CN110736869A - single-phase circuit current separation method, device and equipment - Google Patents

single-phase circuit current separation method, device and equipment Download PDF

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CN110736869A
CN110736869A CN201911111466.8A CN201911111466A CN110736869A CN 110736869 A CN110736869 A CN 110736869A CN 201911111466 A CN201911111466 A CN 201911111466A CN 110736869 A CN110736869 A CN 110736869A
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current
phase
power grid
circuit
voltage
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CN110736869B (en
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李�杰
余亚东
田野
王帅
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Pingdingshan University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/146—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/06—Measuring real component; Measuring reactive component

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Abstract

The invention discloses a current separation method, a device and equipment of single-phase circuits, which are characterized in that current and voltage components respectively orthogonal to the current and the voltage of a single-phase power grid are constructed, and active and reactive power instantaneous values of the single-phase circuits are calculated, according to the principle that the active and reactive currents are respectively determined by the active power steady-state components and the reactive power steady-state components, principles are adopted, the active and reactive currents of load current are calculated on the basis of calculating the active power steady-state components, and harmonic current in the current of the power grid is calculated on the basis of calculating the sum of the active power fluctuation components and the reactive power fluctuation components.

Description

single-phase circuit current separation method, device and equipment
Technical Field
The invention relates to a power system, in particular to a current separation method, a device and equipment of single-phase circuits.
Background
With the heavy use of more and more single-phase power electronic devicesFor example, in the electric railway, the application of which adopts single-phase rectification power supply locomotive and switching power supply, and the application of various household appliances such as microwave oven, television and air conditioner, etc. can increase the harmonic content of electric network, and how to quickly and accurately separate the active, reactive and harmonic currents from electric network current becomes the problem which needs to be solved urgently, patent 201510012017.3 proposes active and reactive current separation method, but this method is only suitable for low-harmonic environment, and its application range is limited, and at present, i used widely by isp-iqThe invention provides simple separation methods without a large amount of calculation to realize the separation of active, reactive and harmonic currents in single-phase current, which is a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
The invention aims to provide current separation methods, devices and equipment for a single-phase circuit, which are used for quickly and effectively realizing the separation of active, reactive and harmonic currents.
In order to solve the above technical problem, the present invention provides current separation methods for single-phase circuits, including:
step 1: obtaining the current i of the single-phase power grid through a hysteresis link respectivelyLαCurrent signal i lagging by pi/2 periodLβAnd the single-phase network voltage vSαVoltage signal v lagging by pi/2 periodSβ；
Step 2: by usingCalculating instantaneous active power p (ω t) of the single-phase circuit, wherein p (ω t) is composed of steady-state components
Figure BDA0002271611100000012
And a fluctuating component
Figure BDA0002271611100000013
Composition and utilization ofCalculating instantaneous reactive power q (ω t) of the single-phase circuit, wherein the q (ω t) is composed of steady-state components
Figure BDA0002271611100000015
And a fluctuating component
Figure BDA0002271611100000016
Composition is carried out;
and step 3: respectively passing the calculated p (ω t) through a low-pass filter and a high-pass filter to obtain the steady-state component of p (ω t)
Figure BDA0002271611100000017
And a fluctuating component
Figure BDA0002271611100000018
And 4, step 4: respectively passing the calculated q (ω t) through a low-pass filter and a high-pass filter to obtain the steady-state component of q (ω t)
Figure BDA0002271611100000021
And a fluctuating component
And 5: by using
Figure BDA0002271611100000023
And
Figure BDA0002271611100000024
respectively calculating to obtain active current i in the circuitp(ω t) and th harmonic component ihα(ωt)；
Step 6: by usingAndrespectively calculating to obtain reactive current i in the circuitq(ω t) and (d)Second harmonic component ihβ(ωt)；
Step 7, the harmonic current is obtained by summing th harmonic component and the second harmonic component according to the following formula
Figure BDA0002271611100000027
In order to solve the above technical problem, the present invention further provides current splitting devices suitable for single-phase circuits, including:
a collecting unit: for obtaining the single-phase grid current and the single-phase grid voltage;
a delay unit: the delay circuit is used for delaying the single-phase power grid current and the single-phase power grid voltage to obtain a current signal lagging the single-phase power grid current by pi/2 period and a voltage signal lagging the single-phase power grid voltage by pi/2 period;
a calculation unit: and calculating by using the single-phase power grid current, the single-phase power grid voltage, the current signal lagging the single-phase power grid current by pi/2 period and the voltage signal lagging the single-phase power grid voltage by pi/2 period, which are acquired by the acquisition unit, to obtain the active current, the reactive current and the harmonic current of the single-phase circuit.
In order to solve the above technical problem, the present invention further provides current splitting apparatuses suitable for single-phase circuits, including:
a memory: for storing instructions comprising the steps of the current splitting method for a single phase circuit;
a processor: for executing the instructions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic diagram of the active, reactive and harmonic current splitting method.
Fig. 2 is a waveform of the active, reactive and harmonic currents separated by the present separation method.
Detailed Description
The core of the invention is to provide current separation methods, devices and equipment for single-phase circuits, and the invention will be described in detail with reference to fig. 1 in .
Step 1: respectively collecting load current i by current and voltage sampling circuitsLαAnd the network voltage vSα；
Step 2: according to the set sampling frequency of the ADC module, the data I and the data I are respectively obtained by adopting a first-in first-out mode and combining the transfer characteristics of data among arraysLα、vSαI with lag of pi/2Lβ、vsβ. The specific implementation process is as follows:
suppose that the current and voltage sampling values at the k-th time are iLα(k)、vSα(k)，
iLα＝iLα(k)，iLβ＝iLα(k-50)；
vSα＝vSα(k)，vSβ＝vSα(k-50)；
And step 3: calculating the k-th instantaneous active power p (k) by the following formula, wherein p (k) is a steady component
Figure BDA0002271611100000031
And a fluctuating component
Figure BDA0002271611100000032
Composition is carried out;
Figure BDA0002271611100000033
and 4, step 4: p (k) is obtained by a digital Low Pass Filter (LPF)
Figure BDA0002271611100000034
The specific process is as follows:
(
Figure BDA0002271611100000036
is the steady-state component of p (k) at the k-1 st time
And 5: passing p (k) through a digital High Pass Filter (HPF)
Step 6: calculating the k-th instantaneous reactive power q (k) by the following formula, wherein q (k) is a steady component
Figure BDA0002271611100000038
And a fluctuating component
Figure BDA0002271611100000039
Composition is carried out;
Figure BDA00022716111000000310
and 7: similar to steps 4 and 5, q (k) is obtained by passing q (k) through a digital Low Pass Filter (LPF) and a High Pass Filter (HPF)
Figure BDA00022716111000000311
And
Figure BDA00022716111000000312
and 8: by using
Figure BDA0002271611100000041
Obtaining active current in a circuit, utilizing
Figure BDA0002271611100000042
Obtaining reactive current in the circuit;
and step 9: by using
Figure BDA0002271611100000043
Obtaining harmonic current in the single-phase circuit.
It should be noted that, for those skilled in the art, the current splitting method, the current splitting device and the current splitting apparatus for single-phase circuits provided in the present invention can be modified without departing from the principle of the present invention, and the modifications and modifications also fall into the protection scope of the appended claims.

Claims (3)

  1. The current separation method of the single-phase circuits is characterized by comprising the following steps of:
    step 1: obtaining the current i of the single-phase power grid through a hysteresis link respectivelyLαCurrent signal i lagging by pi/2 periodLβAnd the single-phase network voltage vSαVoltage signal v lagging by pi/2 periodsβ；
    Step 2: by using
    Figure FDA0002271611090000011
    Calculating instantaneous active power p (ω t) of the single-phase circuit, wherein p (ω t) is composed of steady-state componentsAnd a fluctuating componentComposition and utilization ofCalculating instantaneous reactive power q (ω t) of the single-phase circuit, wherein the q (ω t) is composed of steady-state componentsAnd a fluctuating component
    Figure FDA0002271611090000016
    Composition is carried out;
    and step 3: will be provided withThe calculated p (ω t) is respectively passed through a low-pass filter and a high-pass filter, so that the steady-state component of p (ω t) can be obtained
    Figure FDA0002271611090000017
    And a fluctuating component
    Figure FDA0002271611090000018
    And 4, step 4: respectively passing the calculated q (ω t) through a low-pass filter and a high-pass filter to obtain the steady-state component of q (ω t)And a fluctuating component
    Figure FDA00022716110900000110
    And 5: by using
    Figure FDA00022716110900000111
    And
    Figure FDA00022716110900000112
    respectively calculating to obtain active current i in the circuitp(ω t) and th harmonic component ihα(ωt)；
    Step 6: by using
    Figure FDA00022716110900000113
    And
    Figure FDA00022716110900000114
    respectively calculating to obtain reactive current i in the circuitq(ω t) and a second harmonic component ihβ(ωt)；
    Step 7, the harmonic current is obtained by summing th harmonic component and the second harmonic component according to the following formula
  2. A current splitting apparatus of the type adapted for use in a single phase electrical circuit, comprising:
    a collecting unit: for obtaining the single-phase grid current and the single-phase grid voltage;
    a delay unit: the delay circuit is used for delaying the single-phase power grid current and the single-phase power grid voltage to obtain a current signal lagging the single-phase power grid current by pi/2 period and a voltage signal lagging the single-phase power grid voltage by pi/2 period;
    a calculation unit: and calculating by using the single-phase power grid current, the single-phase power grid voltage, the current signal lagging the single-phase power grid current by pi/2 period and the voltage signal lagging the single-phase power grid voltage by pi/2 period, which are acquired by the acquisition unit, to obtain the active current, the reactive current and the harmonic current of the single-phase circuit.
  3. A current splitting apparatus of the type adapted for use in a single phase circuit, comprising:
    a memory: -storing instructions comprising the steps of the current splitting method for single phase circuits of claim 1;
    a processor: for executing the instructions.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111624392A (en) * 2020-07-20 2020-09-04 平顶山学院 Method, device and equipment for detecting fundamental wave current of single-phase circuit

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6075350A (en) * 1998-04-24 2000-06-13 Lockheed Martin Energy Research Corporation Power line conditioner using cascade multilevel inverters for voltage regulation, reactive power correction, and harmonic filtering
CN101924371A (en) * 2010-09-08 2010-12-22 株洲变流技术国家工程研究中心有限公司 Mixed power quality treatment method
CN102062803A (en) * 2009-11-17 2011-05-18 湖北省电力试验研究院 Active current extraction method based on orthogonal sine wave integral modulation
CN104535826A (en) * 2015-01-05 2015-04-22 广东工业大学 Active and reactive current separation method suitable for single phase low-harmonic-wave environment
CN106610450A (en) * 2015-10-23 2017-05-03 上海贝岭股份有限公司 Single-phase electric energy metering chip
CN108493966A (en) * 2018-04-24 2018-09-04 东北大学 A kind of micro-capacitance sensor uncompensated load control method and device based on virtual synchronous technology
CN110445153A (en) * 2019-08-07 2019-11-12 国网山西省电力公司电力科学研究院 A kind of two-way AC/DC converter for realizing power quality controlling

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6075350A (en) * 1998-04-24 2000-06-13 Lockheed Martin Energy Research Corporation Power line conditioner using cascade multilevel inverters for voltage regulation, reactive power correction, and harmonic filtering
CN102062803A (en) * 2009-11-17 2011-05-18 湖北省电力试验研究院 Active current extraction method based on orthogonal sine wave integral modulation
CN101924371A (en) * 2010-09-08 2010-12-22 株洲变流技术国家工程研究中心有限公司 Mixed power quality treatment method
CN104535826A (en) * 2015-01-05 2015-04-22 广东工业大学 Active and reactive current separation method suitable for single phase low-harmonic-wave environment
CN106610450A (en) * 2015-10-23 2017-05-03 上海贝岭股份有限公司 Single-phase electric energy metering chip
CN108493966A (en) * 2018-04-24 2018-09-04 东北大学 A kind of micro-capacitance sensor uncompensated load control method and device based on virtual synchronous technology
CN110445153A (en) * 2019-08-07 2019-11-12 国网山西省电力公司电力科学研究院 A kind of two-way AC/DC converter for realizing power quality controlling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WANG JIANMIN ET AL.: "Several Methods to Improve the Accuracy of Adaptive Harmonic Current Detection for Single-Phase Circuits", 《THE 11TH IEEE INTERNATIONAL CONFERENCE ON ELECTRONIC MEASUREMENT & INSTRUMENTS》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111624392A (en) * 2020-07-20 2020-09-04 平顶山学院 Method, device and equipment for detecting fundamental wave current of single-phase circuit
CN111624392B (en) * 2020-07-20 2022-11-22 平顶山学院 Method, device and equipment for detecting fundamental wave current of single-phase circuit

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