CN114928255A - Alternating current-direct current broadband wide-voltage device and system access method thereof - Google Patents
Alternating current-direct current broadband wide-voltage device and system access method thereof Download PDFInfo
- Publication number
- CN114928255A CN114928255A CN202210653919.5A CN202210653919A CN114928255A CN 114928255 A CN114928255 A CN 114928255A CN 202210653919 A CN202210653919 A CN 202210653919A CN 114928255 A CN114928255 A CN 114928255A
- Authority
- CN
- China
- Prior art keywords
- voltage
- switch
- current
- bridge
- double
- 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
- 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
- H02M5/42—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 static 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- 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
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
-
- 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
- H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
-
- 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
- H02M5/42—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 static converters
- H02M5/44—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 static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—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 static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—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 static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—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 static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- 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
-
- 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
- H02M7/21—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 triode or transistor type requiring continuous application of a control signal
- H02M7/217—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2173—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
-
- 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
- H02M7/21—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 triode or transistor type requiring continuous application of a control signal
- H02M7/217—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses an alternating current-direct current broadband voltage-spreading device and a system access method thereof. One end of an input switch S1 is connected with an input system, the other end is connected with a starting resistor R and one end of a bypass switch S2, the other end of the starting resistor R is connected with the other end of the bypass switch S2 and then connected with one end of a multi-winding transformer, the other end of the multi-winding transformer is connected with one end of a converter valve, the other end of the converter valve is connected with one end of an output transformer and one end of a direct current switch S4, the other end of the output transformer is connected with one end of an output switch S3, the other end of the direct current switch S4 serves as a direct current output end and is connected with an external direct current system, and the other end of the output switch S3 is connected with the external alternating current system. The alternating current-direct current broadband voltage-spreading device can realize the multiplexing test of low-frequency, power-frequency and medium-frequency alternating current and direct current equipment, effectively reduce the equipment investment and improve the utilization rate of the device.
Description
Technical Field
The invention belongs to the technical field of power systems, and relates to an alternating current-direct current broadband wide-voltage device and a system access method thereof.
Background
Under the development of a novel power system, high-proportion new energy and high-proportion power electronics have more and more obvious double-high characteristics, the influence of power electronic equipment on the power system is gradually deepened, the power electronic equipment relates to the fields of power frequency alternating current, direct current, low-frequency alternating current and the like, and in the future, the application of power electronic equipment such as medium-frequency alternating current and the like is a trend.
At present, test tests are performed on alternating current and direct current equipment, multiple sets of devices are often adopted for detection, equipment investment is large, and utilization rate is low. It is necessary to develop a set of multiplexing test device for low-frequency, power-frequency, medium-frequency alternating current and direct current.
Disclosure of Invention
Aiming at the problems, the invention provides an alternating current-direct current broadband wide voltage device, which realizes the multiplexing test of low-frequency, power-frequency and medium-frequency alternating current and direct current equipment so as to effectively reduce the equipment investment and improve the utilization rate of the device; in addition, a corresponding system access method is provided for the requirements of online access and off-network access of the alternating current and direct current broadband wide-voltage device in an alternating current and direct current system, so that the device can be stably accessed and started without impact.
Therefore, the technical scheme adopted by the invention is as follows: an alternating current-direct current wide-band voltage-spreading device comprises an input switch S1, a starting resistor R, a bypass switch S2, a multi-winding transformer, a converter valve, an output transformer, an output switch S3 and a direct current switch S4;
one end of the input switch S1 is connected with an input system, the other end is connected with a starting resistor R and one end of a bypass switch S2, the other end of the starting resistor R is connected with the other end of the bypass switch S2 and then connected with one end of a multi-winding transformer, the other end of the multi-winding transformer is connected with one end of a converter valve, the other end of the converter valve is connected with one end of an output transformer and one end of a direct current switch S4, the other end of the output transformer is connected with one end of an output switch S3, the other end of the direct current switch S4 serves as a direct current output end and is connected with an external direct current system, and the other end of the output switch S3 is connected with an external alternating current system.
The alternating current frequency of the input system connected with the alternating current-direct current wide-frequency wide-voltage device is generally 50Hz or 60Hz, and the alternating current frequency range output by the alternating current-direct current wide-frequency wide-voltage device is wide, such as 15 Hz-200 Hz.
Furthermore, the converter valve adopts a three-phase independent mode, and each phase is formed by cascading a plurality of double H-bridge modules.
Furthermore, each phase of the converter valve comprises an upper output port and a lower output port besides the electromagnetic coupling with the multi-winding transformer, wherein the upper output port is connected with the corresponding phase of the output transformer, and the lower output port is directly connected with the lower output ports of other phases.
Furthermore, the double-H-bridge module comprises a filtering unit, an active front-end H-bridge, a capacitor and an inverter H-bridge, the filtering unit is composed of an inductor, the active front-end H-bridge and the inverter H-bridge are composed of 4 IGBTs and anti-parallel diodes thereof, a secondary winding of the multi-winding transformer is connected with the filtering unit in the double-H-bridge module, and then the active front-end H-bridge, the capacitor and the inverter H-bridge are sequentially connected.
The alternating current active system access method of the alternating current-direct current broadband wide-voltage device comprises the following steps:
(1) the input switch S1 is closed, and the capacitors in all the double H-bridge modules of the converter valve are charged;
(2) when the charging current is small and is almost zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
(3) unlocking active front-end H-bridges in all double H-bridge modules in a constant direct-current voltage control mode, and controlling the capacitance of all the modules to be a certain set direct-current voltage Udc after unlocking;
(4) unlocking all the inverted H bridges in the double H bridge modules in a constant alternating voltage and constant frequency control mode, and cascading and outputting alternating voltage and current waveforms with different frequencies in any controllable range by each module according to different inverted modulation strategies;
(5) in a concerted manner, the output switch S3 is closed;
(6) and after the output switch S3 is closed, the control mode is switched from constant-alternating-current voltage constant-frequency control to constant-active-power constant-reactive-power control, and corresponding active power and reactive power command values are adjusted.
The alternating current passive system access method of the alternating current-direct current wide-frequency wide-voltage device comprises the following steps:
(1) the input switch S1 is closed, and the capacitors in all the double H-bridge modules of the converter valve are charged;
(2) when the charging current is small and is almost zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
(3) unlocking active front-end H bridges in all the double H bridge modules in a constant direct-current voltage control mode, and controlling the capacitors of all the modules to be at a certain set direct-current voltage Udc after unlocking;
(4) unlocking all the inverted H bridges in the double H bridge modules in a constant alternating voltage and constant frequency control mode, and cascading and outputting alternating voltage and current waveforms with different frequencies in any controllable range by each module according to different inverted modulation strategies;
(5) the output switch S3 is closed.
The direct current active system access method of the alternating current-direct current wide-frequency voltage-spreading device comprises the following steps:
(1) the input switch S1 is closed, and the capacitors in all the double H-bridge modules of the converter valve are charged;
(2) when the charging current is small and is almost zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
(3) unlocking active front-end H-bridges in all double H-bridge modules in a constant direct-current voltage control mode, and controlling the capacitance of all the modules to be a certain set direct-current voltage Udc after unlocking;
(4) closing the dc switch S4;
(5) and unlocking all the inverse H bridges in the double H bridge modules in the constant active power control mode, and adjusting corresponding power instruction values.
The direct current passive system access method of the alternating current-direct current broadband wide-voltage device comprises the following steps:
(1) the input switch S1 is closed, and the capacitors in all the double H-bridge modules of the converter valve are charged;
(2) when the charging current is small and is almost zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
(3) unlocking active front-end H-bridges in all double H-bridge modules in a constant direct-current voltage control mode, and controlling the capacitance of all the modules to be a certain set direct-current voltage Udc after unlocking;
(4) unlocking all the inverse H bridges in the double H bridge modules in a constant direct-current voltage control mode;
(5) closing the dc switch S4.
Furthermore, in the active front-end H-bridge in all the dual-H-bridge modules unlocked in the constant dc voltage control mode, the trigger signals of four IGBTs in the active front-end H-bridge are formed by making a difference between a module dc voltage command value and a module dc voltage measured value, passing through a PI controller, and comparing with a triangular modulation wave, so as to realize the control of the dc voltage.
Furthermore, the inverter H bridges in all the double H bridge modules are unlocked in a constant alternating voltage and constant frequency control mode, after the difference is made between the alternating voltage instruction value and the measured value, the trigger pulses of four IGBTs in the inverter H bridge are formed after the PI controller and the Space Vector Pulse Width Modulation (SVPWM), and the control of the alternating voltage with different frequencies is realized.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) the alternating current-direct current broadband wide-voltage device provided by the invention can realize the multiplexing test of low-frequency, power-frequency and medium-frequency alternating current and direct current equipment, effectively reduces the equipment investment and improves the utilization rate of the device.
(2) The system access method of the alternating current-direct current broadband wide-voltage device can meet the requirements of on-line access and off-network access of the device in the alternating current-direct current system, and achieves impact-free stable access and starting of the device.
Drawings
Fig. 1 is a schematic structural view of an ac/dc wide-band voltage-spreading device according to the present invention;
FIG. 2 is a schematic structural diagram of a double H-bridge module of the AC/DC broadband wide voltage device of the present invention;
fig. 3 is a flowchart of a system access method of the ac/dc broadband voltage spreading device according to the present invention.
Detailed Description
To describe the present invention more specifically, the following detailed description of the technical solution of the present invention and the related principles thereof are provided with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic structural diagram of an ac/dc broadband voltage-spreading device, and it can be seen from the diagram that the ac/dc broadband voltage-spreading device includes an input switch S1, a starting resistor R, a bypass switch S2, a multi-winding transformer, a converter valve, an output transformer, an output switch S3, a dc switch S4, and related auxiliary devices. One end of an input switch S1 is connected with an input system, the other end of the input switch S1 is connected with one end of a starting resistor R and one end of a bypass switch S2, the other end of the starting resistor R is connected with the other end of a bypass switch S2 and then is connected with one end of a multi-winding transformer, the other end of the multi-winding transformer is connected with one end of a converter valve, the other end of the converter valve is connected with one end of an output transformer and one end of a direct current switch S4, the other end of the output transformer is connected with one end of an output switch S3, the other end of a direct current switch S4 serves as a direct current output end and is connected with an external direct current system, and the other end of the output switch S3 is connected with an external alternating current system.
The alternating current frequency of an input system connected with the alternating current-direct current broadband wide voltage device is generally 50Hz or 60Hz, and the alternating current frequency range output by the alternating current-direct current broadband wide voltage device is wide, such as 15 Hz-200 Hz.
The converter valve adopts a three-phase independent mode, and each phase is formed by cascading a plurality of double H-bridge modules. Besides the electromagnetic coupling with the multi-winding transformer, each phase also comprises an upper output port and a lower output port, wherein the upper output port is connected with the corresponding phase of the output transformer, and the lower output port is directly connected with the lower output ports of other phases.
Fig. 2 is a schematic structural diagram of a double H-bridge module of the ac/dc broadband voltage-spreading device, and it can be seen from the diagram that the double H-bridge module contains a filtering unit, an active front-end H-bridge, a capacitor and an inverter H-bridge. The filtering unit is composed of an inductor, the active front end H bridge is composed of 4 IGBTs and anti-parallel diodes thereof, and the inverter H bridge is composed of 4 IGBTs and anti-parallel diodes thereof. One secondary side of the multi-winding transformer is connected with a filter unit in a double H-bridge module, and then an active front-end H-bridge, a capacitor and an inverter H-bridge are sequentially connected.
Fig. 3 is a flow chart of a system access method of the ac/dc wide bandwidth voltage regulator, which can be seen from the figure, when an ac active system is accessed, the method is divided into four cases:
(1) closing the input switch S1 and charging the capacitors in all of the dual H-bridge modules;
(2) when the charging current is small and is almost zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
(3) unlocking active front-end H-bridges in all double H-bridge modules in a constant direct-current voltage control mode, and controlling the capacitance of all the modules to be a certain set direct-current voltage Udc after unlocking;
(4) unlocking all the inverted H bridges in the double H bridge modules in a constant alternating voltage and constant frequency control mode, and cascading and outputting alternating voltage and current waveforms with different frequencies in any controllable range by each module according to different inverted modulation strategies;
(5) in a concerted manner, the output switch S3 is closed;
(6) immediately after the output switch S3 is closed, the control mode is switched from constant AC voltage and constant frequency control to constant active power and constant reactive power control, and corresponding active power and reactive power command values are adjusted.
When an alternating current passive system is accessed:
(1) closing the input switch S1 and charging the capacitors in all of the dual H-bridge modules;
(2) when the charging current is small and is almost zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
(3) unlocking active front-end H bridges in all the double H bridge modules in a constant direct-current voltage control mode, and controlling the capacitors of all the modules to be at a certain set direct-current voltage Udc after unlocking;
(4) unlocking all the inverted H bridges in the double H bridge modules in a constant alternating voltage and constant frequency control mode, and cascading and outputting alternating voltage and current waveforms with different frequencies in any controllable range by each module according to different inverted modulation strategies;
(5) the output switch S3 is closed.
When accessing a direct current active system:
(1) closing the input switch S1 and charging the capacitors in all of the dual H-bridge modules;
(2) when the charging current is small and is almost zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
(3) unlocking active front-end H bridges in all the double H bridge modules in a constant direct-current voltage control mode, and controlling the capacitors of all the modules to be at a certain set direct-current voltage Udc after unlocking;
(4) closing the dc switch S4;
(5) and unlocking all the inverse H bridges in the double H bridge modules in the constant active power control mode, and adjusting corresponding power instruction values.
When a direct current passive system is accessed:
(1) closing the input switch S1, and charging the capacitors in all the double H-bridge modules;
(2) when the charging current is small and is almost zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
(3) unlocking active front-end H-bridges in all double H-bridge modules in a constant direct-current voltage control mode, and controlling the capacitance of all the modules to be a certain set direct-current voltage Udc after unlocking;
(4) unlocking all the inverse H bridges in the double H bridge modules in a constant direct-current voltage control mode;
(5) closing the dc switch S4.
In addition, in the active front-end H bridge in all double H bridge modules, the direct-current voltage command value and the direct-current voltage measured value of the module are subjected to difference in a constant direct-current voltage control mode, and then are compared with a triangular modulation wave after passing through a PI controller, trigger signals of four IGBTs in the active front-end H bridge are formed, and the direct-current voltage is controlled.
And unlocking the inverter H bridges in all the double H bridge modules in a constant alternating voltage and constant frequency control mode, performing difference between an alternating voltage instruction value and a measured value, forming trigger pulses of four IGBTs in the inverter H bridge after the difference is processed by a PI controller and Space Vector Pulse Width Modulation (SVPWM), and realizing control on alternating voltages with different frequencies.
Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. An alternating current-direct current broadband wide-voltage device is characterized by comprising an input switch S1, a starting resistor R, a bypass switch S2, a multi-winding transformer, a converter valve, an output transformer, an output switch S3 and a direct current switch S4;
one end of the input switch S1 is connected with an input system, the other end of the input switch S1 is connected with one end of a starting resistor R and one end of a bypass switch S2, the other end of the starting resistor R is connected with the other end of a bypass switch S2 and then connected with one end of a multi-winding transformer, the other end of the multi-winding transformer is connected with one end of a converter valve, the other end of the converter valve is connected with one end of an output transformer and one end of a direct current switch S4, the other end of the output transformer is connected with one end of an output switch S3, the other end of a direct current switch S4 serves as a direct current output end and is connected with an external direct current system, and the other end of the output switch S3 is connected with an external alternating current system.
2. The ac/dc wide-band voltage-spreading device according to claim 1, wherein said converter valve is a three-phase independent converter valve, each phase being formed by cascading a plurality of double H-bridge modules.
3. The ac/dc wide-band voltage spreading device according to claim 2, wherein each phase of the converter valve has an upper output port and a lower output port, in addition to the electromagnetic coupling with the multi-winding transformer, wherein the upper output port is connected to the corresponding phase of the output transformer, and the lower output port is directly connected to the lower output ports of the other phases.
4. The ac/dc broadband voltage spreading device according to claim 2, wherein the dual H-bridge module comprises a filtering unit, an active front-end H-bridge, a capacitor and an inverter H-bridge, the filtering unit is composed of an inductor, the active front-end H-bridge and the inverter H-bridge are composed of 4 IGBTs and their anti-parallel diodes, a secondary winding of the multi-winding transformer is connected to the filtering unit in the dual H-bridge module, and then the active front-end H-bridge, the capacitor and the inverter H-bridge are connected in sequence.
5. The system access method of the ac/dc broadband voltage spreading device according to any one of claims 1 to 4, wherein an ac active system access method is adopted, comprising the steps of:
1) the input switch S1 is closed, and the capacitors in all the double H-bridge modules of the converter valve are charged;
2) when the charging current is nearly zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
3) unlocking active front-end H-bridges in all the double H-bridge modules in a constant direct-current voltage control mode, and controlling the capacitors of all the double H-bridge modules to be at a certain set direct-current voltage Udc after unlocking;
4) unlocking all the inverted H bridges in the double H bridge modules in a constant alternating voltage and constant frequency control mode, and cascading and outputting alternating voltage and current waveforms with different frequencies in any controllable range by each module according to different inverted modulation strategies;
5) in a concerted manner, the output switch S3 is closed;
6) and after the output switch S3 is closed, the control mode is switched from constant-alternating-current voltage constant-frequency control to constant-active-power constant-reactive-power control, and corresponding active power and reactive power command values are adjusted.
6. The system access method of the ac/dc broadband voltage spreading device according to any one of claims 1 to 4, wherein an ac passive system access method is adopted, comprising the steps of:
1) the input switch S1 is closed, and the capacitors in all the double H-bridge modules of the converter valve are charged;
2) when the charging current is nearly zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
3) unlocking active front-end H-bridges in all the double H-bridge modules in a constant direct-current voltage control mode, and controlling the capacitors of all the double H-bridge modules to be at a certain set direct-current voltage Udc after unlocking;
4) unlocking all the inversion H-bridges in the double H-bridge modules in a constant alternating voltage and constant frequency control mode, and enabling each module to output alternating voltage and current waveforms with different frequencies in any controllable range in a cascade mode according to different inversion modulation strategies;
5) the output switch S3 is closed.
7. The system access method of the ac/dc broadband voltage spreading device according to any one of claims 1 to 4, wherein the dc active system access method is adopted, and comprises the steps of:
1) the input switch S1 is closed, and the capacitors in all the double H-bridge modules of the converter valve are charged;
2) when the charging current is nearly zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
3) unlocking active front-end H-bridges in all the double H-bridge modules in a constant direct-current voltage control mode, and controlling the capacitors of all the double H-bridge modules to be at a certain set direct-current voltage Udc after unlocking;
4) closing the dc switch S4;
5) and unlocking all the inverse H bridges in the double H bridge modules in the constant active power control mode, and adjusting corresponding power instruction values.
8. The system access method of the ac/dc broadband voltage spreading device according to any one of claims 1 to 4, wherein the dc passive system access method is adopted, and comprises the steps of:
1) the input switch S1 is closed, and the capacitors in all the double H-bridge modules of the converter valve are charged;
2) when the charging current is nearly zero, the bypass switch S2 is closed, and the starting resistor R is bypassed;
3) unlocking active front-end H bridges in all the double H bridge modules in a constant direct-current voltage control mode, and controlling the capacitors of all the double H bridge modules to be at a certain set direct-current voltage Udc after unlocking;
4) unlocking all the inverse H bridges in the double H bridge modules in a constant direct-current voltage control mode;
5) closing the dc switch S4.
9. The ac/dc broadband wide voltage device system access method according to any one of claims 5 to 8, wherein the constant dc voltage control mode is used to unlock all active front end H-bridges in the dual H-bridge module, and the dc voltage control is implemented by performing a difference between a module dc voltage command value and a module dc voltage measured value, passing through a PI controller, and comparing with a triangular modulation wave to form trigger signals of four IGBTs in the active front end H-bridge.
10. The AC/DC broadband wide-voltage device system access method according to claim 5 or 6, wherein the inverter H bridges in all the double H bridge modules are unlocked in a constant AC voltage and constant frequency control mode, and after a difference is made between an AC voltage command value and a measured value, the AC voltage command value and the measured value are subjected to PI controller and Space Vector Pulse Width Modulation (SVPWM), trigger pulses of four IGBTs in the inverter H bridge are formed, so that control over AC voltages with different frequencies is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210653919.5A CN114928255A (en) | 2022-06-10 | 2022-06-10 | Alternating current-direct current broadband wide-voltage device and system access method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210653919.5A CN114928255A (en) | 2022-06-10 | 2022-06-10 | Alternating current-direct current broadband wide-voltage device and system access method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114928255A true CN114928255A (en) | 2022-08-19 |
Family
ID=82815340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210653919.5A Pending CN114928255A (en) | 2022-06-10 | 2022-06-10 | Alternating current-direct current broadband wide-voltage device and system access method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114928255A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111630A (en) * | 2023-04-10 | 2023-05-12 | 国网浙江省电力有限公司电力科学研究院 | Capacity increasing method for power transmission line |
-
2022
- 2022-06-10 CN CN202210653919.5A patent/CN114928255A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111630A (en) * | 2023-04-10 | 2023-05-12 | 国网浙江省电力有限公司电力科学研究院 | Capacity increasing method for power transmission line |
| CN116111630B (en) * | 2023-04-10 | 2023-09-08 | 国网浙江省电力有限公司电力科学研究院 | Capacity increasing method for power transmission line |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| McGrath et al. | Natural capacitor voltage balancing for a flying capacitor converter induction motor drive | |
| US8471514B2 (en) | Adaptive harmonic reduction apparatus and methods | |
| CN103701350A (en) | Modular multi-level converter capacitor voltage fluctuation inhibition method under low-frequency working condition | |
| CN102082436B (en) | Hybrid power filter | |
| Li et al. | Variable switching frequency PWM strategy of two-level rectifier for DC-link voltage ripple control | |
| CN110943469B (en) | Single-stage energy storage converter and control method thereof | |
| Heris et al. | A new shunt active power filter based on indirect matrix converter | |
| CN114928255A (en) | Alternating current-direct current broadband wide-voltage device and system access method thereof | |
| CN103929084A (en) | Modular multilevel converter low-frequency control method based on resonant filter circuit | |
| Thomas et al. | Performance evaluation of three phase three and four wire active filters | |
| CN111740614A (en) | Y-source two-stage matrix converter analysis method based on state space average model | |
| Klaassens et al. | Phase-staggering control of a series-resonant DC-DC converter with paralleled power modules | |
| US20240186915A1 (en) | Constant-frequency single-carrier sensor-less modulation for the three level flying capacitor multicell converter | |
| Quan et al. | Design of interleaved converters with minimum filtering requirement | |
| CN115954924A (en) | Multi-port flexible loop closing switch and control method thereof | |
| CN115765516A (en) | Bidirectional energy storage converter and bidirectional power supply | |
| CN115128348A (en) | Disturbance voltage injection device for impedance measurement and control method | |
| Lin et al. | Single-phase neutral point clamped AC/DC converter with the function of power factor corrector and active filter | |
| Buyuk et al. | Performance evaluation of LLCL filter for active power filter | |
| Parkatti et al. | A novel vector controlled current source shunt active power filter with reduced component voltage stresses | |
| Smith et al. | Design and implementation of a smart solid-state transformer based power converter for solar PV system | |
| Deng et al. | Virtual Capacitors and Resistors Control for Isolated AC-DC Matrix Converter | |
| Daneshmandi et al. | Hysteresis Band Current Controller for 12-Pulse Rectifier with less Than 3% Current THD Under Variable Loads | |
| Varaprasad et al. | Power Quality Improvement using Dynamic Voltage Restorer (DVR) | |
| Rodrigues et al. | Universal active power filters based on nine-leg converter |
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 |