CN112865558A - High-power adjustable DC power supply device - Google Patents
High-power adjustable DC power supply device Download PDFInfo
- Publication number
- CN112865558A CN112865558A CN202110174360.3A CN202110174360A CN112865558A CN 112865558 A CN112865558 A CN 112865558A CN 202110174360 A CN202110174360 A CN 202110174360A CN 112865558 A CN112865558 A CN 112865558A
- Authority
- CN
- China
- Prior art keywords
- output
- voltage
- current
- rectifier
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
- H02M7/1623—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit
- H02M7/1626—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit with automatic control of the output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/125—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M3/135—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M3/137—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/17—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only arranged for operation in parallel
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/19—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only arranged for operation in series, e.g. for voltage multiplication
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses an adjustable direct current power supply device.A primary winding of a rectifier transformer adopts 5-stage taps, and the output voltage of a secondary side, namely the input voltage of a rectifier, reaches 10-stage no-load voltage regulation by connecting the primary winding into a delta connection method or a star connection method. The secondary side is provided with two windings which are respectively in triangular and star connection (the phase difference is 30 degrees), and the two windings are output to the rectifier in two paths. The rectifier consists of two groups of 6-pulse rectifier bridges, has two working modes of series connection and parallel connection by changing the connection mode of the output ends of the rectifier bridges, and can realize power output of DC0-1000V by combining 10-level voltage regulation of the rectifier transformer. The invention has various voltage regulation modes, can output rated voltage of DC0-1000V in a wide range, and provides stable and reliable power supply for various direct current motors and direct current power electronic equipment; the input and output voltage regulation precision is high, the power factor of the power supply input side of the power supply device can be greatly improved, and the ripple factor of the output voltage is reduced.
Description
Technical Field
The invention belongs to the technical field of power supplies, particularly relates to the technical field of high-power frequency rectification power supplies, and particularly relates to a high-power adjustable direct-current power supply.
Background
With the rapid development of power electronic technology, power electronic devices have been integrated into the work and life of people, and all electronic devices need to have reliable power supply systems. In the field of medium-voltage high power, the power frequency rectification power supply has the advantages of strong adaptability to power supply environment, strong impact load resistance, high reliability and the like, and is widely applied in various fields.
At present, a medium-voltage high-power-frequency rectification power supply which is actually applied basically adopts the following three modes: the method comprises the following steps that firstly, diode rectification is adopted, the output voltage is uncontrollable, the input current harmonic wave is large, and the power factor is low; secondly, IGBT pulse width modulation is adopted, and although controllability of output voltage and improvement of power factor are achieved, equipment cost is high, reliability is low, and a control loop is complex; and thirdly, controllable output voltage is realized by adopting silicon controlled rectifier phase shift control, but the power factor of the phase shift pulse becomes worse and worse along with backward shift of the phase shift pulse.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides an adjustable direct-current power supply device, which is characterized in that: the rated output voltage of the power supply device is DC0-1kV and can be continuously adjusted; the power supply device has multiple voltage regulation modes to realize continuous regulation of output voltage; the power supply device can reduce the ripple factor of output voltage and improve the power factor of an input power supply within a full power range; the power supply device has the advantages of simple structure, reliable operation and strong anti-interference capability, and can well meet the requirements of various direct current loads on the direct current power supply.
The main technical scheme of the invention is as follows: an adjustable DC power supply unit is composed of input switch cabinet, rectifier transformer, rectifier and its control system, DC filter, pure water cooler, and output DC cabinet. The adjustable direct current power supply device is characterized in that the input voltage of the adjustable direct current power supply device is AC10.5kV, and the output voltage range is DC0-1 kV; the input switch cabinet can control the input or cut-off of an AC10.5kV power supply and provides a protection function for the rectifier transformer, the rectifier and rear-end electric equipment; the rectifier transformer is connected with an AC10.5kV alternating current power supply from an input switch cabinet, two secondary sides are respectively in triangular and star connection, the two secondary sides are output to the rectifier in two ways, and the AC10.5kV equipment is isolated from the rectifier; the rectifier takes a controllable thyristor as a basic element to form two groups of three-phase six-bridge fully-controlled rectifying units, and can realize adjustable output of direct-current voltage of 0-1 kV; the direct current filter consists of a smoothing reactor, a filter capacitor and a discharge resistor, and ensures that the ripple coefficient of the output voltage is not more than 2% from no load to full load; the pure water cooler adopts a cooling mode of closed deionized water internal circulation and external cooling water heat exchange, ensures that the working temperature of the rectifier does not exceed the requirement, and provides the functions of equipment failure and high-temperature alarm; the output direct current cabinet can control the input or cut-off of direct current voltage and provide a protection function for rear-end electric equipment; the control system consists of a set of thyristor 12 pulse wave trigger controllers and a set of PLC, controls the adjustment and output of direct-current voltage, and has the functions of voltage stabilization, cut-off, protection and alarm.
The input switch cabinet is formed by splicing an incoming line isolation cabinet and a circuit breaker cabinet, equipment such as a high-voltage circuit breaker, a current sensor, a voltage sensor, an overvoltage protector, a zero-sequence current transformer and a comprehensive protection device are installed in the cabinet, and the input switch cabinet is mainly used for switching on/off of an AC10.5kV power supply, monitoring voltage and current signals and other non-electric quantity signals on an AC10.5kV voltage circuit in real time, automatically switching off the AC10.5kV circuit under abnormal conditions, and protecting a power supply device and a front-end power transmission line.
The primary winding of the rectifier transformer adopts 5-stage taps, the secondary output voltage, namely the input voltage of the rectifier, achieves 10-stage no-load voltage regulation by connecting the primary winding in a triangular connection mode or a star connection mode, and the voltage regulation range of the rectifier, namely the backward shift degree of phase shift pulse, can be greatly reduced by selecting the corresponding input voltage of the rectifier according to the required direct current output voltage, so that the ripple voltage of the output voltage is greatly reduced, and the power factor of an input power supply at the AC10.5kV side is improved.
The rectifier is composed of two groups of 6-pulse rectifier bridges, and a rectifying circuit adopts a non-in-phase inverse parallel structure. The output end of the power supply is connected in a different mode, so that the power supply has two working modes of series connection and parallel connection. The adjustable range of the output voltage can be realized to be DC0-1000V by combining 10-stage voltage regulation of the rectifier transformer and series-parallel connection of the rectifiers. The control mode adopts a twelve-pulse-wave phase-controlled rectification mode to realize accurate regulation of output voltage; meanwhile, the phase-shift pulse angle of the controllable thyristor does not exceed 10 degrees, and the ripple factor of the output voltage can be further reduced by combining the direct-current filter.
The output direct current cabinet adopts an NW-DC 40 series circuit breaker of Schneider company as a switch for cutting off rear-end electric equipment and provides a corresponding current and voltage protection function.
The invention has the characteristics that the invention has various voltage regulation modes, can output rated voltage of DC0-1000V in a wide range, and provides stable and reliable power supply for various direct current motors and direct current power electronic equipment; the input and output voltage regulation precision is high, the power factor of the power supply input side of the power supply device can be greatly improved, and the ripple factor of the output voltage is reduced. The device has the advantages of simple structure, reliable operation and strong anti-interference capability, and can well meet the requirements of various direct current loads on the power supply.
The invention relates to an adjustable direct current power supply device which is mainly used for providing an adjustable direct current power supply for high-power electronic equipment in a direct current system joint debugging test. The adjustable direct current power supply has the functional characteristics that the input voltage of the adjustable direct current power supply is AC10.5kV, and the output voltage range is DC 0-1000V; the primary winding of the rectifier transformer adopts 5-level taps, and the output voltage of the secondary winding, namely the input voltage of the rectifier, reaches 10-level no-load voltage regulation by connecting the primary winding into a delta connection method or a star connection method. The secondary side is provided with two windings which are respectively in triangular and star connection (the phase difference is 30 degrees), and the two windings are output to the rectifier in two paths. The rectifier consists of two groups of 6-pulse rectifier bridges, has two working modes of series connection and parallel connection by changing the connection mode of the output ends of the rectifier bridges, and can realize power output of DC0-1000V by combining 10-level voltage regulation of the rectifier transformer. The invention has the advantages that the voltage regulation device has various voltage regulation modes, can output rated voltage of DC0-1000V in a wide range, and provides stable and reliable power supply for various direct current motors and direct current power electronic equipment; the input and output voltage regulation precision is high, the power factor of the power supply input side of the power supply device can be greatly improved, and the ripple factor of the output voltage is reduced. The device has the advantages of simple structure, reliable operation and strong anti-interference capability, and can well meet the requirements of various direct current loads on the power supply.
Drawings
FIG. 1 is a schematic diagram of the electrical system of the high power adjustable DC power supply apparatus of the present invention;
FIG. 2 is a schematic diagram of a control system for the power supply apparatus;
FIG. 3 is a schematic diagram of a primary system of an input switchgear;
FIG. 4 is a schematic diagram of a primary system of rectifier transformer, rectifier and filter;
fig. 5 is a schematic diagram of a primary system of an output dc cabinet.
Detailed Description
As shown in fig. 1, the present invention mainly comprises an input switch cabinet, a rectifier transformer, a rectifier, a dc filter, an output dc cabinet, a control system, and the like. The three-phase input end of the input switch cabinet is connected with an external three-phase AC10.5kV input power supply, and the three-phase output end is used for connecting a three-phase input terminal of the rectifier transformer; the rectifier transformer is provided with 2 groups of three-phase output terminals which are respectively connected with three-phase input terminals of 2 groups of rectifiers; the output of the rectifier is provided with two connecting terminals of plus and minus, which are respectively connected to two input ends of plus and minus of the direct current filter; the plus and minus two output ends of the direct current filter are connected to the input end of the output direct current cabinet, and the output side of the output direct current cabinet is used for connecting an external direct current load.
As shown in fig. 2, a control system of the power supply device mainly includes a signal acquisition module, a core controller, a driving circuit, and a touch screen. The signal acquisition module is mainly used for detecting voltage and current signals of an AC10.5kV side, a direct current output side and a low-voltage side of a rectifier transformer, and receiving switch signals input into the switch cabinet, the rectifier transformer, the rectifier and an output direct current isolation cabinet; the core controller is used for receiving an external control instruction, sending out a control instruction according to a related signal transmitted by the signal acquisition module, respectively controlling the on-load tap changer and the controllable thyristor unit, and realizing the regulation function of the output voltage by regulating the output voltage of the rectifier transformer and the conduction sequence and conduction angle of the controllable thyristor. The driving circuit is used for amplifying and isolating the control pulse of the controllable thyristor by the core controller, and realizing the normal conduction and the shutoff of the controllable thyristor unit according to the control logic of the driving circuit, thereby realizing the regulation function of the output voltage; the touch screen provides a man-machine interface for displaying the operating parameters of the power supply device and simultaneously is used for inputting control instructions, so that the operation of operators is facilitated.
As shown in fig. 3, PT1 is a voltage sensor for detecting a voltage signal on the ac10.5kv incoming line side; the CT1 current sensor is used for detecting a current signal of an AC10.5kV incoming line side; QF1 is a high-voltage circuit breaker, and realizes the cutting/inputting of electrical equipment at the rear end of the power supply device by means of the switching-off/switching-on operation; meanwhile, 1 set of comprehensive protection device is also configured in the input switch cabinet, collects voltage and current signals, receives commands of emergency cutting-off actions and the like input from the outside and controls the opening/closing of the QF 1.
As shown in fig. 4, the primary winding of the rectifier transformer adopts 5-stage taps, and the output voltage of the secondary winding, i.e., the input voltage of the rectifier, is regulated to 10-stage no-load voltage by connecting the primary winding in a delta connection or a star connection. The secondary side is provided with two windings which are respectively in triangular and star connection (the phase difference is 30 degrees), and the two windings are output to the rectifier in two paths. The rectifier consists of two groups of 6-pulse rectifier bridges, has two working modes of series connection and parallel connection by changing the connection mode of the output ends of the rectifier bridges, and can realize power output of DC0-1000V by combining 10-level voltage regulation of the rectifier transformer.
As shown in fig. 5, QF1 is a dc circuit breaker, and is configured to cut off/input a dc load at the rear end of a power supply device by switching on/off operation thereof; meanwhile, the direct current breaker is provided with a three-section current protection device, and when a fault occurs, the QF1 is cut off according to the set protection current value and the set action time. FL and PT are current divider and voltage sensor, which are used to detect current and voltage signals at output end.
The working process of the present invention is briefly described as follows:
first, a control system in the rectifier checks and confirms the device states of an input switch cabinet, a rectifier transformer, a rectifier and an output dc isolation cabinet in the power supply device. In the case that all the equipment is confirmed to be in good condition, a 'start permission' signal is sent to the input switch cabinet.
Secondly, after the input switch cabinet receives the starting permission signal, the switch-on command is unlocked. At the moment, the high-voltage circuit breaker can be switched on by inputting a switching-on button on the switch cabinet or a switching-on instruction on a touch screen in the rectifier, and a switching-on indication signal is sent to the control system.
And thirdly, after receiving a 'closing indication' signal, a control system in the rectifier can calculate the regulating gear of the on-load switch of the transformer, the conduction angle and the conduction sequence of the thyristor (the conduction angle of the thyristor is ensured to be less than 10 degrees) under the no-load condition according to the set output voltage requirement.
And thirdly, finishing the output of the voltage on the output side of the rectifier according to the calculation result. Meanwhile, the control system monitors the voltage value of the direct current output side in real time, compares the voltage value with a voltage set value, performs closed-loop control, and continuously finely adjusts the conduction angle of the thyristor to realize the stability of the output voltage.
Finally, with the increase of the electric load at the rear end of the power supply device, the control system monitors the current value of the direct current output side in real time, and performs step primary regulation on the output voltage of the rectifier transformer through the on-load switch according to the short-circuit impedance of the rectifier transformer; and the output voltage and the current are stabilized by continuously fine-tuning the conduction angle of the thyristor.
The invention relates to an adjustable direct-current power supply device, which comprises an input switch cabinet, a rectifier transformer, a rectifier and a control system thereof, a direct-current filter, a pure water cooler and an output direct-current cabinet; the input voltage of the adjustable direct-current power supply device is AC10.5kV, and the output voltage range is DC 0-1000V; the input switch cabinet can control the input or cut-off of an AC10.5kV power supply and provides a protection function for the rectifier transformer, the rectifier and rear-end electric equipment; the rectifier transformer is connected with an AC10.5kV alternating current power supply from an input switch cabinet, two secondary sides are respectively in triangular and star connection, the two secondary sides are output to the rectifier in two ways, and the AC10.5kV equipment is isolated from the rectifier; the rectifier takes a controllable thyristor as a basic element to form two groups of three-phase six-bridge fully-controlled rectifying units, and can realize adjustable output of 0-1000V direct-current voltage; the direct current filter cabinet consists of a smoothing reactor, a filter capacitor and a discharge resistor, and ensures that the ripple coefficient of the output voltage is not more than 2% from no load to full load; the pure water cooler adopts a cooling mode of closed deionized water internal circulation and external cooling water heat exchange, ensures that the working temperature of the rectifier does not exceed the requirement, and provides the functions of equipment failure and high-temperature alarm; the output direct current cabinet can control the input or cut-off of direct current voltage and provide a protection function for rear-end electric equipment; the control system consists of a set of thyristor 12 pulse wave trigger controllers and a set of PLC, controls the adjustment and output of direct-current voltage, and has the functions of voltage stabilization, cut-off, protection and alarm.
The primary winding of the rectifier transformer adopts 5-level taps, and the output voltage of the secondary winding, namely the input voltage of the rectifier, reaches 10-level no-load voltage regulation by connecting the primary winding into a delta connection method or a star connection method; the rectifier consists of two groups of 6-pulse rectifier bridges, and has two working modes of series connection and parallel connection by changing the connection mode of the output ends of the rectifier; through 10-stage voltage regulation of the rectifier transformer and series-parallel connection of the rectifiers, the adjustable range of the output voltage can be DC 0-1000V.
The rectifier control system adopts a twelve-pulse-wave phase-controlled rectification mode to realize accurate regulation of output voltage; meanwhile, the phase-shift pulse angle of the controllable thyristor does not exceed 10 degrees, and the ripple factor of the output voltage can be further reduced by combining the direct-current filter.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A high-power adjustable direct-current power supply device is characterized by comprising an input switch cabinet, a rectifier transformer, a rectifier, a direct-current filter, an output direct-current cabinet and a control system, wherein the three-phase input end of the input switch cabinet is connected with an external three-phase AC10.5kV input power supply, and the three-phase output end of the input switch cabinet is connected with a three-phase input terminal of the rectifier transformer; the rectifier transformer is provided with 2 groups of three-phase output terminals which are respectively connected with three-phase input terminals of 2 groups of rectifiers; the output of the rectifier is provided with two connecting terminals of plus and minus, which are respectively connected to two input ends of plus and minus of the direct current filter; the plus and minus two output ends of the direct current filter are connected to the input end of the output direct current cabinet, and the output side of the output direct current cabinet is used for connecting an external direct current load.
2. The high-power adjustable direct-current power supply device according to claim 1, wherein a control system of the power supply device mainly comprises a signal acquisition module, a core controller, a driving circuit and a touch screen, wherein the signal acquisition module is mainly used for detecting voltage and current signals at an AC10.5kV side, a direct-current output side and a low-voltage side of a rectifier transformer and receiving switching signals input into a switch cabinet, the rectifier transformer, a rectifier and an output direct-current isolation cabinet; the core controller is used for receiving an external control instruction, sending a control instruction according to a related signal transmitted by the signal acquisition module, respectively controlling the on-load tap changer and the controllable thyristor unit, and realizing the regulation function of the output voltage by regulating the output voltage of the rectifier transformer and the conduction sequence and conduction angle of the controllable thyristor; the driving circuit is used for amplifying and isolating the control pulse of the controllable thyristor by the core controller, and realizing the normal conduction and the shutoff of the controllable thyristor unit according to the control logic of the driving circuit, thereby realizing the regulation function of the output voltage; the touch screen provides a man-machine interface for displaying the operating parameters of the power supply device and simultaneously is used for inputting control instructions, so that the operation of operators is facilitated.
3. The high power adjustable DC power supply device according to claim 1, comprising a voltage sensor PT1, a current sensor CT1 and a high voltage breaker QF1,
the voltage sensor PT1 is used for detecting a voltage signal of an AC10.5kV incoming line side;
the current sensor CT1 is used for detecting a current signal of an AC10.5kV incoming line side;
the high-voltage circuit breaker QF1 realizes the cutting/inputting of the electrical equipment at the rear end of the power supply device by means of the opening/closing operation;
in the input switch cabinet, 1 set of comprehensive protection device is configured, and the protection device collects voltage and current signals, receives an emergency cutting-off action command input from the outside and controls the opening/closing of QF 1.
4. The high-power adjustable direct-current power supply device according to claim 1, wherein a primary winding of the rectifier transformer adopts 5-level taps, and the output voltage of a secondary winding, namely the input voltage of the rectifier, reaches 10-level no-load voltage regulation by connecting the primary winding into a delta connection method or a star connection method; the secondary side is provided with two windings which are respectively in triangular and star connection, the phase difference is 30 degrees, and the two windings are output to the rectifier in two paths; the rectifier consists of two groups of 6-pulse rectifier bridges, has two working modes of series connection and parallel connection by changing the connection mode of the output ends of the rectifier bridges, and can realize power output of DC0-1000V by combining 10-level voltage regulation of the rectifier transformer.
5. The high-power adjustable direct-current power supply device according to claim 1, wherein QF1 is a direct-current circuit breaker, and the cut-off/input of the direct-current load at the rear end of the power supply device is realized by means of the opening/closing operation of the direct-current circuit breaker; meanwhile, the direct current breaker is provided with a three-section current protection device, and when a fault occurs, the QF1 is cut off according to a set protection current value and action time; FL and PT are current divider and voltage sensor, which are used to detect current and voltage signals at output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174360.3A CN112865558A (en) | 2021-02-07 | 2021-02-07 | High-power adjustable DC power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174360.3A CN112865558A (en) | 2021-02-07 | 2021-02-07 | High-power adjustable DC power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112865558A true CN112865558A (en) | 2021-05-28 |
Family
ID=75989305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110174360.3A Pending CN112865558A (en) | 2021-02-07 | 2021-02-07 | High-power adjustable DC power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112865558A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142748A (en) * | 2021-11-19 | 2022-03-04 | 广东福德电子有限公司 | Main circuit topology and control method of high-power direct-current power supply |
| CN115276238A (en) * | 2022-08-18 | 2022-11-01 | 上海联元智能科技有限公司 | Intelligent breaker health degree diagnosis system based on AIoT |
-
2021
- 2021-02-07 CN CN202110174360.3A patent/CN112865558A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142748A (en) * | 2021-11-19 | 2022-03-04 | 广东福德电子有限公司 | Main circuit topology and control method of high-power direct-current power supply |
| CN115276238A (en) * | 2022-08-18 | 2022-11-01 | 上海联元智能科技有限公司 | Intelligent breaker health degree diagnosis system based on AIoT |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4689733A (en) | Method for reducing dynamic overvoltages in an alternating-current system to which a direct-current system is connected | |
| CN112865558A (en) | High-power adjustable DC power supply device | |
| CN203119316U (en) | Power electronic substation | |
| CN101071162A (en) | Current converter test circuit | |
| JPH0954623A (en) | Linkage type power converting device | |
| Zaja et al. | Coordination of mechanical DCCBs and temporary blocking of half bridge MMC | |
| CN114946114A (en) | Arc furnace power supply with converter circuit | |
| CN117674050B (en) | Short-circuit protection device and adjusting method for converter | |
| CN113809953A (en) | Variable frequency control system and method of fracturing unit and fracturing unit | |
| CN114400670A (en) | Voltage sag treatment device and implementation method | |
| CN214959323U (en) | High-power adjustable DC power supply device | |
| KR100973326B1 (en) | Harmonics absorptive power-factor improvement apparatus | |
| CN209299154U (en) | High-voltage rectifying system | |
| CN209104805U (en) | High voltage protective module | |
| CN108736747A (en) | A kind of high-power medium voltage DC source device and control method | |
| CN216599460U (en) | Frequency conversion control system of fracturing unit and fracturing unit | |
| CN114337335B (en) | Hybrid modular multilevel converter, control method and control device | |
| RU2284083C2 (en) | Device for compensation of one-phased capacity closing currents and for limiting internal overvoltages in high-voltage networks | |
| CN208226888U (en) | A kind of high-power medium voltage DC source device | |
| Zhou | Analysis on control and protection of MMC-based HVDC flexible transmission system | |
| CN209104816U (en) | Micro-capacitance sensor power supply system | |
| Sztykiel et al. | AC/DC converter with DC fault suppression for aircraft+/-270 VDC distribution systems | |
| CN219164236U (en) | Full compensation device using transformer for compensation | |
| CN220965173U (en) | High-pressure heater control system | |
| CN113339281B (en) | Nuclear power supply electromagnetic pump parallel drive controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |