module carries out Zero-cross comparator all the way, carries out absolute value by the second absolute value block all the way
Controller is given after computing；Second comparison module includes operational amplifier U3, the homophase input of the operational amplifier U3
The output of the second transformer of end connection, operational amplifier U3 inverting input connection ground, operational amplifier U3 output end are made
Compare output for second, connect controller；Second absolute value block includes operational amplifier U6 and operational amplifier U7, institute
Operational amplifier U6 in-phase input end is stated by the output of resistance R22 the second transformers of connection, passes through resistance R22 and resistance
R25 concatenation operation amplifiers U7 in-phase input end, operational amplifier U6 inverting input are led to by resistance R21 connections ground
Diode VD21 concatenation operation amplifiers U6 output end is crossed, operational amplifier U6 inverting input connection diode VD21's
Negative pole, operational amplifier U6 output end connection diode VD21 positive pole, operational amplifier U6 output end connection diode
VD22 negative pole, the positive pole that operational amplifier U6 inverting input passes through resistance R23 connection diodes VD22；The computing is put
Big device U7 inverting input passes through resistance R26 concatenation operation amplifiers U7 by resistance R24 connection diodes VD22 positive pole
Output end, operational amplifier U7 output end exports as the second absolute value, connects controller；
In channel and electrical grid transmission channel is wirelessly transferred,
Also include the 3rd absolute value block, the 3rd absolute value block includes operational amplifier U8, the operation amplifier
Device U8 in-phase input end connects the first absolute value block, and operational amplifier U8 inverting input connects the second absolute value mould
Block, operational amplifier U8 output end compare output as the 3rd, connect controller.
In the first absolute value block, it is desirable to：Resistance R16 and resistance R13 product are resistance R14 and resistance R11 products
2 times, it is ensured that output voltage be input voltage absolute value；
In the second absolute value block, it is desirable to：Resistance R26 and resistance R23 product are resistance R24 and resistance R21 products
2 times, it is ensured that output voltage be input voltage absolute value.
First absolute value block is identical with the second absolute value block.
Specific embodiment two
The present embodiment is the embodiment of the grid power transmission quality evaluating method judged based on phase.
The present embodiment based on phase judge grid power transmission quality evaluating method, described in specific embodiment one based on
Realized on the grid power transmission QA system that phase judges, the grid power transmission quality evaluating method that should be judged based on phase, stream
Journey figure is as shown in Fig. 2 comprise the following steps：
Step a, a cycle is segmented, hop count N, and N is 8 integral multiple, calculates the phase angle model being each segmented
Enclose n=2 π/N；
Step b, controller exports the original phase information for obtaining power plant's signal by differentialAnd according to：
Calculate and n1 is segmented residing for the original phase of power plant's signal, in formula, [] is downward rounding operation；
Step c, controller judges that the 3rd compares the positive and negative of output, and segmented compensation parameter is calculated according to lookup table mode
Specially：If：
3rd compare output be it is negative, controller calculate the first absolute value output and the second absolute value export ratio k, according to
Lookup table mode calculates segmented compensation parameter a；
3rd compares output for just, controller calculates the ratio k of the output of the second absolute value and the output of the first absolute value, according to
Lookup table mode calculates segmented compensation parameter a；
Step d, controller judges that first compares output, second compares output and the 3rd and compare the positive and negative of output, calculates electricity
Segmentation residing for phase of factory's signal after electrical grid transmission
Specially：If：
First compares output, second compares output and the 3rd and compare output and be respectively：Just, power plant's signal passes through power network
Phase information after transmission calculates phase institute of power plant's signal after electrical grid transmission positioned at the first big segmentation according to n2=a
Punish section n2；
First compares output, second compares output and the 3rd and compare output and be respectively：Positive and negative, power plant's signal passes through power network
Phase information after transmission is located at second largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/4-a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Negative and positive is born, and power plant's signal passes through power network
Phase information after transmission is located at the third-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/4+a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Just, power plant's signal passes through power network to negative and positive
Phase information after transmission is located at the fourth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/2-a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Negative negative and positive, power plant's signal pass through power network
Phase information after transmission is located at the fifth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/2+a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Negative negative, power plant's signal passes through power network
Phase information after transmission is located at the sixth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=3N/4-a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Positive and negative negative, power plant's signal passes through power network
Phase information after transmission is located at the seventh-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=3N/4+a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Positive negative and positive, power plant's signal pass through power network
Phase information after transmission is located at the eighth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N-a
Residing segmentation n2；
Step e, electrical grid transmission quality is judged according to n1 and n2 difference, is specially：
The threshold value of n1 and n2 differences is set, and judges whether n1 and n2 difference exceedes threshold value, if：
N1 and n2 difference is not above threshold value, then electrical grid transmission effect is good；
N1 and n2 difference exceedes threshold value, and electrical grid transmission effect is bad.
Specific embodiment three
The present embodiment is the embodiment of the grid power transmission quality evaluating method judged based on phase.
The present embodiment based on phase judge grid power transmission quality evaluating method, described in specific embodiment one based on
Realized on the grid power transmission QA system that phase judges, while be also the electricity judged described in specific embodiment two based on phase
The specific implementation of net transmission of electricity quality evaluating method, the grid power transmission quality evaluating method that should be judged based on phase, is managed for evaluating
Grid power transmission quality in the case of thinking, this method flow chart is as shown in Fig. 2 comprise the following steps：
Step a, a cycle is segmented, hop count 32, it is 8 integral multiple condition to meet 32, calculates each segmentation
Phase angle range n=π/16；
Step b, controller exports the original phase information for obtaining power plant's signal by differentialAnd according to：
N1=[(17 π/32)/(π/16)]+1=9
Calculate and n1 is segmented residing for the original phase of power plant's signal, in formula, [] is downward rounding operation；
Step c, controller judges that the 3rd compares the positive and negative of output, and segmented compensation parameter is calculated according to lookup table mode
When, the output of the 3rd comparator is negative, and controller calculates the output of the first absolute value and the second absolute value
The ratio k of output, k=| cos (17 π/32) |/| sin (17 π/32) |=0.0985, calculate segmented compensation according to lookup table mode
Parameter a；The form is as follows：
| Ratio range | 0.0000-0.1989 | 0.1989-0.4142 | 0.4142-0.6682 | 0.6681-1.0000 |
| a | 1 | 2 | 3 | 4 |
By form, a=1 can be found；
Step d, controller judges that first compares output, second compares output and the 3rd and compare the positive and negative of output, calculates electricity
Segmentation residing for phase of factory's signal after electrical grid transmission
When, first compares output, second compares output and the 3rd and compare output and be respectively：Negative and positive is born, electricity
Phase information of factory's signal after electrical grid transmission is located at the third-largest segmentation, passes through according to n2=N/4+a to calculate power plant's signal
The residing segmentation n2 of phase after electrical grid transmission；I.e.：N2=32/4+1=9；
Step e, electrical grid transmission quality is judged according to n1 and n2 difference, is specially：
N1 and n2 are essentially equal, illustrate that electrical grid transmission effect is good.
Specific embodiment four
The present embodiment is the embodiment of the grid power transmission quality evaluating method judged based on phase.
The present embodiment based on phase judge grid power transmission quality evaluating method, described in specific embodiment one based on
Realized on the grid power transmission QA system that phase judges, while be also the electricity judged described in specific embodiment two based on phase
The specific implementation of net transmission of electricity quality evaluating method, the grid power transmission quality evaluating method that should be judged based on phase are non-for evaluating
Grid power transmission quality ideally, this method flow chart is as shown in Fig. 2 comprise the following steps：
Step a, a cycle is segmented, hop count 32, it is 8 integral multiple condition to meet 32, calculates each segmentation
Phase angle range n=π/16；
Step b, controller exports the original phase information for obtaining power plant's signal by differentialAnd according to：
N1=[(17 π/32)/(π/16)]+1=9
Calculate and n1 is segmented residing for the original phase of power plant's signal, in formula, [] is downward rounding operation；
Step c, controller judges that the 3rd compares the positive and negative of output, and segmented compensation parameter is calculated according to lookup table mode
When, the normalized output level of the first absolute value block is in theory | cos (17 π/32) |=
0.0980, the normalized output level of the second absolute value block is | sin (17 π/32) |=0.9952, and if however, electric energy exists
During electrical grid transmission, by impulse disturbances, the normalized output level of the second absolute value block is dragged down, become
0.2000, now, the output of the 3rd comparator remains as negative, controller the first absolute value of calculating output and the output of the second absolute value
Ratio k, k=0.0980/0.2000=0.4901, segmented compensation parameter a is calculated according to lookup table mode；The form is as follows：
| Ratio range | 0.0000-0.1989 | 0.1989-0.4142 | 0.4142-0.6682 | 0.6681-1.0000 |
| a | 1 | 2 | 3 | 4 |
By form, a=3 can be found；
Step d, controller judges that first compares output, second compares output and the 3rd and compare the positive and negative of output, calculates electricity
Segmentation residing for phase of factory's signal after electrical grid transmission
When, even if electric energy, during electrical grid transmission, by impulse disturbances, first compares output,
Two compare output and the 3rd compare output be also respectively：Negative and positive is born, and phase information of power plant's signal after electrical grid transmission is located at
The third-largest segmentation, n2 is segmented residing for phase of power plant's signal after electrical grid transmission to calculate according to n2=N/4+a；I.e.：N2=
32/4+3=11；
Step e, electrical grid transmission quality is judged according to n1 and n2 difference, is specially：
The threshold value of n1 and n2 differences is set, the difference for being set as 1, n1 and n2 in the present embodiment is 2, alreadys exceed threshold value, says
Bright electrical grid transmission effect is bad.
The present invention can be used in grid power transmission quality with specific data verification for specific embodiment three and specific embodiment four
Evaluation.More precisely, it is to be used to evaluate during grid power transmission, transmission of electricity quality evaluation during impulsive noise occurs.
Specific embodiment five
The present embodiment is the embodiment of the grid power transmission quality evaluating method judged based on phase.
The present embodiment based on phase judge grid power transmission quality evaluating method, described in specific embodiment one based on
Realized on the grid power transmission QA system that phase judges, the grid power transmission quality evaluating method that should be judged based on phase, stream
Journey figure is as shown in Fig. 2 comprise the following steps：
Step a, a cycle is segmented, hop count N, and N is 8 integral multiple, calculates the phase angle model being each segmented
Enclose n=2 π/N；
Step b, controller exports the original phase information for obtaining power plant's signal by differentialAnd according to：
Calculate and n1 is segmented residing for the original phase of power plant's signal, in formula, [] is downward rounding operation；
Step c, controller judges that the 3rd compares the positive and negative of output, and segmented compensation parameter is calculated according to lookup table mode
Specially：If：
3rd compare output be it is negative, controller calculate the second absolute value output and the first absolute value export difference k, according to
Lookup table mode calculates segmented compensation parameter a；
3rd compares output for just, controller calculates the difference k of the output of the first absolute value and the output of the second absolute value, according to
Lookup table mode calculates segmented compensation parameter a；
Step d, controller judges that first compares output, second compares output and the 3rd and compare the positive and negative of output, calculates electricity
Segmentation residing for phase of factory's signal after electrical grid transmission
Specially：If：
First compares output, second compares output and the 3rd and compare output and be respectively：Just, power plant's signal passes through power network
Phase information after transmission calculates phase institute of power plant's signal after electrical grid transmission positioned at the first big segmentation according to n2=a
Punish section n2；
First compares output, second compares output and the 3rd and compare output and be respectively：Positive and negative, power plant's signal passes through power network
Phase information after transmission is located at second largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/4-a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Negative and positive is born, and power plant's signal passes through power network
Phase information after transmission is located at the third-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/4+a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Just, power plant's signal passes through power network to negative and positive
Phase information after transmission is located at the fourth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/2-a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Negative negative and positive, power plant's signal pass through power network
Phase information after transmission is located at the fifth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N/2+a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Negative negative, power plant's signal passes through power network
Phase information after transmission is located at the sixth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=3N/4-a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Positive and negative negative, power plant's signal passes through power network
Phase information after transmission is located at the seventh-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=3N/4+a
The residing segmentation n2 in position；
First compares output, second compares output and the 3rd and compare output and be respectively：Positive negative and positive, power plant's signal pass through power network
Phase information after transmission is located at the eighth-largest segmentation, and phase of power plant's signal after electrical grid transmission is calculated according to n2=N-a
Residing segmentation n2；
Step e, electrical grid transmission quality is judged according to n1 and n2 difference, is specially：
The threshold value of n1 and n2 differences is set, and judges whether n1 and n2 difference exceedes threshold value, if：
N1 and n2 difference is not above threshold value, then electrical grid transmission effect is good；
N1 and n2 difference exceedes threshold value, and electrical grid transmission effect is bad.
Specific embodiment six
The present embodiment is the embodiment of the grid power transmission quality evaluating method judged based on phase.
The present embodiment based on phase judge grid power transmission quality evaluating method, described in specific embodiment one based on
Realized on the grid power transmission QA system that phase judges, while be also the electricity judged described in specific embodiment two based on phase
The specific implementation of net transmission of electricity quality evaluating method, the grid power transmission quality evaluating method that should be judged based on phase, is managed for evaluating
Grid power transmission quality in the case of thinking, this method flow chart is as shown in Fig. 2 comprise the following steps：
Step a, a cycle is segmented, hop count 32, it is 8 integral multiple condition to meet 32, calculates each segmentation
Phase angle range n=π/16；
Step b, controller exports the original phase information for obtaining power plant's signal by differentialAnd according to：
N1=[(17 π/32)/(π/16)]+1=9
Calculate and n1 is segmented residing for the original phase of power plant's signal, in formula, [] is downward rounding operation；
Step c, controller judges that the 3rd compares the positive and negative of output, and segmented compensation parameter is calculated according to lookup table mode
When, the output of the 3rd comparator is negative, and controller calculates the output of the second absolute value and the first absolute value
The difference k, k=of output | sin (17 π/32) |-| cos (17 π/32) |=0.8972, calculate segmented compensation according to lookup table mode
Parameter a；The form is as follows：
| Ratio range | 1.0000-0.7857 | 0.7857-0.5412 | 0.5412-0.2759 | 0.2759-0.0000 |
| a | 1 | 2 | 3 | 4 |
By form, a=1 can be found；
Step d, controller judges that first compares output, second compares output and the 3rd and compare the positive and negative of output, calculates electricity
Segmentation residing for phase of factory's signal after electrical grid transmission
When, first compares output, second compares output and the 3rd and compare output and be respectively：Negative and positive is born, electricity
Phase information of factory's signal after electrical grid transmission is located at the third-largest segmentation, passes through according to n2=N/4+a to calculate power plant's signal
The residing segmentation n2 of phase after electrical grid transmission；I.e.：N2=32/4+1=9；
Step e, electrical grid transmission quality is judged according to n1 and n2 difference, is specially：
N1 and n2 are essentially equal, illustrate that electrical grid transmission effect is good.
Specific embodiment seven
The present embodiment is the embodiment of the grid power transmission quality evaluating method judged based on phase.
The present embodiment based on phase judge grid power transmission quality evaluating method, described in specific embodiment one based on
Realized on the grid power transmission QA system that phase judges, while be also the electricity judged described in specific embodiment two based on phase
The specific implementation of net transmission of electricity quality evaluating method, the grid power transmission quality evaluating method that should be judged based on phase are non-for evaluating
Grid power transmission quality ideally, this method flow chart is as shown in Fig. 2 comprise the following steps：
Step a, a cycle is segmented, hop count 32, it is 8 integral multiple condition to meet 32, calculates each segmentation
Phase angle range n=π/16；
Step b, controller exports the original phase information for obtaining power plant's signal by differentialAnd according to：
N1=[(17 π/32)/(π/16)]+1=9
Calculate and n1 is segmented residing for the original phase of power plant's signal, in formula, [] is downward rounding operation；
Step c, controller judges that the 3rd compares the positive and negative of output, and segmented compensation parameter is calculated according to lookup table mode
When, the normalized output level of the first absolute value block is in theory | cos (17 π/32) |=
0.0980, the normalized output level of the second absolute value block is | sin (17 π/32) |=0.9952, and if however, electric energy exists
During electrical grid transmission, by impulse disturbances, the normalized output level of the second absolute value block is dragged down, become
0.2000, now, the output of the 3rd comparator remains as negative, controller the second absolute value of calculating output and the output of the first absolute value
Difference k, k=0.2000-0.0980=0.1020, segmented compensation parameter a is calculated according to lookup table mode；The form is as follows：
| Ratio range | 1.0000-0.7857 | 0.7857-0.5412 | 0.5412-0.2759 | 0.2759-0.0000 |
| a | 1 | 2 | 3 | 4 |
By form, a=4 can be found；
Step d, controller judges that first compares output, second compares output and the 3rd and compare the positive and negative of output, calculates electricity
Segmentation residing for phase of factory's signal after electrical grid transmission
When, even if electric energy, during electrical grid transmission, by impulse disturbances, first compares output,
Two compare output and the 3rd compare output be also respectively：Negative and positive is born, and phase information of power plant's signal after electrical grid transmission is located at
The third-largest segmentation, n2 is segmented residing for phase of power plant's signal after electrical grid transmission to calculate according to n2=N/4+a；I.e.：N2=
32/4+4=12；
Step e, electrical grid transmission quality is judged according to n1 and n2 difference, is specially：
The threshold value of n1 and n2 differences is set, the difference for being set as 1, n1 and n2 in the present embodiment is 3, alreadys exceed threshold value, says
Bright electrical grid transmission effect is bad.
The present invention can be used in grid power transmission quality with specific data verification for specific embodiment three and specific embodiment four
Evaluation.More precisely, it is to be used to evaluate during grid power transmission, transmission of electricity quality evaluation during impulsive noise occurs.
Claims (3)
1. a kind of grid power transmission QA system judged based on phase, it is characterised in that power plant's signal is respectively by wireless
Transmission channel and electrical grid transmission channel pass to controller；
In channel is wirelessly transferred,
Including the first transformer, wireless transmitter module, wireless connection receives module, derivative module, the first absolute value block and first
Comparison module；The original phase information of the first transformer extraction power plant signal, the original phase information is by wirelessly sending out
Module transmitting is penetrated, and module connection is received by wireless connection and received, then is differentiated by derivative module, the signal after differentiating
Controller is given after the first comparison module carries out Zero-cross comparator all the way, carries out absolute value by the first absolute value block all the way
Controller is given after computing；The in-phase input end that the derivative module includes operational amplifier U1, the operational amplifier U1 connects
Ground connection, operational amplifier U1 inverting input are received the output end of module by electric capacity C connections wireless connection, connected by resistance R1
Operational amplifier U1 output end is connect, operational amplifier U1 output end exports as differential, connects controller；First ratio
Compared with the in-phase input end concatenation operation amplifier U1 of module including operational amplifier U2, operational amplifier U2 output end,
Operational amplifier U2 inverting input connection ground, operational amplifier U2 output end compare output, connection control as first
Device；First absolute value block includes operational amplifier U4 and operational amplifier U5, and the operational amplifier U4's is same mutually defeated
Enter output end of the end by resistance R12 concatenation operation amplifiers U1, pass through resistance R12 and resistance R15 concatenation operation amplifiers U5
In-phase input end, operational amplifier U4 inverting input passes through diode VD11 concatenation operations by resistance R11 connections ground
Amplifier U4 output end, operational amplifier U4 inverting input connection diode VD11 negative pole, operational amplifier U4's
Output end connection diode VD11 positive pole, operational amplifier U4 output end connection diode VD12 negative pole, operation amplifier
The positive pole that device U4 inverting input passes through resistance R13 connection diodes VD12；The inverting input of the operational amplifier U5
By resistance R14 connection diodes VD12 positive pole, pass through resistance R16 concatenation operation amplifiers U5 output end, operation amplifier
Device U5 output end exports as the first absolute value, connects controller；
In electrical grid transmission channel,
Including power network, the second transformer, the second absolute value block and the second comparison module；Power plant's signal passes by power network
It is defeated, transmission phase information of the second transformer extraction power plant signal after electrical grid transmission, the transmission phase information one
Controller is given in road after the second comparison module carries out Zero-cross comparator, carries out absolute value fortune by the second absolute value block all the way
Controller is given after calculation；Second comparison module includes operational amplifier U3, the in-phase input end of the operational amplifier U3
Connect the output of the second transformer, operational amplifier U3 inverting input connection ground, operational amplifier U3 output end conduct
Second compares output, connects controller；Second absolute value block includes operational amplifier U6 and operational amplifier U7, described
Operational amplifier U6 in-phase input end passes through resistance R22 and resistance R25 by the output of resistance R22 the second transformers of connection
Concatenation operation amplifier U7 in-phase input end, operational amplifier U6 inverting input pass through two by resistance R21 connections ground
Pole pipe VD21 concatenation operation amplifiers U6 output end, operational amplifier U6 inverting input connection diode VD21's is negative
Pole, operational amplifier U6 output end connection diode VD21 positive pole, operational amplifier U6 output end connection diode
VD22 negative pole, the positive pole that operational amplifier U6 inverting input passes through resistance R23 connection diodes VD22；The computing is put
Big device U7 inverting input passes through resistance R26 concatenation operation amplifiers U7 by resistance R24 connection diodes VD22 positive pole
Output end, operational amplifier U7 output end exports as the second absolute value, connects controller；
In channel and electrical grid transmission channel is wirelessly transferred,
Also include the 3rd absolute value block, the 3rd absolute value block includes operational amplifier U8, the operational amplifier U8
In-phase input end connect the first absolute value block, operational amplifier U8 inverting input connects the second absolute value block, fortune
The output end for calculating amplifier U8 compares output as the 3rd, connects controller.
2. the grid power transmission QA system according to claim 1 judged based on phase,
Characterized in that,
In the first absolute value block, it is desirable to：Resistance R16 and resistance R13 product are the 2 of resistance R14 and resistance R11 products
Times, it is ensured that output voltage is the absolute value of input voltage；
In the second absolute value block, it is desirable to：Resistance R26 and resistance R23 product are the 2 of resistance R24 and resistance R21 products
Times, it is ensured that output voltage is the absolute value of input voltage.
3. the grid power transmission QA system according to claim 1 or 2 judged based on phase, it is characterised in that the
One absolute value block is identical with the second absolute value block.
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| CN101917011A (en) * | 2010-09-06 | 2010-12-15 | 东南大学 | Power quality comprehensive control method and device for electric railway traction power supply system |
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