CN103532444A - Large-scale impact power generation device group frequency conversion starting device - Google Patents
Large-scale impact power generation device group frequency conversion starting device Download PDFInfo
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- CN103532444A CN103532444A CN201310212204.7A CN201310212204A CN103532444A CN 103532444 A CN103532444 A CN 103532444A CN 201310212204 A CN201310212204 A CN 201310212204A CN 103532444 A CN103532444 A CN 103532444A
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Abstract
The invention discloses a large-scale impact power generation group frequency conversion starting device, and belongs to the field of mechanical equipment. An impact power generation device is also called a short circuit power generation device which is used for providing heavy short circuit current for a high-voltage switch and a transformer to perform type tests. Soft starting of a high-voltage asynchronous motor is a difficult point in the project. Formerly, a loop of a motor rotor is connected in series with multiple paths of resistors, and each path of resistor is connected gradually in a shorting way in the starting process so that soft starting is realized. The scheme is high in device investment, low in operation efficiency, large in operation maintenance amount and not high in control accuracy, and cannot provide 60Hz operation working state. In order to solve defects in the prior art, the invention provides the large-scale impact power generation device group frequency conversion starting device. An H-bridge scheme of series connected power units is adopted. Components of the device comprise a switch cabinet, a transformer cabinet, a power cabinet and a control cabinet. Problems in the prior art that the conventional scheme is high in device investment, low in operation efficiency, large in operation maintenance amount and not high in control accuracy, and cannot provide 60Hz operation working state are solved.
Description
Technical field
The invention belongs to plant equipment field, relate in particular to a kind of large-scale surge generator group static frequency converter.
Background technology
Surge generator is again short-circuit generator, is to do for high-voltage switch gear and transformer etc. the equipment that type approval test provides large short circuit current; Its operation is to be dragged to rated speed by 10 kV high-voltage asynchronous motors, then utilizes rotational energy to do short circuit test; And the soft start of high-voltage asynchronous motor is the difficult point of this project, operating condition was by motor rotor loop serial connection multichannel resistance in the past, in start-up course, progressively short circuit each road resistance is realized soft start, this scheme equipment investment is many, operational efficiency is low, operation maintenance amount is large, and control precision is not high, and 60 Hz operating conditions can not be provided.
Summary of the invention
In order to solve the deficiencies in the prior art, the invention provides a kind of large-scale surge generator group static frequency converter, solved that prior art equipment investment is many, operational efficiency is low, operation maintenance amount is large, control precision is not high, and can not provide the problem of 60 Hz operating conditions.
In order to achieve the above object, the present invention by the following technical solutions: a kind of large-scale surge generator group static frequency converter, employing be the H bridge scheme of power unit cascade, the part of device comprises switch cubicle, transformer case, power cabinet and control cubicle.
A surge generator group static frequency converter, in cascaded H bridge-type high-pressure frequency-conversion starting drive, its input supply voltage is 10 kV, every have 9 power cells mutually; 10 kV line voltages are directly to phase shifting transformer power supply, and phase shifting transformer secondary side has 27 independently three-phase low-voltage windings; Each three-phase low-voltage winding is given a single-phase inverter supply of low pressure; Each that outputs to motor is by 9 power unit cascades, and three-phase is totally 27 power cells, i.e. the voltage of exportable three-phase symmetrical, frequency adjustable transformation, variable frequency power supplys all; Output voltage is 10 kV, and frequency 60 Hz can directly drive the threephase asynchronous of 10 kV.
A surge generator group static frequency converter, switch cubicle mainly by high-pressure vacuum breaker, isolating switch, voltage transformer, shift to transformer and frequency converter forms; An effect of vacuum circuit-breaker and isolating switch be when high voltage frequency converter overhauls, provide insulation blocking, another effect be under malfunction emergency cut-off high voltage source with protection converter plant and high pressure
Motor; Voltage transformer can detect the high voltage of input, and whether the quality of judgement input, output voltage breaks down, and for carrying out high performance control, provides foundation.
A surge generator group static frequency converter, is mainly high pressure isolation phase shifting transformer in transformer case; 10 kV high-pressure frequency-conversion starting drives adopt the IGBT power component of 1 700 V levels, often in power cabinet 9 power cells, consist of; These unit are all powered by isolation phase shifting transformer secondary side, and secondary side differs a phase difference successively, can realize multiplex series connection rectification; In the primary side of phase shifting transformer, after the stack of the secondary side current of each conversion, its current waveform approaches sine wave very much, therefore very little to the humorous wave interference of electrical network, has improved the power factor of system; In transformer case, comprise the point for measuring temperature of temperature monitoring controller simultaneously, its real-time circulation is monitored the temperature of each phase winding, when temperature is during higher than predetermined set value, 6 cooling fans of meeting starting transformer cabinet bottom, simultaneously, transformer temperature monitor controller can feed back to immediately control cubicle information in time when transformer fault, has guaranteed the reliability service of transformer.
A surge generator group static frequency converter, power cabinet is the part of converter plant power main circuit core, it is comprised of a plurality of identical power cells, forms the three-phase voltage that outputs to motor after the output voltage overlapped in series of each power cell; Main power device in power cell is IGBT, and voltage withstand class is 1 700 V levels; When the high voltage frequency converter of 10 kV adopts the I G B T of 1 700 V, often comprise 9 power cells in mutually, and the output voltage of each power cell is for exchanging 641.5 V, frequency converter phase voltage is 9 * 641.5 V, i.e. 5 774 V, its line voltage is 10 kV accordingly; The PWM control technology of optimizing by employing, makes the voltage waveform that outputs to motor approach very much sine wave, and harmonic content is little, and dv/dt is little, need not additionally increase filter, can directly output to normal asynchronous.
A kind of large-scale surge generator group static frequency converter, control cubicle is the core of whole high-pressure frequency-conversion starting drive, operation and setting according to user at Local or Remote, voltage, current analog amount and each switching value in acquisition system, carry out after logical process and calculating, determine and control each power cell, further drive motors, meet output requirement, control cubicle comprises uninterrupted power supply UPS, circuit breaker, programmable logic controller (PLC) PLC, DSP control board, IO plate, fibre optic plate, liquid crystal operation man-machine interface and control button, switch.
The beneficial effect of a kind of large-scale surge generator group static frequency converter of the present invention is: greatly simplified start-up course, equipment investment and operation maintenance workload have been reduced, the i.e. variable frequency power supply of 0～60 H z of high accuracy can also be provided, greatly improved operational efficiency, for the later Starting mode of other surge generator provides reference.
Accompanying drawing explanation
Fig. 1 is a kind of large-scale surge generator group static frequency converter cascaded H bridge-type high-pressure frequency-conversion starting drive power circuit figure schematic diagram.
Fig. 2 is the single power cell internal circuit of a kind of large-scale surge generator group static frequency converter H bridge schematic diagram.
Fig. 3 is that a kind of switch cubicle of large-scale surge generator group static frequency converter manual mode forms schematic diagram.
Fig. 4 is a kind of large-scale surge generator group static frequency converter control cubicle control principle schematic diagram.
Fig. 5 is a kind of large-scale surge generator group static frequency converter surge generator variable frequency starting schematic flow sheet.
Embodiment
A surge generator group static frequency converter, employing be the H bridge scheme of power unit cascade, the part of device comprises switch cubicle, transformer case, power cabinet and control cubicle.
A surge generator group static frequency converter, Fig. 1 is cascaded H bridge-type high-pressure frequency-conversion starting drive power circuit figure, and its input supply voltage is 10 kV, and every have 9 power cells mutually; In Fig. 1,10 kV line voltages are directly to phase shifting transformer power supply, and phase shifting transformer secondary side has 27 independently three-phase low-voltage windings; Each three-phase low-voltage winding is given a single-phase inverter supply of low pressure, and its circuit diagram is as shown in Fig. 2; In the schematic diagram providing at Fig. 1, each that outputs to motor is by 9 power unit cascades, and three-phase is totally 27 power cells, i.e. the voltage of exportable three-phase symmetrical, frequency adjustable transformation, variable frequency power supplys all; Maximum output voltage is 10 kV, and frequency 60 Hz can directly drive the threephase asynchronous of 10 kV.
A surge generator group static frequency converter, switch cubicle mainly by high-pressure vacuum breaker, isolating switch, voltage transformer, shift to transformer and frequency converter forms; The switch cubicle of manual mode forms as shown in Fig. 3, an effect of vacuum circuit-breaker and isolating switch be when high voltage frequency converter overhauls, provide insulation blocking, another effect be under malfunction emergency cut-off high voltage source with protection converter plant and high-tension motor; Voltage transformer can detect the high voltage of input, and whether the quality of judgement input, output voltage breaks down, and for carrying out high performance control, provides foundation.
A surge generator group static frequency converter, is mainly high pressure isolation phase shifting transformer in transformer case; 10 kV high-pressure frequency-conversion starting drives adopt the IGBT power component of 1 700 V levels, often in power cabinet 9 power cells, consist of; These unit are all powered by isolation phase shifting transformer secondary side, and secondary side differs a phase difference successively, can realize multiplex series connection rectification; In the primary side of phase shifting transformer, after the secondary side current stack of each conversion, its current waveform approaches sine wave very much, therefore very little to the humorous wave interference of electrical network, meets international, the domestic requirement that comprises IEEE 519-1992 and G B/T 14549-93 various standards completely; Also improved the power factor of system simultaneously; In transformer case, comprise the point for measuring temperature of temperature monitoring controller, its real-time circulation is monitored the temperature of each phase winding simultaneously, when temperature is during higher than predetermined set value, and 6 cooling fans that can starting transformer cabinet bottom; Meanwhile, transformer temperature monitor controller can feed back to immediately control cubicle information in time when transformer fault, has guaranteed the reliability service of transformer.
A surge generator group static frequency converter, power cabinet is the part of converter plant power main circuit core, it is comprised of a plurality of identical power cells, forms the three-phase voltage that outputs to motor after the output voltage overlapped in series of each power cell; Main power device in power cell is IGBT, and voltage withstand class is 1 700 V levels; When the high voltage frequency converter of 10 kV adopts the I G B T of 1 700 V, often comprise 9 power cells in mutually, and the output voltage of each power cell is for exchanging 641.5 V, frequency converter phase voltage is 9 * 641.5 V, i.e. 5774 V, its line voltage is 10 kV accordingly; The PWM control technology of optimizing by employing, makes the voltage waveform that outputs to motor approach very much sine wave, and harmonic content is little, dv/dt is little, need not additionally increase filter, can directly output to normal asynchronous, and the cable length to motor does not require to converter plant; Between power cell and control cubicle, by a high speed reliable optical fiber, communicate, can effectively avoid electromagnetic interference, improve the reliability of system.
A kind of large-scale surge generator group static frequency converter, control cubicle is the core of whole high-pressure frequency-conversion starting drive, it is operation and the setting at Local or Remote according to user, voltage, current analog amount and each switching value in acquisition system, carry out after logical process and calculating, determine and control each power cell, further drive motors, meets output requirement; The control principle block diagram of control cubicle as shown in Figure 4; Control cubicle comprises uninterrupted electric UPS, circuit breaker, programmable logic controller (PLC) PLC, DSP control board, IO plate, fibre optic plate, liquid crystal operation man-machine interface and control button, switch etc.Wherein, all calculating is carried out in DSP control board; Control core is the double digital signal processor of Specialty Design, and be aided with field programmable gate array and CPLD, adopt them not only can carry out high-speed computation, realize complicated control function, but also greatly simplified the design of control circuit, improved the reliability of control system.
A surge generator group static frequency converter, surge generator variable frequency starting process is as shown in Figure 5; First frequency converter is waited for enabling signal, and when host computer has after enabling signal, frequency converter normally runs to setpoint frequency; When surge generator control system detects will start short circuit test time, to frequency converter, send locking pulse signal, this locking signal requires the shortest 2 s; After locking signal disappears, frequency converter normally runs to setpoint frequency; When P L C detects first locking pulse instruction low level, No starting position, namely locking pulse; When locking pulse being detected, disappear, recover start bit, frequency converter restarts operation; In the locking pulse signal valid period, start button instruction ignore; In this process, when there being shutdown, anxious stop, fault-signal is when occur, all press respective logic and process, at this moment operation shut down or disorderly closedown after, operation start frequency converter again; In whole service process, must guarantee the correctness of locking pulse signal instruction, during short circuit test, must send locking pulse instruction low level signal; Short circuit test completes transmission high level signal.
Claims (6)
1. a large-scale surge generator group static frequency converter, is characterized in that: employing be the H bridge scheme of power unit cascade, the part of device comprises switch cubicle, transformer case, power cabinet and control cubicle.
2. a kind of large-scale surge generator group static frequency converter according to claim 1, is characterized in that: in cascaded H bridge-type high-pressure frequency-conversion starting drive, its input supply voltage is 10 kV, and every have 9 power cells mutually; 10 kV line voltages are directly to phase shifting transformer power supply, and phase shifting transformer secondary side has 27 independently three-phase low-voltage windings; Each three-phase low-voltage winding is given a single-phase inverter supply of low pressure; Each that outputs to motor is by 9 power unit cascades, and three-phase is totally 27 power cells, i.e. the voltage of exportable three-phase symmetrical, frequency adjustable transformation, variable frequency power supplys all; Output voltage is 10 kV, and frequency 60 Hz can directly drive the threephase asynchronous of 10 kV.
3. a kind of large-scale surge generator group static frequency converter according to claim 1, is characterized in that: switch cubicle mainly by high-pressure vacuum breaker, isolating switch, voltage transformer, shift to transformer and frequency converter forms; An effect of vacuum circuit-breaker and isolating switch be when high voltage frequency converter overhauls, provide insulation blocking, another effect be under malfunction emergency cut-off high voltage source with protection converter plant and high-tension motor; Voltage transformer can detect the high voltage of input, and whether the quality of judgement input, output voltage breaks down, and for carrying out high performance control, provides foundation.
4. a kind of large-scale surge generator group static frequency converter according to claim 1, is characterized in that: in transformer case, be mainly high pressure isolation phase shifting transformer; 10 kV high-pressure frequency-conversion starting drives adopt the IGBT power component of 1 700 V levels, often in power cabinet 9 power cells, consist of; These unit are all powered by isolation phase shifting transformer secondary side, and secondary side differs a phase difference successively, can realize multiplex series connection rectification; In the primary side of phase shifting transformer, after the stack of the secondary side current of each conversion, its current waveform approaches sine wave very much, therefore very little to the humorous wave interference of electrical network, has improved the power factor of system; In transformer case, comprise the point for measuring temperature of temperature monitoring controller simultaneously, its real-time circulation is monitored the temperature of each phase winding, when temperature is during higher than predetermined set value, 6 cooling fans of meeting starting transformer cabinet bottom, simultaneously, transformer temperature monitor controller can feed back to immediately control cubicle information in time when transformer fault, has guaranteed the reliability service of transformer.
5. a kind of large-scale surge generator group static frequency converter according to claim 1, it is characterized in that: power cabinet is the part of converter plant power main circuit core, it is comprised of a plurality of identical power cells, forms the three-phase voltage that outputs to motor after the output voltage overlapped in series of each power cell; Main power device in power cell is IGBT, and voltage withstand class is 1 700 V levels; When the high voltage frequency converter of 10 kV adopts the I G B T of 1 700 V, often comprise 9 power cells in mutually, and the output voltage of each power cell is for exchanging 641.5 V, frequency converter phase voltage is 9 * 641.5 V, i.e. 5 774 V, its line voltage is 10 kV accordingly; The PWM control technology of optimizing by employing, makes the voltage waveform that outputs to motor approach very much sine wave, and harmonic content is little, and dv/dt is little, need not additionally increase filter, can directly output to normal asynchronous.
6. a kind of large-scale surge generator group static frequency converter according to claim 1, it is characterized in that: control cubicle is the core of whole high-pressure frequency-conversion starting drive, operation and setting according to user at Local or Remote, voltage in acquisition system, current analog amount and each switching value, carry out after logical process and calculating, determine and control each power cell, further drive motors, meet output requirement, control cubicle comprises uninterrupted power supply UPS, circuit breaker, programmable logic controller (PLC) PLC, DSP control board, IO plate, fibre optic plate, liquid crystal operation man-machine interface and control button, switch.
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| CN201310212204.7A CN103532444A (en) | 2013-05-31 | 2013-05-31 | Large-scale impact power generation device group frequency conversion starting device |
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| CN201310212204.7A CN103532444A (en) | 2013-05-31 | 2013-05-31 | Large-scale impact power generation device group frequency conversion starting device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763069A (en) * | 2016-02-29 | 2016-07-13 | 珠海格力电器股份有限公司 | Voltage regulating system and method |
| CN106205983A (en) * | 2016-09-06 | 2016-12-07 | 红旗集团温州变压器有限公司 | Special transformer |
| CN108344944A (en) * | 2018-01-29 | 2018-07-31 | 湖南电器科学研究院有限公司 | 60Hz tests system |
| CN109980906A (en) * | 2019-04-08 | 2019-07-05 | 合肥尚锐电气有限公司 | A kind of unit cascaded high-voltage frequency converter high reliability two-way fibre system |
| CN112952809A (en) * | 2021-02-20 | 2021-06-11 | 云南电网有限责任公司电力科学研究院 | Series loop-closing power regulating device and method for multi-loop network cabinet of power distribution network |
| CN113985102A (en) * | 2021-09-17 | 2022-01-28 | 阳春新钢铁有限责任公司 | System and method for detecting dynamic voltage of dual power cabinet |
-
2013
- 2013-05-31 CN CN201310212204.7A patent/CN103532444A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763069A (en) * | 2016-02-29 | 2016-07-13 | 珠海格力电器股份有限公司 | Voltage regulating system and method |
| CN105763069B (en) * | 2016-02-29 | 2018-11-06 | 珠海格力电器股份有限公司 | Voltage-regulating system and method |
| CN106205983A (en) * | 2016-09-06 | 2016-12-07 | 红旗集团温州变压器有限公司 | Special transformer |
| CN108344944A (en) * | 2018-01-29 | 2018-07-31 | 湖南电器科学研究院有限公司 | 60Hz tests system |
| CN108344944B (en) * | 2018-01-29 | 2023-09-22 | 湖南电科院检测集团有限公司 | 60Hz test system |
| CN109980906A (en) * | 2019-04-08 | 2019-07-05 | 合肥尚锐电气有限公司 | A kind of unit cascaded high-voltage frequency converter high reliability two-way fibre system |
| CN109980906B (en) * | 2019-04-08 | 2021-06-22 | 合肥尚锐电气有限公司 | High-reliability double-path optical fiber system of unit cascade high-voltage frequency converter |
| CN112952809A (en) * | 2021-02-20 | 2021-06-11 | 云南电网有限责任公司电力科学研究院 | Series loop-closing power regulating device and method for multi-loop network cabinet of power distribution network |
| CN112952809B (en) * | 2021-02-20 | 2022-09-27 | 云南电网有限责任公司电力科学研究院 | Series loop-closing power regulating device and method for multi-loop network cabinet of power distribution network |
| CN113985102A (en) * | 2021-09-17 | 2022-01-28 | 阳春新钢铁有限责任公司 | System and method for detecting dynamic voltage of dual power cabinet |
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Application publication date: 20140122 |