CN113075449A - Portable electric quantity measuring instrument - Google Patents
Portable electric quantity measuring instrument Download PDFInfo
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Abstract
The invention relates to a portable electric quantity measuring instrument which structurally comprises an alternating current sampling module, a CPU (central processing unit) processing module, a timing module, a satellite timing module, a storage module, a battery management module and a man-machine interaction module; the signal output end of the alternating current sampling module is connected with the first signal input end of the CPU processing module, the signal output end of the CPU processing module is connected with the control signal input end of the alternating current sampling module, the signal output end of the timing module is connected with the second signal input end of the CPU processing module, the signal output end of the satellite time service module is connected with the third signal input end of the CPU processing module, the signal output end of the storage module is connected with the fourth signal input end of the CPU processing module, and the signal output end of the battery management module is connected with the fifth signal input end of the CPU processing module; and the CPU processing module runs an integral calculation module. The advantages are that: the invention can measure the electric energy which is leaked in the replacement process of the electric energy meter in a short time.
Description
Technical Field
The invention relates to a portable electric quantity measuring instrument, and belongs to the technical field of power equipment.
Background
The current electric energy meter replacement method is based on the premise that normal electricity consumption of a power user is not influenced by meter replacement, so that a part of electric quantity actually used by the user in the meter replacement process cannot be measured in the electric energy meter, if the part of lost electric quantity is calculated inaccurately, great economic loss can be brought to the power user, a power generation enterprise and the power enterprise, the fairness of power transaction is directly influenced, and meanwhile, adverse effects can be brought to the image of the power supply enterprise.
In view of economic benefits and management, power enterprises attach more and more importance to economic losses brought by the electric energy meter replacement process, and more scientific research units are focusing on researching how to conveniently and accurately measure the electric quantity missed in the meter replacement process; at present, there is no relevant literature and patent granted for a while abroad, and there are similar analytical instruments for measuring electric energy when the electric energy meter is replaced, such as: the granted patent CN209446667U discloses an electric energy metering analyzer with time-sharing pricing, but according to the regulation of the power industry standard DL/T448-2016 "technical management rules of electric energy metering devices" of the people's republic of china, no device irrelevant to electric energy metering can be accessed in the metering loop, so as to avoid affecting the accuracy and reliability of electric energy metering, in addition, the instrument is directly accessed in the metering loop through a joint junction box, there is a fixed requirement on the wiring form of the metering loop, and the actual field wiring form is various, therefore, the scheme is limited in use in actual work, and the patent CN205384319U discloses a meter-changing electric energy metering device, but the method is higher in cost; patent application CN106370926A discloses an electric energy meter changing operation missing-metering electric quantity recorder and a using method thereof, but the reliability of instrument access, time-sharing metering of electric quantity and accuracy grade requirements of instrument and equipment metering are not considered in the present invention, generally speaking, the research for missing-metering electric quantity in meter changing process at home and abroad still lacks a high-efficiency and accurate metering method and a corresponding metering device, along with the continuous development of smart grid, the economic loss brought to power supply enterprises by electric energy meter changing is not negligible, and it is urgently needed to develop related research for electric quantity metering method and metering device in meter changing process.
The method aims at the loss electric quantity which is not measured by the power consumption enterprise in the meter changing process, no special measuring instrument which can be popularized and used exists at home and abroad at the present stage, and the power supply enterprise generally adopts the loss electric quantity which can not be measured in the meter changing process of the large power consumption enterprise
The manual calculation method of (1) performs calculation charging, wherein P is three-phase power at a certain moment before table change,
the method is characterized in that the power factor before meter changing, t is meter changing time, and k is the multiplying power of a metering point, the method is greatly influenced by human factors, the accuracy is uncertain, and particularly under the condition that time-of-use electricity price charging is comprehensively carried out at present, the commonly adopted manual calculation method cannot accurately calculate the electricity charge actually used by a user, and the user who changes the meter is difficult to convince to carry out electric quantity and electricity charge backoff; therefore, in order to improve the quality of high-quality service and maintain the legal benefits of the three parties, research and development on an electric quantity calculation method and corresponding metering equipment in the meter changing process are urgently needed, so that accurate metering of the meter-free metering electric quantity is guaranteed.
Disclosure of Invention
The invention provides a portable electric quantity measuring instrument, and aims to solve the problem that the electric quantity actually used by a user cannot be measured in a time-sharing mode in the meter changing process in the prior art.
The technical solution of the invention is as follows: a portable electric quantity measuring instrument structurally comprises an alternating current sampling module S300, a CPU processing module S203, an integral calculation module, a timing module S210, a satellite time service module S209, a storage module S205, a battery management module S204 and a human-computer interaction module S206; the alternating current sampling module comprises an A/D conversion circuit module and a sampling time sequence control circuit module; the signal output end of the A/D conversion circuit module is connected with the first signal input end of the CPU processing module, the signal output end of the CPU processing module is connected with the signal input end of the sampling sequence control circuit module, the signal output end of the sampling sequence control circuit module is connected with the control signal input end of the A/D conversion circuit module, the signal output end of the timing module S210 is connected with the second signal input end of the CPU processing module S203, the signal output end of the satellite time service module S209 is connected with the third signal input end of the CPU processing module S203, the signal output end of the storage module S205 is connected with the fourth signal input end of the CPU processing module S203, the signal output end of the battery management module S204 is connected with the fifth signal input end of the CPU processing module S203, and the signal input and output end of the human-computer interaction module S206 is connected with the signal input and output end of the CPU; the CPU processing module S203 runs an integral calculation module.
The invention has the advantages that: the invention can measure the electric energy which is leaked in the replacement process of the electric energy meter in a short time.
Drawings
Fig. 1 is a schematic block diagram of a portable electricity meter according to the present invention.
Fig. 2 is a three-phase four-wire connection diagram of the portable electricity meter of the present invention in use in the field.
Fig. 3 is a schematic diagram of the overall effect of a portable electricity meter.
In the drawing, S212 is a sampling timing control circuit module, S203 is a CPU processing module, S210 is a timing module, S209 is a satellite timing module, S205 is a storage module, S204 is a battery management module, S206 is a human-computer interaction module, S207 is a display module, S208 is a key module, S201 is a voltage-current sampling circuit module, S202 is a signal amplification circuit module, S211 is an a/D conversion circuit module, S212 is a sampling timing control circuit module, S300 is an ac sampling module, S311 is an a-phase voltage input port, S312 is a B-phase voltage input port, S313 is a C-phase voltage input port, S314 is an a-phase current input port, S315 is a B-phase current input port, S316 is a C-phase current input port, S317 is an a-phase voltage dividing circuit, S318 is a B-phase voltage dividing circuit, S319 is a-phase current CT sampling circuit, S321 is a B-phase current CT sampling circuit, s322 is a C-phase current CT sampling circuit, S323 is an a-phase voltage signal amplifying circuit, S324 is a B-phase voltage signal amplifying circuit, S325 is a C-phase voltage signal amplifying circuit, S326 is an a-phase current signal amplifying circuit, S327 is a B-phase current signal amplifying circuit, S328 is a C-phase current signal amplifying circuit, S401 is a voltage clamp, S402 is a current clamp, S403 is a connecting pin, S404 is a three-phase four-wire electric energy meter, S405 is a joint junction box, S406 is a voltage input port of the portable electric energy meter, and S407 is a current input port of the portable electric energy meter.
Detailed Description
A portable electric quantity measuring instrument structurally comprises an alternating current sampling module S300, a CPU processing module S203, an integral calculation module, a timing module S210, a satellite time service module S209, a storage module S205, a battery management module S204 and a human-computer interaction module S206; the signal output end of the alternating current sampling module is connected with the first signal input end of the CPU processing module S203, the signal output end of the CPU processing module S203 is connected with the control signal input end of the alternating current sampling module, the signal output end of the timing module S210 is connected with the second signal input end of the CPU processing module S203, the signal output end of the satellite time service module S209 is connected with the third signal input end of the CPU processing module S203, the signal output end of the storage module S205 is connected with the fourth signal input end of the CPU processing module S203, the signal output end of the battery management module S204 is connected with the fifth signal input end of the CPU processing module S203, and the signal input and output end of the human-computer interaction module S206 is connected with the signal input and output end of the CPU processing module S203; the CPU processing module S203 runs an integral calculation module.
The portable electric quantity measuring instrument structurally further comprises a display module S207, a key module S208; the signal input end of the display module S207 is connected with the signal output end of the human-computer interaction module S206, and the signal output end of the key module S208 is connected with the signal input end of the human-computer interaction module S206; the key module is used for processing key input.
The alternating current sampling module S300 comprises a voltage and current sampling circuit module S201, a signal amplifying circuit module S202, an A/D conversion circuit module S211 and a sampling time sequence control circuit module S212; the voltage-current sampling circuit module S201 includes a voltage input port S406, a current input port S407, an a-phase voltage dividing circuit S317, a B-phase voltage dividing circuit S318, a C-phase voltage dividing circuit S319, an a-phase current CT sampling circuit S320, a B-phase current CT sampling circuit S321, and a C-phase current CT sampling circuit S322; the voltage input port S406 includes an a-phase voltage input port S311, a B-phase voltage input port S312, and a C-phase voltage input port S313, the current input port S407 includes an a-phase current input port S314, a B-phase current input port S315, and a C-phase current input port S316, and the signal amplification circuit module S202 includes an a-phase voltage signal amplification circuit S323, a B-phase voltage signal amplification circuit S324, a C-phase voltage signal amplification circuit S325, an a-phase current signal amplification circuit S326, a B-phase current signal amplification circuit S327, and a C-phase current signal amplification circuit S328; the signal output end of the A/D conversion circuit module S211 is connected with the first signal input end of the CPU processing module S203, the signal output end of the CPU processing module S203 is connected with the signal input end of the sampling sequence control circuit module S212, the signal output end of the sampling sequence control circuit module S212 is connected with the control signal input end of the A/D conversion circuit module S211, the A phase voltage input port, the A phase voltage divider circuit, the A phase voltage signal amplifier circuit and the first signal input port of the A/D conversion circuit module S211 are sequentially connected, the B phase voltage input port, the B phase voltage divider circuit, the B phase voltage signal amplifier circuit and the second signal input port of the A/D conversion circuit module S211 are sequentially connected, the C phase voltage input port, the C phase voltage divider circuit, the C phase voltage signal amplifier circuit and the third signal input port of the A/D conversion circuit module S211 are sequentially connected, the phase-A current input port, the phase-A current CT sampling circuit, the phase-A current signal amplifying circuit and the fourth signal input port of the A/D conversion circuit module S211 are sequentially connected, the phase-B current input port, the phase-B current CT sampling circuit, the phase-B current signal amplifying circuit and the fifth signal input port of the A/D conversion circuit module S211 are sequentially connected, and the phase-C current input port, the phase-C current CT sampling circuit, the phase-C current signal amplifying circuit and the sixth signal input port of the A/D conversion circuit module S211 are sequentially connected.
The alternating current sampling module S300 further includes a plurality of voltage clamps S401 and a plurality of current clamps S402, preferably 4 voltage clamps and 3 current clamps; the phase voltage input port A, the phase voltage input port B, the phase voltage input port C, the phase current input port A, the phase current input port B and the phase current input port C are respectively connected with corresponding voltage clamps or current clamps, and preferably, the phase voltage input port A, the phase voltage input port B, the phase current input port C, the phase current input port A, the phase current input port B and the phase current input port C are respectively connected with corresponding voltage clamps or current clamps through connecting pins; when the portable electricity meter works, a current clamp and a voltage clamp on the portable electricity meter respectively sample voltage signals and circuit signals of a test site through a combined junction box S405 and output the voltage signals and the circuit signals to a signal amplification circuit module S202, the signal amplification circuit module S202 performs signal amplification and denoising on the input voltage signals and current signals and then outputs the processed voltage signals and current signals to an A/D conversion circuit module S211, the A/D conversion circuit module S211 samples the input voltage signals and current signals to obtain sampling values, a sampling time sequence control module S212 outputs synchronous sampling signals to control the A/D conversion circuit module S211 to perform synchronous sampling, a CPU processing module S203 reads the sampling values obtained by the A/D conversion circuit module S211 and operates an integral calculation module to calculate to obtain phase voltages, phase voltages and current signals of each phase, And (4) further calculating a three-phase power factor angle and three-phase instantaneous power in the current phase, and then performing integral calculation on each phase of power to obtain electric quantity.
The voltage and current sampling circuit module S201 is connected with voltage input through a voltage interface, and then performs voltage signal sampling through a resistance voltage division circuit; the voltage and current sampling circuit module S201 is connected with current signal input through a current input interface, and then carries out current signal sampling through a CT sampling circuit; the voltage and current sampling circuit module S201 outputs the sampled voltage signal and current signal to the signal amplifying circuit module.
The signal amplifying circuit module S202 amplifies and denoises the input voltage signal and current signal, and then outputs the signals to the a/D conversion circuit module S211.
The a/D conversion circuit module S211 is responsible for continuously sampling the input voltage signal and current signal.
The sampling timing control circuit module S212 outputs a synchronous sampling control signal to the a/D conversion circuit module S211, and controls the synchronous sampling.
The CPU processing module S203 reads the continuous voltage and current sampling values of the a/D conversion circuit module S211, and outputs the continuous voltage and current sampling values to the integral calculation module for calculation.
The integral calculation module analyzes and calculates the acquired voltage and current, further calculates three-phase power factors and three-phase instantaneous power according to the voltage and current phases, and further performs integral calculation on each phase of power to obtain an electric energy value.
The timing module S210 is configured to record time used for replacing the electric energy meter, and record dates and times corresponding to the beginning and the end of meter replacement.
The satellite time service module S209 is used for carrying out timing satellite time service on the testing device; the satellite time service module can acquire satellite time in real time and time-service and time-correcting the portable electric quantity measuring instrument at regular time.
The storage module S205 is used to store all test records and data when the power is off.
The battery management module S204 includes a rechargeable battery and a charging management circuit module.
The timing module can measure calendar time, switch rate time intervals and count the total running time of each time interval.
A method of metering missed charges using a portable electricity meter, the method comprising the steps of:
s11, setting the frequency of voltage and current input signals (Ua, Ub, Uc, Ia, Ib and Ic) as f, setting the period T as 1/f, outputting synchronous sampling signals by the sampling time sequence control circuit module to control the A/D conversion circuit module to continuously sample the input voltage signals and current signals, and collecting 1024 points per cycle; the sampling time sequence control module outputs synchronous sampling signal frequency fs (1024 f), and the acquisition interval T1 (1/fs);
s12, the A/D conversion circuit module S211 carries out continuous discrete sampling on the input voltage signal and the input current signal to obtain a sampling value sequence Ua [0:1023], Ub [0:1023], Uc [0:1023], Ia [0:1023], Ib [0:1023] and Ic [0:1023] of each cycle of the phase voltage and the current; wherein [0:1023] refers to the serial number of each sampling value in each phase voltage and current cycle;
s13 sample value sequence Ua [0:1023] obtained for each phase voltage and current]、Ub[0:1023]、Uc[0:1023]、Ia[0:1023]、Ib[0:1023]、Ic[0:1023]Respectively obtaining effective values Ua of each phase voltage and current by taking root mean square value2、Ub2、Uc2、Ia2、Ib2、Ic2；
S14, the method for calculating the active power of each phase comprises the following steps:
wherein N is the number of sampling points in each cycle, and takes values of 0 to 1023, and NS＝1024；
S15, further active power of each phase:
active power Pa of phase A ═
Ua[0]*Ia[0]+Ua[1]*Ia[1]+...+Ua[1023]*Ia[1023]；
Active power of B phase Pb ═
Ub[0]*Ib[0]+Ub[1]*Ib[1]+...+Ub[1023]*Ib[1023]；
C-phase active power Pc ═
Uc[0]*Ic[0]+Uc[1]*Ic[1]+...+Uc[1023]*Ic[1023]；
Total active power Ps＝Pa+Pb+Pc；
S16, the calculation method for sampling each phase of reactive power and shifting the phase by 90 degrees comprises the following steps:
wherein n is the serial number of the sampling point and takes the value from 0 to Ns-1; n is90The serial number of the sampling point is 90 degrees after phase shift;
and S17, further calculating the reactive power of each phase:
phase A reactive power Qa ═
Ua[0]*Ia[256]+Ua[1]*Ia[257]+...+Ua[1023]*Ia[255]；
B-phase reactive power Qb ═
Ub[0]*Ib[256]+Ub[1]*Ib[257]+...+Ub[1023]*Ib[255]；
C-phase reactive power Qc ═
Uc[0]*Ic[256]+Uc[1]*Ic[257]+...+Uc[1023]*Ic[255]；
Total reactive power Qs＝Qa+Qb+Qc；
S18, an electric energy calculation formula, wherein E is P x t, wherein P is power, and t is time;
active electric energy per period PsT, wherein PsIs the average active power over a period of time;
every period of reactive power QsT, wherein QsAverage nonfunctional power over a period of time;
s19, an active electric energy accumulator E is arranged in the integral calculation moduleZYOnce per cycle time T, EZY＝Ps1*T1+Ps2*T2+Ps3*T3+...+PsN*TN；
S20 reactive power accumulator E is arranged in the integral calculation moduleZWOnce per cycle time T, EZW＝Qs1*T1+1s2*T2+Qs3*T3+...+QsN*TN；
S21, setting 24 hours a day as tip, peak, flat and valley 4 rate periods, and setting the charging price of each rate period as JTip of a needle,JPeak(s),JFlat plate,JGrain；
S22, the satellite time service module periodically acquires high-precision satellite time and outputs the satellite time to the CPU processing module, the CPU processing module outputs the satellite time to the timing module for metering,
the timing module is used for timing according to the input satellite time;
s23, when the timing module measures the time and enters a certain time period, the active electric energy accumulator E is recordedZYAnd reactive electric energy accumulator EZWRespectively as active electric energy value EZY1And a non-functional electric energy value EZW1；
S24, when the time measured by the timing module exceeds a certain time period, the active electric energy accumulator E is recordedZYAnd reactive electric energy accumulator EZWRespectively as active electric energy value EZY2And a non-functional electric energy value EZW2；
S25, the active electric energy E1 ═ E in the periodZY2-EZY1；
S26, the reactive power E2 is E in the periodZW2-EZW1；
S27, charging the active electric energy in the time interval, wherein E1 is the functional electric energy in the time interval, and J is the electric energy price corresponding to the time interval;
and S28, adding the active electric energy charging in each period to obtain the total active electric energy charging.
The method is suitable for calculating the short-time leakage electricity quantity based on time sharing.
Claims (10)
1. A portable electric quantity measuring instrument is characterized by comprising an alternating current sampling module, a CPU processing module, an integral calculating module, a timing module, a satellite time service module, a storage module, a battery management module and a man-machine interaction module; the alternating current sampling module comprises an A/D conversion circuit module and a sampling time sequence control circuit module; the signal output end of the A/D conversion circuit module is connected with the first signal input end of the CPU processing module, the signal output end of the CPU processing module is connected with the signal input end of the sampling time sequence control circuit module, the signal output end of the sampling time sequence control circuit module is connected with the control signal input end of the A/D conversion circuit module, the signal output end of the timing module is connected with the second signal input end of the CPU processing module, the signal output end of the satellite time service module is connected with the third signal input end of the CPU processing module, the signal output end of the storage module is connected with the fourth signal input end of the CPU processing module, the signal output end of the battery management module is connected with the fifth signal input end of the CPU processing module, and the signal input output end of the human-computer interaction module is connected with the signal input output end of; and the CPU processing module runs an integral calculation module.
2. A portable electricity meter according to claim 1 further comprising a display module, a key module; the signal input end of the display module is connected with the signal output end of the man-machine interaction module, and the signal output end of the key module is connected with the signal input end of the man-machine interaction module; the key module is used for processing key input.
3. The portable electricity meter according to claim 1, wherein said ac sampling module further comprises a voltage current sampling circuit module, a signal amplifying circuit module; the voltage and current sampling circuit module comprises a voltage input port, a current input port, an A-phase voltage divider circuit, a B-phase voltage divider circuit, a C-phase voltage divider circuit, an A-phase current CT sampling circuit, a B-phase current CT sampling circuit and a C-phase current CT sampling circuit; the voltage input port comprises an A-phase voltage input port, a B-phase voltage input port and a C-phase voltage input port, the current input port comprises an A-phase current input port, a B-phase current input port and a C-phase current input port, and the signal amplification circuit module comprises an A-phase voltage signal amplification circuit, a B-phase voltage signal amplification circuit, a C-phase voltage signal amplification circuit, an A-phase current signal amplification circuit, a B-phase current signal amplification circuit and a C-phase current signal amplification circuit; the phase-A voltage input port, the phase-A voltage dividing circuit, the phase-A voltage signal amplifying circuit and the first signal input port of the A/D conversion circuit module are sequentially connected, the phase-B voltage input port, the phase-B voltage dividing circuit, the phase-B voltage signal amplifying circuit and the second signal input port of the A/D conversion circuit module are sequentially connected, the phase-C voltage input port, the phase-C voltage dividing circuit, the phase-C voltage signal amplifying circuit and the third signal input port of the A/D conversion circuit module are sequentially connected, the phase-A current input port, the phase-A current CT sampling circuit, the phase-A current signal amplifying circuit and the fourth signal input port of the A/D conversion circuit module are sequentially connected, and the phase-B current input port, the phase-B current CT sampling circuit, the phase-B current signal amplifying circuit, and the fifth signal input port of the A/D conversion circuit module is sequentially connected, and the C-phase current input port, the C-phase current CT sampling circuit, the C-phase current signal amplifying circuit and the sixth signal input port of the A/D conversion circuit module are sequentially connected.
4. A portable electricity meter according to claim 3, wherein said ac sampling module further comprises a plurality of voltage clamps, a plurality of current clamps; the A-phase voltage input port, the B-phase voltage input port, the C-phase voltage input port, the A-phase current input port, the B-phase current input port and the C-phase current input port are respectively connected with corresponding voltage clamps or current clamps.
5. The portable electricity meter according to claim 1, wherein said a/D conversion circuit module is responsible for continuously sampling the input voltage signal and current signal; the sampling time sequence control circuit module outputs a synchronous sampling control signal to the A/D conversion circuit module to control the A/D conversion circuit module to perform synchronous sampling; the CPU processing module reads the continuous sampling values of the voltage and the current of the A/D conversion circuit module and outputs the continuous sampling values to the integral calculation module.
6. The portable electricity meter according to claim 3, wherein said signal amplifying circuit module amplifies and denoises the input voltage signal and current signal, and outputs the amplified and denoised signals to said a/D conversion circuit module.
7. The portable electricity meter according to claim 1, wherein said timing module is capable of measuring calendar time and performing rate period switching, and is capable of timing total operation time of each period.
8. The portable electric quantity meter according to claim 1, wherein said satellite time service module is capable of acquiring satellite time in real time and timing the portable electric quantity meter.
9. A portable electricity meter according to claim 1, wherein said storage module is adapted to store all test records and data during a power outage; the battery management module comprises a rechargeable battery and a charging management circuit module.
10. A method of measuring a missing charge using the portable electricity meter according to any one of claims 1 to 9, the method comprising the steps of:
s11, setting the frequency of voltage and current input signals as f, and the period T as 1/f, outputting synchronous sampling signals by the sampling time sequence control circuit module to control the A/D conversion circuit module to continuously sample the input voltage signals and current signals, and collecting 1024 points per cycle; the sampling time sequence control module outputs synchronous sampling signal frequency fs (1024 f), and the acquisition interval T1 (1/fs);
s12, the A/D conversion circuit module S211 carries out continuous discrete sampling on the input voltage signal and the input current signal to obtain a sampling value sequence Ua [0:1023], Ub [0:1023], Uc [0:1023], Ia [0:1023], Ib [0:1023] and Ic [0:1023] of each cycle of the phase voltage and the current; wherein [0:1023] refers to the serial number of each sampling value in each phase voltage and current cycle;
s13 sample value sequence Ua [0:1023] obtained for each phase voltage and current]、Ub[0:1023]、Uc[0:1023]、Ia[0:1023]、Ib[0:1023]、Ic[0:1023]Respectively obtaining effective values Ua of each phase voltage and current by taking root mean square value2、Ub2、Uc2、Ia2、Ib2、Ic2；
S14, the method for calculating the active power of each phase comprises the following steps:
wherein N is the number of sampling points in each cycle, and takes values of 0 to 1023, and NS＝1024；
S15, further active power of each phase:
active power Pa of phase A ═
Ua[0]*Ia[0]+Ua[1]*Ia[1]+...+Ua[1023]*Ia[1023]；
Active power of B phase Pb ═
Ub[0]*Ib[0]+Ub[1]*Ib[1]+...+Ub[1023]*Ib[1023]；
C-phase active power Pc ═
Uc[0]*Ic[0]+Uc[1]*Ic[1]+...+Uc[1023]*Ic[1023]；
Total active power Ps＝Pa+Pb+Pc；
S16, the calculation method for sampling each phase of reactive power and shifting the phase by 90 degrees comprises the following steps:
wherein n is the serial number of the sampling point and takes the value from 0 to Ns-1; n is90The serial number of the sampling point is 90 degrees after phase shift;
and S17, further calculating the reactive power of each phase:
phase A reactive power Qa ═
Ua[0]*Ia[256]+Ua[1]*Ia[257]+...+Ua[1023]*Ia[255]；
B-phase reactive power Qb ═
Ub[0]*Ib[256]+Ub[1]*Ib[257]+...+Ub[1023]*Ib[255]；
C-phase reactive power Qc ═
Uc[0]*Ic[256]+Uc[1]*Ic[257]+...+Uc[1023]*Ic[255]；
Total reactive power Qs＝Qa+Qb+Qc；
S18, an electric energy calculation formula, wherein E is P x t, wherein P is power, and t is time;
active electric energy per period PsT, wherein PsIs the average active power over a period of time;
every period of reactive power QsT, wherein QsAverage nonfunctional power over a period of time;
s19, an active electric energy accumulator E is arranged in the integral calculation moduleZYThe time T of each period is accumulated once,
EZY＝Ps1*T1+Ps2*T2+Ps3*T3+...+PsN*TN；
s20 reactive power accumulator E is arranged in the integral calculation moduleZWThe time T of each period is accumulated once,
EZW＝Qs1*T1+1s2*T2+Qs3*T3+...+QsN*TN；
s21, setting 24 hours a day as tip, peak, flat and valley 4 rate periods, and setting the charging price of each rate period as JTip of a needle,JPeak(s),JFlat plate,JGrain；
S22, the satellite time service module periodically acquires high-precision satellite time and outputs the satellite time to the CPU processing module, the CPU processing module outputs the satellite time to the timing module for metering,
the timing module is used for timing according to the input satellite time;
s23, when the timing module measures the time and enters a certain time period, the active electric energy accumulator E is recordedZYAnd reactive electric energy accumulator EZWRespectively as active electric energy value EZY1And a non-functional electric energy value EZW1；
S24, when the time measured by the timing module exceeds a certain time period, the active electric energy accumulator E is recordedZYAnd reactive electric energy accumulator EZWRespectively as active electric energy value EZY2And a non-functional electric energy value EZW2；
S25, the active electric energy E1 ═ E in the periodZY2-EZY1；
S26, the reactive power E2 is E in the periodZW2-EZW1；
S27, charging the active electric energy in the time interval, wherein E1 is the functional electric energy in the time interval, and J is the electric energy price corresponding to the time interval;
and S28, adding the active electric energy charging in each period to obtain the total active electric energy charging.
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