CN112260295A - Three-phase outgoing line load power balance optimization method - Google Patents

Three-phase outgoing line load power balance optimization method Download PDF

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Publication number
CN112260295A
CN112260295A CN202011324577.XA CN202011324577A CN112260295A CN 112260295 A CN112260295 A CN 112260295A CN 202011324577 A CN202011324577 A CN 202011324577A CN 112260295 A CN112260295 A CN 112260295A
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phase
current
load
sequence current
unbalance
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蒋秀
闻建中
罗益荣
高垣
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Jiangmen Power Supply Bureau of Guangdong Power Grid Co Ltd
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Jiangmen Power Supply Bureau of Guangdong Power Grid Co Ltd
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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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • 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
    • Y02E40/50—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 relates to the technical field of electric power, in particular to a three-phase outgoing line load power balance optimization method, which comprises the following steps: s1: acquiring and analyzing operation data in a power grid system to obtain transformer information of three-phase unbalance; s2: load adjustment is carried out on the transformer with three unbalanced phases; s3: decoupling and decomposing three-phase unbalanced current based on a symmetrical component method, and controlling the three-phase unbalanced current; s4: and obtaining current components by a symmetrical component method to calculate three-phase command current and compensate three-phase load current and reactive power. The invention simultaneously realizes the compensation of three-phase unbalanced current and reactive power, and improves the optimization effect of a power grid system and the power supply quality of a power distribution network.

Description

Three-phase outgoing line load power balance optimization method
Technical Field
The invention relates to the technical field of electric power, in particular to a three-phase outgoing line load power balance optimization method.
Background
Three-phase unbalance in the power system is caused by three-phase load unbalance and three-phase parameter asymmetry of system elements, so that the condition of three-phase voltage balance in the power system is one of main indexes of power quality, the three-phase unbalance in a power grid can cause damage of connected equipment and a series of other problems, such as heating and vibration of a rotating motor, magnetic leakage increase and local overheating of a transformer, line loss increase of the power grid, misoperation of various protection and automatic devices and the like. In urban residents and rural power grid power supply systems, users mostly use single-phase and three-phase loads in a mixed mode, and the load size and the power utilization time are different, so that in the urban residents and rural power grid power supply systems, three-phase imbalance is not regular, and cannot be known in advance, and the long-term imbalance of the three-phase loads in the low-voltage power supply system is caused.
With the progress of power grid transformation engineering, the requirement on the power quality of a power distribution network is further improved, the problem of three-phase imbalance is solved at present, and the load of each phase of a low-voltage line is mainly distributed through manual adjustment, but the power load has randomness and uncertainty, so that the workload of an operator is too large, real-time online adjustment cannot be achieved, and the expected effect is difficult to achieve. In addition, the thyristor composite phase change switch can be used for regulation and distribution, so that huge workload of an operator can be saved, but voltage sag can occur during load regulation, and the thyristor composite phase change switch is not suitable for being used in a load sensitive area. At present, a method for achieving three-phase load balance distribution through establishing a mathematical model is also available, but due to the specificity of different power distribution networks, an algorithm and a scheme suitable for a certain power distribution network are not necessarily suitable for other power distribution network structures, and a user of the power distribution network can change power utilization habits according to conditions, while the established mathematical model cannot be changed in time to adapt to new three-phase imbalance, so that the method cannot be generally applied.
In order to solve the above technical problems, chinese patent CN111224400A discloses an electric energy quality management device and an electric energy compensation method thereof, which includes: 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 compensation 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. However, it only compensates the power system according to the current component, and does not directly optimize the current, which is not good.
Disclosure of Invention
The invention provides a three-phase outgoing line load power balance optimization method capable of effectively adjusting and compensating three-phase unbalanced current to overcome the defects in the prior art.
In the technical scheme, a three-phase outgoing line load power balance optimization method is provided, and the method comprises the following steps:
s1: acquiring and analyzing operation data in a power grid system to obtain transformer information of three-phase unbalance;
s2: load adjustment is carried out on the transformer with three unbalanced phases;
s3: decoupling and decomposing three-phase unbalanced current based on a symmetrical component method, and controlling the three-phase unbalanced current;
s4: and obtaining current components by a symmetrical component method to calculate three-phase command current and compensate three-phase load current and reactive power.
According to the scheme, the three-phase unbalanced current is controlled and optimized by a symmetrical component method, then the three-phase unbalanced current and reactive power are compensated, and meanwhile the three-phase unbalanced current of the power grid system is adjusted and the power factor and the voltage quality are improved.
Preferably, the step S1 of collecting and analyzing the operation data of the power grid system specifically includes the following steps:
s11: setting time span of information acquisition, and establishing a statistical rule of instantaneous unbalance and continuous unbalance;
s12: collecting three-phase voltage and current data of a power grid system and carrying out analysis and calculation according to statistical rules;
s13: and obtaining the information of the continuously unbalanced transformer.
Preferably, the load adjustment in step S2 includes the following steps:
s21: taking the monitoring current of the maximum load section in the monitoring system as a reference, and equally dividing the sum of the three-phase load current into three parts to obtain average current;
s22: the average current is subtracted from the three-phase load current, and if the result is positive, the current is adjusted to be small, and if the result is negative, the current is adjusted to be large.
Preferably, the step S3 is as follows:
s31: the asymmetric three-phase current phasor in the power grid system is decomposed into three-phase symmetric current components which are respectively a positive sequence component, a negative sequence component and a zero sequence component, and the specific formula is as follows:
Figure BDA0002793917730000031
wherein S is a symmetric component transformation matrix, a is a constant, Ia、Ib、IcAre respectively three-phase current phasors, Ia(+)、Ia(-)、Ia(0)Respectively a positive sequence component, a negative sequence component and a zero sequence component of the three-phase current;
s32: and respectively controlling the positive sequence current, the negative sequence current and the zero sequence current.
Preferably, in the step S32, the positive sequence voltage phase is obtained through a phase-locked loop, and the positive sequence voltage and the positive sequence current are controlled by using the positive sequence voltage phase. This can suppress the dc side capacitance current.
Preferably, in step S32, the negative-sequence current and the zero-sequence current control device controls the negative-sequence current and the zero-sequence current generated by the inverter to completely cancel the negative-sequence current and the zero-sequence current generated by the load, so that the components of the system except the positive-sequence current are all zero, and the specific formula is as follows:
Figure BDA0002793917730000032
Figure BDA0002793917730000033
wherein,
Figure BDA0002793917730000034
respectively a phase a, a phase b and a phase c negative sequence current generated by the load,
Figure BDA0002793917730000035
a, b, c phase zero sequence currents i generated for the load respectivelya(-)、ib(-)、ic(-)A, b, c phase negative sequence currents i generated by the inverter respectivelya(0)、ib(0)、ic(0)The phase zero-sequence currents are respectively generated by the inverter.
Preferably, the step S4 is as follows:
s41: and superposing the positive sequence current, the negative sequence current and the zero sequence current to obtain a three-phase command current, wherein a specific superposition calculation formula is as follows:
Figure BDA0002793917730000036
z＝ef·120°，
wherein, IaIs a zero sequence current, IbIs a positive sequence current, IcIs a negative sequence current, z is a rotation operator, Iu、Iv、IwThe three phases of command currents are respectively, e is a constant, and f is a wave peak value of a sinusoidal phasor;
s42: and generating compensation currents which have the same components and the same magnitudes as the positive sequence current components, the zero sequence current components and the negative sequence current components and are opposite in direction, inputting the compensation currents into a power grid system, and performing three-phase load current compensation and reactive power compensation.
Preferably, the compensation current in step S42 is generated by driving an insulated gate bipolar transistor with a trigger pulse generation signal.
Preferably, the time span in step S11 is one month; the statistical rule is that when the distribution transformer unbalance is more than fifty percent and the duration time exceeds three hours, the distribution transformer unbalance is counted as continuous unbalance.
Preferably, the persistent balun information obtained in step S1 includes a period in which the degree of unbalance of the transformer is the maximum, and the load adjustment period of step S2 is set to the period in which the degree of unbalance of the transformer is the maximum.
Compared with the prior art, the beneficial effects are:
according to the method, the three-phase unbalanced current is controlled and optimized by a symmetrical component method, then the three-phase unbalanced current and reactive power are compensated, and meanwhile, the three-phase unbalanced current of the power grid system is adjusted, and the power factor and the voltage quality are improved.
Drawings
Fig. 1 is a schematic flow chart of a three-phase outgoing line load power balance optimization method according to an embodiment of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
examples
Fig. 1 shows an embodiment of a method for optimizing load power balance of a three-phase outgoing line, which includes the following steps:
s1: acquiring and analyzing operation data in a power grid system to obtain transformer information of three-phase unbalance;
s2: load adjustment is carried out on the transformer with three unbalanced phases;
s3: decoupling and decomposing three-phase unbalanced current based on a symmetrical component method, and controlling the three-phase unbalanced current;
s4: and obtaining current components by a symmetrical component method to calculate three-phase command current and compensate three-phase load current and reactive power.
The step S1 of the present embodiment of collecting and analyzing the operation data of the power grid system specifically includes the following steps:
s11: setting time span of information acquisition, and establishing a statistical rule of instantaneous unbalance and continuous unbalance;
s12: collecting three-phase voltage and current data of a power grid system and carrying out analysis and calculation according to statistical rules;
s13: and obtaining the information of the continuously unbalanced transformer.
The specific steps of load adjustment in step S2 in this embodiment are as follows:
s21: taking the monitoring current of the maximum load section in the monitoring system as a reference, and equally dividing the sum of the three-phase load current into three parts to obtain average current;
s22: the average current is subtracted from the three-phase load current, and if the result is positive, the current is adjusted to be small, and if the result is negative, the current is adjusted to be large.
The step S3 in this embodiment specifically includes the following steps:
s31: the asymmetric three-phase current phasor in the power grid system is decomposed into three-phase symmetric current components which are respectively a positive sequence component, a negative sequence component and a zero sequence component, and the specific formula is as follows:
Figure BDA0002793917730000051
wherein S is a symmetric component transformation matrix, a is a constant, Ia、Ib、IcAre respectively three-phase current phasors, Ia(+)、Ia(-)、Ia(0)Respectively a positive sequence component, a negative sequence component and a zero sequence component of the three-phase current;
s32: and respectively controlling the positive sequence current, the negative sequence current and the zero sequence current.
In step S32 in this embodiment, the positive sequence voltage phase is obtained by the phase-locked loop, and then the positive sequence voltage phase is used to control the positive sequence voltage and the positive sequence current. This can suppress the dc side capacitance current.
In step S32, the negative sequence current and the zero sequence current generated by the inverter are controlled to completely cancel the negative sequence current and the zero sequence current generated by the load, so that the components of the system except the positive sequence current are all zero, and the specific formula is as follows:
Figure BDA0002793917730000061
Figure BDA0002793917730000062
wherein,
Figure BDA0002793917730000063
respectively a phase a, a phase b and a phase c negative sequence current generated by the load,
Figure BDA0002793917730000064
a, b, c phase zero sequence currents i generated for the load respectivelya(-)、ib(-)、ic(-)A, b, c phase negative sequence currents i generated by the inverter respectivelya(0)、ib(0)、ic(0)The phase zero-sequence currents are respectively generated by the inverter.
The step S4 in this embodiment specifically includes the following steps:
s41: and superposing the positive sequence current, the negative sequence current and the zero sequence current to obtain a three-phase command current, wherein a specific superposition calculation formula is as follows:
Figure BDA0002793917730000065
z＝ef·120°，
wherein, IaIs a zero sequence current, IbIs a positive sequence current, IcIs a negative sequence current, z is a rotation operator, Iu、Iv、IwThe three phases of command currents are respectively, e is a constant, and f is a wave peak value of a sinusoidal phasor;
s42: and generating compensation currents which have the same components and the same magnitudes as the positive sequence current components, the zero sequence current components and the negative sequence current components and are opposite in direction, inputting the compensation currents into a power grid system, and performing three-phase load current compensation and reactive power compensation.
In step S42 in this embodiment, the compensation current is generated by driving the igbt with the trigger pulse generation signal.
Wherein the time span in step S11 is one month; the statistical rule is that when the distribution transformer unbalance is more than fifty percent and the duration time exceeds three hours, the distribution transformer unbalance is counted as continuous unbalance.
In addition, the persistent balun information obtained in step S1 includes a period in which the degree of unbalance of the transformer is the maximum, and the load adjustment period is set to the period in which the degree of unbalance of the transformer is the maximum in step S2.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A three-phase outgoing line load power balance optimization method is characterized by comprising the following steps:
s1: acquiring and analyzing operation data of a power grid system to obtain transformer information of three-phase unbalance;
s2: load adjustment is carried out on the transformer with three unbalanced phases;
s3: decoupling and decomposing three-phase unbalanced current based on a symmetrical component method, and controlling the three-phase unbalanced current;
s4: and calculating three-phase command current through current components obtained by a symmetrical component method, and compensating three-phase load current and reactive power.
2. The three-phase outgoing line load power balance optimization method according to claim 1, wherein the step S1 of collecting and analyzing the operation data of the power grid system specifically includes the steps of:
s11: setting time span of information acquisition, and establishing a statistical rule of instantaneous unbalance and continuous unbalance;
s12: collecting three-phase voltage and current data of a power grid system and carrying out analysis and calculation according to statistical rules;
s13: and obtaining the information of the continuously unbalanced transformer.
3. The three-phase outgoing line load power balance optimization method according to claim 2, wherein the load adjustment in the step S2 specifically includes the following steps:
s21: taking the monitoring current of the maximum load section in the monitoring system as a reference, and equally dividing the sum of the three-phase load currents into three parts to obtain an average current;
s22: the average current is subtracted from the three-phase load current, and if the result is positive, the current is adjusted to be small, and if the result is negative, the current is adjusted to be large.
4. The three-phase outgoing line load power balance optimization method according to claim 3, wherein the step S3 specifically comprises the following steps:
s31: the asymmetric three-phase current phasor in the power grid system is decomposed into three-phase symmetric current components which are respectively a positive sequence component, a negative sequence component and a zero sequence component, and the specific formula is as follows:
Figure FDA0002793917720000011
wherein S is a symmetric component transformation matrix, a is a constant, Ia、Ib、IcAre respectively three-phase current phasors, Ia(+)、Ia(-)、Ia(0)Respectively a positive sequence component, a negative sequence component and a zero sequence component of the three-phase current;
s32: and respectively controlling the positive sequence current, the negative sequence current and the zero sequence current.
5. The method as claimed in claim 4, wherein in step S32, the positive sequence voltage phase is obtained by a phase locked loop, and the positive sequence voltage phase is used to control the positive sequence voltage and the positive sequence current.
6. The method of claim 4, wherein the negative sequence current and the zero sequence current control in step S32 completely cancel the negative sequence current and the zero sequence current generated by the load through the negative sequence current and the zero sequence current generated by the inverter, so that the other components except the positive sequence current in the system are all zero, and the specific formula is as follows:
Figure FDA0002793917720000021
Figure FDA0002793917720000022
wherein,
Figure FDA0002793917720000023
respectively a phase a, a phase b and a phase c negative sequence current generated by the load,
Figure FDA0002793917720000024
a, b, c phase zero sequence currents i generated for the load respectivelya(-)、ib(-)、ic(-)A, b, c phase negative sequence currents i generated by the inverter respectivelya(0)、ib(0)、ic(0)The phase zero-sequence currents are respectively generated by the inverter.
7. The three-phase outgoing line load power balance optimization method according to claim 6, wherein the step S4 specifically includes the following steps:
s41: and superposing the positive sequence current, the negative sequence current and the zero sequence current to obtain a three-phase command current, wherein a specific superposition calculation formula is as follows:
Figure FDA0002793917720000025
z＝ef·120°，
wherein, IaIs a zero sequence current, IbIs a positive sequence current, IcIs a negative sequence current, z is a rotation operator, Iu、Iv、IwThe three phases of command currents are respectively, e is a constant, and f is a wave peak value of a sinusoidal phasor;
s42: and generating compensation currents which have the same components and the same magnitudes as the positive sequence current components, the zero sequence current components and the negative sequence current components and are opposite in direction, inputting the compensation currents into a power grid system, and performing three-phase load current compensation and reactive power compensation.
8. The method for optimizing the power balance of the three-phase outgoing line load according to claim 7, wherein the compensation current in step S42 is generated by driving an insulated gate bipolar transistor with a trigger pulse generation signal.
9. The method for optimizing the power balance of the three-phase outgoing line load according to claim 2, wherein the time span in the step S11 is one month; the statistical rule is that when the distribution transformer unbalance is more than fifty percent and the duration time exceeds three hours, the distribution transformer unbalance is counted as continuous unbalance.
10. The method as claimed in claim 3, wherein the information of the persistent unbalance transformer obtained in step S1 includes a time period with the maximum degree of unbalance of the transformer, and the load adjustment time period of step S2 is set as the time period with the maximum degree of unbalance of the transformer.
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Application publication date: 20210122