CN105471241A - Mechanical contactor based two-path-power-supply high-voltage frequency converter unit bypass apparatus - Google Patents
Mechanical contactor based two-path-power-supply high-voltage frequency converter unit bypass apparatus Download PDFInfo
- Publication number
- CN105471241A CN105471241A CN201510975788.2A CN201510975788A CN105471241A CN 105471241 A CN105471241 A CN 105471241A CN 201510975788 A CN201510975788 A CN 201510975788A CN 105471241 A CN105471241 A CN 105471241A
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- Prior art keywords
- power
- contactor
- bypass
- circuit
- fault
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/46—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by dynamic converters
Abstract
The present invention provides a mechanical contactor based two-path-power-supply high-voltage frequency converter unit bypass apparatus. The apparatus comprises a two-path power supply apparatus, a bypass drive board and a one-path conversion-type direct current contactor. The one-path conversion-type direct current contactor is an execution part of a bypass fault power unit, and the contactor comprises a normally open contact and a normally closed contact; when a power unit has a fault, the fault power unit can be effectively and rapidly cut off from a physical connection; and a freewheeling diode connected in a coil in parallel is used for freewheeling of an inductive current in the coil. The apparatus works in a two-path-power-supply manner, thereby greatly improving reliability of a bypass system of a power unit. By using a conversion-type mechanical contactor, the fault unit can be isolated fundamentally, so that the reliability of a whole high-voltage frequency converter is improved. A majority of fault bypasses of the power unit can be targeted, and a neutral point drift function can be fulfilled.
Description
Technical field
The present invention relates to a kind of is that core devices adopts the high reliability unit bypass device for high voltage converter supplied power with double circuit with contactor.
Background technology
China's production of energy and energy-consuming Yi Lie world first, but the needs that still can not meet industrial production and people's lives development, so in energy today at full stretch, how energy savings becomes extremely important.And the direct constant speed of China's industrial high-power alternating current machine major part employing at present drags, energy waste is huge.As adopted variable-frequency control technique to run, energy-saving effect very obvious.Therefore, the research and development of high-voltage large-capacity ac motor speed control by variable frequency energy conserving system and application, reduce per unit area yield energy consumption to China's industry and be significant.
The drive apparatus of the high and medium power of 200KW accounts for more than 70% of market, domestic electric pressure is 6KV and 10KV, owing to being subject to the withstand voltage level of power device and the restriction of current capacity, high voltage converter many employings multilevel of this electric pressure and correlation technique, wherein single-phase H bridge cascaded multilevel inverter is relatively simple owing to controlling, neutral point voltage balance problem need not be considered, be easy to realize many level, improve harmonic wave of output voltage, facilitate the advantages such as modularized design, industrially obtain good effect.
The power unit cascade that H bridge cascaded multilevel inverter adopts many group low-voltage small-power IGBT to form forms High voltage output, due to employing is power unit cascade, therefore dynamic and static state voltage-sharing between elements is not deposited, and power cell is modular structure, be convenient to change and safeguard.Each power cell is powered by the isolating transformer of a Multiple coil, and realizes controlling and communication with high speed microprocessor and optical fiber.
Due to the mode adopting multiple power unit cascade to form High voltage output, the failure rate of power cell is the highest.The reliable and stable operation of effective protection power cell is very important, and unit bypass technology is arisen at the historic moment thus.Existing high voltage converter unit bypass mode mainly contains two kinds: one, adopt the power electronic device such as controllable silicon as by-pass switch; Two, adopt contactor as by-pass switch; Compared to controllable silicon as bypass elements, contactor type unit bypass, because antijamming capability is strong, reliability is high, has and obviously keeps apart the advantages such as breakpoint, receives more accreditations.
Conventional thyristor electronic device formula bypass, when power cell H bridge inversion circuit works, often because the pulse voltage of high-frequency, high rate of change dv/dt causes thyristor to mislead, this is breakneck to load carrying high voltage converter, needs additionally to install the anti-jamming circuits such as RC absorption additional; And use mechanical contactor to there is not this kind of interference problem, effectively can open, turn off.
Adopt the unit bypass scheme of electronic type thyristor, need extra heat radiation and the adapted rectifier diode of considering thyristor, and On current is larger, heat dissipation capacity and device size are more difficult to more greatly realize; And adopt mechanical contactor unit bypass scheme only need consider to use larger contactor, can be separated installation with power cell, version is simple, is easy to realize.
The unit bypass scheme of electronic type thyristor is adopted to be increase by one at power cell outlet side often to make war, normally closed point is switched to during fault, there is certain risk in this topology, such as power cell Converting Unit IGBT part corrupted, and when cannot turn off completely, thyristor action chance causes unit DC bus to lead directly to, and causes worse interlocking to damage; And adopting mechanical contactor, fault power unit can excise by topology especially during change type (namely one often making war, a normally closed point) contactor physically completely, Comparatively speaking, has higher reliability.
Because unit bypass system guarantees the device of high voltage converter reliability, therefore the reliability of unit bypass system is higher than frequency converter integral level.Reliability design about bypath system needs by particular concern.If power supply circuits adopt two-way Redundancy power supply, when a wherein road fault, immediately can another road of cut-in stand-by, do not affect bypath system and use.
Summary of the invention
The object of this invention is to provide a kind of high voltage converter unit bypass device supplied power with double circuit based on mechanical contactor, specific implementation have employed the Redundancy Design mode that supplies power with double circuit, and have employed a road conversion hysteria contactor, ensure that the reliability of unit bypass device, guarantee that power unit by-pass system is reliable and stable.
For achieving the above object, the present invention is achieved through the following technical solutions:
Based on the high voltage converter unit bypass device supplied power with double circuit of mechanical contactor, it is characterized in that, comprise the power panel that supplies power with double circuit, bypass drive plate, controller, a road conversion hysteria contactor, the described power panel that supplies power with double circuit provides power supply for bypass drive plate, bypass drive plate carries out communication by optical fiber and controller, bypass drive plate, according to controller instruction, drives corresponding contactor control coil, cut-offfing of control contactor; Described contactor is connected on high voltage transducer power unit output, when power cell failure, can be excised from physical connection by fault power unit effectively fast; Contactor comprises one and often opens normally closed two contacts, and the control coil of contactor is parallel with fly-wheel diode.
The described power panel that supplies power with double circuit is made up of the mutual independently power supply circuits of two-way, specifically comprise transformer, rectification circuit, capacitor filter and voltage stabilizing circuit, two-way exports by diode (led) module as diverter switch, realization is supplied power with double circuit redundancy structure, when the main power supply circuits fault used, switch to stand-by circuit instantaneously, ensure shunting device safe and stable operation.
Compared with prior art, the invention has the beneficial effects as follows:
According to technical scheme of the present invention, owing to have employed the Redundancy Design of the circuit that supplies power with double circuit, and have employed a road conversion hysteria contactor, there is higher reliability, improve high voltage converter complete machine operation stability.
Accompanying drawing explanation
Fig. 1 is system construction drawing of the present invention.
Fig. 2 is the power principle figure that supplies power with double circuit.
Fig. 3 is contactor bypass power cell topology.
Fig. 4 is bypass contactor schematic diagram.
Fig. 5 is cascaded multilevel medium voltage inverter principle schematic.
Fig. 6 is cascaded multilevel medium voltage inverter output waveform.
Fig. 7 is calibration power unit topology.
Embodiment
Below in conjunction with accompanying drawing, concrete technical scheme of the present invention is explained in further detail.
See Fig. 1, the present invention is based on the high voltage converter unit bypass device of mechanical contactor, comprise the power panel that supplies power with double circuit, bypass drive plate, controller, a road conversion hysteria contactor, the described power panel that supplies power with double circuit provides power supply for bypass drive plate, bypass drive plate carries out communication by optical fiber and controller, bypass drive plate, according to controller instruction, drives corresponding contactor control coil, cut-offfing of control contactor; And continue to detect all contactor operating states, be provided with failure alarm circuit, effectively can detect bypass drive plate, D.C. contactor and order circuit and whether there is fault.Bypass drive plate carries out communication by optical fiber and controller, and communication speed is up to 10Mb/S.
See Fig. 2, the power panel that supplies power with double circuit is made up of the mutual independently power supply circuits of two-way, specifically comprise transformer (T1, T2), the rectifier circuit that is made up of diode is connected to transformer output, capacitor filter is connected with diode rectifier bridge circuit in parallel, diode voltage stabilizing circuit is provided with at the output of capacitor filter, two-way output is in parallel connection, by diode as diverter switch, realizes supplying power with double circuit redundancy structure.When the main power supply circuits fault used, switch to stand-by circuit instantaneously, ensure shunting device safe and stable operation.
Fig. 3 is contactor bypass power cell topological diagram, the H bridge power unit be made up of bypass contactor comprises fuse (with reference to figure 1), rectification module, DC filter capacitor, IGBT are formed H-bridge circuit, discharge circuit, power cell control circuit;
Described fuse, at power cell three-phase input end, when power cell internal device failure, can effectively fuse, and ensures the safety of Circuit Fault on Secondary Transformer winding.
Described rectification module be two Diode series together, and form the uncontrollable rectification circuit of three-phase by three rectification modules, input AC be rectified into pulsating direct current.
After described DC filter capacitor is connected to rectification circuit, for absorbing the ripple component of direct voltage after rectification, it is made to become level and smooth.
The H-bridge circuit that described IGBT is formed, is the H-bridge inverter circuit be made up of the IGBT of four or its multiple, opens shutoff order, achieve and direct voltage is become controllable AC voltage according to diagonal angle IGBT.
Described discharge loop, for the voltage stored in bleed off DC filter capacitor, this loop is generally realized at power cell DC bus by a high power discharge resistant series, DC bus-bar voltage is had to the load of particular/special requirement, this circuit also can be connected a controlled IGBT on discharge resistance, when DC bus-bar voltage exceedes to a certain degree, this IGBT conducting can be set, timely bleed off voltage.
Described power cell control circuit specifically comprises power supply, control circuit, drive circuit;
Power supply takes from high-voltage dc voltage or the three-phase input ac voltage of DC bus, and by inner transformation, stable output certain voltage is power control circuit and drive circuitry;
Power cell control circuit comprises the circuit such as communicating circuit, fault detect, DC bus-bar voltage detection, display circuit, is the control core of power cell, and carries out real-time communication with upper level controller;
Power unit driving circuit for driving IGBT, and detects the operating state of IGBT, effectively can realize defencive function under IGBT abnormality.
One road change type contactor is connected on high voltage transducer power unit output, when power cell failure, can be excised from physical connection by fault power unit effectively fast.
As shown in Figure 4, contactor comprises one and often opens normally closed two contacts, and the control coil of contactor is parallel with fly-wheel diode.Bypass drive plate comprises contactor bypass drive circuit, bypass testing circuit, bypass control circuit, can the switching on and shutting down of each contactor of centralized management turn off, particular power cell bypass during to realize fault; And can effectively detect contactor state and corresponding information; By optical-fibre communications and the communication of high voltage converter master controller, the bypass for certain power cell can be realized.
Bypass control circuit, for calculating, controlling bypass dependent instruction, and carries out real-time communication with upper level controller, effective monitoring system running status;
Whether bypass allows testing circuit, powers and contactor state for detecting bypath system, allow to perform bypass instruction to represent.
Whether bypass success testing circuit, have electric current to pass through, to represent whether bypass instruction runs succeeded by detecting contactor drive coil.
Bypass drive circuit, can the device such as the switching tube such as selective relay or metal-oxide-semiconductor as driver part, for driving the coil of corresponding contactor, reaching control contactor and cut-offfing object.
The bypass power supply power acquisition Redundancy Design that supplies power with double circuit of the present invention, by the mutual independently current supply circuit of two-way, specifically comprise transformer, rectification circuit, capacitor filter and voltage stabilizing circuit, by using diode as diverter switch, when the main power supply circuits fault used, namely can switch to stand-by circuit instantaneously, ensure shunting device safe and stable operation.This kind of conceptual design has taken into full account the weak link of system, further increases the reliability service of shunting device entirety, ensure that high voltage converter complete machine has higher reliability.
Bypass drive plate is the centralized-control center of contactor, and carries out real-time communication with high voltage converter controller by optical fiber.When power cell failure, after bypass drive plate receives the corresponding information from controller, immediately deciliter control is carried out to the contactor of trouble unit, fault power unit is connected excision, after constituting new connection from original.Send bypass pass signal to controller, controller is restart start cell again, and carries out searching the work such as frequency, and restorer runs well.Each bypass time controls within 300ms, so the equipment that can not affect normally works.According to produced on-site task, shut down in good time and repair trouble unit.
As shown in Figure 5, be cascaded multilevel medium voltage inverter structure and working principle figure.Its operation principle is that input transformer adopts phase shifting transformer, and namely transformer primary side adopts extend-triangle connection, and secondary is that Multiple coil exports, and each group exports the certain electrical degree of mutual deviation, suppresses input harmonic current object to reach.Export and adopt many level conversion formula PWM, same mutually in the certain phase place of the triangular carrier mutual deviation of different series unit, to increase output voltage step, improve equivalent switch efficiency, improve output waveform.
Fig. 6 is each power cell output waveform, because the type of attachment of series connection, finally outputs the complete waveform of multiplex, directly may be used for motor and drives.Due to input, the good output waveform of cascaded multilevel medium voltage inverter, harmonic content is little, and facilitates adaptation of motor, obtains large-scale popularization now.
Fig. 7 is a kind of canonical form power cell of cascaded multilevel medium voltage inverter, comprises the rectification circuit be made up of diode, and effect is that the three-phase alternating current inputted from phase shifting transformer secondary side is rectified into pulsating direct current circuit; The filter circuit that alminium electrolytic condenser or thin-film capacitor are formed, effect is that Rectified alternating current is become level and smooth direct current; The H-bridge inverter circuit be made up of IGBT, effect is that direct current is become adjustable alternating current, finally by multiple units in series be superimposed as can drive motors interchange export.Typically, power cell due to device and control circuit more and complicated, be difficult to ensure higher reliability; In order to ensure that high voltage converter entirety possesses higher reliability, the impact of numerous power cell on complete machine just must be reduced; Unit bypass technology is arisen at the historic moment exactly under this kind of demand, effectively can excise trouble unit, reconfigure new connection, ensures that high voltage converter can work on.
In sum, the unit bypass scheme with a road change type electromechanical contactors that the present invention adopts, in contrast, have circuit structure simple, use less device, fault point is few, can the conducting more feature such as big current; And the unit topology that this contactor is formed, when fault, can physical removal be accomplished completely, more eurypalynous cell failure can be solved.Possess high dielectric voltage withstand performance between this contactor coil and contact, all bypass contactors of a high voltage converter can centralized control, and convenient management, intelligence degree is high.Contactor controls to be more prone to, and is not easily interfered, stable.
Claims (2)
1. based on the high voltage converter unit bypass device supplied power with double circuit of mechanical contactor, it is characterized in that, comprise the power panel that supplies power with double circuit, bypass drive plate, controller, a road conversion hysteria contactor, the described power panel that supplies power with double circuit provides power supply for bypass drive plate, bypass drive plate carries out communication by optical fiber and controller, bypass drive plate, according to controller instruction, drives corresponding contactor control coil, cut-offfing of control contactor; Described contactor is connected on high voltage transducer power unit output, when power cell failure, can be excised from physical connection by fault power unit effectively fast; Contactor comprises one and often opens normally closed two contacts, and the control coil of contactor is parallel with fly-wheel diode.
2. the high voltage converter unit bypass device supplied power with double circuit based on mechanical contactor according to claim 1, it is characterized in that, the described power panel that supplies power with double circuit is made up of the mutual independently power supply circuits of two-way, specifically comprise transformer, the rectifier circuit that is made up of diode is connected to transformer output, capacitor filter is connected with diode rectifier bridge circuit in parallel, diode voltage stabilizing circuit is provided with at the output of capacitor filter, two-way output is in parallel connection, by diode as diverter switch, realize supplying power with double circuit redundancy structure; When the main power supply circuits fault used, switch to stand-by circuit instantaneously, ensure shunting device safe and stable operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510975788.2A CN105471241A (en) | 2015-12-23 | 2015-12-23 | Mechanical contactor based two-path-power-supply high-voltage frequency converter unit bypass apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510975788.2A CN105471241A (en) | 2015-12-23 | 2015-12-23 | Mechanical contactor based two-path-power-supply high-voltage frequency converter unit bypass apparatus |
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| Publication Number | Publication Date |
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| CN105471241A true CN105471241A (en) | 2016-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510975788.2A Pending CN105471241A (en) | 2015-12-23 | 2015-12-23 | Mechanical contactor based two-path-power-supply high-voltage frequency converter unit bypass apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196514A (en) * | 2017-06-29 | 2017-09-22 | 上海电气富士电机电气技术有限公司 | A kind of power-supply system of power cell |
| CN107516937A (en) * | 2017-09-11 | 2017-12-26 | 鞍钢集团工程技术有限公司 | A kind of motor control loop power supply mode |
| CN109103051A (en) * | 2018-09-07 | 2018-12-28 | 青岛凯腾电子有限公司 | A kind of AC contactor controller and control method |
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| CN1983784A (en) * | 2005-12-12 | 2007-06-20 | 上海艾帕电力电子有限公司 | Power unit and high-voltage frequency converter with contactor bypass function |
| CN202978689U (en) * | 2012-12-07 | 2013-06-05 | 上海亿思特电气股份有限公司 | Bypass apparatus for power unit of high-voltage frequency converter |
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| US20140063870A1 (en) * | 2012-08-30 | 2014-03-06 | Siemens Industry, Inc. | Apparatus and methods for restoring power cell functionality in multi-cell power supplies |
| CN203596728U (en) * | 2013-10-23 | 2014-05-14 | 桂林君泰福电气有限公司 | High voltage frequency converter power unit machinery bypass device |
| CN205356133U (en) * | 2015-12-23 | 2016-06-29 | 辽宁荣信电气传动技术有限责任公司 | Dual -path electricity supply 's high -voltage inverter unit bypass device based on mechanical type contactor |
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2015
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Patent Citations (6)
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| CN1983784A (en) * | 2005-12-12 | 2007-06-20 | 上海艾帕电力电子有限公司 | Power unit and high-voltage frequency converter with contactor bypass function |
| US20140063870A1 (en) * | 2012-08-30 | 2014-03-06 | Siemens Industry, Inc. | Apparatus and methods for restoring power cell functionality in multi-cell power supplies |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107196514A (en) * | 2017-06-29 | 2017-09-22 | 上海电气富士电机电气技术有限公司 | A kind of power-supply system of power cell |
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| CN107516937A (en) * | 2017-09-11 | 2017-12-26 | 鞍钢集团工程技术有限公司 | A kind of motor control loop power supply mode |
| CN109103051A (en) * | 2018-09-07 | 2018-12-28 | 青岛凯腾电子有限公司 | A kind of AC contactor controller and control method |
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Address after: 114051 Anshan high tech Zone, Liaoning province science and technology road, No. 108 Applicant after: Wolong electric group Liaoning Rongxin electric drive Co., Ltd. Address before: 114051 Anshan high tech Zone, Liaoning province science and technology road, No. 108 Applicant before: Liaoning Rongxin Electric Drive Technology Co., Ltd. |
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