CN114188958A - Power grid three-phase imbalance studying and judging method and system and distribution transformer terminal - Google Patents

Power grid three-phase imbalance studying and judging method and system and distribution transformer terminal Download PDF

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Publication number
CN114188958A
CN114188958A CN202111369801.1A CN202111369801A CN114188958A CN 114188958 A CN114188958 A CN 114188958A CN 202111369801 A CN202111369801 A CN 202111369801A CN 114188958 A CN114188958 A CN 114188958A
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power grid
phase
studying
unbalance
topology
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张季
曹俊岭
徐大可
彭宁宾
雍太利
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Nanjing Daqo Electrical Institute Co Ltd
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Nanjing Daqo Electrical Institute 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
    • H02J3/01—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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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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  • Power Engineering (AREA)
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Abstract

The invention discloses a method, a system and a distribution transformer terminal for studying and judging three-phase imbalance of a power grid, wherein the method comprises the following steps: acquiring real-time parameters of a load side power grid according to a pre-generated power grid topology; calculating the three-phase unbalance of the power grid according to the real-time parameters of the power grid at the load side; comparing the calculated three-phase unbalance of the power grid with the set three-phase allowable unbalance; and outputting a power grid three-phase unbalance studying and judging result according to the comparison result. The invention can timely study and judge the three-phase imbalance of the power grid, reduce unnecessary electric energy loss and equipment damage, improve the electric energy utilization rate and provide a safe and stable operation environment for the transformation and construction scheme of the power distribution network.

Description

Power grid three-phase imbalance studying and judging method and system and distribution transformer terminal
Technical Field
The invention relates to a method and a system for studying and judging three-phase imbalance of a power grid and a distribution transformer terminal, and belongs to the technical field of power systems.
Background
Three-phase imbalance is an important index of power quality, and although there are many factors affecting the power system, the normal imbalance is mostly caused by three-phase components, line parameters or load asymmetry. Because the factors of the three-phase load are not necessary, the three-phase voltage and current of the power supply point are easy to generate unbalanced phenomenon and lose the line. Moreover, it can adversely affect the motor at the point of supply, jeopardizing the proper functioning of the motor. Thus, if the three-phase imbalance exceeds the range that the distribution network can tolerate, safe operation of the overall power system may be compromised.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method, a system and a distribution transformer terminal for studying and judging three-phase imbalance of a power grid, which can study and judge the three-phase imbalance of the power grid in time and promote stable operation of a power system.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a method for studying and determining three-phase imbalance of a power grid, where the method includes:
acquiring real-time parameters of a load side power grid according to a pre-generated power grid topology;
calculating the three-phase unbalance of the power grid according to the real-time parameters of the power grid at the load side;
comparing the calculated three-phase unbalance of the power grid with the set three-phase allowable unbalance; and outputting a power grid three-phase unbalance studying and judging result according to the comparison result.
With reference to the first aspect, further, the real-time parameters of the power grid on the load side are acquired through an electric energy meter arranged on the load side.
With reference to the first aspect, further, the power grid topology is obtained from a primary topology file generated by identifying the power grid topology.
With reference to the first aspect, further, the three-phase allowable unbalance degree includes a three-phase allowable unbalance degree specified in GB/T15543-2008 "three-phase voltage allowable unbalance degree".
With reference to the first aspect, further, the method further includes: and when the three phases of the power grid are unbalanced, generating a corresponding fault analysis report and feeding the fault analysis report back to the main station, wherein the fault analysis report comprises a fault reason and a fault place.
In a second aspect, the present invention provides a distribution terminal, including:
an acquisition module: the system comprises a power grid, a load side power grid and a controller, wherein the power grid is used for acquiring real-time parameters of the load side power grid according to pre-generated power grid topology;
a cross-production module: the system is used for calculating the three-phase unbalance of the power grid according to the real-time parameters of the power grid at the load side;
a judging module: and the device is used for comparing the calculated three-phase unbalance degree of the power grid with the set three-phase allowable unbalance degree and outputting a power grid three-phase unbalance studying and judging result according to the comparison result.
With reference to the second aspect, further, the distribution terminal further includes:
a topology identification module: the method is used for identifying the power grid topology and generating a primary topology file.
In a third aspect, the present invention further provides a distribution terminal, which includes a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method of any of the first aspects.
In a fourth aspect, the invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of any one of the first aspect.
In a fifth aspect, the invention provides a power grid three-phase imbalance studying and judging system, which comprises a distribution transformer terminal, wherein the distribution transformer terminal is connected to a three-phase power grid inlet switch outlet terminal, and is provided with a topology identification module, a meter reading module, an alternate mining module and an studying and judging module;
the topology identification module is configured to identify the power grid topology and generate a primary topology file;
the meter reading module is configured to acquire power grid real-time parameters of the load side electric energy meter according to the power grid topology in the primary topology file;
the alternating current mining module is configured to calculate the three-phase unbalance degree of the power grid according to the real-time parameters of the power grid;
the studying and judging module is configured to compare the three-phase unbalance degree of the power grid obtained by the alternating-current acquisition module with the set three-phase allowable unbalance degree, and output a studying and judging result of the three-phase unbalance of the power grid according to the comparison result.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of collecting real-time parameters of a load-side power grid according to pre-generated power grid topology, calculating the three-phase unbalance of the power grid according to the real-time parameters of the load-side power grid, and comparing the calculated three-phase unbalance of the power grid with a set three-phase allowable unbalance; the power grid three-phase imbalance studying and judging result is output according to the comparison result, the three-phase imbalance of the power grid can be studied and judged in time, unnecessary electric energy loss is reduced, damage to equipment is reduced, the electric energy utilization rate is improved, and a safe and stable operation environment is provided for a power distribution network transformation construction scheme.
Drawings
Fig. 1 is a schematic diagram of a connection structure between a distribution terminal and a power grid according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
the embodiment of the invention provides a method for studying and judging three-phase imbalance of a power grid, which comprises the following steps:
the method comprises the following steps: acquiring real-time parameters of a load side power grid according to a pre-generated power grid topology;
in the embodiment of the invention, the power grid topology can be obtained by adopting pre-constructed topology automatic identification APP (injection type) identification, and a primary topology file is generated after the identification is finished. In the subsequent use process, the power grid topology can be directly read by calling the primary topology file.
The real-time parameters of the load-side power grid can be acquired through the electric energy meter arranged on the load side, and the real-time parameters of the load-side power grid, which can be acquired by different electric energy meters, are different and comprise values of power grid voltage (three-phase power grid phase voltage, three-phase power grid voltage frequency and three-phase power grid voltage distortion), power grid current (power grid-side three-phase current effective value, power grid-side power factor and power grid-side three-phase current distortion), load current (load-side three-phase current effective value, load-side power factor and load-side three-phase current distortion), apparent power, active power, reactive power and the like.
Step two: calculating the three-phase unbalance of the power grid according to the real-time parameters of the power grid at the load side;
in the embodiment of the invention, the main purpose of obtaining the real-time parameters of the power grid on the load side is to calculate the three-phase unbalance of the power grid, the current three-phase unbalance calculation comprises three-phase current unbalance calculation and three-phase voltage unbalance calculation, and common calculation formulas are respectively as follows:
the three-phase current unbalance calculation formula is as follows:
Figure DEST_PATH_IMAGE002
in the formula: PIUR is the three-phase current unbalance, Ia、Ib、IcEffective value of phase current, IPavgIs the three phase current average.
The three-phase voltage unbalance calculation formula is as follows:
Figure DEST_PATH_IMAGE004
in the formula: PVUR is three-phase voltage unbalance, Va、Vb、VcIs the effective value of the phase voltage, VPavgThe three phase voltage average value.
According to the calculation formula, if the three-phase voltage unbalance needs to be calculated, the collected real-time parameters of the load side power grid at least comprise numerical values of an A-phase voltage, a B-phase voltage and a C-phase voltage; if the three-phase current unbalance degree needs to be calculated, the collected real-time parameters of the load side power grid at least comprise numerical values of the phase A current, the phase B current and the phase C current.
Step three: and comparing the calculated three-phase unbalance degree of the power grid with the set three-phase allowable unbalance degree, and outputting a power grid three-phase unbalance studying and judging result according to the comparison result.
The three-phase allowable unbalance degrees comprise three-phase allowable unbalance degrees specified in GB/T15543-2008 three-phase voltage allowable unbalance degrees. GB/T15543-2008 'three-phase voltage allowable unbalance' stipulates that when a power grid normally operates, negative sequence voltage unbalance does not exceed 2%, and short time does not exceed 4%. Each user connected to the common connection point causes a negative sequence voltage imbalance tolerance of that point, typically 1.3%, and for short no more than 2.6%. Therefore, the actual condition of the electric energy can be intuitively reflected on a specific test item. There are test items we need to monitor: positive sequence voltage/current, negative sequence voltage/current, zero sequence voltage/current, and voltage current positive sequence imbalance, voltage current negative sequence imbalance, voltage current zero sequence imbalance.
Step four: and when the three phases of the power grid are unbalanced, generating a corresponding fault analysis report and feeding the fault analysis report back to the main station, wherein the fault analysis report comprises a fault reason and a fault place.
Several cases of causes of three-phase imbalance faults are analyzed as follows:
1. if one phase is disconnected but not grounded or one phase of the breaker is not connected, the fuse of the voltage transformer is fused, so that the three-phase parameters are asymmetric. When one phase of the line of the previous voltage level is disconnected, the voltage of the next voltage level is reduced in three phase voltages, wherein one phase is lower, the other two phases are higher, but the voltage values of the two phases are close. When the circuit of the current stage is disconnected, the voltage of the disconnected phase is zero, and the voltage of the non-disconnected phase is still the phase voltage. The phenomenon fault type is a disconnection fault.
2. When one phase of the line is disconnected and grounded in a single phase, although three-phase voltage imbalance is caused, the voltage value is not changed after the grounding. The single-phase ground is classified into metallic ground and non-metallic ground. The metallic grounding is adopted, the voltage of a fault phase is zero or close to zero, and the voltage of a non-fault phase is increased by 1.732 times and is permanently unchanged; the grounding is non-metallic, the grounding phase voltage is not zero but is reduced to a certain value, and the other two phases are increased by less than 1.732 times. The phenomenon fault type is a ground fault.
3. With the rapid development of industry, nonlinear power loads are greatly increased, and some loads not only generate harmonic waves, but also cause power supply voltage fluctuation and flicker, and even cause three-phase voltage unbalance. There are two types of three-phase voltage imbalance caused by resonance: (1) the fundamental frequency resonance is similar to single-phase grounding in characteristic, namely one phase voltage is reduced, the other two phase voltages are increased, a fault point is not easy to find when a fault reason is found, and a special user can be checked at the moment, if the fault reason is not the grounding reason, the fault point is probably caused by the resonance. (2) Fractional frequency resonance or high frequency resonance, characterized by a simultaneous rise in the three-phase voltage. In addition, it is also noted that when a cut-off part of the line of the air-drop bus or a single-phase earth fault disappears, if an earth signal occurs and the voltage of one phase, two phases or three phases exceeds the line voltage, the pointer of the voltmeter is struck to the head and moves slowly at the same time, or the voltage of the three phases rises in turn to exceed the line voltage, and the situation is generally caused by resonance.
4. When the power is connected, the fact that the three-phase load balance is controlled is not noticed, and the power charging of the circuit is carried out blindly and randomly, so that the three-phase load is unbalanced to a great extent. Secondly, most circuits in China are integrated by power and lighting, so that the power utilization efficiency is reduced when single-phase electric equipment is used, and the imbalance condition of three-phase loads of a distribution transformer is further aggravated by the difference. This is due to an unreasonable distribution of the three-phase load.
The method for studying and judging the three-phase imbalance of the power grid provided by the embodiment of the invention can study and judge the three-phase imbalance of the power grid in time, reduce unnecessary electric energy loss and equipment damage, improve the electric energy utilization rate and provide a safe and stable operation environment for a power distribution network reconstruction scheme. It should be noted that the above method steps can be implemented by one APP or a combination of multiple APPs.
Example two:
the invention provides a distribution terminal, which can be used for realizing the method steps of the first embodiment, and the distribution terminal comprises:
an acquisition module: the system comprises a power grid, a load side power grid and a controller, wherein the power grid is used for acquiring real-time parameters of the load side power grid according to pre-generated power grid topology;
a cross-production module: the system is used for calculating the three-phase unbalance of the power grid according to the real-time parameters of the power grid at the load side;
a judging module: and the device is used for comparing the calculated three-phase unbalance degree of the power grid with the set three-phase allowable unbalance degree and outputting a power grid three-phase unbalance studying and judging result according to the comparison result.
In order to facilitate identification of the grid topology, the distribution terminal further comprises: a topology identification module: the method is used for identifying the power grid topology and generating a primary topology file.
For details of each module to implement each method step, reference may be made to embodiment one, and since the technical concept same as that of embodiment one is adopted, the distribution terminal provided in the embodiment of the present invention can also produce the same technical effect as that of embodiment one, and details are not described herein.
Example three:
the invention also provides a distribution terminal which can be used for realizing the method steps of the first embodiment, and the distribution terminal comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method of any one of the embodiments.
The details of each method step can be seen in the first embodiment, and since the technical concept same as that of the first embodiment is adopted, the distribution terminal provided by the embodiment of the present invention can also produce the same technical effect as that of the first embodiment, and details are not described herein.
Example four:
the invention provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of the embodiments.
The details of each method step can be seen in the first embodiment, and since the technical concept same as that of the first embodiment is adopted, the computer-readable storage medium provided by the first embodiment of the present invention is applied to the distribution terminal, and the same technical effect as that of the first embodiment can also be produced, which is not described herein again.
Example five:
as shown in fig. 1, an embodiment of the present invention provides a power grid three-phase imbalance studying and judging system, including a distribution transformer terminal, where the distribution transformer terminal is connected to a three-phase power grid incoming line switch outgoing terminal, and the distribution transformer terminal is configured with a topology identification module, a meter reading module, an alternate mining module, and a studying and judging module;
the topology identification module is configured to identify the power grid topology and generate a primary topology file;
the meter reading module is configured to acquire power grid real-time parameters of the load side electric energy meter according to the power grid topology in the primary topology file;
the alternating current mining module is configured to calculate the three-phase unbalance degree of the power grid according to the real-time parameters of the power grid;
the studying and judging module is configured to compare the three-phase unbalance degree of the power grid obtained by the alternating-current acquisition module with the set three-phase allowable unbalance degree, and output a studying and judging result of the three-phase unbalance of the power grid according to the comparison result.
In the embodiment of the invention, the functions of the modules can be realized by combining one or more APPs, for example, the topology identification module can adopt a topology automatic identification APP (injection type), the meter reading module can adopt a tail end meter reading identification APP, the alternate mining module can adopt an alternate mining APP, and similarly, the research and judgment module can also adopt a corresponding APP. The details of the implementation of each method step by each module can be seen in the first embodiment, and since the technical concept same as that of the first embodiment is adopted, the power grid three-phase imbalance study and judgment system provided by the embodiment of the invention can also produce the same technical effect as that of the first embodiment, and the details are not repeated herein.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A method for judging three-phase imbalance of a power grid is characterized by comprising the following steps:
acquiring real-time parameters of a load side power grid according to a pre-generated power grid topology;
calculating the three-phase unbalance of the power grid according to the real-time parameters of the power grid at the load side;
comparing the calculated three-phase unbalance of the power grid with the set three-phase allowable unbalance; and outputting a power grid three-phase unbalance studying and judging result according to the comparison result.
2. The method for studying and judging the three-phase imbalance of the power grid according to claim 1, wherein the real-time parameters of the power grid on the load side are acquired through an electric energy meter arranged on the load side.
3. The method for studying and judging the three-phase imbalance of the power grid according to claim 1, wherein the power grid topology is obtained through a primary topology file generated by identifying the power grid topology.
4. The method for studying and judging the three-phase imbalance of the power grid according to claim 1, wherein the three-phase allowable imbalance degree comprises a three-phase allowable imbalance degree specified in GB/T15543-2008 "three-phase voltage allowable imbalance degree".
5. The method for studying and judging the three-phase imbalance of the power grid according to claim 1, further comprising: and when the three phases of the power grid are unbalanced, generating a corresponding fault analysis report and feeding the fault analysis report back to the main station, wherein the fault analysis report comprises a fault reason and a fault place.
6. A distribution terminal, comprising:
an acquisition module: the system comprises a power grid, a load side power grid and a controller, wherein the power grid is used for acquiring real-time parameters of the load side power grid according to pre-generated power grid topology;
a cross-production module: the system is used for calculating the three-phase unbalance of the power grid according to the real-time parameters of the power grid at the load side;
a judging module: and the device is used for comparing the calculated three-phase unbalance degree of the power grid with the set three-phase allowable unbalance degree and outputting a power grid three-phase unbalance studying and judging result according to the comparison result.
7. The distribution terminal of claim 6, further comprising:
a topology identification module: the method is used for identifying the power grid topology and generating a primary topology file.
8. A distribution terminal comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 5.
9. Computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the steps of the method of any one of claims 1 to 5.
10. A power grid three-phase unbalance studying and judging system is characterized by comprising a distribution transformer terminal, wherein the distribution transformer terminal is connected to a three-phase power grid inlet wire switch outlet terminal and is provided with a topology identification module, a meter reading module, an alternate mining module and an studying and judging module;
the topology identification module is configured to identify the power grid topology and generate a primary topology file;
the meter reading module is configured to acquire power grid real-time parameters of the load side electric energy meter according to the power grid topology in the primary topology file;
the alternating current mining module is configured to calculate the three-phase unbalance degree of the power grid according to the real-time parameters of the power grid;
the studying and judging module is configured to compare the three-phase unbalance degree of the power grid obtained by the alternating-current acquisition module with the set three-phase allowable unbalance degree, and output a studying and judging result of the three-phase unbalance of the power grid according to the comparison result.
CN202111369801.1A 2021-11-18 2021-11-18 Power grid three-phase imbalance studying and judging method and system and distribution transformer terminal Pending CN114188958A (en)

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CN109599891A (en) * 2018-11-15 2019-04-09 中国科学院电工研究所 The control method of photovoltaic power generation and power grid three-phase equilibrium
CN111463804A (en) * 2020-05-29 2020-07-28 国网湖南省电力有限公司 Method and system for adjusting three-phase unbalance of platform area load
CN112436530A (en) * 2020-12-01 2021-03-02 广东电网有限责任公司佛山供电局 Method for judging three-phase imbalance of feeder load at tail end of power distribution network

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120074779A1 (en) * 2010-09-29 2012-03-29 General Electric Company System and method for phase balancing in a power distribution system
CN105591396A (en) * 2016-02-29 2016-05-18 国家电网公司 Low-voltage distribution line distribution transformer three-phase unbalance protection method and device
CN107370165A (en) * 2017-08-01 2017-11-21 中国能源建设集团江苏省电力设计院有限公司 A kind of computational methods of photovoltaic plant access system design phase tri-phase unbalance factor
CN108120897A (en) * 2017-12-14 2018-06-05 国网安徽省电力有限公司蚌埠供电公司 A kind of distribution single-phase grounding selecting method based on three-phase current unbalance degree computation model
CN109599891A (en) * 2018-11-15 2019-04-09 中国科学院电工研究所 The control method of photovoltaic power generation and power grid three-phase equilibrium
CN111463804A (en) * 2020-05-29 2020-07-28 国网湖南省电力有限公司 Method and system for adjusting three-phase unbalance of platform area load
CN112436530A (en) * 2020-12-01 2021-03-02 广东电网有限责任公司佛山供电局 Method for judging three-phase imbalance of feeder load at tail end of power distribution network

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