CN108054763B - Method and system for determining comprehensive management of power quality - Google Patents

Method and system for determining comprehensive management of power quality Download PDF

Info

Publication number
CN108054763B
CN108054763B CN201810014505.1A CN201810014505A CN108054763B CN 108054763 B CN108054763 B CN 108054763B CN 201810014505 A CN201810014505 A CN 201810014505A CN 108054763 B CN108054763 B CN 108054763B
Authority
CN
China
Prior art keywords
phase
current
fundamental wave
active current
active
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810014505.1A
Other languages
Chinese (zh)
Other versions
CN108054763A (en
Inventor
黄海宏
姜泽旭
王海欣
马凡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ANHUI CAS-HIAU ELECTRICAL Inc.
Original Assignee
Hefei Polytechnic University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hefei Polytechnic University filed Critical Hefei Polytechnic University
Priority to CN201810014505.1A priority Critical patent/CN108054763B/en
Publication of CN108054763A publication Critical patent/CN108054763A/en
Application granted granted Critical
Publication of CN108054763B publication Critical patent/CN108054763B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention discloses a method and a system for determining electric energy quality comprehensive management, which comprise the following steps: obtaining three-phase current and three-phase voltage sinusoidal signals; obtaining the active current amplitude of each phase fundamental wave corresponding to each phase current; multiplying the active current amplitude of each phase fundamental wave by the three-phase voltage sinusoidal signal to obtain the active current of each phase fundamental wave; obtaining reactive power and harmonic current of each phase; calculating the average value of the active current amplitude of each phase of fundamental wave; subtracting the average value of the active current amplitude of each phase fundamental wave from the active current amplitude of each phase fundamental wave to obtain the active current amplitude difference of each phase fundamental wave to obtain the fundamental active current to be regulated; obtaining voltage loop output through a proportional integral regulator according to the difference between the given direct current side voltage and the actual voltage; adding the fundamental wave active current to be regulated, the reactive and harmonic currents of each phase and the command current output by the voltage loop to obtain the actual command current to perform the balancing operation of each phase current. The method provided by the invention can be used for inhibiting reactive power and harmonic waves in each phase of current and realizing the balance of three-phase current.

Description

Method and system for determining comprehensive management of power quality
Technical Field
The invention relates to the field of three-phase current balance, in particular to a method and a system for determining electric energy quality comprehensive management of compensating reactive power and harmonic current and balancing three-phase current in a three-phase four-wire system power grid.
Background
The low-voltage distribution network in China generally adopts a three-phase four-wire power supply mode, and has the characteristics of small and dispersed load, high single-phase load occupation ratio, large influence of seasons and air temperature on the load, large load fluctuation range and the like, and the single-phase load mostly adopts diode uncontrolled rectification and no power factor correction circuit, so that three-phase imbalance and harmonic ratio are serious, network side current contains multiple harmonics, harmonic voltage drop is caused, the loss of a distribution network transformer is increased, the output is reduced, the voltage is asymmetric, zero-sequence current is increased, the efficiency of a motor is reduced, and the loss of a line is increased.
Disclosure of Invention
The invention aims to provide a determination method and a determination system for comprehensive management of electric energy quality, which solve the problems that reactive power and harmonic waves in each phase of current cannot be inhibited, and the balance of three-phase current cannot be realized.
In order to achieve the purpose, the invention provides the following scheme:
a method for determining comprehensive management of power quality comprises the following steps:
respectively measuring three-phase circuits of a power supply end to obtain three-phase currents;
performing phase locking on the three-phase circuit to obtain a three-phase voltage sinusoidal signal with the same frequency and the same phase as the voltage of the three-phase circuit;
obtaining the active current amplitude of each phase of fundamental wave corresponding to each phase of current according to the three-phase current and the three-phase voltage sinusoidal signal;
multiplying the active current amplitude of each phase of fundamental wave by the three-phase voltage sinusoidal signal to obtain the active current of each phase of fundamental wave;
obtaining each phase of reactive power and harmonic current according to the three-phase current and the fundamental wave active current of each phase;
calculating the average value of the active current amplitude of each phase fundamental wave according to the active current amplitude of each phase fundamental wave;
subtracting the average value of the active current amplitude of each phase fundamental wave from the average value of the active current amplitude of each phase fundamental wave to obtain the active current amplitude difference of each phase fundamental wave;
multiplying the amplitude difference of the active current of each phase of fundamental wave with the three-phase voltage sinusoidal signal to obtain the active current of the fundamental wave to be regulated;
obtaining voltage loop output through a proportional integral regulator according to the difference between the given direct current side voltage and the actual voltage;
adding the fundamental wave active current to be regulated, the reactive and harmonic currents of each phase and the command current output by the voltage loop to obtain an actual command current, and performing the balancing operation of each phase current according to the actual command current.
Optionally, the obtaining of the active current amplitude of each phase fundamental wave corresponding to each phase current according to the three-phase current and the three-phase voltage sinusoidal signal specifically includes:
the result obtained by multiplying the three-phase current by the three-phase voltage sinusoidal signal respectively contains a direct current component and an alternating current component;
and obtaining the active current amplitude of each phase of fundamental wave according to the direct current component in the result.
Optionally, the obtaining of each phase of reactive power and harmonic current according to the three-phase current and the each phase of fundamental wave active current specifically includes:
and subtracting the active current of each phase fundamental wave from the three-phase current to obtain the reactive current and the harmonic current of each phase.
Optionally, the obtaining the active current amplitude of the fundamental wave of each phase according to the dc component of the current of each phase specifically includes:
according to formula Ip＝kI1Wherein, IpThe active current amplitude of each phase fundamental wave is taken as the active current amplitude of each phase fundamental wave; i is1K is a natural number greater than 0 as a direct-current component of the current of each phase. Optionally, k is 2.
A system for determining integrated management of power quality, comprising:
the current acquisition module is used for respectively measuring the three-phase circuits of the power supply end to obtain three-phase currents;
the voltage sinusoidal signal determination module is used for performing phase locking on the three-phase circuit to obtain a three-phase voltage sinusoidal signal with the same frequency and the same phase as the three-phase circuit voltage;
the active current amplitude calculation module is used for obtaining the active current amplitude of each phase of fundamental wave corresponding to each phase of current according to the three-phase current and the three-phase voltage sinusoidal signals;
the active current calculation module is used for multiplying the active current amplitude of each phase of fundamental wave by the three-phase voltage sinusoidal signal to obtain the active current of each phase of fundamental wave;
the reactive and harmonic current calculation module is used for obtaining reactive and harmonic currents of each phase according to the three-phase current and the three-phase fundamental active current;
the average value calculation module is used for calculating the average value of the active current amplitude of each phase of fundamental wave according to the active current amplitude of each phase of fundamental wave;
the current amplitude difference calculation module is used for subtracting the average value of the active current amplitude of each phase fundamental wave from the average value of the active current amplitude of each phase fundamental wave to obtain the active current amplitude difference of each phase fundamental wave;
the current to be regulated determining module is used for multiplying the amplitude difference of the active current of each phase of fundamental wave by the sinusoidal signal of the three-phase voltage to obtain the active current of the fundamental wave to be regulated;
the voltage loop output acquisition module is used for acquiring voltage loop output through a proportional-integral regulator according to the difference between the given direct-current side voltage and the actual voltage;
and the instruction determining module is used for adding the fundamental wave active current to be regulated, the reactive and harmonic currents of each phase and the instruction current output by the voltage loop to obtain an actual instruction current, and carrying out the balancing operation of each phase current according to the actual instruction current.
Optionally, the active current amplitude calculation module specifically includes:
the component calculation unit is used for multiplying the three-phase current by the three-phase voltage sinusoidal signals respectively to obtain a result containing a direct-current component and an alternating-current component;
and the current amplitude calculation unit is used for obtaining the active current amplitude of each phase of fundamental wave according to the direct current component in the result.
Optionally, the reactive power and harmonic current calculation module obtains each phase of reactive power and harmonic current according to the three-phase current and each phase of fundamental wave active current, and specifically includes:
and subtracting the active current of each phase fundamental wave from the three-phase current to obtain the reactive current and the harmonic current of each phase.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention extracts the fundamental wave amplitude of each phase of current, calculates the average value of the fundamental wave amplitude of the three-phase current, takes the average value as the given value of the fundamental wave amplitude of each phase of current, combines the given value with the phase information of each phase of current to obtain the real-time given target value of each phase of current, and carries out real-time adjustment according to the target value adjuster, so that the real-time tracking target value of the actual value of each phase of current can realize the balance of the three-phase current. The invention is applied to a three-phase four-wire system power grid, can inhibit reactive power and harmonic waves in each phase of current, and simultaneously enables the three-phase current to be balanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a determination method for power quality comprehensive management according to an embodiment of the present invention;
FIG. 2 is a block diagram of a system for determining power quality comprehensive management according to an embodiment of the present invention;
FIG. 3 is a topology of an integrated power quality manager according to an embodiment of the present invention;
FIG. 4 is a diagram of a calculation method for comprehensive treatment of power quality according to an embodiment of the present invention;
FIG. 5(a) is a waveform of an experiment of a nonlinear load current under a three-phase imbalance condition;
FIG. 5(b) shows the non-linear load current THD and the effective value under three-phase imbalance conditions;
FIG. 5(c) is a net side experimental waveform under three-phase imbalance conditions using the algorithm of the present invention;
FIG. 5(d) shows net side current THD and effective values under three-phase imbalance conditions using the algorithm of the present invention;
FIG. 6(a) is the experimental waveform of the nonlinear load AB phase and neutral current under three-phase imbalance;
FIG. 6(b) shows the effective values and phase AB and neutral current THD of the nonlinear load under three-phase imbalance conditions;
FIG. 6(c) is a waveform of an experiment of the line side AB phase and neutral line current under the condition of three-phase imbalance by using the algorithm of the present invention;
FIG. 6(d) shows the net side AB phase and neutral line current THD and effective values under three-phase imbalance conditions using the algorithm of the present invention;
FIG. 7(a) is a waveform of an AB phase on the front and rear network sides and a compensated neutral current experiment by using the algorithm of the present invention;
fig. 7(b) shows the AB phase on the front and back network sides and the compensated neutral current THD and effective value using the algorithm of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a determination method and a determination system for comprehensive management of electric energy quality, which solve the problems that reactive power and harmonic waves in each phase of current cannot be inhibited, and the balance of three-phase current cannot be realized.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a determination method for power quality integrated management according to an embodiment of the present invention. Referring to fig. 1, a method for determining power quality integrated management includes:
step 101: respectively measuring three-phase circuits of a power supply end to obtain three-phase currents;
step 102: performing phase locking on the three-phase circuit to obtain a three-phase voltage sinusoidal signal with the same frequency and the same phase as the voltage of the three-phase circuit;
step 103: obtaining the active current amplitude of each phase of fundamental wave corresponding to each phase of current according to the three-phase current and the three-phase voltage sinusoidal signal;
step 104: multiplying the active current amplitude of each phase of fundamental wave by the three-phase voltage sinusoidal signal to obtain the active current of each phase of fundamental wave;
step 105: obtaining each phase of reactive power and harmonic current according to the three-phase current and the fundamental wave active current of each phase;
step 106: calculating the average value of the active current amplitude of each phase fundamental wave according to the active current amplitude of each phase fundamental wave;
step 107: subtracting the average value of the active current amplitude of each phase fundamental wave from the average value of the active current amplitude of each phase fundamental wave to obtain the active current amplitude difference of each phase fundamental wave;
step 108: multiplying the amplitude difference of the active current of each phase of fundamental wave with the three-phase voltage sinusoidal signal to obtain the active current of the fundamental wave to be regulated;
step 109: obtaining voltage loop output through a proportional integral regulator according to the difference between the given direct current side voltage and the actual voltage;
step 110: adding the fundamental wave active current to be regulated, the reactive and harmonic currents of each phase and the command current output by the voltage loop to obtain an actual command current, and performing the balancing operation of each phase current according to the actual command current.
The obtaining of the active current amplitude of each phase of fundamental wave corresponding to each phase of current according to the three-phase current and the three-phase voltage sinusoidal signal specifically includes:
the result obtained by multiplying the three-phase current by the three-phase voltage sinusoidal signal respectively contains a direct current component and an alternating current component;
and obtaining the active current amplitude of each phase of fundamental wave according to the direct current component in the result.
Obtaining each phase of reactive power and harmonic current according to the three-phase current and each phase of fundamental wave active current specifically comprises:
and subtracting the active current of each phase fundamental wave from the three-phase current to obtain the reactive current and the harmonic current of each phase.
Obtaining the active current amplitude of the fundamental wave of each phase according to the direct-current component of the current of each phase specifically includes:
according to formula Ip＝kI1Wherein, IpThe active current amplitude of each phase fundamental wave is taken as the active current amplitude of each phase fundamental wave; i is1K is a natural number greater than 0, and is 2 in this embodiment, which is a direct-current component of the current of each phase.
By adopting the method, the real-time given target value of each phase current can be obtained, and real-time adjustment is carried out according to the target value adjuster, so that the actual value of each phase current tracks the target value in real time, and the balance of the three-phase current can be realized.
Fig. 2 is a block diagram of a determination system for power quality integrated management according to an embodiment of the present invention. Referring to fig. 2, a determination system for integrated management of power quality includes:
the current acquisition module 201 is configured to measure three-phase circuits at a power supply end respectively to obtain three-phase currents;
the voltage sinusoidal signal determination module 202 is used for performing phase locking on the three-phase circuit to obtain a three-phase voltage sinusoidal signal with the same frequency and the same phase as the three-phase circuit voltage;
the active current amplitude calculation module 203 is configured to obtain an active current amplitude of each phase of fundamental wave corresponding to each phase of current according to the three-phase current and the three-phase voltage sinusoidal signal;
the active current calculation module 204 is configured to obtain each phase fundamental wave active current by multiplying the each phase fundamental wave active current amplitude by the three-phase voltage sinusoidal signal;
a reactive and harmonic current calculation module 205, configured to obtain each phase of reactive and harmonic currents according to the three-phase current and the three-phase fundamental active current;
an average value calculating module 206, configured to calculate an average value of the active current amplitude of each phase fundamental wave according to the active current amplitude of each phase fundamental wave;
a current amplitude difference calculation module 207, configured to subtract the average value of the active current amplitude of each phase fundamental wave from the average value of the active current amplitude of each phase fundamental wave to obtain an active current amplitude difference of each phase fundamental wave;
the current to be regulated determining module 208 is configured to multiply the amplitude difference of the active current of each phase of fundamental wave by the sinusoidal signal of the three-phase voltage to obtain an active current of the fundamental wave to be regulated;
a voltage loop output obtaining module 209, configured to obtain a voltage loop output through a proportional-integral regulator according to a difference between a given dc-side voltage and an actual voltage;
and the instruction determining module 210 is configured to add the fundamental active current to be adjusted, the reactive and harmonic currents of each phase, and the instruction current output by the voltage loop to obtain an actual instruction current, and perform each phase current balancing operation according to the actual instruction current.
The active current amplitude calculation module 203 specifically includes:
the component calculation unit is used for multiplying the three-phase current by the three-phase voltage sinusoidal signals respectively to obtain a result containing a direct-current component and an alternating-current component;
and the current amplitude calculation unit is used for obtaining the active current amplitude of each phase of fundamental wave according to the direct current component in the result.
The reactive and harmonic current calculation module 205 obtains each phase of reactive and harmonic currents according to the three-phase current and the fundamental wave active current of each phase, and specifically includes:
and subtracting the active current of each phase fundamental wave from the three-phase current to obtain the reactive current and the harmonic current of each phase.
By adopting the system, reactive power and harmonic waves in each phase of current can be inhibited, and the three-phase current is balanced.
Fig. 3 is a topology of an integrated power quality manager according to an embodiment of the present invention. See FIG. 3, wherein ua、ub、ucTo the grid side phase voltage, ia、ib、icIs the load side phase current.
1) Sampling three-phase unbalanced current at load side to obtain ia、ib、ic；
2) Taking a sine signal with a peak value of 1 and the same frequency and the same phase as the three-phase power grid voltage: u. ofa、ub、ucAnd multiplied by the corresponding three-phase current, taking phase A as an example:
3) as shown in fig. 4, the result obtained by multiplying the dc component and the ac component is filtered by a low-pass filter to obtain a dc componentI.e. the amplitude I of the active current of the fundamental wavepaHalf of that. Thereby obtainingTo the fundamental wave active current amplitude IpaIs multiplied by the sine signal sin ω t obtained by phase locking to obtain the fundamental wave active current ipa(t)(ii) a By the same way, obtain ipb(t)、ipc(t)。
4) The A phase current iaThe active part of the fundamental wave is filtered out, and the rest reactive and harmonic currents are obtained:
iLa(t)＝ia(t)-ipa(t)
by the same way, obtain iLb(t)、iLc(t)。
5) The average value of the three-phase fundamental wave active current amplitude is calculated as:
and (3) respectively subtracting the three-phase fundamental wave active current amplitude values with the three-phase fundamental wave active current amplitude values to obtain the fundamental wave active current amplitude values to be adjusted under a three-phase static coordinate system:
ΔIpa＝Ipa-Ipave
ΔIpb＝Ipb-Ipave
ΔIpc＝Ipc-Ipave
6) the fundamental wave active current amplitude value which needs to be adjusted and the sine signal sin omega t which is obtained by phase locking are obtained,Multiplying to obtain fundamental wave active current delta i to be regulatedpa、Δipb、ΔipcAnd adding the detected reactive and harmonic currents and the command current output by the voltage loop to obtain the actual command current.
In an embodiment of the invention, given a grid-side alternating current of 230V, a load-side 2mH inductor and a 1000MFD capacitor, three phases have experimental waveforms of 107 Ω, 50 Ω and 50 Ω respectively. In the experimental process, a power quality analyzer is used for measuring the waveforms, effective values and THD before and after the power quality comprehensive treatment algorithm is adopted. Fig. 5(a) and 5(b) show waveforms, effective values and THD of a nonlinear load experiment under a three-phase unbalanced condition, where the waveforms of load currents have not only large harmonics and reactive power but also different effective values due to the three-phase load imbalance; fig. 5(c) and 5(d) show the net side current experimental waveform, effective value and THD under the three-phase imbalance condition by using the algorithm of the present invention, and it can be seen that the net side current reactive power and the harmonic current are compensated, and the fundamental wave active components of the three-phase current are also balanced. Fig. 6(a), 6(b), 6(c) and 6(d) are comparisons of waveforms of AB two-phase and neutral currents, and it can be seen that the load imbalance generates a large neutral current, and the algorithm can effectively balance the three-phase currents and suppress the neutral current. Fig. 7(a) and 7(b) are graphs showing comparison of network side current waveforms, effective values and THD obtained by passing the neutral current through the power quality analyzer before and after the power quality comprehensive treatment algorithm and after compensation for a single phase.
The invention provides a calculation method for comprehensive management of electric energy quality for compensating reactive power and harmonic current and balancing three-phase current in a three-phase four-wire system power grid. The invention uses a single-phase harmonic detection algorithm to separate the active, harmonic and reactive of the fundamental wave of the load current, and calculates the three-phase fundamental wave active current to be regulated, thereby obtaining the instruction current.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (8)

1. A method for determining comprehensive management of power quality is characterized by comprising the following steps:
respectively measuring three-phase circuits of a power supply end to obtain three-phase currents;
performing phase locking on the three-phase circuit to obtain a three-phase voltage sinusoidal signal with the same frequency and the same phase as the voltage of the three-phase circuit;
obtaining the active current amplitude of each phase of fundamental wave corresponding to each phase of current according to the three-phase current and the three-phase voltage sinusoidal signal;
multiplying the active current amplitude of each phase of fundamental wave by the three-phase voltage sinusoidal signal to obtain the active current of each phase of fundamental wave;
obtaining each phase of reactive power and harmonic current according to the three-phase current and the fundamental wave active current of each phase;
obtaining the average value of the active current amplitude of each phase fundamental wave according to the active current amplitude of each phase fundamental wave;
subtracting the average value of the active current amplitude of each phase fundamental wave from the average value of the active current amplitude of each phase fundamental wave to obtain the active current amplitude difference of each phase fundamental wave;
multiplying the amplitude difference of the active current of each phase of fundamental wave with the three-phase voltage sinusoidal signal to obtain the active current of the fundamental wave to be regulated;
obtaining voltage loop output through a proportional integral regulator according to the difference between the given direct current side voltage and the actual voltage;
adding the fundamental wave active current to be regulated, the reactive and harmonic currents of each phase and the command current output by the voltage loop to obtain an actual command current, and performing the balancing operation of each phase current according to the actual command current.
2. The method for determining the comprehensive management of the power quality as claimed in claim 1, wherein the obtaining of the active current amplitude of each phase of fundamental wave corresponding to each phase of current according to the three-phase current and the three-phase voltage sinusoidal signal specifically comprises:
the result obtained by multiplying the three-phase current by the three-phase voltage sinusoidal signal respectively contains a direct current component and an alternating current component;
and obtaining the active current amplitude of each phase of fundamental wave according to the direct current component in the result.
3. The method for determining the comprehensive management of the quality of electric energy according to claim 1, wherein the obtaining of the reactive current and the harmonic current of each phase according to the three-phase current and the fundamental wave active current of each phase specifically comprises:
and subtracting the active current of each phase fundamental wave from the three-phase current to obtain the reactive current and the harmonic current of each phase.
4. The method for determining electric energy quality comprehensive management according to claim 2, wherein the obtaining the active current amplitude of each phase of fundamental wave according to the dc component of each phase of current specifically comprises:
according to formula Ip＝kI1Wherein, IpThe active current amplitude of each phase fundamental wave is taken as the active current amplitude of each phase fundamental wave; i is1K is a natural number greater than 0 as a direct-current component of the current of each phase.
5. The method for determining electric energy quality comprehensive management according to claim 4, wherein k is 2.
6. A system for determining integrated management of power quality, comprising:
the current acquisition module is used for respectively measuring the three-phase circuits of the power supply end to obtain three-phase currents;
the voltage sinusoidal signal determination module is used for performing phase locking on the three-phase circuit to obtain a three-phase voltage sinusoidal signal with the same frequency and the same phase as the three-phase circuit voltage;
the active current amplitude calculation module is used for obtaining the active current amplitude of each phase of fundamental wave corresponding to each phase of current according to the three-phase current and the three-phase voltage sinusoidal signals;
the active current calculation module is used for multiplying the active current amplitude of each phase of fundamental wave by the three-phase voltage sinusoidal signal to obtain the active current of each phase of fundamental wave;
the reactive and harmonic current calculation module is used for obtaining reactive and harmonic currents of each phase according to the three-phase current and the fundamental wave active current of each phase;
the average value calculation module is used for calculating the average value of the active current amplitude of each phase of fundamental wave according to the active current amplitude of each phase of fundamental wave;
the current amplitude difference calculation module is used for subtracting the average value of the active current amplitude of each phase fundamental wave from the average value of the active current amplitude of each phase fundamental wave to obtain the active current amplitude difference of each phase fundamental wave;
the current to be regulated determining module is used for multiplying the amplitude difference of the active current of each phase of fundamental wave by the sinusoidal signal of the three-phase voltage to obtain the active current of the fundamental wave to be regulated;
the voltage loop output acquisition module is used for acquiring voltage loop output through a proportional-integral regulator according to the difference between the given direct-current side voltage and the actual voltage;
and the instruction determining module is used for adding the fundamental wave active current to be regulated, the reactive and harmonic currents of each phase and the instruction current output by the voltage loop to obtain an actual instruction current, and carrying out the balancing operation of each phase current according to the actual instruction current.
7. The system for determining the comprehensive management of the quality of electric energy according to claim 6, wherein the active current amplitude calculation module specifically comprises:
the component calculation unit is used for multiplying the three-phase current by the three-phase voltage sinusoidal signals respectively to obtain a result containing a direct-current component and an alternating-current component;
and the current amplitude calculation unit is used for obtaining the active current amplitude of each phase of fundamental wave according to the direct current component in the result.
8. The system for determining the comprehensive management of the electric energy quality according to claim 6, wherein the reactive and harmonic current calculation module obtains the reactive and harmonic currents of each phase according to the three-phase current and the fundamental wave active current of each phase, and specifically comprises:
and subtracting the active current of each phase fundamental wave from the three-phase current to obtain the reactive current and the harmonic current of each phase.
CN201810014505.1A 2018-01-08 2018-01-08 Method and system for determining comprehensive management of power quality Active CN108054763B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810014505.1A CN108054763B (en) 2018-01-08 2018-01-08 Method and system for determining comprehensive management of power quality

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810014505.1A CN108054763B (en) 2018-01-08 2018-01-08 Method and system for determining comprehensive management of power quality

Publications (2)

Publication Number Publication Date
CN108054763A CN108054763A (en) 2018-05-18
CN108054763B true CN108054763B (en) 2019-12-31

Family

ID=62126762

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810014505.1A Active CN108054763B (en) 2018-01-08 2018-01-08 Method and system for determining comprehensive management of power quality

Country Status (1)

Country Link
CN (1) CN108054763B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114070157B (en) * 2020-08-04 2023-06-16 美的威灵电机技术（上海）有限公司 Control method of motor based on induced electromotive force, motor and storage medium
CN112924798B (en) * 2021-02-08 2022-11-08 北京中电普华信息技术有限公司 Power quality monitoring method and device and electronic equipment

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110264299A1 (en) * 2010-04-27 2011-10-27 Siemens Industry, Inc. Method and system for managing power quality and efficiency
CN103545828B (en) * 2013-11-04 2015-08-12 湖南大学 A kind of star chain type SVG individual-phase control method under uneven operating mode
CN104535820A (en) * 2014-12-22 2015-04-22 国家电网公司 Three-phase active power filter harmonic current detection method based on FBD method
CN107425703B (en) * 2017-06-20 2020-06-19 株洲中车时代电气股份有限公司 Calculation method and system for optimal harmonic distribution SHEPWM switching angle

Also Published As

Publication number Publication date
CN108054763A (en) 2018-05-18

Similar Documents

Publication Publication Date Title
Salmeron et al. A control strategy for hybrid power filter to compensate four-wires three-phase systems
Singh et al. Implementation of single-phase enhanced phase-locked loop-based control algorithm for three-phase DSTATCOM
Ucar et al. Control of a 3-phase 4-leg active power filter under non-ideal mains voltage condition
US7834643B2 (en) Systems and methods for reducing distortion in a power source using an active harmonics filter
Pádua et al. Frequency-adjustable positive sequence detector for power conditioning applications
Viji et al. Enhanced PLL based SRF control method for UPQC with fault protection under unbalanced load conditions
US20110128054A1 (en) Phase lock loop with tracking filter for synchronizing an electric grid
Wamane et al. A comparative study on compensating current generation algorithms for shunt active filter under non-linear load conditions
Thomas et al. Practical evaluation of unbalance and harmonic distortion in power conditioning
CN108054763B (en) Method and system for determining comprehensive management of power quality
Devassy et al. Control of solar energy integrated active power filter in weak grid system
Razali et al. Implementation of dq decoupling and feed-forward current controller for grid connected three phase voltage source converter
Biricik et al. Control of the shunt active power filter under non-ideal grid voltage and unbalanced load conditions
Kumar et al. PI, fuzzy logic controlled shunt active power filter for three-phase four-wire systems with balanced, unbalanced and variable loads
KR100706181B1 (en) Single-Phase Active Power Filter Using Rotating Reference Frame
Tsengenes et al. An improved current control technique for the investigation of a power system with a shunt active filter
CN106787650B (en) The Direct Current that active secondary pulsation inhibits under unbalanced power supply instructs calculation method
Razali et al. Real-time implementation of dq control for grid connected three phase voltage source converter
Gupta et al. PIL based control algorithm for three-phase four-wire active filter for reactive and harmonic compensation under distorted supply
Chittora et al. Harmonic current extraction and compensation in three phase three wire system using notch filter
Subudhi et al. A comparative assessment of hysteresis and dead beat controllers for performances of three phase shunt active power filtering
Jiao et al. A double reduced order generalized integrator based algorithm for control of four-leg converter to enhance power quality
Agrawal et al. Performance Evaluation of 3-Phase 4-Wire SAPF based on Synchronizing EPLL with Fuzzy Logic Controller
Tanaka et al. A novel real-time detection method of active and reactive currents for single-phase active power filters
Naik et al. Comparison of three popular control strategies used in shunt active power filters

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20210423

Address after: 4 / F, Hefei Institute of technology innovation, Chinese Academy of Sciences, 2666 Xiyou Road, high tech Zone, Hefei, Anhui 230000

Patentee after: ANHUI CAS-HIAU ELECTRICAL Inc.

Address before: 230000 No. 193, Tunxi Road, Hefei, Anhui

Patentee before: Hefei University of Technology

TR01 Transfer of patent right
PE01 Entry into force of the registration of the contract for pledge of patent right
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of invention: A determination method and system of comprehensive power quality management

Effective date of registration: 20211229

Granted publication date: 20191231

Pledgee: Guangdong Development Bank Co.,Ltd. Hefei Branch

Pledgor: ANHUI CAS-HIAU ELECTRICAL Inc.

Registration number: Y2021980016831

PC01 Cancellation of the registration of the contract for pledge of patent right

Date of cancellation: 20221229

Granted publication date: 20191231

Pledgee: Guangdong Development Bank Co.,Ltd. Hefei Branch

Pledgor: ANHUI CAS-HIAU ELECTRICAL Inc.

Registration number: Y2021980016831

PC01 Cancellation of the registration of the contract for pledge of patent right
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of invention: A method and system for determining the comprehensive management of power quality

Effective date of registration: 20230104

Granted publication date: 20191231

Pledgee: Guangdong Development Bank Co.,Ltd. Hefei Branch

Pledgor: ANHUI CAS-HIAU ELECTRICAL Inc.

Registration number: Y2023980030189

PE01 Entry into force of the registration of the contract for pledge of patent right
PC01 Cancellation of the registration of the contract for pledge of patent right

Granted publication date: 20191231

Pledgee: Guangdong Development Bank Co.,Ltd. Hefei Branch

Pledgor: ANHUI CAS-HIAU ELECTRICAL Inc.

Registration number: Y2023980030189

PC01 Cancellation of the registration of the contract for pledge of patent right
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of invention: A method and system for determining comprehensive management of power quality

Granted publication date: 20191231

Pledgee: Guangdong Development Bank Co.,Ltd. Hefei Branch

Pledgor: ANHUI CAS-HIAU ELECTRICAL Inc.

Registration number: Y2024980004556

PE01 Entry into force of the registration of the contract for pledge of patent right