CN111224400A - Electric energy quality treatment device and electric energy compensation method thereof - Google Patents

Electric energy quality treatment device and electric energy compensation method thereof Download PDF

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CN111224400A
CN111224400A CN201811407456.4A CN201811407456A CN111224400A CN 111224400 A CN111224400 A CN 111224400A CN 201811407456 A CN201811407456 A CN 201811407456A CN 111224400 A CN111224400 A CN 111224400A
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蒋成明
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • 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

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

Abstract

The invention discloses an electric energy quality treatment device and an electric energy compensation method thereof. The electric energy compensation method comprises the following steps: s1, detecting the voltage and the current of the power system, and calculating the three-phase voltage unbalance, the voltage distortion rate and the system power factor according to an algorithm; s2, comparing the three-phase voltage unbalance, the voltage distortion rate and the system power factor with respective specified values to obtain a compensated priority; s3, detecting the load current of the power system and calculating the current component; s4, calculating the amplitude limiting coefficient of each current component according to the priority order; s5, multiplying each current component by the corresponding amplitude limiting coefficient to obtain a current component value needing to be compensated; and S6, compensating the power system according to the current component value. The device comprises a memory and one or more processors, and the processors realize the power compensation method. The invention can ensure the normal operation of power generation, transmission, distribution and utilization.

Description

Electric energy quality treatment device and electric energy compensation method thereof
Technical Field
The invention relates to the technical field of electronic power, in particular to an electric energy quality control device and an electric energy compensation method thereof.
Background
In a modern power system, due to the wide application of high-power semiconductor current conversion equipment and an electronic voltage regulating device and the common use of power electronic elements represented by thyristors and diodes, non-sinusoidal current is brought to the power system, so that a large amount of power harmonic waves are injected; the application of a large amount of capacitive loads causes a large amount of reactive current to flow into a power grid, so that the power factor of the system is reduced, and the capacitive loads cannot be treated by adopting the traditional capacitance switching compensation device; the problem of unbalance of the three-phase system is serious due to uneven distribution of three-phase power when a large number of single-phase loads are connected into the three-phase system. In an electric power system, generation, transmission, distribution and utilization of electricity are affected to different degrees due to the existence of harmonic, reactive and unbalanced currents.
Disclosure of Invention
The technical problem solved by the invention is as follows: in an electric power system, generation, transmission, distribution and utilization of electricity are affected to different degrees due to the existence of harmonic, reactive and unbalanced currents. Therefore, the invention provides an electric energy quality control device and an electric energy compensation method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
a power compensation method of a power quality management device comprises the following steps:
s1, detecting the voltage and the current of the power system, and calculating the three-phase voltage unbalance, the voltage distortion rate and the system power factor according to an algorithm;
s2, comparing the three-phase voltage unbalance, the voltage distortion rate and the system power factor with respective specified values to obtain a compensated priority;
s3, detecting the load current of the power system, calculating current components, and respectively calculating harmonic current components I of the power systemhReactive current component ILNegative sequence current component InZero sequence current component I0The harmonic current component IhThe reactive current component ILThe negative-sequence current component InThe zero sequence current component I0With rated output current IoutHas a significant value ofout 2＝Ih 2+IL 2+In 2+I0 2；
S4, calculating the amplitude limiting coefficient of each current component according to the priority order;
s5, multiplying each current component by the corresponding amplitude limiting coefficient to obtain a current component value needing to be compensated;
and S6, compensating the power system according to the current component value.
In some preferred embodiments, the S2 is specifically: and judging whether the three-phase voltage unbalance, the voltage distortion rate and the system power factor meet the three-phase unbalance of more than 2%, the voltage distortion rate of more than 5% and the system power factor of less than 0.85, if any one meets, judging the corresponding current components as a first priority, and if multiple meets, parallelly arranging the corresponding current components as equal priorities in an equal manner.
In some preferred embodiments, if the effective value of the current component corresponding to the first priority is greater than the effective value of the rated output current, the clipping coefficient of the first priority is calculated by dividing the effective value of the rated output current by the effective value of the current component corresponding to the first priority; and if the effective value of the current component corresponding to the first priority is smaller than the effective value of the rated output current, the amplitude limiting coefficient of the first priority is 1.
In some preferred embodiments, on the premise that the clipping coefficient of the first priority is 1, if the square value of the current component corresponding to the second priority is greater than the difference between the square of the effective value of the rated output current and the square value of the current component corresponding to the first priority, the clipping coefficient of the second priority is calculated by dividing the difference between the square of the effective value of the rated output current and the square value of the current component corresponding to the first priority by the square of the effective value of the current component corresponding to the second priority, and opening the sign to obtain the clipping coefficient of the second priority; and if the effective value of the current component corresponding to the second priority is smaller than the difference value between the square of the effective value of the rated output current and the square of the effective value of the current component corresponding to the first priority, the amplitude limiting coefficient of the second priority is 1.
In some preferred embodiments, on the premise that the clipping coefficient of the second priority is 1, if the square value of the effective value of the current component corresponding to the third priority is greater than the difference between the square of the effective value of the rated output current and the sum of the squares of the effective values of the current components corresponding to the first and second priorities, the clipping coefficient of the third priority is calculated by dividing the difference between the square of the effective value of the rated output current and the sum of the squares of the effective values of the current components corresponding to the first and second priorities by the square of the effective value of the current component corresponding to the third priority, and root-cutting to obtain the clipping coefficient of the third priority; and if the square of the effective value of the current component corresponding to the third priority is smaller than the square of the effective value of the rated output current minus the square of the effective values of the current components corresponding to the first priority and the second priority, the amplitude limiting coefficient of the third priority is 1.
In some preferred embodiments, in the case of equal priority, the sum of squares of the effective values of the equal two or three current components is compared with the square value of the effective value of the rated current in magnitude, and if the sum of squares of the effective values of the equal current components is larger, an equal clipping coefficient is calculated by dividing the sum of squares of the effective values of the equal current components by the square of the effective value of the rated output current and opening the root to obtain the clipping coefficient of equal priority; if the sum of squares of the effective values of the equal current components is small, the clipping coefficient of the equal priority is 1.
In some preferred embodiments, the algorithm includes a fast fourier method, an instantaneous reactive power method, a symmetric component method.
In some preferred embodiments, the compensation corresponding to the three-phase voltage unbalance, the voltage distortion rate and the system power factor is imbalance correction, harmonic suppression and reactive compensation, and the priority includes:
harmonic treatment > reactive compensation > unbalance correction;
harmonic treatment > unbalance correction > reactive compensation;
reactive compensation, harmonic treatment and unbalance correction;
reactive compensation, unbalance correction and harmonic treatment;
imbalance correction > reactive compensation > harmonic treatment;
imbalance correction, harmonic treatment and reactive compensation;
harmonic wave treatment, namely reactive compensation is larger than unbalance correction;
harmonic wave treatment, namely unbalance correction is greater than reactive compensation;
reactive compensation, namely unbalance correction, harmonic treatment;
harmonic control refers to reactive compensation and imbalance correction.
In another aspect, the present invention provides a power quality management apparatus comprising a memory and one or more processors implementing the above power compensation method.
In another aspect, the present invention also provides a computer-readable storage medium storing a computer program for use in conjunction with a computing device, the computer program being executable by a processor to implement the above-described power compensation method.
Compared with the prior art, the invention has the beneficial effects that:
the three-phase voltage unbalance, the voltage distortion rate, the system power factor and other power quality indexes are respectively compared with respective specified values to obtain the priority of compensation, namely various power quality problems existing in the power system are analyzed, and the serious power quality problems are selected as main treatment objects. And calculating the amplitude limiting coefficient of each current component according to the priority order, thereby obtaining the current component value needing to be compensated. So, through the amplitude limiting, under the prerequisite of guaranteeing that the output of power quality governance device is full-loaded, effectively carry out power quality and administer. Under the condition that the capacity of the power quality treatment device is limited, the main power quality problem is effectively treated. The three power quality problems can be solved simultaneously, the three power quality problems are effective ways of harmonic wave treatment, reactive power compensation and three-phase unbalance correction, and normal operation of power generation, transmission, distribution and power utilization can be ensured.
Drawings
FIG. 1 is a schematic flow chart of a power compensation method of the power quality management apparatus of the present invention;
FIG. 2 is a schematic diagram of the process of priority determination of the present invention;
fig. 3 is a schematic diagram illustrating a process of calculating the clipping coefficient of the first priority according to the first embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a process of calculating the clipping coefficient of the second priority according to the first embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a process of calculating a clipping coefficient of a third priority according to the first embodiment of the present invention;
FIG. 6 is a diagram illustrating the calculation of the clipping coefficients for equal priority in the third embodiment of the present invention;
fig. 7 is a diagram illustrating a process of calculating the clipping coefficients of equal priority in the fourth embodiment of the present invention.
Detailed Description
Referring to fig. 1 to 7, embodiments of the present invention will be described in detail below. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Referring to fig. 1, the power compensation method of the power quality management device of the present invention includes steps S1 to S6.
And step S1, detecting the voltage and the current of the power system, and calculating the three-phase voltage unbalance, the voltage distortion rate and the system power factor according to the algorithm. The voltage and the current of the power system are detected through the sensors, and the voltage and the current of the load can be detected, the voltage harmonic distortion rate of the power system is calculated by using a fast Fourier method, the power factor of the power system is calculated by using an instantaneous reactive power method, and the three-phase unbalance degree of the power system is calculated by using a symmetrical component method.
And S2, comparing the three-phase voltage unbalance, the voltage distortion rate and the system power factor with respective specified values to obtain the priority of compensation. And respectively comparing the values of the three power quality indexes with a three-phase unevenness requirement limit value, a voltage distortion rate requirement limit value and a system power factor requirement limit value specified by the national standard through a comparator. For example, whether the three-phase voltage unbalance, the voltage distortion rate and the system power factor are judgedThe three-phase unbalance degree is more than 2%, the voltage distortion rate is more than 5%, the system power factor is less than 0.85, if any one is satisfied, the corresponding current component is judged as the first priority, and if multiple items are satisfied, the corresponding current components are in equal parallel and are in equal priority. Wherein, the current component corresponding to the three-phase voltage unbalance is a negative sequence current component InAnd zero sequence current component I0The current component corresponding to the voltage distortion rate is a harmonic current component IhThe current component corresponding to the system power factor is a reactive current component IL。
And when the unevenness of the three-phase voltage exceeds 2%, the three-phase unbalance compensation is preferentially selected. Reactive compensation is preferably selected when the system power factor is less than 0.85. And when the grid voltage distortion rate is detected to be greater than 5%, preferentially selecting harmonic compensation. When any two or three of the three power quality indexes exceed the requirements of the specified indexes, the compensation priorities of the exceeded indexes are equal. In this way, the following priorities can be obtained:
harmonic treatment > reactive compensation > unbalance correction;
harmonic treatment > unbalance correction > reactive compensation;
reactive compensation, harmonic treatment and unbalance correction;
reactive compensation, unbalance correction and harmonic treatment;
imbalance correction > reactive compensation > harmonic treatment;
imbalance correction, harmonic treatment and reactive compensation;
harmonic wave treatment, namely reactive compensation is larger than unbalance correction;
harmonic wave treatment, namely unbalance correction is greater than reactive compensation;
reactive compensation, namely unbalance correction, harmonic treatment;
harmonic control refers to reactive compensation and imbalance correction.
S3, detecting the load current of the power system, calculating the current component, and respectively calculating the harmonic current component I of the power systemhReactive current component ILNegative sequence current component InZero sequence current component I0Harmonic currentComponent IhReactive current component ILNegative sequence current component InZero sequence current component I0With rated output current IoutHas a significant value ofout 2＝Ih 2+IL 2+In 2+I0 2. Calculating harmonic current component I of load by using fast Fourier methodhCalculating the load reactive current component I by using the instantaneous reactive power methodLCalculating the load current negative sequence current component I by using a symmetric component methodnAnd zero sequence current component I0。
And S4, calculating the amplitude limiting coefficient of each current component according to the priority order. And on the premise of priority order confirmation, amplitude judgment is respectively carried out on the current components which are compensated preferentially in sequence, each current component is compared with the amplitude of the rated output current by using a comparator, and the calculation of the amplitude limiting parameter is completed by using a divider and opening a root number.
Specifically, the current component corresponding to the priority is squared and compared with the square value of the rated output current, and if the current component is greater than the square value of the rated output current, the amplitude limiting coefficient is calculated. For the calculation of the amplitude limiting coefficient, the square value of the current component corresponding to the priority is divided by the square of the effective value of the rated output current, and the obtained value is subjected to root cutting, so that the amplitude limiting coefficient of the current component corresponding to the priority can be obtained.
And S5, multiplying each current component by the corresponding amplitude limiting coefficient to obtain the current component value needing to be compensated. And multiplying each current component by the corresponding amplitude limiting coefficient by using a multiplier respectively to obtain the current component value of amplitude limiting output.
And S6, compensating the power system according to the current component value. The electric energy quality treatment device treats harmonic waves, compensates reactive power and corrects three-phase imbalance of the electric power system according to the current component values and the priority.
According to the method, the three-phase voltage unbalance, the voltage distortion rate, the system power factor and other electric energy quality indexes are respectively compared with respective specified values to obtain the compensated priority, namely, various electric energy quality problems existing in the electric power system are analyzed, and the serious electric energy quality problems are selected as main treatment objects. And calculating the amplitude limiting coefficient of each current component according to the priority order, thereby obtaining the current component value needing to be compensated. So, through the amplitude limiting, under the prerequisite of guaranteeing that the output of power quality governance device is full-loaded, effectively carry out power quality and administer. Under the condition that the capacity of the power quality treatment device is limited, the main power quality problem is effectively treated. The three power quality problems can be solved simultaneously, the three power quality problems are effective ways of harmonic wave treatment, reactive power compensation and three-phase unbalance correction, and normal operation of power generation, transmission, distribution and power utilization can be ensured.
The following provides a detailed description of embodiments of the invention.
In the first embodiment of the present invention, referring to fig. 2, through detection and analysis, if none of the three power quality problems exceeds the national standard, the three-phase unbalanced current component, the harmonic current component and the reactive current component of the power system are compared in amplitude, and logical judgment is performed, where the larger one is the first priority, the middle one is the second priority, and the smaller one is the third priority, where the three-phase unbalanced current component is the negative sequence current component InAnd zero sequence current component I0The root of the sum of squares.
After the priorities have been determined, with reference to fig. 3, the effective value of the current component I1 corresponding to the first priority is compared with the rated output current IoutIf the effective value I1 of the first priority is larger, the clipping coefficient K1 of the first priority is determined by the rated output current I1outIs calculated by dividing the effective value of the current component I1 corresponding to the first priority. Otherwise, the clipping coefficient K1 of the first priority is 1.
Referring to fig. 4, if the first priority clipping coefficient K1 is calculated to be 1, the second priority clipping coefficient calculation is performed to calculate the rated output current IoutThe square of the effective value of the current component I1 corresponding to the first priority is subtracted from the square of the effective value of the current component I1 corresponding to the first priority, and the resulting subtraction is compared with the square of the effective value of the current component I2 corresponding to the second priority, for exampleIf the square value of the effective value of the current component I2 corresponding to the level is larger, dividing the subtraction number by the square value of the effective value of the current component I2 corresponding to the second priority, and opening the root to obtain an amplitude limiting coefficient K2 of the second priority; if the square value of the effective value of the current component I2 corresponding to the second priority is smaller, the clipping coefficient K2 of the second priority is 1.
As shown in fig. 5, if the clipping coefficient K2 of the second priority is calculated to be 1, the clipping coefficient of the third priority is calculated, that is, the rated output current I is calculatedoutSubtracting the squares of the effective values of the current components I1 and I2 corresponding to the first priority and the second priority in sequence from the square of the effective value of the current component I3578 corresponding to the second priority, comparing the obtained subtraction number with the square value of the effective value of the current component I3 corresponding to the third priority, and if the square value of the effective value of the current component I3 corresponding to the third priority is larger, dividing the subtraction number by the square of the effective value of the current component I3 corresponding to the third priority, and opening the root to obtain an amplitude limiting coefficient K3 of the third priority; otherwise the clipping coefficient K3 of the third priority stage is 1.
In this way, the current components are multiplied by the corresponding limiting coefficients to obtain the current component values to be compensated. And the electric energy quality treatment device treats the electric power system according to the current component value.
In the second embodiment of the present invention, through detection and analysis, if there is a power quality problem exceeding the national standard, the system determines the current component exceeding the national standard as the first priority, and determines the remaining two priority orders by referring to the foregoing.
After the priority is determined, the clipping coefficient is determined with reference to the foregoing, and then the countermeasure is performed.
In the third embodiment of the present invention, through detection and analysis, if there are two kinds of power quality problems exceeding the national standard, it is determined that the current components exceeding the national standard are equal in priority, and the priority of the remaining current components is the lowest, that is, the third priority.
As shown in FIG. 6, for two current components I1 and I2 of equal priority, the sum of the squares of the effective values thereof and the rated output current IoutIs compared with the square of the effective value, e.g.Greater than rated output current IoutSquared effective value of, the rated output current I is thenoutThe square of the effective value of (a) is divided by the square sum of the effective values of the current components I1 and I2 corresponding to the equal priority, and the root is opened to obtain the clipping coefficients K1 and K2 of the two equal priorities, wherein K1 and K2 are equal, and if the square of the effective value of the current component is smaller than the square of the rated output current, the clipping coefficients of the two equal priorities are both 1. The remaining method of calculating clipping coefficients for priority is as described above. And then, treating the power system according to the obtained current component value.
In the fourth embodiment of the invention, through detection and analysis, if three power quality problems exceed the national standard, the system judges that the three current components have equal priority.
As shown in FIG. 7, for the three current components I1, I2 and I3 of equal priority, the sum of the squares of their effective values and the rated output current I are summedoutIs compared with the square of the effective value of (e.g. greater than the rated output current I)outIs then the rated output current IoutThe square of the effective value of (2) is divided by the sum of the squares of the three equal current components, and the root cutting number obtains the clipping coefficients K1, K2 and K3 of the three equal priorities, wherein K1, K2 and K3 are all equal, such as smaller than the rated output current IoutThe clipping coefficients of all three equal priorities are all 1. And then, treating the power system according to the obtained current component value.
In another aspect, the present invention provides a power quality management apparatus comprising a memory and one or more processors implementing the above power compensation method.
In another aspect, the present invention also provides a computer-readable storage medium storing a computer program for use in conjunction with a computing device, the computer program being executable by a processor to implement the above-described power compensation method.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and these substitutions and modifications should be considered to fall within the scope of the invention.

Claims (10)

1. An electric energy compensation method of an electric energy quality treatment device is characterized by comprising the following steps:
s1, detecting the voltage and the current of the power system, and calculating the three-phase voltage unbalance, the voltage distortion rate and the system power factor according to an algorithm;
s2, comparing the three-phase voltage unbalance, the voltage distortion rate and the system power factor with respective specified values to obtain a compensated priority;
s3, detecting the load current of the power system, calculating current components, and respectively calculating harmonic current components I of the power systemhReactive current component ILNegative sequence current component InZero sequence current component I0The harmonic current component IhThe reactive current component ILThe negative-sequence current component InThe zero sequence current component I0With rated output current IoutHas a significant value ofout 2＝Ih 2+IL 2+In 2+I0 2；
S4, calculating the amplitude limiting coefficient of each current component according to the priority order;
s5, multiplying each current component by the corresponding amplitude limiting coefficient to obtain a current component value needing to be compensated;
and S6, compensating the power system according to the current component value.
2. The electric energy compensation method according to claim 1, wherein the S2 is specifically: and judging whether the three-phase voltage unbalance, the voltage distortion rate and the system power factor meet the three-phase unbalance of more than 2%, the voltage distortion rate of more than 5% and the system power factor of less than 0.85, if any one meets, judging the corresponding current components as a first priority, and if multiple meets, parallelly arranging the corresponding current components as equal priorities in an equal manner.
3. The power compensation method of claim 1, wherein: if the effective value of the current component corresponding to the first priority is larger than the effective value of the rated output current, calculating an amplitude limiting coefficient of the first priority, wherein the calculation method is that the effective value of the rated output current is divided by the effective value of the current component corresponding to the first priority; and if the effective value of the current component corresponding to the first priority is smaller than the effective value of the rated output current, the amplitude limiting coefficient of the first priority is 1.
4. The power compensation method of claim 1, wherein: on the premise that the amplitude limiting coefficient of the first priority is 1, if the square value of the current component corresponding to the second priority is larger than the difference value between the square of the effective value of the rated output current and the square value of the current component corresponding to the first priority, calculating the amplitude limiting coefficient of the second priority, wherein the calculation method is that the difference value between the square of the effective value of the rated output current and the square value of the current component corresponding to the first priority is divided by the square of the effective value of the current component corresponding to the second priority, and the root is opened to obtain the amplitude limiting coefficient of the second priority; and if the effective value of the current component corresponding to the second priority is smaller than the difference value between the square of the effective value of the rated output current and the square of the effective value of the current component corresponding to the first priority, the amplitude limiting coefficient of the second priority is 1.
5. The power compensation method of claim 1, wherein: on the premise that the amplitude limiting coefficient of the second priority is 1, if the square value of the effective value of the current component corresponding to the third priority is larger than the difference value obtained by subtracting the sum of squares of the effective values of the current components corresponding to the first and second priorities from the square value of the effective value of the rated output current, the amplitude limiting coefficient of the third priority is calculated by dividing the difference value of the square value of the effective value of the rated output current and the sum of squares of the effective values of the current components corresponding to the first and second priorities by the square value of the effective value of the current component corresponding to the third priority, and opening the root to obtain the amplitude limiting coefficient of the third priority; and if the square of the effective value of the current component corresponding to the third priority is smaller than the square of the effective value of the rated output current minus the square of the effective values of the current components corresponding to the first priority and the second priority, the amplitude limiting coefficient of the third priority is 1.
6. The power compensation method of claim 1, wherein: under the condition of equal priority, the square sum of the effective values of two or three equal current components is compared with the square value of the effective value of the rated current in magnitude, if the square sum of the effective values of the equal current components is larger, an equal amplitude limiting coefficient is calculated, and the calculation method is that the square sum of the effective values of the equal current components is divided by the square of the effective value of the rated output current, and the root is opened to obtain the amplitude limiting coefficient of the equal priority; if the sum of squares of the effective values of the equal current components is small, the clipping coefficient of the equal priority is 1.
7. The power compensation method according to any one of claims 1 to 6, wherein: the algorithm comprises a fast Fourier method, an instantaneous reactive power method and a symmetric component method.
8. The electric energy compensation method according to claim 1, wherein the three-phase voltage unbalance, the voltage distortion rate and the system power factor are respectively compensated by unbalance correction, harmonic suppression and reactive compensation, and the priorities include:
harmonic treatment > reactive compensation > unbalance correction;
harmonic treatment > unbalance correction > reactive compensation;
reactive compensation, harmonic treatment and unbalance correction;
reactive compensation, unbalance correction and harmonic treatment;
imbalance correction > reactive compensation > harmonic treatment;
imbalance correction, harmonic treatment and reactive compensation;
harmonic wave treatment, namely reactive compensation is larger than unbalance correction;
harmonic wave treatment, namely unbalance correction is greater than reactive compensation;
reactive compensation, namely unbalance correction, harmonic treatment;
harmonic control refers to reactive compensation and imbalance correction.
9. A power quality governance device comprising a memory and one or more processors, wherein said processors implement the power compensation method according to any one of claims 1 to 8.
10. A computer-readable storage medium storing a computer program for use in conjunction with a computing device, the computer program being executable by a processor to implement the power compensation method of any one of claims 1 to 8.
CN201811407456.4A 2018-11-23 2018-11-23 Electric energy quality treatment device and electric energy compensation method thereof Pending CN111224400A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112398126A (en) * 2020-11-26 2021-02-23 国网河南省电力公司内乡县供电公司 Power distribution grid loss reduction and anti-theft operation and maintenance management method
CN113346525A (en) * 2021-04-25 2021-09-03 西安交通大学 Power quality control cluster system at tail end of power distribution network and power quality control method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112398126A (en) * 2020-11-26 2021-02-23 国网河南省电力公司内乡县供电公司 Power distribution grid loss reduction and anti-theft operation and maintenance management method
CN113346525A (en) * 2021-04-25 2021-09-03 西安交通大学 Power quality control cluster system at tail end of power distribution network and power quality control method

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