CN102496950A - Power unit grid-connected and feedback device for high-voltage concatenated frequency converter - Google Patents
Power unit grid-connected and feedback device for high-voltage concatenated frequency converter Download PDFInfo
- Publication number
- CN102496950A CN102496950A CN2011103563654A CN201110356365A CN102496950A CN 102496950 A CN102496950 A CN 102496950A CN 2011103563654 A CN2011103563654 A CN 2011103563654A CN 201110356365 A CN201110356365 A CN 201110356365A CN 102496950 A CN102496950 A CN 102496950A
- Authority
- CN
- China
- Prior art keywords
- power
- incorporated
- power networks
- voltage
- networks
- 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.)
- Granted
Links
Images
Landscapes
- Control Of Electrical Variables (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a power unit grid-connected and feedback device for a high-voltage concatenated frequency converter, which comprises an incoming line switch and is characterized in that the incoming line switch is connected with a phase shift grid-connected transformer; the phase shift grid-connected transformer is respectively connected with three power units to be aged and is also connected with a grid-connected switch; the grid-connected switch is connected with a grid-connected reactor which is respectively connected with the three power units to be aged; a sampling part comprises three-phase voltage sampling of a grid-connected winding, output voltage sampling of the power units and output current sampling of the power units; and the sampled signals of the three-phase voltage sampling of the grid-connected winding, and the output voltage sampling and output current sampling of the power units are sent to and processed by a control system. In the invention, the ageing purpose of the power units is realized, the energy is saved, the consumption is reduced, the occupied area is small, the operability is strong, the ageing of the three power units can be performed at the same time, and the production efficiency is improved.
Description
Technical field
The present invention relates to a kind of high pressure cascade transducer power unit senile experiment technology, in particular, relate to a kind of high pressure cascade transducer power unit feedback device that is incorporated into the power networks.
Background technology
Along with the development of power electronic technology, cascade high voltage transformer is widely used in fields such as electric power, metallurgy, petrochemical industry, running water, coal, has saved a large amount of electric energy, has created appreciable economic benefit and social benefit.
In order to guarantee reliability of products, the high pressure concatenated frequency changer all will carry out the senile experiment of power cell before dispatching from the factory, and promptly power cell is worked a period of time under rated current.In high pressure cascade connection type frequency converter industry, the aging mode of power cell mainly contains two kinds: the aging and reactor load aging of ohmic load.Ohmic load generally is to be made up of some power resistor series connection and parallel connection, reaches different resistances through series connection with parallel connection, to adapt to the output current value of different capacity unit.Each resistance platform often needs very big place and very high heat radiation requirement, and simultaneously a large amount of waste of energy are in the heating of resistance.And the aging output current value that needs to be directed against power model of inductive load matees inductance value.The inefficiency of above-mentioned two kinds of load agings, and it is huge to take up room.
Shown in Figure 1ly be the aging electrical schematic diagram of conventional load.The three phase mains input changes into direct current through the power cell rectifier diode, through the inversion of power cell H bridge, is converted into the output of 0～50Hz AC power, and output voltage is applied on ohmic load or the inductive load; Adjust the size of output current through the impedance magnitude that changes load, reach aging purpose.It is big that the conventional load aging mode takes up an area of the space, and adjustment is complicated, needs the commissioning staff to have higher specialized capability; And the aging cost of conventional load is higher, and poor operability is not suitable for the requirement of modern automation enterprise production.
Summary of the invention
The problem that mainly solves of the present invention is to propose a kind of new power units age device, and control is convenient, applicability is strong and ageing efficiency is high.
The present invention addresses the above problem the technical scheme of being taked and describes as follows:
A kind of high pressure cascade transducer power unit feedback device that is incorporated into the power networks; Comprise service entrance switch, it is characterized in that: said service entrance switch and the phase shift transformer that is incorporated into the power networks links to each other; The phase shift transformer that is incorporated into the power networks links to each other with 3 power cells to be aging respectively; The phase shift transformer that is incorporated into the power networks links to each other with the switch that is incorporated into the power networks simultaneously; The switch that is incorporated into the power networks links to each other with the reactor that is incorporated into the power networks, and the reactor that is incorporated into the power networks links to each other with 3 power cells to be aging respectively, and sampling section comprises the three-phase voltage sampling of the winding that is incorporated into the power networks, the output voltage sampling of power cell and the output current sampling of power cell; The sampled signal of the output current sampling of the three-phase voltage sampling of the said winding that is incorporated into the power networks, the output voltage sampling of power cell and power cell is delivered to control system, by control system sampled signal is handled.
Described service entrance switch, it act as and connects electrical network and the phase shift transformer that is incorporated into the power networks, and the protective effect that prevents accident expansion is played in initiatively disjunction of service entrance switch during the system failure.
The described phase shift transformer that is incorporated into the power networks, integrated 5 windings have dwindled whole device size.Wherein the power supply winding links to each other with service entrance switch, 10% of its Capacity Selection total capacity, and the power supply winding plays the effect of the idle and additional active power loss of system; Totally 3 of phase shift windings, each winding phase place are respectively-20 °, 0 °, 20 °, are connected respectively on 3 different power unit.Transformer phase shift winding and power cell are formed 18 pulse wave rectifiers, through the transformer phase shift, reduce the harmonic content of mains side electric current to greatest extent, reduce the harmonic pollution to electrical network, and the capacity of each phase shift winding respectively is 33% of a total capacity; The winding that is incorporated into the power networks is connected to the switch that is incorporated into the power networks, and plays the effect that the power cycle of power model feedback is utilized, and capacity is 100%.
Described power cell, the input of 3 power cells are connected respectively on the phase shift winding of transformer, and the rectification pattern is the uncontrollable rectification of three phase full bridge; Three power cells are output as H bridge type formula, and the V output of 3 H bridges connects together, and constitute neutral point, and 3 U constitute three-phase voltage ABC output respectively, are connected respectively on the reactor that is incorporated into the power networks; Power cell links to each other with control system through optical fiber, with the control system of real time execution information and fault message transmission.The DC link of power cell adopts electrochemical capacitor to connect.The precharge loop that dc bus is made up of controllable silicon, absorption resistance, absorption electric capacity etc.
The described reactor that is incorporated into the power networks, it is connected on the U binding post of three power cells and the switch that is incorporated into the power networks.The reactor that is incorporated into the power networks is the three-phase REgulatable reactor, adjusts reactor sense value according to the current value size of power cell, plays the effect of power delivery and filtering.The current harmonics that guarantees power cell output under the different capacity simultaneously is less than standard value.
The described switch that is incorporated into the power networks, it is connected to the winding of the be incorporated into the power networks reactor and the transformer that is incorporated into the power networks.The switch that is incorporated into the power networks control is realized by control system.
Described sampling section, it is connected to loop of power circuit and control system.Sampling section mainly comprises the three-phase voltage sampling of the winding that is incorporated into the power networks, the output voltage sampling of power cell and the output current sampling of power cell.Sampling section is delivered to control system with these signals, by control system these signals is handled.
Described control system, it connects sampling section and power cell, is made up of sampling processing and the control unit that is incorporated into the power networks, computing unit, pulse control unit, man-machine interface.Control system is handled voltage, the electric current of sampling section; Through computing unit based on the current Control Algorithm of PI control the energy of the absorption of power cell is fed back to electrical network under the synchronous rotating frame; Electrical network is replenishment system power loss and reactive power simultaneously; Result of calculation outputs to pulse control unit; Carry out the pulse management, and carry out communication through optical fiber, the operation information of emissioning controling signal and received power unit etc. with power cell; Man-machine interface can be provided with different parameters, realizes different aging Current Control.
The aforesaid high pressure cascade transducer power unit control method in the control system of feedback device that is incorporated into the power networks comprises based on the current Control Algorithm of PI control, it is characterized in that, may further comprise the steps:
1) the line voltage lock with sampling obtains line voltage angle θ mutually, and line voltage, output current are carried out the vector decoupling zero, obtains line voltage real component E
d, line voltage idle component E
q, power network current real component i
d, power network current idle component i
q, initial power network current real component i
dWith real component set-point i
DrefRelatively, the difference that obtains is exported through the PI controller;
2) magnitude of voltage and the line voltage real component E of output
d, i
qω L (ω is that angular frequency, L are the out put reactor inductance value) relatively obtains reference voltage real component u
Dref
3) same, initial power network current idle component i
qWith idle component set-point i
QrefRelatively, the difference that relatively draws is through the output of PI controller, magnitude of voltage that obtains and voltage power-less component E
q, i
dω L relatively obtains reference voltage idle component u
Qref
4) to the u of gained
Dref, u
QrefCarry out inverse transformation and obtain the three-phase reference voltage;
5) pulse control unit forms pwm pulse according to the three-phase reference voltage, through optical fiber pwm pulse is sent to power cell.
The high pressure cascade transducer power unit of the present invention feedback device that is incorporated into the power networks substitutes the traditional load aging equipment; Most of energy is fed back to electrical network, and electrical network only replenishes system loss seldom, makes the power cycles utilization; Thereby reach aging purpose, can save energy and reduce the cost again simultaneously.In addition, device volume of the present invention is little, control is convenient, applicability is strong, ageing efficiency is high.
Description of drawings
Fig. 1 conventional load electrical schematic diagram that wears out;
Fig. 2 power cell electrical structure diagram;
Fig. 3 electrical schematic diagram of the present invention;
Fig. 4 control system control principle figure;
Fig. 5 system control flow chart.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
As shown in Figure 3, a kind of high pressure cascade of the present invention transducer power unit feedback device that is incorporated into the power networks comprises service entrance switch, phase shift be incorporated into the power networks transformer, power model, the reactor that is incorporated into the power networks, the switch that is incorporated into the power networks, sampling section, control system.
At first, through man-machine interface the aging electric current that needs is set, control system is according to aging electric current select the to be incorporated into the power networks inductance value of reactor.
Through certain hour; The closed service entrance switch of control system, line voltage is through service entrance switch to the phase shift power of transformer winding that is incorporated into the power networks, and the dc bus of supply power unit charges; Elder generation is through controllable silicon lower end parallel resistor, electric capacity, controllable silicon conducting after a period of time during charging.This kind rectification constitutes 18 pulse wave rectifiers, reduces the harmonic pollution of power network current.The H bridge of control system power controlling unit is converted into the 50Hz single phase alternating current power supply with direct current.The V end of power cell output links to each other and forms common point, and the U end forms the ABC three-phase.
Simultaneously, control system is judged frequency, amplitude, the phase place of voltage through the collection switch both sides voltage that is incorporated into the power networks, after the triadic relation satisfies certain relation, and the control system control switch closure that is incorporated into the power networks, whole system is incorporated into the power networks successfully.System is incorporated into the power networks after the success, and the aging electric current that control system is set according to man-machine interface carries out Current Control.
Concrete control flow is as shown in Figure 5.Control system adopts the current Control Algorithm of controlling based on PI under the synchronous rotating frame: computing unit advances horizontal lock to the winding voltage that is incorporated into the power networks that collects, output line voltage angle θ; Voltage and output current are carried out clark and park conversion, obtain E
d, E
q, i
d, i
qInitial current i
dWith set-point i
DrefRelatively, the difference that obtains is through the output of PI controller, the magnitude of voltage of output and line voltage real component E
d, i
qω L relatively obtains reference voltage real component u
DrefEqually, initial current i
qWith set-point i
QrefRelatively, the difference that relatively draws is through the output of PI controller, magnitude of voltage that obtains and voltage power-less component E
q, i
dω L relatively obtains reference voltage idle component u
QrefThe reference voltage u that obtains
Dref, u
QrefDraw ABC three-phase reference voltage through park and clark inverse transformation, be sent to pulse control unit and carry out pulse distribution, form three-phase PWM signal.Pwm signal has control system to be transferred to three power cells through optical fiber, and the opening and turn-offing of IGBT on the power controlling unit makes power cell output three-phase voltage, behind the reactor that is incorporated into the power networks, inserts the transformer winding that is incorporated into the power networks, and to the electrical network feedback energy.
Meanwhile electrical network provides energy to three power cells through the rectification link through the phase shift winding of transformer, forms the closed loop of energy.The power loss of power network compensation whole system.
Beneficial effect of the present invention is: strong operability, and control performance is good, and reliability is high; Electric energy feedback rate is high, and energy-saving effect is remarkable; Floor space is little, can carry out three power cell senile experiments simultaneously, has greatly improved production efficiency, has created considerable economic value.
Claims (7)
1. high pressure cascade transducer power unit feedback device that is incorporated into the power networks; Comprise service entrance switch, it is characterized in that: said service entrance switch and the phase shift transformer that is incorporated into the power networks links to each other; The phase shift transformer that is incorporated into the power networks links to each other with 3 power cells to be aging respectively; The phase shift transformer that is incorporated into the power networks links to each other with the switch that is incorporated into the power networks simultaneously; The switch that is incorporated into the power networks links to each other with the reactor that is incorporated into the power networks, and the reactor that is incorporated into the power networks links to each other with 3 power cells to be aging respectively, and sampling section comprises the three-phase voltage sampling of the winding that is incorporated into the power networks, the output voltage sampling of power cell and the output current sampling of power cell; The sampled signal of the output current sampling of the three-phase voltage sampling of the said winding that is incorporated into the power networks, the output voltage sampling of power cell and power cell is delivered to control system, by control system sampled signal is handled.
2. the high pressure cascade transducer power unit according to claim 1 feedback device that is incorporated into the power networks is characterized in that: said phase shift be incorporated into the power networks transformer integrated 5 windings, wherein the power supply winding links to each other with service entrance switch; Totally 3 of phase shift windings, each winding phase place are respectively-20 °, 0 °; 20 °; Be connected respectively on 3 different power unit, transformer phase shift winding and power cell are formed 18 pulse wave rectifiers, and the winding that is incorporated into the power networks is connected to the switch that is incorporated into the power networks.
3. the high pressure cascade transducer power unit according to claim 2 feedback device that is incorporated into the power networks, it is characterized in that: the input of said 3 power cells is connected respectively on the phase shift winding of transformer, and the rectification pattern is the uncontrollable rectification of three phase full bridge; Three power cells are output as H bridge type formula, and the V output of 3 H bridges connects together, and constitute neutral point, and 3 U constitute three-phase voltage ABC output respectively, are connected respectively on the reactor that is incorporated into the power networks; Each power cell links to each other with control system through optical fiber, with the control system of real time execution information and fault message transmission.
4. the high pressure cascade transducer power unit according to claim 3 feedback device that is incorporated into the power networks is characterized in that: the DC link of said power cell adopts three groups of electrochemical capacitors series connection.
5. the high pressure cascade transducer power unit according to claim 2 feedback device that is incorporated into the power networks; It is characterized in that: the said reactor that is incorporated into the power networks is connected on the U binding post of three power cells and the switch that is incorporated into the power networks; The reactor that is incorporated into the power networks is the three-phase regulative reactance, adjusts reactor sense value according to the current value size of power cell.
6. the high pressure cascade transducer power unit according to claim 1 and 2 feedback device that is incorporated into the power networks; It is characterized in that: said control system connects sampling section and power cell; Comprise sampling processing and the control unit that is incorporated into the power networks, high-speed dsp computing unit, pulse control unit and man-machine interface; The said sampling processing and the control unit that is incorporated into the power networks carry out filtering and processing to sampled signal, control the switch motion of being incorporated into the power networks simultaneously; The current Control Algorithm of high-speed dsp computing unit to control based on PI under the synchronous rotating frame; Calculate the output reference voltage signal; And result of calculation outputed to pulse control unit; Carry out the pulse management, and carry out communication through optical fiber, the operation information of emissioning controling signal and received power unit with power cell.
7. the high pressure cascade transducer power unit according to claim 1 control method in the control system of feedback device that is incorporated into the power networks comprises based on the current Control Algorithm of PI control, it is characterized in that, may further comprise the steps:
1) the line voltage lock with sampling obtains line voltage angle θ mutually, and line voltage, output current are carried out the vector decoupling zero, obtains line voltage real component E
d, line voltage idle component E
q, power network current real component i
d, power network current idle component i
q, initial power network current real component i
dWith real component set-point i
DrefRelatively, the difference that obtains is exported through the PI controller;
2) magnitude of voltage and the line voltage real component E of output
d, i
qω L relatively obtains reference voltage real component u
Dref, ω is that angular frequency, L are the out put reactor inductance value;
3) same, initial power network current idle component i
qWith idle component set-point i
QrefRelatively, the difference that relatively draws is through the output of PI controller, magnitude of voltage that obtains and voltage power-less component E
q, i
dω L relatively obtains reference voltage idle component u
Qref
4) to the u of gained
Dref, u
QrefCarry out inverse transformation and obtain the three-phase reference voltage;
5) pulse control unit forms pwm pulse according to the three-phase reference voltage, through optical fiber pwm pulse is sent to power cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110356365.4A CN102496950B (en) | 2011-11-11 | 2011-11-11 | Power unit grid-connected and feedback device for high-voltage concatenated frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110356365.4A CN102496950B (en) | 2011-11-11 | 2011-11-11 | Power unit grid-connected and feedback device for high-voltage concatenated frequency converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102496950A true CN102496950A (en) | 2012-06-13 |
| CN102496950B CN102496950B (en) | 2014-03-05 |
Family
ID=46188749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110356365.4A Active CN102496950B (en) | 2011-11-11 | 2011-11-11 | Power unit grid-connected and feedback device for high-voltage concatenated frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102496950B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023063A (en) * | 2012-10-24 | 2013-04-03 | 国电南京自动化股份有限公司 | Grid-connection feedback device of high-voltage inverter and control method of grid-connection feedback device |
| CN103487675A (en) * | 2013-07-03 | 2014-01-01 | 东方日立(成都)电控设备有限公司 | Ageing experiment system and method for static dynamic reactive power adjusting devices |
| CN104034981A (en) * | 2014-06-18 | 2014-09-10 | 上海吉亿电机有限公司 | Self-circulation aging test system and test method for frequency converter |
| CN106556762A (en) * | 2016-11-30 | 2017-04-05 | 广东明阳龙源电力电子有限公司 | A kind of control strategy for tandem type high voltage converter burn-in test |
| CN108574305A (en) * | 2018-05-22 | 2018-09-25 | 国电南京自动化股份有限公司 | Cascaded high-voltage frequency converter power cell load platform with feedback function |
| CN109116128A (en) * | 2017-06-26 | 2019-01-01 | 株洲变流技术国家工程研究中心有限公司 | A kind of frequency converter total power certification test method and device |
| CN109270312A (en) * | 2018-09-03 | 2019-01-25 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | A kind of more electric aircraft self coupling vertoro load simulating devices |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5625545A (en) * | 1994-03-01 | 1997-04-29 | Halmar Robicon Group | Medium voltage PWM drive and method |
| CN101431290A (en) * | 2008-12-15 | 2009-05-13 | 株洲变流技术国家工程研究中心有限公司 | Optical fiber connecting method for cascade type medium-high voltage frequency convertor |
| CN101699765A (en) * | 2009-11-09 | 2010-04-28 | 天津理工大学 | Cascade multilevel variable frequency speed control system based on phase-shifting SVPWM modulation method |
| CN202353232U (en) * | 2011-11-11 | 2012-07-25 | 国电南京自动化股份有限公司 | High-voltage cascaded inverter power unit grid-connection feedback device |
-
2011
- 2011-11-11 CN CN201110356365.4A patent/CN102496950B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5625545A (en) * | 1994-03-01 | 1997-04-29 | Halmar Robicon Group | Medium voltage PWM drive and method |
| CN101431290A (en) * | 2008-12-15 | 2009-05-13 | 株洲变流技术国家工程研究中心有限公司 | Optical fiber connecting method for cascade type medium-high voltage frequency convertor |
| CN101699765A (en) * | 2009-11-09 | 2010-04-28 | 天津理工大学 | Cascade multilevel variable frequency speed control system based on phase-shifting SVPWM modulation method |
| CN202353232U (en) * | 2011-11-11 | 2012-07-25 | 国电南京自动化股份有限公司 | High-voltage cascaded inverter power unit grid-connection feedback device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023063A (en) * | 2012-10-24 | 2013-04-03 | 国电南京自动化股份有限公司 | Grid-connection feedback device of high-voltage inverter and control method of grid-connection feedback device |
| CN103487675A (en) * | 2013-07-03 | 2014-01-01 | 东方日立(成都)电控设备有限公司 | Ageing experiment system and method for static dynamic reactive power adjusting devices |
| CN104034981A (en) * | 2014-06-18 | 2014-09-10 | 上海吉亿电机有限公司 | Self-circulation aging test system and test method for frequency converter |
| CN106556762A (en) * | 2016-11-30 | 2017-04-05 | 广东明阳龙源电力电子有限公司 | A kind of control strategy for tandem type high voltage converter burn-in test |
| CN109116128A (en) * | 2017-06-26 | 2019-01-01 | 株洲变流技术国家工程研究中心有限公司 | A kind of frequency converter total power certification test method and device |
| CN108574305A (en) * | 2018-05-22 | 2018-09-25 | 国电南京自动化股份有限公司 | Cascaded high-voltage frequency converter power cell load platform with feedback function |
| CN108574305B (en) * | 2018-05-22 | 2021-03-19 | 国电南京自动化股份有限公司 | Cascaded high-voltage frequency converter power unit load platform with feedback function |
| CN109270312A (en) * | 2018-09-03 | 2019-01-25 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | A kind of more electric aircraft self coupling vertoro load simulating devices |
| CN109270312B (en) * | 2018-09-03 | 2021-06-01 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Load simulation device for auto-transformer rectifier of multi-electric aircraft |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102496950B (en) | 2014-03-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102916437B (en) | The soft combination method of a kind of grid-connected converter | |
| CN202353232U (en) | High-voltage cascaded inverter power unit grid-connection feedback device | |
| Wang et al. | Autonomous control of inverter-interfaced distributed generation units for harmonic current filtering and resonance damping in an islanded microgrid | |
| CN102496950B (en) | Power unit grid-connected and feedback device for high-voltage concatenated frequency converter | |
| CN112421670B (en) | Intermediate-frequency flexible direct-current power transmission system suitable for sending out wind power from open sea and control method thereof | |
| CN109217687A (en) | Power distribution network electric power electric transformer and its control method based on MMC | |
| CN101499728A (en) | High voltage frequency conversion apparatus having STATCOM function, control method and control apparatus | |
| CN110086198A (en) | A kind of multiterminal Hybrid HVDC system grid-connected suitable for offshore wind farm and starting control method | |
| CN102244466B (en) | Voltage sag generator | |
| CN103023063A (en) | Grid-connection feedback device of high-voltage inverter and control method of grid-connection feedback device | |
| CN103051281A (en) | High-performance four-quadrant frequency converter | |
| CN103023344A (en) | Universal smart grid power electronic device | |
| CN108512452A (en) | A kind of control system and control method of direct-current grid grid-connection converter electric current | |
| CN203027153U (en) | Universal smart power grid power electronic device | |
| CN102255603B (en) | Comprehensive control system and method based on high voltage motor control and reactive power compensation | |
| CN202085085U (en) | Large power efficient energy-consuming high frequency switch power supply | |
| CN108063443A (en) | A kind of alternating current-direct current bi-directional power conversion control method | |
| CN208767793U (en) | A kind of distribution transformer active power balancer based on electronic power convertor | |
| Ramesh et al. | Stabilty of Power Transmission Capability of HVDC system using facts controllers | |
| CN109946560A (en) | The current transformer polarity adaptive approach of photovoltaic DC-to-AC converter | |
| CN203119838U (en) | High-performance four-quadrant frequency converter | |
| CN202206344U (en) | Integrated control system based on high-voltage motor control and reactive power compensation | |
| CN106208059B (en) | Adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system and suppressing method | |
| CN108879739A (en) | A kind of three-phase imbalance regulating device | |
| CN207251208U (en) | A kind of background harmonics isolator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |