CN106787785B - Based on the single-phase converting means of transformer electronic formula compensation three-phase and its compensation method - Google Patents
Based on the single-phase converting means of transformer electronic formula compensation three-phase and its compensation method Download PDFInfo
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- CN106787785B CN106787785B CN201710058937.8A CN201710058937A CN106787785B CN 106787785 B CN106787785 B CN 106787785B CN 201710058937 A CN201710058937 A CN 201710058937A CN 106787785 B CN106787785 B CN 106787785B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000009466 transformation Effects 0.000 claims abstract description 12
- 238000004804 winding Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 claims description 8
- 239000002023 wood Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 230000002411 adverse Effects 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses one kind based on the transformer electronic formula compensation single-phase converting means of three-phase, A, B, C phase of three phase network are connected with transformer primary side three winding respectively, two single-phase AC voltage ports, two electronic type compensation devices in parallel of transformer secondary output, two-port being exported for transformer secondary compensation electric current being provided, synthesize line voltage between single-phase AC voltage powers to single-phase load；Measurement module detection single-phase load currents in detection module, two phaselocked loops detect to two single-phase AC voltage phases respectively；Controller produces the conducting and shut-off of control signal control electronic type compensation device switching tube according to testing result.Present invention also offers a kind of compensation method based on the transformer electronic formula compensation single-phase converting means of three-phase.Beneficial effects of the present invention：Balanced transformation of the three-phase alternating current to single-phase alternating current can be realized, while meets that three-phase alternating current side input power factor height, three-phase alternating current side current-symmetrical, negative sequence component content are low.
Description
Technical field
The present invention relates to power supply power supply technique field, in particular to one kind based on transformer electronic formula compensation three-phase-
Single-phase converting means and its compensation method.
Background technology
It is well known that power system power supply is all to use three-phase alternating current system.But in the industry such as industry and transportation
Many large-power occasions in, it is also necessary to single-phase alternating current is used, such as electric welding machine, electric induction furnace, electric railway, city rail
The occasions such as traffic power supply.At present, existing technical scheme is using a secondary parallel connection in the single-phase transformer of three phase transformations
One capacitor realizes the conversion of three-phase-single-phase.Capacitor size in the program is designed according to the size of load,
It is relatively low and in the case of load fluctuation to there is three-phase input side power factor, the serious asymmetric, negative-sequence current point of three-phase current
Measure the shortcomings of content is big.
The content of the invention
To solve the above problems, it is an object of the invention to provide one kind can realize three-phase alternating current side input power factor
Height, three-phase alternating current side current-symmetrical, negative-sequence current component content are low, in the case of load fluctuation still with ideal effect three-phase-
Single-phase converting means and its compensation method.
The invention provides one kind based on transformer electronic formula compensation three-phase-single-phase converting means, the device include three-phase-
Two phase transformers, electronic type compensation device I, electronic type compensation device II, load, controller and detection module；
The A phase, B phase, C phase of three phase network is connected with three windings of the three-phase-two-phase transformer primary side respectively, described
Two single-phase AC voltage u of three-phase-two-phase transformer secondary outputαAnd uβThe port in parallel electronic type compensation dress respectively
Put I and the electronic type compensation device II, single-phase AC voltage uαAnd uβBetween the line voltage that synthesizes be unidirectional voltage source uαβ, institute
State unidirectional voltage source uαβPowered to single-phase load L, the electronic type compensation device I and the electronic type compensation device II are respectively
Two ports of the three-phase-two-phase transformer secondary output provide compensation electric current ic1And ic2；
Detection module includes measurement module and two phaselocked loops, and the measurement module detects the electric current of the single-phase load L
iL, two phaselocked loops are respectively to two single-phase AC voltage u of the three-phase-two-phase transformer secondary outputαAnd uβPhase enter
Row detection；
The result that controller detects according to the detection module, produce control signal and control the electronic type compensation device I
With the conducting and shut-off of the switching tube of electronic type compensation device II；
Wherein, the phase transformer of three-phase-two is balancing transformer or balun transformer；
When the phase transformer of three-phase-two is balancing transformer, two single-phase AC voltages are respectively uαAnd uβ, two
It is described after 90 ° of voltage-phase difference, the electronic type compensation device I and the electronic type compensation device II provide compensation electric current
The electric current i ' of the phase transformer of three-phase-two both ends output portαWith i 'βSymmetrically, and i 'αWith i 'βPhase differ 90 °；
When the phase transformer of three-phase-two is balun transformer, two single-phase AC voltages are respectively uαAnd uβ, two
Individual voltage-phase differs 60 °, after the electronic type compensation device I and the electronic type compensation device II provide compensation electric current, institute
State the electric current i ' of the phase transformer of three-phase-two both ends output portαWith i 'βSymmetrically, and i 'αWith i 'βPhase differ 120 °.
As further improvement of the invention, the electronic type compensation device I or the electronic type compensation device II are two
The converter of level converter or multi-level converter or H bridge cascade forms.
As further improvement of the invention, the single-phase load L is purely resistive or resistance sense or resistance capacitive load.
Improved as of the invention further, the phase transformer of three-phase-two be V/v transformers or Scott transformers or
Balanced impedance matching transformer or YN/D transformers or YNVD transformers or Wood bridging depressor or Multi-Function Balancing Transformer.
Present invention also offers it is a kind of based on transformer electronic formula compensation three-phase-single-phase converting means compensation method, three
Two single-phase AC voltages of phase-two-phase transformer secondary output are respectively uαAnd uβ, line voltage uαβPowered to single-phase load,
Do not put into before electronic type compensation device, the electric current of two vice-side winding outputs of the phase transformer of three-phase-two is respectively iα=iL、iβ
=-iL, after adding electronic type compensation device I and electronic type compensation device II, by controller to electronic type compensation device I and electricity
Minor compensation device II is controlled so that the electric current of electronic type compensation device I is ic1, the electric current of electronic type compensation device II is
ic2, now, the electric current of the phase transformer of three-phase-two both ends output port is respectively i 'α=iL+ic1、i′β=-iL+ic2, meet i 'α
=ji 'β, according to the transformation relation of three-phase-two-phase transformer primary secondary current, in the three-phase electricity of three-phase-two-phase transformer primary side
In the case of stream is symmetrical, input power factor 1, negative-sequence current component zero, realize three-phase alternating current to single-phase alternating current
Balanced transformation.
As further improvement of the invention, when the phase transformer of three-phase-two uses balancing transformer, two blow-ups
It is respectively u to flow voltageαAnd uβ, 90 ° of the phase difference of two voltage.
Further improved as of the invention, when the phase transformer of three-phase-two uses balancing transformer, after compensation, institute
State the electric current i ' of the phase transformer of three-phase-two both ends output portαWith i 'βSymmetrically, and i 'αWith i 'βPhase differ 90 °.
As further improvement of the invention, when the phase transformer of three-phase-two uses balun transformer, two single-phase
Alternating voltage is respectively uαAnd uβ, 60 ° of the phase difference of two voltage.
Further improved as of the invention, when the phase transformer of three-phase-two uses balun transformer, after compensation,
The phase transformer of three-phase-two both ends output port electric current i 'αWith i 'βSymmetrically, and i 'αWith i 'βPhase differ 120 °.
Beneficial effects of the present invention are：
Balanced transformation of the three-phase alternating current to single-phase alternating current can be realized, at the same meet three-phase alternating current side input power because
Number height, three-phase alternating current side current-symmetrical, negative sequence component content are low, overcome the existing high-power single-phase Load on Electric Power Grid quality of power supply
A series of caused adverse effects.
Brief description of the drawings
Fig. 1 is a kind of showing based on transformer electronic formula compensation three-phase-single-phase converting means described in the embodiment of the present invention
It is intended to；
Fig. 2 uses main circuit connection schematic diagram during Scott transformers for the phase transformer of three-phase-two in Fig. 1；
The vectorial schematic diagram that it is compensation principle when using balancing transformer that Fig. 3, which is,；
Fig. 4 uses main circuit connection schematic diagram during V/v transformers for the phase transformer of three-phase-two in Fig. 1；
Fig. 5 is the vectorial schematic diagram using compensation principle during balun transformer；
Fig. 6 is circuit diagram when electronic type compensation device uses two level blocks；
Fig. 7 is circuit diagram when electronic type compensation device uses H bridge cascade structures.
Embodiment
The present invention is described in further detail below by specific embodiment and with reference to accompanying drawing.
Embodiment 1, as shown in figure 1, one kind of first embodiment of the invention is based on transformer electronic formula compensation three-phase-single-phase
Converting means, the device include the phase transformer of three-phase-two, electronic type compensation device I, electronic type compensation device II, load, control
Device and detection module.Wherein, the phase transformer of three-phase-two uses Scott transformers, and single-phase load L is ohmic load.
The A phase, B phase, C phase of three phase network is connected with three windings of Scott transformer primary sides respectively, Scott transformers
Two single-phase AC voltage u of secondary outputαAnd uβPort distinguish electronic type compensation device I in parallel and electronic type compensation device
II, single-phase AC voltage uαAnd uβBetween the line voltage that synthesizes be unidirectional voltage source uαβ, unidirectional voltage source uαβSupplied to single-phase load L
Electricity, according to the voltage class u needed for loadαβCome the former secondary turn ratio of Design of Transformer, electronic type compensation device I and electronic type
Compensation device II is respectively that two ports of Scott transformer secondaries output provide compensation electric current.Detection module includes measurement mould
Block and two phaselocked loops, measurement module detection single-phase load L electric current iL, two phaselocked loops are respectively to Scott transformer secondaries
Two single-phase AC voltage u of outputαThe u of sumβPhase is detected.The result that controller detects according to detection module, produce control
The conducting and shut-off of signal control electronic type compensation device I processed and the switching tube of electronic type compensation device II.Measurement module is using electricity
Flow sensor, in order to which electronic type compensation device can dynamically follow the change of load.
As shown in Figures 2 and 3, two single-phase AC voltages of Scott transformer secondaries output are respectively uαAnd uβ, two
The phase of voltage differs 90 °, line voltage uαβGive single-phase resistance load supplying.Before electronic type compensation device is not put into, Scott
The electric current of two vice-side winding outputs of transformer is respectively iα=iL、iβ=-iL, the electric current of transformer primary side in this case
Serious asymmetric, transformer primary avris negative-sequence current component content is big, and power factor is relatively low.Add electronic type compensation device I
After electronic type compensation device II, electronic type compensation device I and electronic type compensation device II are controlled by controller, made
The electric current for obtaining electronic type compensation device I is ic1, the electric current of electronic type compensation device II is ic2, now, Scott transformers both ends
The electric current of output port is respectively iα=iL+ic1、iβ=-iL+ic2.It can see by Fig. 3 vectogram, now, Scott transformations
The current-symmetrical of device both ends output port, that is, meet i 'α=ji 'β, and i 'αWith iβPhase differ 90 °.Therefore, in this feelings
It is symmetrical in the three-phase current of Scott transformer primary sides it can be seen from the transformation relation of Scott transformer primary secondary currents under condition
Ideally, input power factor 1, negative-sequence current component zero.
For other balancing transformers, such as balanced impedance matching transformer, YNVD transformers, Wood bridging depressor, more work(
Energy balancing transformer etc. can be compensated using above-mentioned compensation principle.
The electronic type compensation device I or the electronic type compensation device II are two level converters or multi-level converter
Or the converter of H bridge cascade forms.As shown in fig. 6, use two level for electronic type compensation device I and electronic type compensation device II
Circuit diagram during structure, as shown in fig. 7, when using H bridge cascade structures for electronic type compensation device I and electronic type compensation device II
Circuit diagram.
Embodiment 2, as shown in Figure 4 and Figure 5, difference from Example 1 is, the phase transformer of three-phase-two is become using V/v
Depressor.Two single-phase AC voltages of V/v transformer secondaries output are respectively uαAnd uβ, 60 ° of the phase difference of two voltage, line
Voltage uαβGive single-phase resistance load supplying.Before electronic type compensation device is not put into, the two vice-side winding outputs of V/v transformers
Electric current be respectively iα=iL、iβ=-iL, the electric current of transformer primary side is seriously asymmetric in this case, transformer primary avris
Negative-sequence current component content is big, and power factor is relatively low.After adding electronic type compensation device I and electronic type compensation device II, lead to
Cross the control of controller so that the electric current of electronic type compensation device I is ic1, the electric current of electronic type compensation device II is ic2, this
When, the electric current of V/v transformers both ends output port is respectively i 'α=iL+ic1、i′β=-iL+ic2.It can be seen by Fig. 5 vectogram
Arrive, now, the current-symmetrical of V/v transformers both ends output port, that is, meet i 'α=i 'β, and i 'αWith i 'βPhase difference
120°.Therefore, in this case, it can be seen from the transformation relation of V/v transformer primary secondary currents, in V/v transformer primary sides
Three-phase current it is symmetrical, ideally, input power factor 1, negative-sequence current component zero.
For other balun transformers, such as YN/D transformers can be compensated using above-mentioned compensation principle.
Transformer electronic formula provided by the invention compensates three-phase-single-phase converting means, the interface point of transformer primary side winding
It is not connected with A, B, C three-phase of three phase network, two voltages of secondary output are respectively uαAnd uβ, by uαAnd uβThe line electricity of synthesis
Press uαβPowering load.According to the voltage class u needed for loadαβCome the former secondary turn ratio of Design of Transformer, secondary output electricity
Press uαPort parallel connection electronic type compensation device I, secondary output voltage uβPort parallel connection electronic type compensation device II.The present invention
A current sensor is needed to detect the electric current of load, in order to which electronic type compensation device can dynamically follow the change of load
Change.The present invention also needs to the voltage u that two phaselocked loops (PLL) to export transformer secondaryα、uβPhase detected.Finally
In digitial controller by simply calculate produce corresponding signal control the conducting of electronic type compensation device switching tube with
Shut-off, so as to reach the purpose of dynamic compensation.After carrying out adequate compensation, in the case of the fluctuation of load, it can also realize
Three-phase alternating current side input power factor is high, three-phase alternating current side input current is symmetrical, negative sequence component content is low.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (9)
1. one kind is based on transformer electronic formula compensation three-phase-single-phase converting means, it is characterised in that the device includes three-phase-two
Phase transformer, electronic type compensation device I, electronic type compensation device II, load, controller and detection module；
The A phase, B phase, C phase of three phase network is connected with three windings of the three-phase-two-phase transformer primary side respectively, and described three
Two single-phase AC voltage u of phase-two-phase transformer secondary outputαAnd uβThe port in parallel electronic type compensation device I respectively
With the electronic type compensation device II, single-phase AC voltage uαAnd uβBetween the line voltage that synthesizes be unidirectional voltage source uαβ, it is described
Unidirectional voltage source uαβPowered to single-phase load L, the electronic type compensation device I and the electronic type compensation device II are respectively institute
Two ports for stating three-phase-two-phase transformer secondary output provide compensation electric current ic1And ic2；
Detection module includes measurement module and two phaselocked loops, and the measurement module detects the electric current i of the single-phase load LL, two
Individual phaselocked loop is respectively to two single-phase AC voltage u of the three-phase-two-phase transformer secondary outputαAnd uβPhase examined
Survey；
The result that controller detects according to the detection module, produce control signal and control the electronic type compensation device I and institute
State the conducting and shut-off of the switching tube of electronic type compensation device II；
Wherein, the phase transformer of three-phase-two is balancing transformer or balun transformer；
When the phase transformer of three-phase-two is balancing transformer, two single-phase AC voltages are respectively uαAnd uβ, two voltages
Phase differ 90 °, after the electronic type compensation device I and the electronic type compensation device II provide compensation electric current, described three
The electric current i ' of the phase transformer of phase-two both ends output portαWith i 'βSymmetrically, and i 'αWith i 'βPhase differ 90 °；
When the phase transformer of three-phase-two is balun transformer, two single-phase AC voltages are respectively uαAnd uβ, two electricity
It is described after 60 ° of the phase difference of pressure, the electronic type compensation device I and the electronic type compensation device II provide compensation electric current
The electric current i ' of the phase transformer of three-phase-two both ends output portαWith i 'βSymmetrically, and i 'αWith i 'βPhase differ 120 °.
It is 2. according to claim 1 based on transformer electronic formula compensation three-phase-single-phase converting means, it is characterised in that institute
It is two level converters or multi-level converter or the cascade of H bridges to state electronic type compensation device I or the electronic type compensation device II
The converter of form.
It is 3. according to claim 1 based on transformer electronic formula compensation three-phase-single-phase converting means, it is characterised in that institute
Single-phase load L is stated as purely resistive or resistance sense or resistance capacitive load.
It is 4. according to claim 1 based on transformer electronic formula compensation three-phase-single-phase converting means, it is characterised in that institute
State the phase transformer of three-phase-two for V/v transformers or Scott transformers or balanced impedance matching transformer or YN/D transformers or
YNVD transformers or Wood bridging depressor or Multi-Function Balancing Transformer.
A kind of 5. compensation method based on transformer electronic formula compensation three-phase-single-phase converting means, it is characterised in that three-phase-two
Two single-phase AC voltages of phase transformer secondary output are respectively uαAnd uβ, line voltage uαβPower to single-phase load, do not throwing
Before entering electronic type compensation device, the electric current of two vice-side winding outputs of the phase transformer of three-phase-two is respectively iα=iL、iβ=-
iL, after adding electronic type compensation device I and electronic type compensation device II, by controller to electronic type compensation device I and electronics
Formula compensation device II is controlled so that the electric current of electronic type compensation device I is ic1, the electric current of electronic type compensation device II is
ic2, now, the electric current of the phase transformer of three-phase-two both ends output port is respectively i'α=iL+ic1、i'β=-iL+ic2, meet i'α
=ji'β, according to the transformation relation of three-phase-two-phase transformer primary secondary current, in the three-phase electricity of three-phase-two-phase transformer primary side
In the case of stream is symmetrical, input power factor 1, negative-sequence current component zero, realize three-phase alternating current to single-phase alternating current
Balanced transformation.
6. compensation method according to claim 5, it is characterised in that the phase transformer of three-phase-two is using balance transformation
During device, two single-phase AC voltages are respectively uαAnd uβ, 90 ° of the phase difference of two voltage.
7. compensation method according to claim 5, it is characterised in that the phase transformer of three-phase-two is using balance transformation
During device, after compensation, the electric current i ' of the phase transformer of three-phase-two both ends output portαWith i 'βSymmetrically, and i 'αWith i 'βPhase
90 ° of difference.
8. compensation method according to claim 5, it is characterised in that the phase transformer of three-phase-two uses non-equilibrium change
During depressor, two single-phase AC voltages are respectively uαAnd uβ, 60 ° of the phase difference of two voltage.
9. compensation method according to claim 5, it is characterised in that the phase transformer of three-phase-two uses non-equilibrium change
During depressor, after compensation, the phase transformer of three-phase-two both ends output port electric current i 'αWith i 'βSymmetrically, and i 'αWith i 'βPhase
120 ° of difference.
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| CN201710058937.8A CN106787785B (en) | 2017-01-23 | 2017-01-23 | Based on the single-phase converting means of transformer electronic formula compensation three-phase and its compensation method |
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| CN109193709B (en) * | 2018-10-24 | 2022-05-20 | 云南电网有限责任公司电力科学研究院 | 10kV becomes 220V's single-phase power supply system of low pressure |
| CN113346765A (en) * | 2021-05-21 | 2021-09-03 | 西安交通大学 | In-phase power supply device topological structure based on balance transformer and control method |
| CN113315149B (en) * | 2021-05-28 | 2023-03-14 | 武汉大学 | Scott transformer and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104092224A (en) * | 2014-07-04 | 2014-10-08 | 南京南瑞继保电气有限公司 | Convertible static synchronous compensator |
| CN104124682A (en) * | 2014-07-23 | 2014-10-29 | 南京南瑞继保电气有限公司 | Convertible unified power flow controller |
| CN104124694A (en) * | 2014-07-23 | 2014-10-29 | 南京南瑞继保电气有限公司 | Convertible static compensator applicable to a plurality of lines |
| CN106159982A (en) * | 2016-07-26 | 2016-11-23 | 湖南华大紫光科技股份有限公司 | Unified energy storage and conversion control system |
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| JP5013283B2 (en) * | 2010-02-17 | 2012-08-29 | 株式会社安川電機 | Control device for matrix converter |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092224A (en) * | 2014-07-04 | 2014-10-08 | 南京南瑞继保电气有限公司 | Convertible static synchronous compensator |
| CN104124682A (en) * | 2014-07-23 | 2014-10-29 | 南京南瑞继保电气有限公司 | Convertible unified power flow controller |
| CN104124694A (en) * | 2014-07-23 | 2014-10-29 | 南京南瑞继保电气有限公司 | Convertible static compensator applicable to a plurality of lines |
| CN106159982A (en) * | 2016-07-26 | 2016-11-23 | 湖南华大紫光科技股份有限公司 | Unified energy storage and conversion control system |
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