CN101499728A - High voltage frequency conversion apparatus having STATCOM function, control method and control apparatus - Google Patents
High voltage frequency conversion apparatus having STATCOM function, control method and control apparatus Download PDFInfo
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Abstract
The invention discloses a high-voltage frequency-changing device with an STATCOM function, a control method of the high-voltage frequency-changing device and a control system thereof; an energy feedback-typed high-voltage frequency converter with the STATCOM function can carry out the speed regulation and control of an AC motor, and also realize the real-time reactive compensation function owned by the STATCOM simultaneously, thereby compensating impact reactive power of the nonlinear load of the system and stabilizing the power network voltage; the energy-saving effect exceeds the sum of that of the high-voltage frequency converter and the reactive compensation energy-saving effect, and the comprehensive energy-saving index reaches more than 45%; furthermore, as the two devices are integrated into a whole, the total cost of the whole device material saves more than 25%, thus greatly reducing the material cost.
Description
Technical field
The present invention relates to a kind of converter technique, and relate to high voltage frequency converter, control method and control device with STATCOM function.
Background technology
Semiconductor Converting Technology is a key technology of building resource-conserving and friendly environment society.High-pressure frequency-conversion technology and reactive power compensation technology based on Semiconductor Converting Technology are to solve the energy-conservation and topmost technology in quality of power supply raising aspect of high-voltage motor at present.For load, the power source that provides high-quality for load based on the high-pressure frequency-conversion technology and the reactive power compensation technology of Semiconductor Converting Technology, the environment for use of high-quality also is provided for electric network source simultaneously, and these two technology have been brought into play important function separately as the different electric energy quality optimizing technology of two classes under different application conditions.
Because high-pressure frequency-conversion and STATCOM technology specialty are very strong, in the process that through engineering approaches is implemented, can only see separately independently high-pressure frequency-conversion apparatus and STATCOM device (Static Var Compensator---static synchronous reactive-load compensator) at present, it is independent high voltage frequency converter to the motor power supply, with independent access electrical network, the electrical network electric energy is carried out the STATCOM device of power back-off.So independent STATCOM can only be as power back-off equipment, perhaps independent high voltage converter can only be as electric energy quality optimizing and motor speed regulation equipment, also do not occur and high-pressure frequency-conversion technology and STATCOM technology can be integrated, the convertor assembly that not only can carry out the realtime power compensation but also can carry out the speed governing power supply simultaneously to the load alternating current machine.
Following two kinds of schemes are arranged in the prior art:
(1) with the circuit structure of the similar cascade high voltage transformer adjusting parts as STATCOM, do not connect motor load, the capacitance energy storage mode is still adopted in not speed governing, only realizes the STATCOM function.Existing mode has just adopted H bridge unit variable-frequency governor, still adopts big capacitance energy storage, and this kind circuit topology is storage capacitor and cascade unit variable-frequency governor only, can't realize the speed governing of motor, remains a kind of traditional STATCOM circuit in essence.
(2) carry out the frequency control of high-voltage motor with cascade high voltage transformer, uncontrollable device is adopted in input, can't realize the control of energy feedback and original edge voltage, does not have the function of STATCOM, only can realize electric machine speed regulation.
Summary of the invention
Defective at the prior art existence, the object of the invention is intended to propose a kind of high voltage frequency converter and control method and control system of the STATCOM of having function, adopt phase shifting transformer and AC-DC-AC to control the unit variable-frequency governor entirely, the load termination electric machine speed regulation, former edge joint electrical network carries out the reactive power compensation of electrical network; Can high-pressure frequency-conversion technology and reactive power compensation common technology, equipment is shared, create the incomparable advantages of isolated system such as higher, the whole cost of energy-saving efficiency is lower.
For achieving the above object, the technical scheme taked of the present invention is:
A kind of high voltage frequency converter with STATCOM function, it comprises the former limit of transformer that is connected with electrical network three-phase alternating current output, each winding of transformer secondary inserts each unit variable-frequency governor of concatenated frequency changer respectively, each unit variable-frequency governor output is the incoming transport motor load in the lump, every suit is equipped with several such unit variable-frequency governors, and each variable-frequency governor series connection back, unit forms high pressure and exports to load motor.
Above-mentioned individual unit variable-frequency governor promptly refers to a variable-frequency governor that adopts two-stage current transformer, the prime current transformer adopts IGBT impulse commutation circuit, back level current transformer is the H bridge inverter circuit, and a plurality of unit variable-frequency governor forms a phase in the series connection of inversion end, forms three-phase 10kV at last and exchanges output; The shared one group of transformer secondary winding of all unit variable-frequency governors of same phase wherein, phase shift between each winding in same group forms the multi-pulse rectification pattern.
The prime current transformer has the function of rectification and STATCOM concurrently in the high voltage frequency converter provided by the invention, reverse rectifier when afterwards the level current transformer is as inversion output device and energy feedback, provide DC power supply to prime from motor side, thereby the storage capacitor that has replaced existing STATCOM technical scheme has reached the effect of two kinds of functions of a set of equipment.The prime current transformer adopts the full-control type power device, not only do not need AC side that reactive power is provided, and can also in certain power bracket, export continuously adjustable perception or capacitive reactive power, the reactive power of dynamic compensation power supply grid bus, stable power-supplying electrical network busbar voltage; And because the active energy that will load under the braking situation is fed back to electrical network, further improve energy-saving effect, have characteristics such as energy-saving efficiency height, whole cost are low, help the popularization of power-saving technology.
Accordingly, the invention allows for a kind of control method based on above-mentioned high voltage frequency converter, when high voltage frequency converter carries out frequency control, the prime current transformer is as the full-controlled rectifier device, adopt the hysteresis current method, control the electric current and voltage of bus direct voltage and input, obtain the control impuls of IGBT device by the current hysteresis chain rate, PWM control is partly adopted in system's inversion, forms amplitude, the output voltage of frequency adjustable, electric current; When carrying out power back-off, by idle calculating, with the electric energy feedback,, control electrical network original edge voltage input value through an anti-AC-DC-AC converter from motor side, reach the purpose of power back-off.
The present invention is also based on DSP and CPLD hardware controls platform, a kind of control system that realizes above-mentioned control method has been proposed, comprise master controller, with its two-way up-computer that is connected and pulse distribution unit, master controller comprises signal processing unit, the signal gathering unit that is connected with signal processing unit and central controller, wherein master controller is connected with the pulse distribution unit by its inner signal gathering unit, and the pulse distribution unit is by the gate drive circuit in the photoelectrical coupler access main circuit.
Above-mentioned master controller receives given signals such as the given or predefined frequency of up-computer, voltage, calculate device for power switching to open/cut-off angles (constantly), the pulse distribution unit is as the interface of master controller and main circuit, the pulse distribution unit receives the main controller controls signal, after the decoding, export to gate drive circuit through photoelectrical coupler (optical fiber), opening and ending of control major loop switch element obtains needed voltage.Wherein adopt photoelectrical coupler to transmit the isolation that the trigger command signal is realized control system and power model, improved system safety and antijamming capability.On the other hand, the pulse distribution unit also receives the power device fault message of gate drive circuit feedback, blocks the drive signal of whole unit, and will give master controller behind the fault message coding.
The central controller of master controller adopts DSP2812, and gate drive circuit is carried out the control signal that master controller provides, and control IGBT turns on and off, and gives master controller with status signal, short-circuit protection signal feedback.Master controller by the control command of network communication line receiving center computer, is finished the operation of control command by the feedback signal of photoelectrical coupler reception gate pole driver element.
When system carries out power back-off, central controller in the master controller carries out idle calculating, finish the output voltage controlled function of this moment, the control impuls of the prime current transformer IGBT device of modulating unit then, distribute by CPLD, by the optical fiber transmission, finish switch control, reach the purpose of effective adjusting power factor.
The present invention forms dynamic power supplies by the dynamic rectification of cascade high voltage transformer four-quadrant-inversion process, supply with the high-voltage motor use by former limit electric energy being carried out the controlled electric energy of full-controlled rectifier-inversion output, also can realize the electric energy conversion of inverse process, be that former rectifying part (prime current transformer) becomes inverter, inversion part (back level current transformer) becomes rectifier, with the anti-former limit electrical network that returns to of electric energy, can reach the purpose of former limit reactive power compensation by control to the prime current transformer.When nonlinear load (asynchronous machine) was carried out speed governing, the dynamical feedback electric energy reached the purpose of reactive power compensation in the mode of four-quadrant rectifier feedback electric energy.
Native system has carried out state-of-the-art technology in high-pressure frequency-conversion and the reactive power compensation technology novelty, effectively integrated.Current transformer adopts the full-control type power device, the back electric energy of level current transformer under the braking situation can be fed back to electrical network, further improves energy-saving effect.
In sum, the present invention is on existing basis, with the energy feedback type high voltage converter of band STATCOM function when carrying out speed regualtion of AC motor and control, also realized the real-time no-power compensation function that STATCOM possessed, the idle and stable line voltage of impact that can the bucking-out system nonlinear load; Its energy-saving effect has surpassed high voltage converter and reactive power compensation energy-saving effect sum, and the synthesis energy saving index can reach more than 45%.And because two kinds of devices are integrated together, the saving of whole device materials total cost reaches more than 25%, greatly reduces material cost.
Description of drawings
Fig. 1 is the scheme schematic diagram that existing frequency converter is STATCOM;
Fig. 2 is the system block diagram of converter plant of the present invention;
Fig. 3 is the circuit topology figure of unit variable-frequency governor among Fig. 2;
Fig. 4 is prime current transformer control method during power back-off in the control method of the present invention;
Fig. 5 is a direct voltage outer shroud control method in the described method of Fig. 4;
Fig. 6 is a current inner loop control method in the described method of Fig. 4;
Fig. 7 is the structured flowchart of control system of the present invention.
Embodiment
As shown in Figure 2, at first, the three-phase alternating current of electrical network output enters the former limit of input phase-shifting rectifier transformer of cascade high voltage transformer, give each unit power supply of cascade high voltage transformer by each winding of transformer secondary, the adjustable electric current and voltage of unit output, the alternating current machine electric is given in the stack back.And can pass through the control of the energy feedback realization of motor-frequency converter-transformer circuit to original edge voltage and power, reach dynamic merit and mend free purpose.
As shown in Figure 3, Sa1, Sb1, Sc1 Sa1 ', Sb1 ', Sc1 ' is controlled electronic switching device entirely for the prime current transformer, and Su1, Sv1, Su1 ', Sv1 ' they are back level current transformer.Full control electronic switching device, L1 shoulders device for the input electricity, and R1 is an intermediate dc resistance, and C1 is provided with input LC filter for supporting electric capacity at the three phase mains input side.
Wherein above-mentioned each unit variable-frequency governor adopts the scheme of two-stage current transformer, and the prime current transformer adopts IGBT impulse commutation circuit, and back level current transformer is the H bridge inverter circuit.The prime current transformer has been taken into account the function of PWM rectifier and STATCOM (STATCOM), and back level current transformer is a high voltage frequency converter.As Fig. 3, the prime current transformer is a three-phase full-controlled rectifier bridge, with the power supply AC rectification is direct current, then reach the purpose of controlled inversion output by back level current transformer, output to the stator side of asynchronous machine after output superposes to the unit simultaneously again, by can carry out simultaneously the power back-off on former limit to the control of prime current transformer, such system can reach when controlling asynchronous machine in real time, also can carry out the purpose of former limit power back-off.
The current transformer of element circuit part " oppositely " wherein, promptly from motor side with the electric energy feedback, through an anti-AC-DC-AC converter, control electrical network original edge voltage input value, reach the purpose of power back-off.
Control block diagram such as Fig. 4: wherein vs, is are the power end voltage and current; Ic is the compensator output current, and α is the phase angle difference of load voltage and electric current;
Be the dc bus reference voltage, V
DcBe the dc bus virtual voltage,
It is the dc bus reference voltage;
Reactive current; Vc is the compensation output voltage.
When system carries out power back-off, by idle calculating: Q=V
sI
sSin α.
Shown in Fig. 5 control strategy, in system's output and dc terminal voltage sensor, current sensor are housed, send control system with voltage, the current signal of gathering, handle and control by control system, reach the purpose of voltage stabilizing, constant current.
When system carried out frequency control, the prime current transformer adopted the control of hysteresis current method as the full-controlled rectifier device, and this control method adopts the dicyclo control of outer voltage and current inner loop.Outer voltage is a control three-phase VSC dc voltage; And the effect of current inner loop is to carry out the control of current transformer input current according to the current reference value of outer voltage output.
For the three-phase alternating current symmetrical system, suppose and only consider to exchange fundametal compoment that then the dq component in the stable state dqo model is the direct current variable.Overlap with electrical network electromotive force vector by the d axle initial reference direction of principal axis of choosing synchronous rotating frame, the AC system A phase phase voltage starting phase angle that is current transformer is 0 degree, then the d shaft current is represented the real component of electric current, and the q shaft current is represented the idle component of electric current, controls i respectively
dAnd i
qJust can reach the purpose of the meritorious and reactive power of control stable state.When system uses as the ice-melt DC power supply, system operates in the unity power factor state, and the reactive power of AC side output in other words is 0, therefore only needs the control of design active power, because adopt constant current chopper output, converter cell adopts dc voltage controller.
Direct voltage outer shroud control method as shown in Figure 5, u among the figure
Dc,
Δ u
Dc 
Be respectively direct voltage actual value, direct voltage set-point, direct current voltage error value and direct current set-point.Direct voltage u
DcWith the direct voltage reference value
Departure Δ u
DcBe converted to alternating current real component i through the PI link
dCorrection i
D1, provide i by power feedforward link
dPre-appraisal i
D0, both sums have constituted the given reference value of the real component of the meritorious input current of current transformer
Thereby, remove to control the direct voltage of current transformer.If the controlled quentity controlled variable of current transformer
Only be stable state discreet value i
D0, then current transformer voltage open loop operation, direct voltage is no longer kept constant but is fluctuateed along with the variation of burden with power load or burden without work at this moment.
The current inner loop control method as shown in Figure 6, with current i
d, i
qRespectively with set-point
Compare and carry out after the PI control, utilize the feedforward decoupling algorithm, obtain the dq component of current transformer modulation voltage.Pass through u
DqAnd the resulting phase signal of phase-locked loop, just can carry out three-phase SPWM modulation or SVPWM modulation, obtain the start pulse signal of the IGBT element of current transformer.
As shown in Figure 6, the electric current and voltage of control bus direct voltage and input obtains the control impuls of IGBT device by the current hysteresis chain rate, and PWM control is partly adopted in system's inversion, can form output voltage, the electric current of amplitude, frequency adjustable.
As shown in Figure 7, master controller receives given signals such as the given or predefined frequency of up-computer, voltage, data after obtaining handling by signal gathering unit and processing unit, calculate device for power switching to open/cut-off angles (constantly), for example can use ripe SVPWM (space vector modulation) method, reach the purpose of control output pulse by control azimuth and amplitude.
The pulse distribution unit is made up of the digitlization logical circuit, and by the programming of hardware being finished the coding of switching signal, transmission is decoded, and finishes the communication between master controller and each power cell.As the interface of master controller and main circuit, the pulse distribution unit receives the main controller controls signal, exports to gate drive circuit through photoelectrical coupler (optical fiber), and opening and ending of control major loop switch element obtains needed voltage.On the other hand, the pulse distribution unit also receives the power device fault message of arrival gate drive circuit feedback, blocks the drive signal of whole unit, and will give master controller behind the fault message coding.
The central controller of master controller inside adopts the digital hardware platform of DSP2812 and CPLD, and the control signal that master controller provides is carried out in the gate-drive unit, and control IGBT turns on and off, and gives master controller with status signal, short-circuit protection signal feedback.Master controller by the control command of network communication line receiving center computer, is finished the operation of control command by the feedback signal of optical fiber reception gate pole driver element.
System can carry out the priority design at the need capacity of system in frequency control and power back-off when operation, under the situation of not influence system output, coordinate control by last microcomputer.
Claims (4)
1, a kind of high voltage frequency converter with STATCOM function, it is characterized in that comprising the former limit of transformer that is connected with electrical network three-phase alternating current output, each winding of transformer secondary inserts each unit variable-frequency governor of concatenated frequency changer respectively, and each unit variable-frequency governor output is the incoming transport motor load in the lump; Wherein said unit variable-frequency governor is a variable-frequency governor that adopts two-stage current transformer, the prime current transformer adopts IGBT impulse commutation circuit, back level current transformer is the H bridge inverter circuit, and a plurality of unit variable-frequency governor forms a phase in the series connection of inversion end, forms three-phase 10kV at last and exchanges output; The shared one group of transformer secondary winding of all unit variable-frequency governors of same phase wherein, phase shift between each winding in same group forms the multi-pulse rectification pattern.
2, a kind of control method based on the described high voltage frequency converter of claim 1, it is characterized in that, when high voltage frequency converter carries out frequency control, the prime current transformer is as the full-controlled rectifier device, adopt the hysteresis current method, control the electric current and voltage of bus direct voltage and input, obtain the control impuls of IGBT device by the current hysteresis chain rate, PWM control is partly adopted in system's inversion, forms amplitude, the output voltage of frequency adjustable, electric current; When carrying out power back-off, by idle calculating, with the electric energy feedback,, control electrical network original edge voltage input value through an anti-AC-DC-AC converter from motor side, reach the purpose of power back-off.
3, a kind of control system that realizes the described control method of claim 2, it is characterized in that comprising master controller, with its two-way up-computer that is connected and pulse distribution unit, master controller comprises signal processing unit, the signal gathering unit that is connected with signal processing unit and central controller, wherein master controller is connected with the pulse distribution unit by its inner signal gathering unit, and the pulse distribution unit is by the gate drive circuit in the photoelectrical coupler access main circuit.
According to the control system of the control method of the described realization high voltage frequency converter of claim 3, it is characterized in that 4, the central controller of described master controller adopts DSP2812.
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| CNA200810143438XA CN101499728A (en) | 2008-10-29 | 2008-10-29 | High voltage frequency conversion apparatus having STATCOM function, control method and control apparatus |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101783597A (en) * | 2010-03-31 | 2010-07-21 | 山东新风光电子科技发展有限公司 | Dynamic reactive compensation device based on direct current side active structure and amplitude adjustment control |
| CN102723863A (en) * | 2011-03-30 | 2012-10-10 | 上海三菱电梯有限公司 | Non-isolated bi-directional DC-DC converter control method |
| CN103199547A (en) * | 2013-03-29 | 2013-07-10 | 湖南大学 | Pulse-width modulation (PWM) rectifier and static synchronous compensator combined operation system and control method thereof |
| CN103715914A (en) * | 2012-10-08 | 2014-04-09 | 北京动力源科技股份有限公司 | Controllable rectifier/inverter control method with power feed-forward, controllable rectifier/inverter control device with power feed-forward and high-voltage frequency converter |
| CN104362655A (en) * | 2014-12-10 | 2015-02-18 | 国家电网公司 | Unbalanced load compensation device and compensation method |
| CN105429492A (en) * | 2015-11-30 | 2016-03-23 | 北京赛思亿电气科技有限公司 | PWM control system applicable to middle or high voltage converter and control method of PWM control system |
| CN105763069A (en) * | 2016-02-29 | 2016-07-13 | 珠海格力电器股份有限公司 | Voltage regulation system and method |
| CN107395028A (en) * | 2017-07-26 | 2017-11-24 | 贵州电网有限责任公司电力科学研究院 | The unit cascaded type high-power high-frequency high-voltage ice-melt excitation power supply circuit of full-controlled device |
| CN108667037A (en) * | 2018-04-25 | 2018-10-16 | 安徽工程大学 | STATCOM/BESS micro-capacitance sensors cooperative control method based on P-DPC and its system |
| CN113381414A (en) * | 2021-06-18 | 2021-09-10 | 国网湖南省电力有限公司 | Multi-mode comprehensive control method of dynamic voltage restorer based on super capacitor energy storage |
| CN114294151A (en) * | 2021-12-09 | 2022-04-08 | 武汉大学 | Combined regulating and controlling system and method for speed regulator and converter of stepless speed change pumped storage power station |
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- 2008-10-29 CN CNA200810143438XA patent/CN101499728A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101783597A (en) * | 2010-03-31 | 2010-07-21 | 山东新风光电子科技发展有限公司 | Dynamic reactive compensation device based on direct current side active structure and amplitude adjustment control |
| CN102723863A (en) * | 2011-03-30 | 2012-10-10 | 上海三菱电梯有限公司 | Non-isolated bi-directional DC-DC converter control method |
| CN102723863B (en) * | 2011-03-30 | 2014-12-10 | 上海三菱电梯有限公司 | Non-isolated bi-directional DC-DC converter control method |
| CN103715914B (en) * | 2012-10-08 | 2016-11-23 | 北京动力源科技股份有限公司 | Controlled rectification/the inversion controlling method of a kind of band power feedforward, device and a kind of high voltage converter |
| CN103715914A (en) * | 2012-10-08 | 2014-04-09 | 北京动力源科技股份有限公司 | Controllable rectifier/inverter control method with power feed-forward, controllable rectifier/inverter control device with power feed-forward and high-voltage frequency converter |
| CN103199547A (en) * | 2013-03-29 | 2013-07-10 | 湖南大学 | Pulse-width modulation (PWM) rectifier and static synchronous compensator combined operation system and control method thereof |
| CN103199547B (en) * | 2013-03-29 | 2014-03-05 | 湖南大学 | Control method of pulse-width modulation (PWM) rectifier and static synchronous compensator combined operation system |
| CN104362655A (en) * | 2014-12-10 | 2015-02-18 | 国家电网公司 | Unbalanced load compensation device and compensation method |
| CN105429492A (en) * | 2015-11-30 | 2016-03-23 | 北京赛思亿电气科技有限公司 | PWM control system applicable to middle or high voltage converter and control method of PWM control system |
| CN105763069A (en) * | 2016-02-29 | 2016-07-13 | 珠海格力电器股份有限公司 | Voltage regulation system and method |
| CN107395028A (en) * | 2017-07-26 | 2017-11-24 | 贵州电网有限责任公司电力科学研究院 | The unit cascaded type high-power high-frequency high-voltage ice-melt excitation power supply circuit of full-controlled device |
| CN108667037A (en) * | 2018-04-25 | 2018-10-16 | 安徽工程大学 | STATCOM/BESS micro-capacitance sensors cooperative control method based on P-DPC and its system |
| CN108667037B (en) * | 2018-04-25 | 2022-02-15 | 安徽工程大学 | STATCOM/BESS microgrid cooperative control method and system based on P-DPC |
| CN113381414A (en) * | 2021-06-18 | 2021-09-10 | 国网湖南省电力有限公司 | Multi-mode comprehensive control method of dynamic voltage restorer based on super capacitor energy storage |
| CN113381414B (en) * | 2021-06-18 | 2022-08-23 | 国网湖南省电力有限公司 | Multi-mode comprehensive control method of dynamic voltage restorer based on super capacitor energy storage |
| CN114294151A (en) * | 2021-12-09 | 2022-04-08 | 武汉大学 | Combined regulating and controlling system and method for speed regulator and converter of stepless speed change pumped storage power station |
| CN114294151B (en) * | 2021-12-09 | 2022-10-04 | 武汉大学 | Combined regulating and controlling system and method for speed regulator and converter of stepless speed change pumped storage power station |
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Inventor after: Jing Huabing Inventor after: Huang Yanyan Inventor after: Zhou Xiwen Inventor after: Li Jun Inventor after: Wang Weian Inventor after: Wang Xiaofang Inventor after: Yuan Guangjun Inventor before: Jing Huabin Inventor before: Huang Yanyan Inventor before: Zhou Xiwen Inventor before: Li Jun Inventor before: Wang Weian Inventor before: Wang Xiaofang Inventor before: Yuan Guangjun |
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Free format text: CORRECT: INVENTOR; FROM: JING HUABIN HUANG YANYAN ZHOU XIWEN LI JUN WANG WEIAN WANG XIAOFANG YUAN GUANGJUN TO: JING HUABING HUANG YANYAN ZHOU XIWEN LI JUN WANG WEIAN WANG XIAOFANG YUAN GUANGJUN |
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Application publication date: 20090805 |