CN102983754B - Parallel variable frequency power supply for high power and high voltage test - Google Patents
Parallel variable frequency power supply for high power and high voltage test Download PDFInfo
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Abstract
The invention discloses a parallel variable frequency power supply for a high power and high voltage test, and belongs to the technical field of electric systems. The parallel variable frequency power supply comprises two or more parallel variable frequency power supply parts with current limiting reactors. The parallel variable frequency power supply solves the problem that a main variable frequency power supply controller decodes falsely due to the fact that the signal transmission quantity of optical fiber communication is large when two or more power supplies run in parallel; the parallel variable frequency power supply ensures that asynchronism of output voltage of the parallel variable frequency power supplies is controlled within 1 microsecond; the output synchronism of the variable frequency power supplies is improved; and circular current of output among the power supply parts is realized. In addition, as guard signals are arranged among a main variable frequency power supply and slave variable frequency power supplies, the deficiency in the prior art that when remedial operation cannot be conducted when the variable frequency power supplies fail is overcome.
Description
Technical field
What the present invention relates to is a kind of device of technical field of power systems, the specifically no partial discharge frequency conversion power supply of a kind of double parallel, the Field AC Withstand Voltage Test that can be used for below 1000kV electric pressure GIS, the non-local discharge test of the following main transformer of 500kV electric pressure and the AC voltage withstand test of long-distance cable.
Background technology
Along with the fast development of national economy, the electric pressure of electric power conveying is more and more higher, its capacity is also increasing, therefore the reliability of equipment for power transmission and distribution and transmission cable is had higher requirement, also the capacity of the variable frequency power supply of AC voltage withstand test is carried out to it and power is had higher requirement.
The capacity of the separate unit variable frequency power supply that present domestic market has cannot meet the test of this type of equipment for power transmission and distribution and transmission cable, even if useful parallel variable frequency power supply, but due to system circulation or export nonsynchronous reason, make the variable frequency power supply used in parallel also unstable, even also can have influence on the stability of system.
Prior art literature search is found, Chinese patent literature CN202103582U, day for announcing 2012-01-04, describe a kind of " parallel without partial discharge frequency conversion boosting power device ", disclose a kind of frequency conversion boosting power device of parallel connection, the paralleling model that the two input windings that the output that have employed two variable frequency power supplys receives separate unit excitation transformer respectively realize, achieves the superposition of power.But above-mentioned technology does not relate to and can produce larger DC excitation when two variable frequency power supplys export asynchronous to the former limit of excitation transformer, when DC excitation is very large, can shove in the former limit of excitation transformer, core sataration, time serious, excitation transformer can burn, system crash, entail dangers to is to people, the equipment even safety of electrical network, and this technology any of cannot realize between two frequency converters remedies control method when breaking down, therefore, on the paralleling model of variable frequency power supply, the output asynchronism of two variable frequency power supplys and the problem of circulation must be solved.
Chinese patent literature CN102545640A, publication date: 20120704, describe one " flexible frequency conversion device ", this technology is made up of two high voltage converters, wherein one serves as primary transducer, remaining serves as from frequency converter, the output of the inversion circuit of primary transducer is by interlocking switch QF3, synchronous reactance L be respectively connected from the output of the inversion circuit of high voltage converter, primary transducer by interlocking switch QF1 with respectively connect mutually from the inversion circuit of frequency converter, respectively connected from the central point side point of the inversion circuit of frequency converter by interlocking switch QF2, when interlocking switch QF2 closes, form the central point of each inversion circuit, controller in primary transducer with set up communication from the controller in frequency converter and be connected, controller in primary transducer sends modulation signal, control is carried out to primary transducer with from frequency converter, each frequency converter is ensured on space vector PWM modulation controls consistent, main to ensure, from the output frequency of frequency converter, output voltage, phase place is consistent.But the optical-fibre communications that this technology does not relate between principal and subordinate's variable frequency power supply can be too many due to signal transmission kind, easily cause the misunderstanding code of master-slave controller, even can cause the false triggering of IGBT, there is the accidents such as bombing, as accidents such as the IGBT not taking corresponding control method or can cause because of the reason of optical-fibre communications misunderstanding code burn when simultaneously the IGBT of this patent also not mentioned any variable frequency power supply when principal and subordinate's frequency converter between breaks down, therefore, the selection being connected in parallel on control mode of two variable frequency power supplys must be considered comprehensively.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of high-power high voltage test variable frequency power supply of parallel connection is proposed, adopt the technology of IGBT drive singal Optical Fiber Transmission between the control of main transformer frequency power and principal and subordinate's variable frequency power supply, avoid the problem causing the misunderstanding code of main variable frequency power controller because optical fiber communication signal transmission amount when two or the operation of multiple stage power sources in parallel is large, the asynchronism of the variable frequency power supply output voltage of multiple stage parallel connection is made to control in 1 μ s, both improve the synchronism that multiple variable frequency power supply exports, solve again the circulation problem between the output of multiple power supply, pass through master simultaneously, between variable frequency power supply, guard signal is set, solve the defect that cannot realize corrective operation when multiple stage variable frequency power supply being broken down in prior art.
The present invention is achieved by the following technical solutions, the present invention includes: the variable frequency power supply with current limiting reactor of two or more sets parallel connections, wherein: the output of main transformer frequency power is connected with the input of main current limiting reactor and transmits the voltage and current signal that main transformer frequency power exports, output from variable frequency power supply is connected with the input from current limiting reactor and transmits the voltage and current signal exported from variable frequency power supply, two outputs of main current limiting reactor are connected with two outputs from current limiting reactor and transmit voltage and the electric current of the variable frequency power supply after parallel connection, the output of the current limiting reactor after two parallel connections is connected with the former limit of excitation transformer to be measured, the optical fiber port of main transformer frequency power is directly connected with the optical fiber port from variable frequency power supply and transmits the drive singal of IGBT and guard signal and realizes drive singal zero propagation and transmit.
Described drive singal zero propagation transmission refers to: by drive singal and the guard signal of optical fiber shunt circuit transmission IGBT, namely the optical fiber transmit port of main transformer frequency power is connected with the light receiver port from variable frequency power supply and transmits IGBT drive singal; To be connected with the receiving port of main transformer frequency power from the optical fiber transmit port of variable frequency power supply and to transmit guard signal.
Described variable frequency power supply is built-in with: electric light/photoelectric conversion module group, for gathering the controller of all feedback signals from variable frequency power supply and parallel system boosting parameter and the parallel signal processing module that is made up of shunt module and multichannel guard signal processing module, wherein: be set to closed condition from the controller of variable frequency power supply, main transformer frequency power controls the operation from variable frequency power supply, the controller of main transformer frequency power exports a road IGBT drive singal, through shunt module this IGBT drive singal be divided into multichannel and generate multi-channel optical fibre signal through electric light/photoelectric conversion module group and transfer to main transformer frequency power respectively with each from variable frequency power supply, multichannel guard signal processing module receives the guard signal exported from each IGBT module from variable frequency power supply, after Logic judgment, generating interrupt signal when breaking down and exporting the controller of main transformer frequency power to, when the controller of main transformer frequency power has detected that interrupt signal occurs, stop the output of all power supplys immediately and automatic brake separating, carry out specifically judging from the error protection of variable frequency power supply according to the interrupt signal received, and be shown on liquid crystal display screen.
Described current limiting reactor is used for preventing the sudden change of electric current, and inhibit the circulation produced between principal and subordinate's variable frequency power supply, all play a protective role to principal and subordinate's variable frequency power supply and test product, this reactor is 50 μ H single-phase reactors;
Described multi-channel optical fibre signal comprises: main transformer frequency power sends to the IGBT drive singal of master and slave variable frequency power supply and transmits the guard signal of returning by IGBT.
The IGBT drive singal that main transformer frequency power sends by described parallel signal processing module is N road by electric light/photoelectric conversion module component road after electro-optic conversion, N is variable frequency power supply sum, wherein riches all the way gives main transformer frequency power, remaining N-1 road drive singal sends to each from variable frequency power supply, to ensure the synchronism of the IGBT drive singal that principal and subordinate's variable frequency power supply sends.
Described guard signal refers to: when the IGBT of a power supply any in master and slave variable frequency power supply occur as overcurrent, temperature anomaly and voltage rise too soon fault time the alarm signal that sends; this guard signal is low level when IGBT normally works, and then becomes high level from low level when operation irregularity occurs IGBT.
Described multichannel guard signal processing module receives the guard signal of the IGBT module of N number of variable frequency power supply; N is variable frequency power supply sum; send the controller of interrupt signal to main transformer frequency power when breaking down after Logic judgment; the IGBT module of now abnormal variable frequency power supply has stopped exporting; the controller of main transformer frequency power, once receive interrupt signal, stops the output of all power supplys and automatic brake separating, and according to interrupt signal judge to break down from variable frequency power supply.
Described interrupt signal is a hexadecimal 0x0000 character, when central word break character is 0x01, for main transformer frequency power IGBT is abnormal; When central word break character is 0x0i, be that the i-th-No. 1 IGBT from variable frequency power supply is abnormal, i is the natural constant within N; When central word break character is 0xf1, it is variable frequency power supply overcurrent protection; When central word break character is 0xf2, it is the overvoltage protection of variable frequency power supply; When central word break character is 0xf3, it is the open-phase protection of variable frequency power supply; When central word break character is 0xf4, it is the discharge prevention of variable frequency power supply.
The present invention carries out work in the following manner: when system electrification is started shooting, all first principal and subordinate's variable frequency power supply carries out self-inspection, can operate when confirming system failure and alarm free.After self-inspection completes, the control circuit of main transformer frequency power transmits control signal and drive singal to from variable frequency power supply, in running, when a variable frequency power supply any in principal and subordinate's variable frequency power supply has abnormal all to main transformer frequency power transmission guard signal, main transformer frequency power response protection, cuts off and exports; Main transformer frequency power shows running status and the guard mode of two power supplys, is connected to load after current limiting reactor parallel connection, provides test voltage and electric current to load.
Technique effect
The present invention is by using two variable frequency power supply parallel connections, achieve power and capacity boost, meet the demand of high-power withstand voltage test, and every separate unit power supply architecture control mode is constant, and save the control of a power supply, will wherein one as main frame, the IGBT that main frame is responsible for controlling slave two variable frequency power supplys exports, the sending and the protection of two power supplys of control signal;
The present invention adopts main transformer frequency power to control and increases the technology of single-phase current limiting reactor, master and slave variable frequency power supply is exported be connected with corresponding single-phase current limiting reactor respectively, the parallel connection of two variable frequency power supplys is realized by the output parallel connection of single-phase current limiting reactor, finally receive the former limit of excitation transformer, so both achieved the lifting of rear frequency changing power device capacity in parallel and power, solve again the former limit of excitation transformer two can due to the asynchronous of input the phenomenon such as shoving of causing and iron core cutter, also comprise following technique effect simultaneously:
1) when can realize any power failure, all power supplys quit work and separating brake all immediately, and judge through the program of main power source, are shown as which kind of protection, protect equipment, the system even safety of electrical network;
2) by two parallel connections without office's discharge source are used, two power supplys after parallel connection still meet the requirement of putting without office, after tested, the office of the principal and subordinate's variable frequency power supply after parallel connection is high-volume 5Pc, makes the non-local discharge test of the following main transformer of 500kV electric pressure smooth;
3) mode of Optical Fiber Transmission is adopted by slave IGBT drive singal, one road drive singal is divided into N road, wherein riches all the way gives main transformer frequency power, remaining N-1 road drive singal sends to each from variable frequency power supply, achieve the IGBT module parallel between different variable frequency power supply, solve the synchronism problem of IGBT parallel connection in domestic experiment power supply industry, power supply after two variable frequency power supply parallel connections is exported synchronism and obtains effective control, after tested, the synchronism control of two variable frequency power supplys outputs is within 1 μ s;
4) variable frequency power supply output port connects current limiting reactor, suppresses the circulation produced between two variable frequency power supplys, carries out filtering simultaneously to output waveform, improve the output waveform quality of variable frequency power supply;
5) structure of principal and subordinate's variable frequency power supply inside is the same, and any one all can be used alone, and under different Parallel test conditions any one all can be used as the work of main transformer frequency power, do not exist and a variable frequency power supply of specifying must be used as main transformer frequency power.
Accompanying drawing explanation
Fig. 1 is present system structural representation.
Fig. 2 is separate unit variable frequency power supply structural representation.
Fig. 3 is the abnormal protection decision flow chart of main transformer frequency power.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment
As shown in Figure 1; this power supply comprises: main transformer frequency power 1, from variable frequency power supply 2, optical fiber shunt circuit 3, main current limiting reactor 4 and from current limiting reactor 5; wherein: main transformer frequency power 1 and being connected by optical fiber shunt circuit 3 between variable frequency power supply 2; the control circuit of main transformer frequency power 1 is transmitted control signal and drive singal to from variable frequency power supply 2 by optical fiber shunt circuit 3; send guard signal from variable frequency power supply 2 to main transformer frequency power 1, the liquid crystal display screen of main transformer frequency power 1 shows operation and the protection of two power supplys.The output out1 of main transformer frequency power 1 meets the input IN1 of main current limiting reactor 4, and the output out2 of main transformer frequency power 1 meets the input IN2 of main current limiting reactor 4; Meet the input IN1 from current limiting reactor 5 from the output out1 of variable frequency power supply 2, meet the input IN2 from current limiting reactor 5 from the output out2 of variable frequency power supply 2; The output a1 of main current limiting reactor 4 is connected as cathode output end O+ with the output a2 from current limiting reactor 5; The output x1 of main current limiting reactor 4 is connected as cathode output end O-with the output x2 from current limiting reactor 5; Cathode output end O+ and cathode output end O-connects load.
Described optical fiber shunt circuit 3 adopts many group optical fiber transmission line compositions, the drive singal of prevailing transmission main transformer frequency power and control signal, and the guard signal to transmit from variable frequency power supply to main transformer frequency power, it is one group with 3, namely if two power sources in parallel then need two groups of optical fiber, N group is in parallel in this way, then need 2N group optical fiber;
Described current limiting reactor 4 and current limiting reactor 5 mainly suppress the sudden change of electric current, and parameter is identical, is used for Load transportation test voltage and test current.
As shown in Figure 2, described variable frequency power supply is built-in with: electric light/photoelectric conversion module group, for gathering the controller of all feedback signals from variable frequency power supply and parallel system boosting parameter and the parallel signal processing module that is made up of shunt module and multichannel guard signal processing module, wherein: be set to closed condition from the controller of variable frequency power supply, main transformer frequency power controls the operation from variable frequency power supply, the controller of main transformer frequency power exports a road IGBT drive singal, through shunt module this IGBT drive singal be divided into multichannel and generate multi-channel optical fibre signal through electric light/photoelectric conversion module group and transfer to main transformer frequency power respectively with each from variable frequency power supply, multichannel guard signal processing module receives the guard signal exported from each IGBT module from variable frequency power supply, after Logic judgment, generating interrupt signal when breaking down and exporting the controller of main transformer frequency power to, when the controller of main transformer frequency power has detected that interrupt signal occurs, stop the output of all power supplys immediately and automatic brake separating, carry out specifically judging from the error protection of variable frequency power supply according to the interrupt signal received, and be shown on liquid crystal display screen.
As shown in Figure 3, described interrupt signal is a hexadecimal 0x0000 character, when central word break character is 0x01, for main transformer frequency power IGBT is abnormal; When central word break character is 0x0i, be that the i-th-No. 1 IGBT from variable frequency power supply is abnormal, i is the natural constant within N; When central word break character is 0xf1, it is variable frequency power supply overcurrent protection; When central word break character is 0xf2, it is the overvoltage protection of variable frequency power supply; When central word break character is 0xf3, it is the open-phase protection of variable frequency power supply; When central word break character is 0xf4, it is the discharge prevention of variable frequency power supply.
This enforcement carries out work especially by with under type: when system electrification is started shooting, all first principal and subordinate's variable frequency power supply carries out self-inspection, can operate when confirming system failure and alarm free.After self-inspection completes, the control circuit of main transformer frequency power transmits control signal and drive singal to from variable frequency power supply, in running, when a variable frequency power supply any in principal and subordinate's variable frequency power supply has abnormal all to main transformer frequency power transmission guard signal, main transformer frequency power response protection, cuts off and exports; Main transformer frequency power shows running status and the guard mode of two power supplys, is connected to load after current limiting reactor parallel connection, provides test voltage and electric current to load.
Claims (1)
1. a high-power high voltage test variable frequency power supply in parallel, it is characterized in that, comprise: the variable frequency power supply with current limiting reactor of two or more sets parallel connections, wherein: the output of main transformer frequency power is connected with the input of main current limiting reactor and transmits the voltage and current signal that main transformer frequency power exports, output from variable frequency power supply is connected with the input from current limiting reactor and transmits the voltage and current signal exported from variable frequency power supply, two outputs of main current limiting reactor are connected with two outputs from current limiting reactor and transmit voltage and the electric current of the variable frequency power supply after parallel connection, the output of the current limiting reactor after two parallel connections is connected with the former limit of excitation transformer to be measured, the optical fiber port of main transformer frequency power is directly connected with the optical fiber port from variable frequency power supply and transmits the drive singal of IGBT and guard signal and realizes drive singal zero propagation and transmit,
Described drive singal zero propagation transmission refers to: by drive singal and the guard signal of optical fiber shunt circuit transmission IGBT, namely the optical fiber transmit port of main transformer frequency power is connected with the light receiver port from variable frequency power supply and transmits IGBT drive singal; To be connected with the receiving port of main transformer frequency power from the optical fiber transmit port of variable frequency power supply and to transmit guard signal;
Described variable frequency power supply is built-in with: electric light/photoelectric conversion module group, for gathering the controller of all feedback signals from variable frequency power supply and parallel system boosting parameter and the parallel signal processing module that is made up of shunt module and multichannel guard signal processing module, wherein: be set to closed condition from the controller of variable frequency power supply, main transformer frequency power controls the operation from variable frequency power supply, the controller of main transformer frequency power exports a road IGBT drive singal, through shunt module this IGBT drive singal be divided into multichannel and generate multi-channel optical fibre signal through electric light/photoelectric conversion module group and transfer to main transformer frequency power respectively with each from variable frequency power supply, multichannel guard signal processing module receives the guard signal exported from each IGBT module from variable frequency power supply, after Logic judgment, generating interrupt signal when breaking down and exporting the controller of main transformer frequency power to, when the controller of main transformer frequency power has detected that interrupt signal occurs, stop the output of all power supplys immediately and automatic brake separating, carry out specifically judging from the error protection of variable frequency power supply according to the interrupt signal received, and be shown on liquid crystal display screen,
Described current limiting reactor is used for preventing the sudden change of electric current, and inhibit the circulation produced between principal and subordinate's variable frequency power supply, all play a protective role to principal and subordinate's variable frequency power supply and test product, this reactor is 50 μ H single-phase reactors;
The IGBT drive singal that main transformer frequency power sends by described parallel signal processing module is N road by electric light/photoelectric conversion module component road after electro-optic conversion, N is variable frequency power supply sum, wherein riches all the way gives main transformer frequency power, remaining N-1 road drive singal sends to each from variable frequency power supply, to ensure the synchronism of the IGBT drive singal that principal and subordinate's variable frequency power supply sends;
Described guard signal refers to: when the IGBT of a power supply any in master and slave variable frequency power supply occur as overcurrent, temperature anomaly and voltage rise too soon fault time the alarm signal that sends, this guard signal is low level when IGBT normally works, and then becomes high level from low level when operation irregularity occurs IGBT;
Described multichannel guard signal processing module receives the guard signal of the IGBT module of N number of variable frequency power supply, N is variable frequency power supply sum, send the controller of interrupt signal to main transformer frequency power when breaking down after Logic judgment, the IGBT module of now abnormal variable frequency power supply has stopped exporting, the controller of main transformer frequency power, once receive interrupt signal, stops the output of all power supplys and automatic brake separating, and according to interrupt signal judge to break down from variable frequency power supply;
Described interrupt signal is a hexadecimal 0x0000 character, when central word break character is 0x01, for main transformer frequency power IGBT is abnormal; When central word break character is 0x0i, be that the i-th-No. 1 IGBT from variable frequency power supply is abnormal, i is the natural constant within N; When central word break character is 0xf1, it is variable frequency power supply overcurrent protection; When central word break character is 0xf2, it is the overvoltage protection of variable frequency power supply; When central word break character is 0xf3, it is the open-phase protection of variable frequency power supply; When central word break character is 0xf4, it is the discharge prevention of variable frequency power supply.
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| CN103499779A (en) * | 2013-10-17 | 2014-01-08 | 国家电网公司 | UHV (Ultra High Voltage) transformer field variable frequency partial discharge test device |
| CN105098716B (en) * | 2015-07-31 | 2018-08-28 | 深圳市禾望电气股份有限公司 | Crowbar control units, system and method |
| CN107240915B (en) * | 2016-03-29 | 2019-10-18 | 西门子工厂自动化工程有限公司 | Shore electric power system |
| CN109818486B (en) * | 2017-11-20 | 2020-09-29 | 维谛技术有限公司 | Frequency converter thermal redundancy control method and redundancy frequency converter device |
| CN108173260A (en) * | 2017-12-22 | 2018-06-15 | 固纬电子(苏州)有限公司 | Multichannel power source combination control system |
| CN110058063A (en) * | 2019-05-17 | 2019-07-26 | 国网江苏省电力有限公司电力科学研究院 | A kind of high capacity variable-frequency power sources parallel operation control system |
| CN110504686A (en) * | 2019-09-20 | 2019-11-26 | 广东华邦创科智能技术有限公司 | Single phase ac power frequency intelligent protection safety power supply |
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| CN2840508Y (en) * | 2005-06-29 | 2006-11-22 | 闫克平 | High frequency high voltage DC power supply for electric dust-cleaner |
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| US7764041B2 (en) * | 2007-01-22 | 2010-07-27 | Johnson Controls Technology Company | System and method to extend synchronous operation of an active converter in a variable speed drive |
| CN101873611A (en) * | 2009-04-24 | 2010-10-27 | 北京东方信联科技有限公司 | System and method for accessing and distributing various mobile network signals in user net area |
| CN201467063U (en) * | 2009-09-01 | 2010-05-12 | 上海艾帕电力电子有限公司 | Parallel system of high-voltage frequency converters |
| CN101819430B (en) * | 2010-01-28 | 2012-07-04 | 中电电气(江苏)股份有限公司 | Fault signal processing system of high-voltage frequency converter controller and working method thereof |
| CN202103582U (en) * | 2011-07-01 | 2012-01-04 | 苏州华电电气股份有限公司 | Parallel variable-frequency boosting power supply device without partial discharge |
| CN203039594U (en) * | 2012-12-27 | 2013-07-03 | 思源电气股份有限公司 | Parallel variable frequency power supply for large power high voltage test |
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Effective date of registration: 20191219 Address after: 201108 building 3 and 4, No. 4399, Jindu Road, Minhang District, Shanghai Patentee after: Shanghai Sieyuan Opti-Electronic Co., Ltd. Address before: 201108, No. 4399 Jin Du Road, Shanghai, Minhang District Patentee before: Siyuan Electric Co., Ltd. |