CN107453360A - A kind of power supply quality optimizes device and method - Google Patents
A kind of power supply quality optimizes device and method Download PDFInfo
- Publication number
- CN107453360A CN107453360A CN201610374052.4A CN201610374052A CN107453360A CN 107453360 A CN107453360 A CN 107453360A CN 201610374052 A CN201610374052 A CN 201610374052A CN 107453360 A CN107453360 A CN 107453360A
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- Prior art keywords
- voltage
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- current
- power supply
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1892—Arrangements for adjusting, eliminating or compensating reactive power in networks the arrangements being an integral part of the load, e.g. a motor, or of its control circuit
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a device and method for improving grid supply quality.Allowed band is far below for supplying power allocation line end voltage, voltage pulsation simultaneously is very big, low voltage electric network generally frequently occurs overload phenomenon, low-voltage circuit loss is caused to significantly increase, the power factor of whole low voltage electric network is low, mains ripple is big, and power supply qualification rate is low, and causes significant damage to electric equipment.Power supply quality is installed additional for low voltage electric network optimizes device, supply voltage can be automatically adjusted in real time, stabilize it in standard value, can directly it be provided to electrical equipment idle, the line loss of low-voltage network is greatly lowered, make it is idle reach balance on the spot, improve the actual transmission line capability of power distribution network, harmonic carcellation electric current is in loss caused by circuit and to interference caused by other electrical equipments.
Description
Technical field
The present invention relates to a device and method for improving grid supply quality.
Background technology
With the improvement of people ' s living standards with the popularization of household electrical appliance, the power consumption of low-voltage customer, particularly residential customer is year by year
Increase substantially, but the distribution line such as factories and miness unit, residential quarters, shop renovates, speed relatively lags behind, and causes circuit last
Terminal voltage is far below allowed band, while voltage pulsation is very big, and low voltage electric network generally frequently occurs overload phenomenon, washing machine,
The non-illumination load such as air conditioner, television set is difficult to normal work, and causes significant damage to electric equipment.It is simultaneously as newly-increased
Electrical load is very big to reactive power demand largely using slewing and power electronic equipments such as motor, compressors, and produces
Raw a large amount of higher harmonic currents, thus cause low-voltage circuit loss to significantly increase, the power factor of whole low voltage electric network is low, power supply
Voltage pulsation is big, and power supply qualification rate is low.
The preferred plan to solve the above problems is the principle deferred to local compensation, administered on the spot, online in low-voltage distribution, directly
Install reactive-load compensation, harmonic wave control and voltage self-checking device additional.Reactive-load compensation, harmonic wave control and voltage are installed additional for low voltage electric network
Self-checking device, supply voltage can be automatically adjusted in real time, stabilized it in standard value, can directly be provided to electrical equipment it is idle,
The line loss of low-voltage network is greatly lowered, make it is idle reach balance on the spot, improve the actual transmission line capability of power distribution network；Filter out
Harmonic current caused by the user equipment of low-voltage network, harmonic carcellation electric current is in loss caused by circuit and to other electrical equipments
Caused interference；Improve 10/0.4kV transformer station high-voltage side bus securities；Significantly improve due to high-tension line thunderbolt, instantaneous short circuit,
The abnormal conditions such as voltage flicker caused by the reasons such as overload, protect the safety of electrical equipment.
The content of the invention
The purpose of the present invention is a kind of power supply quality optimization device and method of design, and it has, and cost is low, and reliability is high, maintenance side
Just, power factor of electric network can be improved, filter out mains by harmonics, regulation and stable power network supply voltage.
A kind of power supply quality optimization device designed by the present invention, it includes：
One AC power input, includes No.1 port and No. two ports；
One single-phase reversible voltage-multiplying circuit, for adjusting ac-side current and DC voltage；
One input reactance device, its one end couple with the No.1 port inputted with the AC power, its other end with it is described single-phase
The AC connection of reversible voltage-multiplying circuit, for limiting, smooth AC power electric current；
One DC filtering circuit, DC side of its positive and negative end respectively with the single-phase reversible voltage-multiplying circuit are connected, its midpoint with
No. two ports connection of the AC power input, for realizing voltage filter function；
One single-phase inversion circuit, its DC side are connected with the DC side of the DC filtering circuit, turn direct current for realizing
It is changed into alternating current；
One transformer, one end of its primary side are connected with the AC of the single-phase inversion circuit, the other end of its primary side with it is described
The midpoint connection of DC filtering circuit, one end of the transformer secondary are connected with AC power No.1 port, transformer secondary
Output end of the other end as apparatus of the present invention, the transformer are used to the output exchange of the single-phase inversion circuit being electrically coupled simultaneously
Change is depressed into vice-side winding；
One by-pass switch, it is connected with the primary side or secondary of the transformer, for apparatus of the present invention to be standby or protection during failure；
One AC voltage sensor, its input is connected with two ports of the AC power respectively, for detecting alternating current
The voltage in source；
One direct current voltage sensor circuit, its input is connected with the DC filtering circuit, for detecting DC voltage；
One current sensor, is coupled with a port of the AC power, for detecting the electric current of AC power；
One control unit, couple with the AC voltage sensor, direct current voltage sensor circuit, current sensor, and adopt
Collect AC supply voltage, DC voltage, ac current signal；Described control unit also with the single-phase reversible voltage-multiplying circuit, list
Phase inverter circuit is connected, to control its working condition；Described control unit also couples with the by-pass switch, controls the logical of its
It is disconnected.
Above-mentioned AC power input, it is the single phase alternating current power supply input of 220V voltage class or 400V voltage class.
Above-mentioned single-phase reversible voltage-multiplying circuit, it is include the semiconductor power switch devices such as two or two groups IGBT composition one
Bridge arm.
Above-mentioned DC filtering circuit, it is to include two or two groups, by electrolytic capacitor or thin film capacitor or ultracapacitor
The circuit being connected into.
Above-mentioned single-phase inversion circuit, it is a bridge for including the semiconductor power switch devices such as two or two groups IGBT composition
Arm.
A kind of power supply quality optimization device designed by the present invention, in addition to one group of low pass for being parallel to the transformer secondary winding
Filter circuit, the low-pass filter circuit include ac filter capacitor.
Above-mentioned control unit includes microcontroller (CPU) chip, and the microcontroller is stored with executable code and data,
The control to the single-phase reversible voltage-multiplying circuit, single-phase inversion circuit, by-pass switch can be achieved.
A kind of power supply quality optimization method designed by the present invention, comprises the following steps：
AC supply voltage and electric current are gathered by AC voltage sensor and current sensor by control unit；
Measured power factor is calculated according to the phasometer of the voltage of above-mentioned collection, electric current；
The above-mentioned measured power factor being calculated is contrasted with the ideal power factor value set；
When measured power factor and ideal power factor value have deviation, adjusted in real time by control unit to single-phase reversible times of piezoelectricity
The pwm pulse duty factors that road is sent, so as to adjust the size of AC reactive current, reduce above-mentioned deviation, reach stable
The purpose of power factor；
The DC voltage of DC filtering circuit is gathered by direct current voltage sensor circuit by control unit；
The above-mentioned DC voltage collected is contrasted with the ideal DC voltage set；
When surveying DC voltage and ideal DC magnitude of voltage has deviation, adjusted in real time by control unit to single-phase reversible times of piezoelectricity
The pwm pulse duty factors that road is sent, so as to adjust the size of AC watt current, reduce above-mentioned deviation, reach stable
The purpose of DC voltage；
According to the actual measurement AC supply voltage value collected, contrasted with set preferable ac voltage；
When the AC supply voltage value of actual measurement and preferable ac voltage have deviation, adjusted in real time by control unit to single-phase inverse
Become the pwm pulse duty factors that circuit is sent, so as to adjust the AC voltage of single-phase inversion circuit, and then adjust transformer pair
Side winding voltage, after the vice-side winding voltage is superimposed with AC supply voltage, a total output voltage is formed, is adjusted so as to reach
Save the purpose of output voltage；
A kind of power supply quality optimization method designed by the present invention, it also includes step：
According to the current value collected, harmonic current is calculated；
The pwm pulse duty factors sent to the single-phase reversible voltage-multiplying circuit are adjusted in real time by control unit, so as to adjust list
The ac-side current of mutually reversible voltage-multiplying circuit, it is set to produce an electric current opposite with the above-mentioned harmonic current symbol calculated, with
Realize the purpose for eliminating AC power harmonic current.
Brief description of the drawings
Fig. 1 is the electrical structure diagram of power supply quality optimization device of the present invention.
Fig. 2 is one embodiment figure of power supply quality optimization device of the present invention.
Embodiment
Below in conjunction with the accompanying drawings, power supply quality optimization device implementation of the present invention and the course of work is discussed in detail.
As shown in figure 1, it is the electrical structure diagram of electricity quality optimization device.Wherein AC power is by No.1 port 1 and No. two
Port 2 is accessed, and No.1 port is connected by inductance 3 with the AC of single-phase reversible voltage-multiplying circuit 4, and No. two ports are filtered with direct current
The midpoint connection of wave circuit 5, the DC side of single-phase reversible voltage-multiplying circuit 4 are connected with the positive and negative end of DC filtering circuit 5.It is defeated
Enter alternating current to filter after single-phase reversible voltage-multiplying circuit 4 is modulated, then through DC filtering circuit 5, be changed into direct current.
The DC side of single-phase inversion circuit 6 is connected with the positive and negative end of DC filtering circuit 5.The friendship of single-phase inversion circuit 6
Primary side one end of side connection transformer 8 is flowed, the primary side other end of transformer 8 is connected with the midpoint of DC filtering circuit 5.Transformation
One section of the vice-side winding of device 8 is connected with No.1 port 1, output port of the other end as apparatus of the present invention.Single-phase inversion circuit
6 one voltage after PWM of output, put on the primary side winding of transformer 8, the voltage after the transformation of transformer 8,
It is connected in series with No.1 port, so as to play a part of adjusting output voltage.
The vice-side winding of transformer 8 by-pass switch 7 in parallel simultaneously, bypass path during as failure and maintenance.
Control unit 11 is connected with single-phase reversible voltage-multiplying circuit 4 and single-phase inversion circuit 6, for controlling wherein semiconductor to open
The switching state of device is closed, while whether working properly detect its.
Control unit 11 connects with AC voltage sensor 10, direct current voltage sensor circuit 12, current sensor 9 simultaneously
Connect, for detecting the input ac power voltage of apparatus of the present invention, electric current and the voltage of DC filtering circuit 5.
Fig. 2 is one embodiment figure of power supply quality optimization device of the present invention, and its AC power, which comes in and goes out, can access 220V exchanges
Electricity, wherein single-phase reversible voltage-multiplying circuit 4 is made up of the IGBT single-phase bridges 14 of two series connection, its AC and input AC electricity
No.1 port is connected, and single-phase inversion circuit 6 is made up of the IGBT single-phase bridges 15 of two series connection, its AC and transformer primary
Side connects.
Low-pass filter circuit 16 is in parallel with by-pass switch 7, for filtering out the dither current of transformer secondary.
A kind of power supply quality optimization method designed by the present invention, its course of work are realized by following steps：
AC supply voltage and electric current are gathered by AC voltage sensor 10 and current sensor 9 by control unit 11, according to
Voltage, the phasometer of electric current gathered calculates measured power factor, by the above-mentioned measured power factor being calculated and setting
Ideal power factor value contrasted, when measured power factor and ideal power factor value have deviation, pass through control unit 6
The pwm pulse duty factors sent to single-phase reversible voltage-multiplying circuit 4 are adjusted in real time, so as to adjust the idle electricity of AC power input
The size of stream, reduce above-mentioned deviation, reach the purpose of firm power factor.
Control unit 11 by direct current voltage sensor circuit gather DC filtering circuit DC voltage, and with the ideal of setting
DC voltage is contrasted, and when surveying DC voltage and ideal DC magnitude of voltage has deviation, is adjusted in real time by control unit 11
The pwm pulse duty factors sent to single-phase reversible voltage-multiplying circuit 4 are saved, so as to adjust the size of AC watt current, are made
Deviation reduction is stated, reaches the purpose of stable DC voltage；
Control unit 11 is contrasted with set preferable ac voltage according to the actual measurement AC supply voltage value collected,
When the AC supply voltage value of actual measurement and preferable ac voltage have deviation, adjusted in real time to single-phase inverse by control unit 11
Become the pwm pulse duty factors that circuit 6 is sent, so as to adjust the AC voltage of single-phase inversion circuit 6, and then adjust transformation
After the voltage superposition of the vice-side winding voltage of device 8, the vice-side winding voltage and AC power input, a total output voltage is formed,
So as to reach the purpose of regulation output voltage；
Control unit 11 calculates harmonic current according to the current value collected, adjusted in real time by control unit 11 to
The pwm pulse duty factors that the single-phase reversible voltage-multiplying circuit 4 is sent, so as to adjust the AC of single-phase reversible voltage-multiplying circuit 4
Electric current, it is set to produce an electric current opposite with the above-mentioned harmonic current symbol calculated, to realize that elimination AC power input is humorous
The purpose of ripple electric current.
Claims (9)
1. a kind of power supply quality optimizes device, it is characterised in that：It includes：
One AC power input, includes No.1 port and No. two ports；
One single-phase reversible voltage-multiplying circuit, for adjusting ac-side current and DC voltage；
One input reactance device, its one end couple with the No.1 port inputted with the AC power, and its other end couples with the AC of the single-phase reversible voltage-multiplying circuit, for limiting, smooth AC power electric current；
One DC filtering circuit, DC side of its positive and negative end respectively with the single-phase reversible voltage-multiplying circuit are connected, and its midpoint is connected with No. two ports of the AC power, for realizing voltage filter function；
One single-phase inversion circuit, its DC side are connected with the DC side of the DC filtering circuit, and direct current is changed into alternating current for realizing；
One transformer, one end of its primary side is connected with the AC of the single-phase inversion circuit, the other end of its primary side is connected with the midpoint of the DC filtering circuit, one end of the transformer secondary is connected with AC power No.1 port, output end of the other end of transformer secondary as apparatus of the present invention, the transformer are used to the output exchange of the single-phase inversion circuit is electrically coupled and become to be depressed into vice-side winding；
One by-pass switch, it is connected with the primary side or secondary of the transformer, for apparatus of the present invention to be standby or protection during failure；
One AC voltage sensor, its input is connected with two ports of the AC power respectively, for detecting the voltage of AC power；
One direct current voltage sensor circuit, its input is connected with the DC filtering circuit, for detecting DC voltage；
One current sensor, is coupled with a port of the AC power, for detecting the electric current of AC power；
One control unit, couple with the AC voltage sensor, direct current voltage sensor circuit, current sensor, and gather AC supply voltage, DC voltage, ac current signal；Described control unit is also connected with the single-phase reversible voltage-multiplying circuit, single-phase inversion circuit, to control its working condition；Described control unit also couples with the by-pass switch, controls its break-make.
A kind of 2. power supply quality optimization device according to claim 1, it is characterised in that：Described AC power input, it is the single phase alternating current power supply input of 220V voltage class or 400V voltage class.
A kind of 3. power supply quality optimization device according to claim 1, it is characterised in that：Described single-phase reversible voltage-multiplying circuit, it is a bridge arm for including the semiconductor power switch devices such as two or two groups IGBT composition.
A kind of 4. power supply quality optimization device according to claim 1, it is characterised in that：Described DC filtering circuit, it is the circuit for including two or two groups, being connected into by electrolytic capacitor or thin film capacitor or ultracapacitor.
A kind of 5. power supply quality optimization device according to claim 1, it is characterised in that：Described single-phase inversion circuit, it is a bridge arm for including the semiconductor power switch devices such as two or two groups IGBT composition.
6. a kind of power supply quality optimization device according to claim 1, it is characterised in that it also includes：One group of low-pass filter circuit for being parallel to the transformer secondary winding, the low-pass filter circuit include ac filter capacitor.
A kind of 7. power supply quality optimization device according to claim 1, it is characterised in that：Described control unit includes microcontroller (CPU) chip, and the microcontroller is stored with executable code and data, and the control to the single-phase reversible voltage-multiplying circuit, single-phase inversion circuit, by-pass switch can be achieved.
8. a kind of power supply quality optimization method, it is characterised in that it comprises the following steps：
AC supply voltage and electric current are gathered by AC voltage sensor and current sensor by control unit；
Measured power factor is calculated according to the phasometer of the voltage of above-mentioned collection, electric current；
The above-mentioned measured power factor being calculated is contrasted with the ideal power factor value set；
When measured power factor and ideal power factor value have deviation, adjust the pwm pulse duty factors sent to single-phase reversible voltage-multiplying circuit in real time by control unit, so as to adjust the size of AC power input reactive current, reduce above-mentioned deviation, reach the purpose of firm power factor；
The DC voltage of DC filtering circuit is gathered by direct current voltage sensor circuit by control unit
The above-mentioned DC voltage collected is contrasted with the ideal DC voltage set；
When surveying DC voltage and ideal DC magnitude of voltage has deviation, adjust the pwm pulse duty factors sent to single-phase reversible voltage-multiplying circuit in real time by control unit, so as to adjust the size of AC watt current, reduce above-mentioned deviation, reach the purpose of stable DC voltage；
According to the actual measurement AC supply voltage value collected, contrasted with set preferable ac voltage；
When the AC supply voltage value of actual measurement and preferable ac voltage have deviation, adjust the pwm pulse duty factors sent to single-phase inversion circuit in real time by control unit, so as to adjust the AC voltage of single-phase inversion circuit, and then adjust transformer secondary winding voltage, after the vice-side winding voltage is superimposed with AC supply voltage, a total output voltage is formed, so as to reach the purpose of regulation output voltage.
9. a kind of power supply quality optimization installation method according to claim 8, it is characterised in that further comprising the steps of：
According to the current value collected, harmonic current is calculated；
Adjust the pwm pulse duty factors sent to the single-phase reversible voltage-multiplying circuit in real time by control unit, so as to adjust the ac-side current of single-phase reversible voltage-multiplying circuit, it is set to produce an electric current opposite with the above-mentioned harmonic current symbol calculated, to realize the purpose for eliminating AC power input harmonic current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610374052.4A CN107453360A (en) | 2016-06-01 | 2016-06-01 | A kind of power supply quality optimizes device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610374052.4A CN107453360A (en) | 2016-06-01 | 2016-06-01 | A kind of power supply quality optimizes device and method |
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| Publication Number | Publication Date |
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| CN107453360A true CN107453360A (en) | 2017-12-08 |
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| CN201610374052.4A Withdrawn CN107453360A (en) | 2016-06-01 | 2016-06-01 | A kind of power supply quality optimizes device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769221A (en) * | 2016-08-17 | 2018-03-06 | 新能动力（北京）电气科技有限公司 | A kind of power supply quality optimizes device and method |
| CN108173427A (en) * | 2017-12-14 | 2018-06-15 | 珠海格力电器股份有限公司 | Control method and device of power factor correction circuit, storage medium and electric appliance |
| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
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| CN101170284A (en) * | 2007-09-28 | 2008-04-30 | 清华大学 | Single-phase integrated power quality controller for electric railway power supply |
| US20120069614A1 (en) * | 2010-09-20 | 2012-03-22 | Jung-Wook Park | Power supply system and method including power generator and storage device |
| CN103326361A (en) * | 2012-03-20 | 2013-09-25 | 上海利思电气有限公司 | Low-voltage real-time dynamic active harmonic reactive power compensation cabinet |
| CN205791529U (en) * | 2016-05-26 | 2016-12-07 | 新能动力（北京）电气科技有限公司 | A kind of power supply quality optimizes device |
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2016
- 2016-06-01 CN CN201610374052.4A patent/CN107453360A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170284A (en) * | 2007-09-28 | 2008-04-30 | 清华大学 | Single-phase integrated power quality controller for electric railway power supply |
| US20120069614A1 (en) * | 2010-09-20 | 2012-03-22 | Jung-Wook Park | Power supply system and method including power generator and storage device |
| CN103326361A (en) * | 2012-03-20 | 2013-09-25 | 上海利思电气有限公司 | Low-voltage real-time dynamic active harmonic reactive power compensation cabinet |
| CN205791529U (en) * | 2016-05-26 | 2016-12-07 | 新能动力（北京）电气科技有限公司 | A kind of power supply quality optimizes device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769221A (en) * | 2016-08-17 | 2018-03-06 | 新能动力（北京）电气科技有限公司 | A kind of power supply quality optimizes device and method |
| CN108173427A (en) * | 2017-12-14 | 2018-06-15 | 珠海格力电器股份有限公司 | Control method and device of power factor correction circuit, storage medium and electric appliance |
| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
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Application publication date: 20171208 |