CN113890067A - Three-phase unbalance treatment method based on combination of STATCOM and commutation switch - Google Patents

Three-phase unbalance treatment method based on combination of STATCOM and commutation switch Download PDF

Info

Publication number
CN113890067A
CN113890067A CN202111062620.4A CN202111062620A CN113890067A CN 113890067 A CN113890067 A CN 113890067A CN 202111062620 A CN202111062620 A CN 202111062620A CN 113890067 A CN113890067 A CN 113890067A
Authority
CN
China
Prior art keywords
phase
unbalance
epsilon
latching relay
magnetic latching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111062620.4A
Other languages
Chinese (zh)
Inventor
魏业文
陆洲杰
吴光源
吴希韬
李俊波
李烁
李威臻
叶峰
丁玉珏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Three Gorges University CTGU
Original Assignee
China Three Gorges University CTGU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Three Gorges University CTGU filed Critical China Three Gorges University CTGU
Priority to CN202111062620.4A priority Critical patent/CN113890067A/en
Publication of CN113890067A publication Critical patent/CN113890067A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Landscapes

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

Abstract

The three-phase unbalance management method based on the combination of the STATCOM and the commutation switch comprises the steps of firstly detecting voltage and current in a line and calculating the unbalance epsilon in the line in real time; when the problem of three-phase unbalance occurs in the line, the control center firstly transmits a control instruction to the commutation switch, when the commutation switch receives the control instruction, the commutation operation is carried out according to the optimal commutation strategy, the unbalance degree is calculated again after the operation is finished, and the treated three-phase current unbalance degree epsilon isx1With a threshold value epsilonnAnd a threshold value ε1Comparing; if epsilonn＜εx1＜ε1When the unbalance degree epsilon is treated, the phase-change switch is stopped to be used for treatment, the static synchronous compensator STATCOM is used for treatment, and the unbalance degree epsilon after treatment isx2＜εnWhen three phases are unevenAnd finishing the treatment of the balance. The method can reduce the three-phase unbalance degree as much as possible when the three-phase unbalance problem is treated, and has very important significance for ensuring the safe and stable operation of the power grid and improving the economic benefit of the power grid.

Description

Three-phase unbalance treatment method based on combination of STATCOM and commutation switch
Technical Field
The invention relates to the technical field of low-voltage distribution treatment, in particular to a three-phase imbalance treatment method based on the combination of a STATCOM and a phase change switch.
Background
At low voltage distribution station district, the unbalanced three-phase problem ubiquitous can lead to the net to decrease, transformer is exerted oneself and is reduced and consumer harms scheduling problem in the unbalanced three-phase can lead to in the circuit, seriously influences enterprise and resident's daily production life. At present, in some areas with underdeveloped economy, the treatment mode to unbalanced three-phase problem adopts artifical commutation or commutation switch to solve mostly, but it still has some problems: firstly, manual phase change needs to power off a distribution area before adjustment, and then a line with a large load is manually connected to a phase with a small load, so that approximate balance of three-phase load is realized. The method can cause power failure in a phase change area for a long time, and can cause great influence on an industrial area or a living area; secondly, compare in artifical commutation, adopt commutation switch can reduce the waste of manpower greatly, and also can not cause extensive power failure to the distribution station district, nevertheless commutation switch can cause the transient power failure at the commutation in-process, and this is not suitable for some special loads such as areas such as hospital, bank.
Disclosure of Invention
Aiming at the problem of three-phase imbalance of a power distribution network, three methods are commonly used: the commutation switch type three-phase load automatic adjusting device, the distribution network reconstruction and the power electronic type three-phase load automatic adjusting device have certain limitation when the problem of three-phase imbalance is solved independently. The invention provides a three-phase unbalance treatment method based on the combination of a STATCOM and a commutation switch, which adopts the combination of a STATCOM and an intelligent commutation switch; when the three-phase unbalance problem is solved, the three-phase unbalance can be reduced as much as possible instead of only meeting 2% of the national standard. The method has very important significance for ensuring the safe and stable operation of the power grid and improving the economic benefit of the power grid.
The technical scheme adopted by the invention is as follows:
a three-phase unbalance treatment method based on combination of a STATCOM and a commutation switch comprises the following steps:
the control center is respectively connected with the static synchronous compensator STATCOM and the commutation switch;
firstly, adjusting the unbalance degree through a phase change switch to enable the unbalance degree to reach a certain numerical value; then, the static synchronous compensator STATCOM is adopted to carry out fine adjustment on the unbalance degree so as to ensure that the unbalance degree reaches a value suitable for field practice.
A three-phase unbalance treatment method based on combination of a STATCOM and a commutation switch comprises the steps of firstly detecting voltage and current in a line and calculating the unbalance epsilon in the line in real time; when the problem of three-phase unbalance occurs in the line, the control center firstly transmits a control instruction to the commutation switch, when the commutation switch receives the control instruction, the commutation operation is carried out according to the optimal commutation strategy, the unbalance degree is calculated again after the operation is finished, and the treated three-phase current unbalance degree epsilon isx1With a threshold value epsilonnAnd a threshold value ε1Comparing; if epsilonn＜εx1＜ε1When the unbalance degree epsilon is treated, the phase-change switch is stopped to be used for treatment, the static synchronous compensator STATCOM is used for treatment, and the unbalance degree epsilon after treatment isx2＜εnAnd ending the treatment of the unbalance of the three phases.
The method specifically comprises the following steps:
step 1: detecting voltage and current in the line;
step 2: calculating the degree of unbalance epsilon in the line in real time;
and step 3: the unbalance degree epsilon obtained by the calculation in the step 2 and a set threshold value epsilonnComparing if ε < εnThen go directly to S10; if ε > εnThen go to step 4;
and 4, step 4: starting to control the phase-change switch if epsilon is more than epsilon1And 5, performing step 5;
and 5: the phase change switch carries out phase change once, and step 6 is carried out;
step 6: calculating the degree of unbalance epsilon after phase changex1And step 7 is carried out;
and 7: and epsilon1Making a comparison ifn＜εx1＜ε1When the control is finished, stopping using the phase change switch, and performing control by using a static synchronous compensator STATCOM (static synchronous compensator), and performing step 8; if epsilonx1＞ε1Continuing to step 5;
and 8: treating by adopting a static synchronous compensator STATCOM, and then performing step 9;
and step 9: calculating the degree of unbalance ε after compensationx2And step 10 is carried out;
step 10: the degree of unbalance ε after compensationx2And epsilonnMaking a comparison ifn＜εx2＜ε1Then go back to step 8, if εx2＜εnEntering step 11;
step 11: and finishing the treatment of the three-phase unbalance.
The invention relates to a three-phase unbalance treatment method, which has the following technical effects:
1) the invention can reduce the three-phase unbalance degree to the lowest degree according to different power quality requirements corresponding to different scenes so as to ensure the satisfaction degree of residents, factories and the like on the power quality.
2) The invention can greatly improve the safe and stable operation of the power grid, and can improve the economic benefit of the power grid for a long time although the investment in the early period has larger expenditure.
3) The three-phase imbalance treatment scheme is particularly suitable for areas with higher requirements on electric energy treatment, as shown in figure 1, the three-phase imbalance treatment scheme structurally comprises a STATCOM and an intelligent phase-change switch, and three-phase imbalance is more accurately treated in a mode of combining the STATCOM and the intelligent phase-change switch.
4) In order to achieve a more accurate management of the three-phase imbalance, as shown in fig. 2, the three-phase imbalance is firstly managed by the intelligent phase-change switch, and then the three-phase imbalance is accurately managed by the STATCOM, and several threshold values epsilon are set in the process, so that the imbalance degree is reduced as much as possible.
5) The main mode that solves the unbalanced three-phase problem of distribution network at present has three: the three modes are a commutation switch type three-phase load automatic adjusting device, a distribution network reconstruction and a power electronic type three-phase load automatic adjusting device, and have certain limitation when the three modes are used for independently solving the problem of three-phase imbalance. Therefore, the three-phase unbalance problem is comprehensively treated by combining the three-phase unbalance problem, the unbalance degree can be reduced to the minimum as far as possible, and the limitation caused by a single scheme can be reduced.
Drawings
FIG. 1 is a schematic diagram of the connection of components in the three-phase imbalance treatment method of the present invention.
FIG. 2 is a flow chart of the three-phase imbalance treatment method of the invention.
Fig. 3 is a flow chart of an optimal commutation strategy.
Detailed Description
A three-phase unbalance treatment method based on combination of a STATCOM and a phase change switch is mainly applied to a low-voltage distribution area, and the working principle of the method as shown in figure 1 comprises the following steps:
the control center is respectively connected with the static synchronous compensator STATCOM and the phase change switch.
The control center is a cloud platform, an edge computing gateway is adopted, and detected data are uploaded to a cloud terminal of a user through 4G, Wi-Fi and the like.
The static synchronous compensator STATCOM comprises the following units: the device comprises a power supply module, a DSP main control board, a signal sampling module, a signal conditioning module, a driving and protecting module, an upper computer and the like. The static synchronous compensator STATCOM is connected with a distribution area of the low-voltage distribution network. The static synchronous compensator STATCOM adopts closed-loop control in a low-voltage distribution network.
The phase change switch adopts an intelligent phase change switch with model number DZ 31-1244P 1S. The phase change switch is connected with a distribution box at the tail end of the low-voltage distribution network, and the phase change switch adopts closed-loop control in the low-voltage distribution network.
According to the three-phase unbalance treatment scheme, a STATCOM and a phase change switch are combined, when the three-phase unbalance problem is treated, the unbalance degree is adjusted through the phase change switch, so that the unbalance degree reaches a certain value, and the value is determined according to specific requirements. For example, in places with higher requirements on power quality by primary loads such as hospitals and banks, the three-phase unbalance degree should be reduced as much as possible, and compared with a tertiary load, the power quality of the primary load and the secondary load should be improved on the premise of meeting the requirements.
And then, the unbalance is finely adjusted through the STATCOM, so that the three-phase unbalance is reduced to the minimum as possible, the safe and stable operation of the power grid is ensured, and the economic benefit of the power grid is improved.
Fig. 2 is a flow chart of the STATCOM and the intelligent commutation switch for treating the three-phase imbalance. When the unbalance of three-phase current is over the threshold value epsilonnWhen e > enIn time, the equipment treats the problem of three-phase imbalance in the line;
if ε > ε1Then the commutation switch is adopted for treatment;
if epsilonn＜εx1＜ε1In time, STATCOM is used for treatment.
After the phase change switch is adopted for treatment, the treated three-phase current unbalance epsilonx1With a threshold value epsilonnAnd ε1By comparison, if εn＜εx1＜ε1When the treatment is finished, the phase-change switch is stopped; adopting STATCOM to treat the unbalance degree epsilon after treatmentx2＜εnAnd finishing the treatment of the unbalance of the three phases.
Example (b):
as shown in fig. 1, in the distribution substation, the STATCOM is combined with the intelligent commutation switch to solve the three-phase imbalance problem. The control center controls the STATCOM and the commutation switch through communication modes such as 4G/Wi-Fi and the like, in the treatment process, the three-phase unbalance is treated greatly through the intelligent commutation switch, and then the STATCOM is adopted to finely adjust the three-phase unbalance, so that the three-phase unbalance can reach a value suitable for field practice.
FIG. 2 is a flow chart of a three-phase imbalance treatment scheme: firstly, detecting voltage and current in a line through an intelligent circuit breaker, and calculating the unbalance epsilon in the line in real time at an edge calculation gateway; when the problem of three-phase unbalance occurs in the line, the control center firstly transmits a control instruction to the commutation switch, when the commutation switch receives the control instruction, the commutation operation is carried out according to the optimal commutation strategy, the unbalance degree is calculated again after the operation is finished, and the treated three-phase current unbalance degree epsilon isx1With a threshold value epsilonnAnd a threshold value ε1Comparing; if epsilonn＜εx1＜ε1When the unbalance degree epsilon is treated, the phase-change switch is stopped to be used for treatment, the static synchronous compensator STATCOM is used for treatment, and the unbalance degree epsilon after treatment isx2＜εnAnd ending the treatment of the unbalance of the three phases.
Threshold value epsilonnThe meaning of (1) is that whether the unbalance treatment is carried out or not is determined by calculating the unbalance degree epsilon and epsilon calculated by the voltage and current values detected in the linenMaking a comparison if ε < εnThen no unbalance treatment is needed, if epsilon > epsilonnImbalance management is required.
Threshold value epsilon1The meaning of the method is that whether the treatment is carried out by adopting a phase change switch or a load compensation mode is judged, if epsilon isn＜εx1＜ε1In the process, the method of load compensation is adopted to carry out unbalance treatment, if epsilon is more than epsilon1In time, the phase change switch is adopted to carry out unbalance treatmentAnd (6) processing.
The method specifically comprises the following steps:
step 1: detecting voltage and current in the line;
step 2: calculating the degree of unbalance epsilon in the line in real time;
and step 3: the unbalance degree epsilon obtained by the calculation in the step 2 and a set threshold value epsilonnComparing if ε < εnThen go directly to S10; if ε > εnThen go to step 4;
and 4, step 4: starting to control the phase-change switch if epsilon is more than epsilon1And 5, performing step 5;
and 5: the phase change switch carries out phase change once, and step 6 is carried out;
step 6: calculating the degree of unbalance epsilon after phase changex1And step 7 is carried out;
and 7: and epsilon1Making a comparison ifn＜εx1＜ε1When the control is finished, stopping using the phase change switch, and performing control by using a static synchronous compensator STATCOM (static synchronous compensator), and performing step 8; if epsilonx1＞ε1Continuing to step 5;
and 8: treating by adopting a static synchronous compensator STATCOM, and then performing step 9;
and step 9: calculating the degree of unbalance ε after compensationx2And step 10 is carried out;
step 10: the degree of unbalance ε after compensationx2And epsilonnMaking a comparison ifn＜εx2＜ε1Then go back to step 8, if εx2＜εnEntering step 11;
step 11: and finishing the treatment of the three-phase unbalance.
The optimal commutation strategy of the commutation switch is shown in fig. 3, and the control strategy can respectively realize positive sequence commutation and negative sequence commutation. The positive sequence phase change is that the phase A is changed into the phase B, the phase B is changed into the phase C, and the phase C is changed into the phase A; the negative sequence commutation is that B phase commutates to A phase, A phase commutates to C phase, and C phase commutates to B phase. In the phase commutation process, the optimal phase commutation strategy can ensure that the unbalance degree in the line is reduced in the fastest time, thereby reducing loss and ensuring the safe and stable operation of the power distribution network.
The optimal commutation strategy specifically comprises the following steps:
s1: initializing a phase change switch timer;
s2: judging whether the phase is changed, if so, performing S3; if not, go to S28;
s3: selecting how to change the phase, and if selecting the phase A to change to the phase B, performing S4; if the phase B is selected to be changed to the phase C, the process proceeds to S8; if the phase A is selected to be changed to the phase C, the process goes to S12; if phase C is selected to be changed to phase A, then S16 is carried out; if phase C is selected to be changed to phase B, then S20 is carried out; if phase B is selected to be changed to phase A, then S24 is carried out;
s4: switching on the A-phase thyristor and switching off the magnetic latching relay;
s5: closing a magnetic latching relay trigger signal and disconnecting the A-phase thyristor;
s6: switching on the B-phase thyristor and the magnetic latching relay;
s7: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s8: switching on the B-phase thyristor and switching off the magnetic latching relay;
s9: closing the trigger signal of the magnetic latching relay and disconnecting the phase B thyristor;
s10: connecting the C-phase thyristor and the magnetic latching relay;
s11: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s12: switching on the A-phase thyristor and switching off the magnetic latching relay;
s13: closing a magnetic latching relay trigger signal and disconnecting the A-phase thyristor;
s14: connecting the C-phase thyristor and the magnetic latching relay;
s15: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s16: switching on the C-phase thyristor and switching off the magnetic latching relay;
s17: closing the magnetic latching relay trigger signal and disconnecting the C-phase thyristor;
s18: connecting the A-phase thyristor and the magnetic latching relay;
s19: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s20: switching on the C-phase thyristor and switching off the magnetic latching relay;
s21: closing the magnetic latching relay trigger signal and disconnecting the C-phase thyristor;
s22: switching on the B-phase thyristor and the magnetic latching relay;
s23: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s24: switching on the C-phase thyristor and switching off the magnetic latching relay;
s25: closing the magnetic latching relay trigger signal and disconnecting the C-phase thyristor;
s26: switching on the B-phase thyristor and the magnetic latching relay;
s27: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s28: and finishing the phase change.

Claims (4)

1. A three-phase unbalance treatment method based on combination of a STATCOM and a commutation switch is characterized by comprising the following steps: the control center is respectively connected with the static synchronous compensator STATCOM and the commutation switch; firstly, adjusting the unbalance degree through a phase change switch to enable the unbalance degree to reach a certain numerical value; and then, the static synchronous compensator STATCOM is adopted to carry out fine adjustment on the unbalance degree so as to ensure that the unbalance degree reaches a value suitable for field practice.
2. A three-phase unbalance treatment method based on combination of a STATCOM and a commutation switch is characterized in that: firstly, detecting voltage and current in a line, and calculating the degree of unbalance epsilon in the line in real time; when the problem of three-phase unbalance occurs in the line, the control center firstly transmits a control instruction to the commutation switch, when the commutation switch receives the control instruction, the commutation operation is carried out according to the optimal commutation strategy, the unbalance degree is calculated again after the operation is finished, and the treated three-phase current unbalance degree epsilon isx1With a threshold value epsilonnAnd a threshold value ε1Comparing; if epsilonn＜εx1＜ε1When the unbalance degree epsilon is treated, the phase-change switch is stopped to be used for treatment, the static synchronous compensator STATCOM is used for treatment, and the unbalance degree epsilon after treatment isx2＜εnAnd ending the treatment of the unbalance of the three phases.
3. The three-phase imbalance management method based on the combination of the STATCOM and the phase change switch according to claim 2, wherein: the optimal commutation strategy specifically comprises the following steps:
s1: initializing a phase change switch timer;
s2: judging whether the phase is changed, if so, performing S3; if not, go to S28;
s3: selecting how to change the phase, and if selecting the phase A to change to the phase B, performing S4; if the phase B is selected to be changed to the phase C, the process proceeds to S8; if the phase A is selected to be changed to the phase C, the process goes to S12; if phase C is selected to be changed to phase A, then S16 is carried out; if phase C is selected to be changed to phase B, then S20 is carried out; if phase B is selected to be changed to phase A, then S24 is carried out;
s4: switching on the A-phase thyristor and switching off the magnetic latching relay;
s5: closing a magnetic latching relay trigger signal and disconnecting the A-phase thyristor;
s6: switching on the B-phase thyristor and the magnetic latching relay;
s7: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s8: switching on the B-phase thyristor and switching off the magnetic latching relay;
s9: closing the trigger signal of the magnetic latching relay and disconnecting the phase B thyristor;
s10: connecting the C-phase thyristor and the magnetic latching relay;
s11: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s12: switching on the A-phase thyristor and switching off the magnetic latching relay;
s13: closing a magnetic latching relay trigger signal and disconnecting the A-phase thyristor;
s14: connecting the C-phase thyristor and the magnetic latching relay;
s15: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s16: switching on the C-phase thyristor and switching off the magnetic latching relay;
s17: closing the magnetic latching relay trigger signal and disconnecting the C-phase thyristor;
s18: connecting the A-phase thyristor and the magnetic latching relay;
s19: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s20: switching on the C-phase thyristor and switching off the magnetic latching relay;
s21: closing the magnetic latching relay trigger signal and disconnecting the C-phase thyristor;
s22: switching on the B-phase thyristor and the magnetic latching relay;
s23: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s24: switching on the C-phase thyristor and switching off the magnetic latching relay;
s25: closing the magnetic latching relay trigger signal and disconnecting the C-phase thyristor;
s26: switching on the B-phase thyristor and the magnetic latching relay;
s27: closing the trigger signal of the magnetic latching relay, and simultaneously performing S28;
s28: and finishing the phase change.
4. A three-phase unbalance treatment method based on combination of a STATCOM and a commutation switch is characterized by comprising the following steps:
step 1: detecting voltage and current in the line;
step 2: calculating the degree of unbalance epsilon in the line in real time;
and step 3: the unbalance degree epsilon obtained by the calculation in the step 2 and a set threshold value epsilonnComparing if ε < εnThen go directly to S10; if ε > εnThen go to step 4;
and 4, step 4: starting to control the phase-change switch if epsilon is more than epsilon1And 5, performing step 5;
and 5: the phase change switch carries out phase change once, and step 6 is carried out;
step 6: calculating the degree of unbalance epsilon after phase changex1And step 7 is carried out;
and 7: and epsilon1Making a comparison ifn＜εx1＜ε1When the control is finished, stopping using the phase change switch, and performing control by using a static synchronous compensator STATCOM (static synchronous compensator), and performing step 8; if epsilonx1＞ε1Continuing to step 5;
and 8: treating by adopting a static synchronous compensator STATCOM, and then performing step 9;
and step 9: calculating the degree of unbalance ε after compensationx2And step 10 is carried out;
step 10: the degree of unbalance ε after compensationx2And epsilonnMaking a comparison ifn＜εx2＜ε1Then go back to step 8, if εx2＜εnEntering step 11;
step 11: and finishing the treatment of the three-phase unbalance.
CN202111062620.4A 2021-09-10 2021-09-10 Three-phase unbalance treatment method based on combination of STATCOM and commutation switch Pending CN113890067A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111062620.4A CN113890067A (en) 2021-09-10 2021-09-10 Three-phase unbalance treatment method based on combination of STATCOM and commutation switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111062620.4A CN113890067A (en) 2021-09-10 2021-09-10 Three-phase unbalance treatment method based on combination of STATCOM and commutation switch

Publications (1)

Publication Number Publication Date
CN113890067A true CN113890067A (en) 2022-01-04

Family

ID=79008866

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111062620.4A Pending CN113890067A (en) 2021-09-10 2021-09-10 Three-phase unbalance treatment method based on combination of STATCOM and commutation switch

Country Status (1)

Country Link
CN (1) CN113890067A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114884023A (en) * 2022-05-16 2022-08-09 三峡大学 Generator negative sequence protection method considering generator-end unbalanced negative sequence current suppression characteristic
CN114977224A (en) * 2022-05-06 2022-08-30 三峡大学 Three-phase unbalance time-sharing treatment method considering distributed power supply access residential area

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN208923836U (en) * 2018-09-14 2019-05-31 国网甘肃省电力公司武威供电公司 A kind of three-phase imbalance and reactive compensation self-checking device
CN110797887A (en) * 2019-09-23 2020-02-14 南京软核科技有限公司 Low-voltage transformer area three-phase unbalance management self-decision control method
CN113162075A (en) * 2021-04-16 2021-07-23 西安理工大学 Three-phase imbalance active treatment method and device based on matching of transformer area characteristics and commutation targets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN208923836U (en) * 2018-09-14 2019-05-31 国网甘肃省电力公司武威供电公司 A kind of three-phase imbalance and reactive compensation self-checking device
CN110797887A (en) * 2019-09-23 2020-02-14 南京软核科技有限公司 Low-voltage transformer area three-phase unbalance management self-decision control method
CN113162075A (en) * 2021-04-16 2021-07-23 西安理工大学 Three-phase imbalance active treatment method and device based on matching of transformer area characteristics and commutation targets

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
曹磊;王蕊;胡鹏飞;: "低压配电网三相负荷不平衡解决方法研究", 电器与能效管理技术, no. 16, pages 44 - 56 *
李永霞;龚宇雷;赵燕燕;郭修宵;: "三相不平衡预计算控制策略", 电力系统及其自动化学报, vol. 32, no. 03, pages 20 - 24 *
李永霞;龚宇雷;郭修宵;赵燕燕;: "配网三相不平衡调节的换相算法", 中国电力, vol. 53, no. 03, pages 52 - 58 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114977224A (en) * 2022-05-06 2022-08-30 三峡大学 Three-phase unbalance time-sharing treatment method considering distributed power supply access residential area
CN114977224B (en) * 2022-05-06 2024-04-19 三峡大学 Three-phase imbalance time-period treatment method considering distributed power supply access residential area
CN114884023A (en) * 2022-05-16 2022-08-09 三峡大学 Generator negative sequence protection method considering generator-end unbalanced negative sequence current suppression characteristic

Similar Documents

Publication Publication Date Title
CN107863778B (en) Commutation energy storage type three-phase load unbalance management device and method
CN113890067A (en) Three-phase unbalance treatment method based on combination of STATCOM and commutation switch
CN111463804A (en) Method and system for adjusting three-phase unbalance of platform area load
CN102121957A (en) Performance testing system of large-capacity reactive power dynamic compensating device
CN207442454U (en) Intelligent commutation device
CN110198026B (en) Impedance isolation type voltage sag management system and control method thereof
CN110994590A (en) Voltage sag treatment system based on light storage system and control method thereof
CN102664400B (en) Monitoring method for electric energy quality
CN110797887B (en) Low-voltage area three-phase imbalance treatment self-decision control method
CN110797899B (en) Direct current system with dynamic reactive power compensation device and control method thereof
CN112152237B (en) Transformer area power quality management method and system based on multi-DFACTS device coordination control
CN106058916B (en) A kind of passive based on the more microgrids of single three-phase grid-connected leaves net method for handover control
CN207368670U (en) A kind of power distribution station imbalance controlling device based on photovoltaic commutation technology
CN105244886A (en) Power distribution network high-voltage treatment system and method based on magnetic control type series reactor, and application
CN205283147U (en) Automatic commutation device of distribution network
CN106058915B (en) A kind of active based on the more microgrids of single three-phase is grid-connected to leave net method for handover control
CN204668954U (en) A kind of alternating voltage automatic regulating apparatus
CN207053186U (en) Power quality comprehensive treatment device
Xi et al. STATCOM control and operation with series connected transformer based 48-pulse VSC
CN110783936A (en) Distribution network three-phase load unbalance management method and system based on distributed photovoltaic
CN210111616U (en) Energy-saving three-phase active current full-automatic balancing circuit structure
CN201945650U (en) Performance test system for high-capacity reactive power dynamic compensating device
CN205666621U (en) Automatic voltage regulator
CN205195273U (en) Distribution network high voltage treatment system based on magnetic control formula series reactor
CN2583855Y (en) Fully automatic electric energy-saving device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination