CN202872451U - Cascading redundant power for tundish electromagnetic induction constant thermostatic refining system - Google Patents
Cascading redundant power for tundish electromagnetic induction constant thermostatic refining system Download PDFInfo
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- CN202872451U CN202872451U CN 201220322947 CN201220322947U CN202872451U CN 202872451 U CN202872451 U CN 202872451U CN 201220322947 CN201220322947 CN 201220322947 CN 201220322947 U CN201220322947 U CN 201220322947U CN 202872451 U CN202872451 U CN 202872451U
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Abstract
The utility model relates to an induction heating power supply unit, and particularly refers to a cascading redundant power for a tundish electromagnetic induction thermostatic refining system, wherein through a phase-shifting transformer cabinet, a high voltage power supply is broken down into at least two low-voltage power supplies, one low-voltage power supply is deviated from one another at an angle; a power unit box inverter includes at least two power unit boxes, and each power unit box comprises a rectifier inverter circuit and a bypass protection circuit; a control cabinet is connected with an FPGA chip by a DSP2812 digital processor, is connected and communicated with a power unit by adopting the optical fiber, and is connected and communicated with a host computer and a PLC, so that the input and output of an analog value, the input or output of a switch value, the setting of parameters and equipment control are realized. The cascading redundant power adopts a manner of cascading multiple power unit boxes, a control part adopts a DSP high-speed digital processor with the application of an SPWM modulation algorithm, and a sinusoidal power supply that the output single-phase frequency voltage is adjustable is realized.
Description
Technical field
The utility model relates to the induction heating power device, refers in particular to a kind of tandem type redundant power for tundish electromagnetic induction constant temperature (low overheat) rectification systems.
Background technology
The tandem type redundant power that is used for tundish electromagnetic induction constant temperature (low overheat) rectification systems is to be the intermediate frequency (device of power supply of 200Hz～1kHz) by power semiconductor devices such as thyristor or MOSFET or IGBT with power frequency (50Hz) power conversion, mainly be at induction melting, induction heating, extensive use in the fields such as impewdance matching.The existing medium frequency induction power supply overwhelming majority is Small And Medium Capacity (500KW is following), and having seldom, a part adopts the connection in series-parallel of power device to come the expansion capacity.In this mode of the connection in series-parallel of device, its shortcoming is: the voltage-sharing and the device current-sharing problem in parallel that 1. are not easy to handle well the connection in series-parallel device; 2. owing to the discreteness of device fabrication and parameter, limited the connection in series-parallel number of device; 3. reliability and the number in parallel of device are inversely proportional to, as long as there is in the course of the work a device for power switching to go wrong, whole system is with cisco unity malfunction.The tandem type power supply of common tundish electromagnetic induction constant temperature (low overheat) rectification systems does not arrange redundant system, in case any one cascade Cell breaks down, whole system is with cisco unity malfunction.
Summary of the invention
The purpose of this utility model is for the shortcoming that exists in the background technology and problem improvement and bring new ideas in addition, a kind of main circuit structure that adopts the cascade of redundant power cells case is provided, single power unit box all is a small-sized low pressure small-power power, whole intermediate frequency induction heating power supply output voltage is formed by stacking by the output voltage of power cell, and power output is all power cell power output sums.During normal operation, there are several in running order Cells and several to be in the redundancy unit case of hot stand-by duty on the cascaded loop, after in case in running order power unit box breaks down, system is bypass trouble unit case and the redundancy unit case state of devoting oneself to work immediately, can guarantee like this stable of whole system output, greatly improve the reliability of system.
The technical solution of the utility model is a kind of tandem type redundant power that comprises tundish electromagnetic induction constant temperature (low overheat) rectification systems of following structure of structure, and its characteristics comprise:
Phase shifting transformer cabinet, power unit box inverter cabinet and control cubicle, wherein:
Described phase shifting transformer cabinet is secondary to have a plurality of low pressure windings, angle of each low pressure winding mutual dislocation, each phase shift winding to be respectively corresponding power cell power supply;
Comprise at least two power unit boxes in the described power unit box inverter cabinet, each power unit box comprises rectification inverter circuit and bypass protection circuit, and each Cell is Redundant backup each other;
Described control cubicle connects fpga chip by the DSP2812 digital processing unit, adopts optical fiber to be connected communication with power cell, and is connected communication with host computer with the PLC Programmable Logic Controller, realizes inputing or outputing of analog quantity.
Advantage of the present utility model and beneficial effect:
The utility model adopts the mode of the hot standby cascade of a plurality of redundant power cells case, and control section adopts the DSP high speed numerical processor to use the SPWM modulation algorithm, has realized the adjustable sine power supply of output single-phase voltage to frequency.When system normally moves, the cascade Cell is in the state of redundancy running, there are several in running order Cells and several to be in the redundancy unit case of hot stand-by duty on the cascaded loop, after in case in running order power unit box breaks down, system is bypass trouble unit case and the redundancy unit case state of devoting oneself to work immediately, can guarantee like this stability of whole system output, greatly improve the reliability of system.
Description of drawings
Fig. 1 is the utility model electricity theory diagram.
Fig. 2 is the power unit box electrical schematic diagram.
Embodiment
By Fig. 1,2 as can be known, the tandem type redundant power for tundish electromagnetic induction constant temperature (low overheat) rectification systems described in the utility model, its characteristics comprise:
Phase shifting transformer cabinet A, power unit box inverter cabinet B and control cubicle C, wherein:
A level of described phase shifting transformer cabinet has a plurality of low pressure windings, angle of each low pressure winding mutual dislocation, each phase shift winding to be respectively corresponding power cell power supply;
Comprise at least two power unit boxes among the described power unit box inverter cabinet B, each power unit box comprises rectification circuit, inverter circuit, energy storage filter capacitor, bypass protection circuit, and each Cell is Redundant backup each other; During normal operation, there are several in running order Cells and several to be in the redundancy unit case of hot stand-by duty on the cascaded loop, in case after in running order power unit box broke down, system is bypass trouble unit case and the redundancy unit case state of devoting oneself to work immediately;
Described control cubicle C connects fpga chip by the DSP2812 digital processing unit, adopt optical fiber to be connected communication with power cell, and be connected communication with host computer with the PLC Programmable Logic Controller, realize the control of given, the equipment of the inputing or outputing of the input of analog quantity and output, switching value, parameter.
Rectification inverter circuit in the power unit box described in the utility model comprises the rectification three phase full bridge that is comprised of diode D1, D2, D3, D4, D5, D6, the energy storage filter capacitor group that is comprised of capacitor C 1, C2.Power unit box rectification inverter circuit described in the utility model comprises the inverter that is comprised of insulated gate bipolar transistor IGBT 1, IGBT2, IGBT3, IGBT4.Power unit box bypass protection circuit described in the utility model comprises the RC circuit that capacitor C 4 and resistance R 3 consists of, the control utmost point TRGN by thyristor D11 and TRGP control thyristor D11 carries out the power unit box bypass protection and working heat is standby switches.
Operation principle of the present utility model:
Tandem type redundant power for tundish electromagnetic induction constant temperature (low overheat) rectification systems described in the utility model mainly by a switch cubicle, can be realized connection and the cut-out of inlet wire outlet voltage; A phase shifting transformer cabinet, be used for a high voltage source is decomposed into the low-tension supply of several mutual dislocation certain angles, because the certain differential seat angle of winding mutual dislocation makes the grid side harmonic pollution little, power factor is high, need not power factor compensation and harmonic suppression apparatus; The power unit box inverter cabinet, wherein comprise a plurality of power unit boxes, each power unit box is basic AC-DC-AC single-phase inversion circuit, the rectification side is the diode three phase full bridge, carry out sine pulse width modulation (PWM) control by the IGBT inverter bridge, can obtain single phase alternating current (A.C.) output, by the mode of cascade the PWM waveform of each power unit box be recombinated, can obtain ladder sine pulse width modulation (PWM) waveform; Control cubicle mainly is made of jointly DSP high speed numerical processor, FPGA, single-chip microcomputer, PLC controller, man machine operation interface etc.Master controller adopts DSP2812, and mainly finishing function has: 1. finish the real-time calculating of dislocation phase shift SPWM pulse, calculated data is passed to FPGA in real time; 2. communicate by letter with power cell, the work of power ratio control unit, the power ratio control unit switches between work and hot standby state, and the running status of real-time Transmission power cell, adopt optical fiber communication technology, low-pressure section and high-pressure section are by the fully reliable isolation of optical fiber, and system has high reliability; 3. communicate by letter with host computer, realize the monitoring to whole system; 4. communicate by letter with Siemens S7-300 series of PLC, the realization system opens into the transmission of leaving signal, the button such as inspection and control system " startup ", " stopping " and finish corresponding function; 5. realize the input and output of analog quantity (voltage, electric current, temperature etc.).Fig. 1 has provided based on DSP tandem type intermediate frequency induction heating power supply schematic diagram take 6 power unit box series connection as example.
The power cell box structure as shown in Figure 2, mainly by a rectification three phase full bridge, being used for AC rectification is direct current; An energy storage filter capacitor group is used for energy exchange and filtering; An inverter is for generation of frequency and the controlled AC power of electric current; The standby commutation circuit of bypass protection and working heat; C4 and R3 consist of the RC circuit; be used for reducing the dv/dt at controllable silicon two ends; R4 is used for keeping the controllable silicon both end voltage consistent with dc bus with R5; during the power cell normal operation; D11 is in off state, and when the needs bypass changeover arrived hot standby state, control utmost point TRGN, TRGP input high level by thyristor D11 made thyristor D11 conducting.
Embodiment described in the utility model only is the description that preferred implementation of the present utility model is carried out; be not that the utility model design and scope are limited; under the prerequisite that does not break away from the utility model design philosophy; engineers and technicians make the technical solution of the utility model in this area various modification and improvement; all should fall into protection range of the present utility model; the technology contents that the utility model is asked for protection all is documented in claims.
Claims (4)
1. tandem type redundant power that is used for tundish electromagnetic induction constant temperature rectification systems is characterized in that comprising:
Phase shifting transformer cabinet (A), power unit box inverter cabinet (B) and control cubicle (C), wherein:
Described phase shifting transformer cabinet (A) is secondary to have at least two low pressure windings, angle of each low pressure winding mutual dislocation, each phase shift winding to be respectively corresponding power cell power supply;
Comprise at least two power unit boxes in the described power unit box inverter cabinet (B), each power unit box comprises rectification inverter circuit and bypass protection circuit, and each Cell is Redundant backup each other; During normal operation, there are several in running order Cells and several to be in the redundancy unit case of hot stand-by duty on the cascaded loop, in case after in running order power unit box broke down, system is bypass trouble unit case and the redundancy unit case state of devoting oneself to work immediately;
Described control cubicle (C) connects fpga chip by the DSP2812 digital processing unit, adopt optical fiber to be connected communication with power cell, the switching of the hot standby state of power ratio control cell operation, and be connected communication with host computer with the PLC Programmable Logic Controller, realize the control of given, the equipment of the inputing or outputing of the inputing or outputing of analog quantity, switching value, parameter.
2. the tandem type redundant power for tundish electromagnetic induction constant temperature rectification systems according to claim 1, it is characterized in that the rectification inverter circuit in the described power unit box comprises the rectification three phase full bridge that is comprised of diode (D1, D2, D3, D4, D5, D6), the energy storage filter capacitor group that is formed by electric capacity (C1, C2).
3. the tandem type redundant power for tundish electromagnetic induction constant temperature rectification systems according to claim 1 is characterized in that described power unit box rectification inverter circuit comprises the inverter that is comprised of insulated gate bipolar transistor (IGBT1, IGBT2, IGBT3, IGBT4).
4. the tandem type redundant power for tundish electromagnetic induction constant temperature rectification systems according to claim 1; it is characterized in that the standby commutation circuit of described power unit box bypass protection and working heat comprises the RC circuit that electric capacity (C4) and resistance (R3) consist of; the resistor network that resistance (R4) and resistance (R5) form is controlled thyristor (D11) by the control utmost point (TRGN and TRGP) of thyristor (D11) and is carried out power unit box bypass protection and the standby switching of working heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220322947 CN202872451U (en) | 2012-07-05 | 2012-07-05 | Cascading redundant power for tundish electromagnetic induction constant thermostatic refining system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220322947 CN202872451U (en) | 2012-07-05 | 2012-07-05 | Cascading redundant power for tundish electromagnetic induction constant thermostatic refining system |
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| CN202872451U true CN202872451U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220322947 Expired - Lifetime CN202872451U (en) | 2012-07-05 | 2012-07-05 | Cascading redundant power for tundish electromagnetic induction constant thermostatic refining system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986356A (en) * | 2014-05-13 | 2014-08-13 | 湖南大学 | Control system and method of cascaded multi-level inverter |
| CN108390571A (en) * | 2018-03-07 | 2018-08-10 | 湖南大学 | A kind of tundish electromagnetic heating power supply constant-temperature control method |
-
2012
- 2012-07-05 CN CN 201220322947 patent/CN202872451U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986356A (en) * | 2014-05-13 | 2014-08-13 | 湖南大学 | Control system and method of cascaded multi-level inverter |
| CN103986356B (en) * | 2014-05-13 | 2016-08-24 | 湖南大学 | The control system of a kind of cascade multilevel inverter and method |
| CN108390571A (en) * | 2018-03-07 | 2018-08-10 | 湖南大学 | A kind of tundish electromagnetic heating power supply constant-temperature control method |
| CN108390571B (en) * | 2018-03-07 | 2020-03-24 | 湖南大学 | Tundish electromagnetic heating power supply constant temperature control method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |