CN102496950B - 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
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- CN102496950B CN102496950B CN201110356365.4A CN201110356365A CN102496950B CN 102496950 B CN102496950 B CN 102496950B CN 201110356365 A CN201110356365 A CN 201110356365A CN 102496950 B CN102496950 B CN 102496950B
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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 the grid-connected feedback device of a kind of high pressure cascade transducer power unit.
Background technology
Along with the development of power electronic technology, cascade high voltage transformer is widely used in the 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 the reliability of product, high pressure concatenated frequency changer all will carry out the senile experiment of power cell before dispatching from the factory, and power cell is worked a period of time under rated current.In high pressure cascade connection type frequency converter industry, the aging techniques of power cell mainly contains two kinds: the aging and reactor load aging of ohmic load.Ohmic load is generally to consist of some power resistor series and parallel connections, by series and parallel connections, reaches different resistances, to adapt to the output current value of different capacity unit.Each resistance platform often needs very large place and very high heat radiation requirement, and simultaneously a large amount of waste of energy are in the heating of resistance.And inductive load is aging, need to mate inductance value for the output current value of power model.The inefficiency of above-mentioned two kinds of load agings, and it is huge to take up room.
Figure 1 shows that the aging electrical schematic diagram of conventional load.Three phase mains input changes into direct current through 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 inductive load; The size of adjusting output current by changing the impedance magnitude of load, reaches aging object.It is large that conventional load aging mode takes up an area space, adjusts complexity, needs commissioning staff to have higher specialized capability; And the aging cost of conventional load is higher, poor operability, is not suitable for the production requirement of modern automation enterprise.
Summary of the invention
The problem mainly solving of the present invention is to propose a kind of novel power cell aging equipment, and control is convenient, applicability is strong and ageing efficiency is high.
The present invention addresses the above problem taked technical scheme and describes as follows:
The grid-connected feedback device of a kind of high pressure cascade transducer power unit, comprise service entrance switch, it is characterized in that: described service entrance switch is connected with the grid-connected transformer of phase shift, the grid-connected transformer of phase shift is connected with 3 power cells to be aging respectively, the grid-connected transformer of phase shift is connected with grid-connected switch simultaneously, grid-connected switch is connected with grid-connected reactor, grid-connected reactor is connected with 3 power cells to be aging respectively, sampling section comprises the three-phase voltage sampling of grid-connected winding, the output voltage sampling of power cell and the output current sampling of power cell, the three-phase voltage sampling of described grid-connected winding, the sampled signal of the output voltage sampling of power cell and the output current sampling of power cell is delivered to control system, by control system, sampled signal is processed.
Described service entrance switch, it act as and connects electrical network and the grid-connected transformer of phase shift, and during the system failure, initiatively disjunction of service entrance switch, plays the protective effect that Accident prevention expands.
The grid-connected transformer of described phase shift, integrated 5 windings, the size of having dwindled whole device.Wherein power supply winding is connected with service entrance switch, 10% of its Capacity Selection total capacity, and power supply winding plays the effect of System Reactive Power and supplementary active power loss; Totally 3 of phase shift windings, each winding phase place is respectively-20 °, 0 °, 20 °, is connected respectively on 3 different power cells.Transformer phase shift winding and power cell form 18 pulse wave rectifiers, by transformer phase shift, reduce to greatest extent the harmonic content of mains side electric current, reduce the harmonic pollution to electrical network, and the capacity of each phase shift winding is respectively 33% of total capacity; Grid-connected winding is connected to grid-connected switch, 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 is connected respectively on the phase shift winding of transformer, and 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 form neutral point, and 3 U form respectively three-phase voltage ABC output, are connected respectively on grid-connected reactor; Power cell is connected with control system by optical fiber, by the control system of real time execution information and transmitting fault information.The DC link of power cell adopts electrochemical capacitor to connect.The precharge loop that DC bus is comprised of controllable silicon, absorption resistance, Absorption Capacitance etc.
Described grid-connected reactor, it is connected on the U binding post and grid-connected switch of three power cells.Grid-connected reactor is three-phase adjustable reactor, according to the current value size of power cell, adjusts reactor sense value, plays the effect of power delivery and filtering.The current harmonics that simultaneously guarantees power cell output under different capacity is less than standard value.
Described grid-connected switch, it is connected to the winding of grid-connected reactor and grid-connected transformer.Grid-connected switch is controlled and is realized by control system.
Described sampling section, it is connected to loop of power circuit and control system.Sampling section mainly comprises the output current sampling of the three-phase voltage sampling of grid-connected winding, the output voltage sampling of power cell and power cell.Sampling section is delivered to control system by these signals, by control system, these signals is processed.
Described control system, it connects sampling section and power cell, sampling processing and grid-connected control unit, computing unit, pulse control unit, man-machine interface, consists of.Control system is processed the voltage of sampling section, electric current; By computing unit with the current Control Algorithm controlled based on PI under synchronous rotating frame by the energy feedback of the absorption of power cell to electrical network, electrical network is replenishment system power loss and reactive power simultaneously, result of calculation outputs to pulse control unit, carry out pulse management, and by optical fiber, carry out communication with power cell, the operation information of emissioning controling signal and received power unit etc.; Man-machine interface can arrange different parameters, realizes different aging currents and controls.
Control method in the control system of the grid-connected feedback device of aforesaid high pressure cascade transducer power unit, comprises the current Control Algorithm of controlling based on PI, it is characterized in that, comprises the following steps:
1) by the phase-locked line voltage angle θ that obtains of the line voltage of sampling, line voltage, output current are carried out to vector decouple, obtain 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 obtaining is exported through 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 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 relatively drawing is through the output of PI controller, the magnitude of voltage obtaining and voltage power-less component E
q, i
dω L relatively obtains reference voltage idle component u
qref;
4) u to gained
dref, u
qrefcarry out inverse transformation and obtain three-phase reference voltage;
5) pulse control unit forms pwm pulse according to three-phase reference voltage, by optical fiber, pwm pulse is sent to power cell.
The grid-connected feedback device of high pressure cascade transducer power unit of the present invention substitutes traditional load aging device, by most of energy feedback, to electrical network, electrical network only supplements system loss seldom, makes power cycles utilization, thereby reach aging object, 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.
Accompanying drawing explanation
The aging electrical schematic diagram of Fig. 1 conventional load;
Fig. 2 power cell electrical structure diagram;
Fig. 3 electrical schematic diagram of the present invention;
Fig. 4 control system control principle drawing;
Fig. 5 system control flow chart.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
As shown in Figure 3, the grid-connected feedback device of a kind of high pressure cascade of the present invention transducer power unit, comprises service entrance switch, the grid-connected transformer of phase shift, power model, grid-connected reactor, grid-connected switch, sampling section, control system.
First, the aging current needing is set by man-machine interface, control system is selected the inductance value of grid-connected reactor according to aging current.
Through certain hour, the closed service entrance switch of control system, line voltage is the power supply winding to the grid-connected transformer of phase shift through service entrance switch, and the DC bus of supply power unit charges, during charging, first pass through resistance, the electric capacity of the parallel connection of controllable silicon lower end, controlled silicon conducting after a period of time.This kind of rectification forms 18 pulse wave rectifiers, reduces the harmonic pollution of power network current.The H bridge of control system power ratio control unit, is converted into 50Hz single phase alternating current power supply by direct current.The V end of power cell output is connected to form common point, and U end forms ABC three-phase.
Meanwhile, control system, by gathering grid-connected switch both sides voltage, judges frequency, amplitude, the phase place of both end voltage, and triadic relation meets after certain relation, and it is closed that control system is controlled grid-connected switch, the grid-connected success of whole system.After the grid-connected success of system, the aging current that control system is set according to man-machine interface carries out Current Control.
Concrete control flow as shown in Figure 5.Control system adopts the current Control Algorithm of controlling based on PI under synchronous rotating frame: computing unit carries out phase-locked to the grid-connected winding voltage collecting, output line voltage angle θ; Voltage and output current are carried out to clark and park conversion, obtain E
d, E
q, i
d, i
q.Initial current i
dwith set-point i
drefrelatively, the difference obtaining 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
dref.Equally, initial current i
qwith set-point i
qrefrelatively, the difference relatively drawing is through the output of PI controller, the magnitude of voltage obtaining and voltage power-less component E
q, i
dω L relatively obtains reference voltage idle component u
qref.The reference voltage u obtaining
dref, u
qrefthrough park and clark inverse transformation, draw ABC three-phase reference voltage, 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 by optical fiber, and the opening and turn-offing of IGBT on power ratio control unit makes power cell output three-phase voltage, accesses the grid-connected winding of transformer after grid-connected reactor, and to electrical network feedback energy.
Meanwhile electrical network provides energy to three power cells by rectification link, the closed loop of forming energy by the phase shift winding of transformer.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 worth.
Claims (1)
1. the control method in the control system of the grid-connected feedback device of high pressure cascade transducer power unit, comprises the current Control Algorithm of controlling based on PI, it is characterized in that, comprises the following steps:
1) by the phase-locked line voltage angle θ that obtains of the line voltage of sampling, line voltage, output current are carried out to vector decouple, obtain 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 obtaining is exported through 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 out put reactor inductance value;
3) same, initial power network current idle component i
qwith idle component set-point i
qrefrelatively, the difference relatively drawing is through the output of PI controller, the magnitude of voltage obtaining and voltage power-less component E
q, i
dω L relatively obtains reference voltage idle component u
qref;
4) u to gained
dref, u
qrefcarry out inverse transformation and obtain three-phase reference voltage;
5) pulse control unit forms pwm pulse according to three-phase reference voltage, by optical fiber, pwm pulse is sent to power cell.
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| CN201110356365.4A CN102496950B (en) | 2011-11-11 | 2011-11-11 | Power unit grid-connected and feedback device for high-voltage concatenated frequency converter |
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| CN201110356365.4A CN102496950B (en) | 2011-11-11 | 2011-11-11 | Power unit grid-connected and feedback device for high-voltage concatenated frequency converter |
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| CN102496950B true CN102496950B (en) | 2014-03-05 |
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Families Citing this family (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 |
| CN106556762B (en) * | 2016-11-30 | 2019-12-24 | 广东明阳龙源电力电子有限公司 | Control method for aging test of cascaded high-voltage frequency converter |
| 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 |
| 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 |
| 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 |
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| 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 |
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Patent Citations (4)
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| 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 |
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