CN109256951B - Direct-current voltage conversion device and control method thereof - Google Patents
Direct-current voltage conversion device and control method thereof Download PDFInfo
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- CN109256951B CN109256951B CN201811144825.5A CN201811144825A CN109256951B CN 109256951 B CN109256951 B CN 109256951B CN 201811144825 A CN201811144825 A CN 201811144825A CN 109256951 B CN109256951 B CN 109256951B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/285—Single converters with a plurality of output stages connected in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0074—Plural converter units whose inputs are connected in series
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a direct-current voltage conversion device and a manufacturing method thereof. The direct-current voltage conversion device is composed of a high-voltage end outlet current-limiting reactor and n low-voltage direct-current conversion units, wherein n is any positive integer. The high-voltage ends of the n low-voltage direct-current conversion units are connected in series and then connected with the current-limiting reactor in series, and the low-voltage ends are connected in parallel. The low-voltage direct current conversion unit is composed of a half-bridge module, an isolated DC/DC conversion module and a chopper circuit module in three stages. The invention also provides a corresponding fault current-limiting control method, which realizes the high-voltage and low-voltage short-circuit fault ride-through function of the direct-current voltage conversion device.
Description
Technical Field
The invention belongs to the technical field of electric power direct current power transmission and distribution, and relates to a direct current voltage conversion device and a control method thereof.
Background
With the application of direct current distribution, direct current transformation equipment with performance similar to that of an alternating current transformer needs to be researched, the fault ride-through capability of a direct current transformation device under the condition of a system short-circuit fault is deeply researched while direct current voltage transformation is realized, and the equipment has important research significance in the capability of rapidly recovering and restarting after the short-circuit fault is cleared.
In the field of application of direct-current power distribution networks, direct-current transformers based on a modular input-series output-parallel topological structure are widely researched, but the application of the topological direct-current transformer in a direct-current power distribution network still faces the following problems at present: (1) when a high-voltage end of the system has a short-circuit fault, a high-voltage side series module capacitor directly discharges in a short-circuit mode, the rising speed of short-circuit current is extremely high, a semiconductor device also has serious overcurrent, and the damage to the capacitor and the semiconductor device is large; (2) when short-circuit fault occurs at the low-voltage end of the conversion device, the low-voltage side parallel module capacitor directly performs short-circuit discharge, the rising speed of short-circuit current is extremely high, the semiconductor device can also generate serious overcurrent, the damage to the capacitor and the semiconductor device is large, and meanwhile, because the module capacitor performs short-circuit discharge, the power supply board card which obtains electricity from the capacitor outputs the undervoltage lock, the direct-current transformer is stopped in a fault mode, the fault ride-through function cannot be realized, in addition, because the peak value of the short-circuit current is extremely large, but the duration time is extremely short, the relay protection device of the low-voltage power grid cannot utilize the fault current characteristic to perform fault location.
The patent with the application number of CN201510097371.0 and the title of invention is 'a high frequency chain bidirectional DC transformer with switched capacitor access and a control method thereof', relates to a method for realizing redundancy design by adding a one-stage half-bridge converter at the front stage of a DC conversion unit. However, when the short-circuit fault occurs in the method, all the switch tubes need to be turned off, and the short-circuit current is zero when the short-circuit fault occurs, and the method has the following defects: the relay protection device in the direct current power grid cannot obtain fault current required by fault location, and a fault point cannot be removed, so that the direct current voltage conversion device and the direct current power distribution network trip and stop operation, the system has no fault ride-through capability, and large-scale engineering application of the direct current power distribution network is restricted.
Disclosure of Invention
The present invention aims to solve the above technical problems, and provides a dc voltage conversion apparatus and a control method thereof, so that an internal subunit thereof has the capability of limiting short-circuit fault current and quickly recovering a system after fault clearing, and fault ride-through of a dc power distribution network system is realized.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the direct-current voltage conversion device is composed of a high-voltage end outlet current-limiting reactor L1 and n low-voltage direct-current conversion units, wherein n is any positive integer, the input ends of the n low-voltage direct-current conversion units are connected in series and then connected in series with a current-limiting reactor L1 to serve as the high-voltage end of the direct-current voltage conversion device, and the output ends of the n low-voltage direct-current conversion units are connected in parallel to serve as the low-voltage end of the direct-current voltage conversion device.
The low-voltage direct current conversion unit is composed of a half-bridge module, an isolated DC/DC conversion module and a chopper circuit module in three stages. The input end of the half-bridge module is the input end of the low-voltage direct current conversion unit, the output end of the half-bridge module is connected with the input end of the isolated DC/DC conversion module, the output end of the isolated DC/DC conversion module is connected with the input end of the chopper circuit module, and the output end of the chopper circuit module is the output end of the low-voltage direct current conversion unit.
The half-bridge module comprises two full-controlled switch tubes that contain anti-parallel diode, and two upper and lower switch tube series connection constitute the half-bridge module, and the low tube both ends of half-bridge module are the input of half-bridge module, and two upper and lower switch tube series connection constitute the output of half-bridge module.
The isolated DC/DC conversion module comprises an inverter, a phase-shifting inductor, a high-frequency isolation transformer and a rectifier, wherein the DC side of the inverter and the DC side of the rectifier are both connected with a capacitor in parallel. The direct current side of the inverter is an input end of an isolated DC/DC conversion module, the alternating current side of the inverter is connected with the primary side of a high-frequency isolation transformer after being connected with the phase-shifting inductance link in series, the alternating current side of the rectifier is connected with the secondary side of the high-frequency isolation transformer, and the direct current side of the rectifier is an output end of the isolated DC/DC conversion module. The inverter and the rectifier respectively comprise four fully-controlled switch tubes with anti-parallel diodes, and the four fully-controlled switch tubes with the anti-parallel diodes are connected into a full-bridge structure.
The chopper circuit module is composed of two fully-controlled switch tubes with anti-parallel diodes and a current-sharing inductor, a half-bridge arm of the chopper circuit module is formed by connecting the two switch tubes in series from top to bottom and serves as the input end of the chopper circuit module, the output end anode of the chopper circuit module is formed by connecting the midpoint of the half-bridge arm and the current-sharing inductor in series, and the lower end of the lower switch tube serves as the output end cathode of the chopper circuit module.
The invention also provides a control method of the direct current voltage conversion device, which comprises the following steps:
a) under the normal working condition, the upper switch tube of the half-bridge module is conducted, the lower switch tube is turned off, the direct-current voltage at the high-voltage end is jointly borne by the direct-current sides of the inverters of the isolated DC/DC conversion modules connected in series, the switch tubes of the isolated DC/DC conversion modules are unlocked to operate, the power transmission is realized, the upper switch tube of the chopper circuit module is conducted, the lower switch tube is turned off, and the load power at the low-voltage end is jointly provided by the direct-current sides of the rectifiers of the isolated DC/DC conversion modules connected in parallel;
b) when a short-circuit fault occurs at a high-voltage end, the isolated DC/DC conversion module keeps an unlocking operation state, and controls the conduction duty ratio of an upper switching tube and a lower switching tube of a half-bridge module through a high-voltage end output current closed-loop regulation strategy or a hysteresis control strategy to limit the short-circuit fault current injected to a short-circuit point by the device within a constant value range;
c) after the fault is cleared, the switching tube on the half-bridge module is restored to the conducting state under the normal working condition, the switching tube on the half-bridge module is restored to the switching-off state under the normal working condition, and the direct-current voltage conversion device completes the rapid restoration after the fault is cleared, so that the high-voltage end short-circuit fault ride-through function is realized.
The invention also provides a control method of the direct current voltage conversion device, which comprises the following steps:
a) under the normal working condition, the upper switch tube of the half-bridge module is conducted, the lower switch tube is turned off, the direct-current voltage at the high-voltage end is jointly borne by the direct-current sides of the inverters of the isolated DC/DC conversion modules connected in series, the switch tubes of the isolated DC/DC conversion modules are unlocked to operate, the power transmission is realized, the upper switch tube of the chopper circuit module is conducted, the lower switch tube is turned off, and the load power at the low-voltage end is jointly provided by the direct-current sides of the rectifiers of the isolated DC/DC conversion modules connected in parallel;
b) when a short-circuit fault occurs at a low-voltage end, the isolated DC/DC conversion module keeps an unlocking operation state, controls the conduction duty ratio of a switching tube of a chopper circuit module through a low-voltage end output current closed-loop regulation strategy or a hysteresis control strategy, and limits the short-circuit fault current injected to a short-circuit point by a device within a fixed value range;
c) after the fault is cleared, the upper switch tube of the chopper circuit module is restored to the conducting state under the normal working condition, the lower switch tube is restored to the switching-off state under the normal working condition, and the direct-current voltage conversion device completes the recovery operation after the fault is cleared, so that the low-voltage end short-circuit fault ride-through function is realized.
Compared with the existing direct current voltage conversion device, the direct current voltage conversion device has the beneficial effects that:
(1) when a short-circuit fault occurs in the high-voltage end system, the isolated DC/DC conversion module keeps an unlocked operation state, the high-voltage series module is controlled by the half-bridge module to limit the capacitor discharge of the high-voltage series module, the fault current is limited, and after the fault is cleared, the system can quickly recover to normal operation, so that the device has the high-voltage end short-circuit fault ride-through capability, and the power supply reliability is greatly improved.
(2) When a short-circuit fault occurs in the low-voltage end system, the isolation type DC/DC conversion module keeps an unlocking operation state, the low-voltage parallel module is controlled by the chopper circuit module to limit the capacitor discharge of the low-voltage parallel module, the fault current is limited, and after the fault is cleared, the system can quickly recover to normal operation, so that the device has the low-voltage end short-circuit fault ride-through capability, and the power supply reliability is greatly improved.
(3) Compared with the scheme of the prior patent document, when short-circuit faults occur at the high-voltage end and the low-voltage end of the system, the switching tube of the device is not completely turned off, but the conduction duty ratio of the switching tube is adjusted through current limiting control, and certain short-circuit current is continuously injected into a short-circuit point, so that the relay protection device of the power distribution network is favorable for fault location, the fault point is accurately cleared, the direct-current power distribution network is quickly recovered to normally operate, and the fault ride-through problem of direct-current power distribution network equipment is solved.
Drawings
FIG. 1 is a topology block diagram of a DC voltage conversion device of the present invention;
fig. 2 is a topology structure diagram of a half bridge module in the dc voltage converting apparatus of the present invention.
Fig. 3 is a topology structure diagram of an isolated DC/DC conversion module in the DC voltage conversion device of the present invention.
Fig. 4 is a topology structure diagram of a chopper circuit module of the dc voltage converting apparatus of the present invention.
Fig. 5 is a short circuit fault current limit and switching tube drive waveform for the dc voltage conversion device of the present invention.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
The topological structure of the direct-current voltage conversion device is shown in figure 1 and comprises a high-voltage end outlet current-limiting reactor L1 and n low-voltage direct-current conversion units, wherein n is any positive integer, the input ends of the n low-voltage direct-current conversion units are connected in series and then connected in series with a current-limiting reactor L1 to serve as the high-voltage end of the direct-current voltage conversion device, and the output ends of the n low-voltage direct-current conversion units are connected in parallel to serve as the low-voltage end of the direct-current voltage conversion device.
The low-voltage direct current conversion unit is composed of a half-bridge module, an isolated DC/DC conversion module and a chopper circuit module in three stages. The input end of the half-bridge module is the input end of the low-voltage direct current conversion unit, the output end of the half-bridge module is connected with the input end of the isolated DC/DC conversion module, the output end of the isolated DC/DC conversion module is connected with the input end of the chopper circuit module, and the output end of the chopper circuit module is the output end of the low-voltage direct current conversion unit.
As shown in fig. 2, the half-bridge module of the low-voltage dc conversion unit is composed of two fully-controlled switching tubes S1 and S2 including antiparallel diodes, an upper tube S1 and a lower tube S2 are connected in series to form the half-bridge module, two ends of the lower tube S2 of the half-bridge module are input ends of the half-bridge module, and two ends of the lower tube S2 of the half-bridge module are connected in series to form an output end of the half-bridge module, S1 and S2 are.
As shown in fig. 3, the isolated DC/DC conversion module of the low-voltage DC conversion unit includes an inverter full-bridge module, a phase-shift inductor L, a high-frequency isolation transformer T, and a rectifier full-bridge module, wherein a DC side of the inverter full-bridge module is connected in parallel with a capacitor C1 and a DC side of the rectifier full-bridge module is connected in parallel with a capacitor C2., a DC side of the inverter is an input end of the isolated DC/DC conversion module, an ac side of the inverter is connected in series with the phase-shift inductor L and then is connected to a primary side of the high-frequency isolation transformer T, an ac side of the rectifier is connected to a secondary side of the high-frequency isolation transformer T, and a DC side of the rectifier is an output end of the isolated DC/DC conversion module.
As shown in fig. 4, the chopper circuit module of the low-voltage dc conversion unit is characterized by comprising two fully-controlled switching tubes S3 and S4 including anti-parallel diodes and a current-sharing inductor L2, wherein the two switching tubes are connected in series to form an input end of the chopper circuit module, a midpoint of a series bridge arm of S3 and S4 is connected in series with an inductor L2 to form an output end anode of the chopper circuit module, and an emitter of S4 is a cathode of the output end of the chopper circuit module.
The present invention further provides a method for controlling the dc voltage converting apparatus, including:
a) under the normal working condition, an upper switch tube S1 of the half-bridge module is conducted, a lower switch tube S2 is turned off, the direct-current voltage at the high-voltage end is jointly borne by a direct-current side capacitor of an inverter of the isolation type DC/DC conversion module which is connected in series, the switch tubes of the isolation type DC/DC conversion module are unlocked to operate, the power transmission is realized, an upper switch tube S3 of the chopper circuit module is conducted, a lower switch tube S4 is turned off, and the load power at the low-voltage end is jointly provided by the direct-current sides of rectifiers of the isolation type DC/DC conversion module which are connected in parallel;
b) when a short-circuit fault occurs at a high-voltage end, the isolated DC/DC conversion module keeps an unlocked operation state, and a short-circuit fault current injected to a short-circuit point by the device is limited within a fixed value range by a high-voltage end output current closed-loop regulation strategy or a hysteresis control strategy, wherein fig. 5 shows that when hysteresis control is adopted, a current waveform of the short-circuit current is limited within a 1.3 pu-1.5 pu rated current range and a driving signal of a switch tube S1, when S1 is switched on and S2 is switched off, the fault current rises, when the fault current reaches 1.5pu, S1 and S2 are switched off, the fault current starts to attenuate and decline, when the fault current falls to 1.3pu, S1 and S2 are switched on again, and the average value of the fault current is controlled to 1.4pu rated current through the hysteresis control, the relay protection device can perform differential overcurrent protection to perform fault location and fault clearing, in the chinese patent "a high-frequency link bidirectional dc transformer with switched capacitor access and control method thereof", a method is adopted in which all switching tubes are turned off when a short-circuit fault occurs, and a short-circuit current is zero when a short-circuit fault point occurs, so that a relay protection device in a dc power grid cannot obtain a fault current required for fault location, and thus cannot accurately remove the fault point;
c) after the fault is cleared, the switching tube S1 on the half-bridge module is restored to the conducting state under the normal working condition, the switching tube S2 on the half-bridge module is restored to the off state under the normal working condition, and the direct-current voltage conversion device completes the quick restoration after the fault is cleared, so that the high-voltage end short-circuit fault ride-through function is realized.
The present invention further provides a method for controlling the dc voltage converting apparatus, including:
a) under the normal working condition, an upper switch tube S1 of the half-bridge module is conducted, a lower switch tube S2 is turned off, the direct-current voltage at the high-voltage end is jointly borne by the direct-current sides of inverters of the isolation type DC/DC conversion modules connected in series, the switch tubes of the isolation type DC/DC conversion modules are unlocked to operate, the power transmission is realized, an upper switch tube S3 of the chopper circuit module is conducted, a lower switch tube S4 is turned off, and the load power at the low-voltage end is jointly provided by the direct-current sides of rectifiers of the isolation type DC/DC conversion modules connected in parallel;
b) when a short-circuit fault occurs at a low-voltage end, the isolation type DC/DC conversion module keeps an unlocking operation state, the on duty ratio of a chopper circuit module switching tube S3 is controlled through a low-voltage end output current closed-loop regulation strategy or a hysteresis control strategy, the short-circuit fault current injected to a short-circuit point by the device is limited within a fixed value range, FIG. 5 shows that when hysteresis control is adopted, the short-circuit current is limited within a current waveform within a rated current range of 1.3 pu-1.5 pu and a driving signal of a switching tube S3, when S3 is turned on and S4 is turned off, the fault current rises, when the fault current reaches 1.5pu, S3 and S4 are turned on, the fault current starts to decay and fall, when the fault current falls to 1.3pu, S3 and S4 are turned on again, the average value of the fault current is controlled to be 1.4pu rated current through the hysteresis control, and the relay protection device can perform differential protection to perform fault positioning and fault clearing, in the chinese patent "a high-frequency link bidirectional dc transformer with switched capacitor access and control method thereof", a method is adopted in which all switching tubes are turned off when a short-circuit fault occurs, and a short-circuit current is zero when a short-circuit fault point occurs, so that a relay protection device in a dc power grid cannot obtain a fault current required for fault location, and thus cannot accurately remove the fault point;
c) after the fault is cleared, the upper switch tube S3 of the chopper circuit module is restored to the conducting state under the normal working condition, the lower switch tube S4 is restored to the off state under the normal working condition, and the direct-current voltage conversion device completes the recovery operation after the fault is cleared, so that the low-voltage end short-circuit fault ride-through function is realized.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, which are only for illustrating the technical idea of the present invention and are not to be construed as limiting the scope of the present invention. Those of ordinary skill in the art will understand that: modifications and equivalents of the embodiments of the present invention may be made without departing from the spirit and scope of the invention as set forth in the claims below.
Claims (2)
1. The control method of a direct-current voltage conversion device comprises the steps that the direct-current voltage conversion device is composed of a high-voltage end outlet current-limiting reactor L1 and n low-voltage direct-current conversion units, wherein n is any positive integer, the input ends of the n low-voltage direct-current conversion units are connected in series and then connected in series with a current-limiting reactor L1 to serve as the high-voltage end of the direct-current voltage conversion device, and the output ends of the n low-voltage direct-current conversion units are connected in parallel to serve as the low-voltage end of the direct-current voltage conversion device;
the low-voltage direct current conversion unit consists of a half-bridge module, an isolated DC/DC conversion module and a chopper circuit module in three stages;
the input end of the half-bridge module is the input end of the low-voltage direct current conversion unit, the output end of the half-bridge module is connected with the input end of the isolated DC/DC conversion module, the output end of the isolated DC/DC conversion module is connected with the input end of the chopper circuit module, and the output end of the chopper circuit module is the output end of the low-voltage direct current conversion unit;
the control method is characterized by comprising the following steps:
a) under the normal working condition, the upper switch tube of the half-bridge module is conducted, the lower switch tube is turned off, the direct-current voltage at the high-voltage end is jointly borne by the direct-current sides of the inverters of the isolated DC/DC conversion modules connected in series, the switch tubes of the isolated DC/DC conversion modules are unlocked to operate, the power transmission is realized, the upper switch tube of the chopper circuit module is conducted, the lower switch tube is turned off, and the load power at the low-voltage end is jointly provided by the direct-current sides of the rectifiers of the isolated DC/DC conversion modules connected in parallel;
b) when a short-circuit fault occurs at a high-voltage end, the isolated DC/DC conversion module keeps an unlocking operation state, and controls the conduction duty ratio of an upper switching tube and a lower switching tube of a half-bridge module through a high-voltage end output current closed-loop regulation strategy or a hysteresis control strategy to limit the short-circuit fault current injected to a short-circuit point by the device within a constant value range;
c) after the fault is cleared, the switching tube on the half-bridge module is restored to the conducting state under the normal working condition, the switching tube on the half-bridge module is restored to the switching-off state under the normal working condition, and the direct-current voltage conversion device completes the rapid restoration after the fault is cleared, so that the high-voltage end short-circuit fault ride-through function is realized.
2. The control method of a direct-current voltage conversion device comprises the steps that the direct-current voltage conversion device is composed of a high-voltage end outlet current-limiting reactor L1 and n low-voltage direct-current conversion units, wherein n is any positive integer, the input ends of the n low-voltage direct-current conversion units are connected in series and then connected in series with a current-limiting reactor L1 to serve as the high-voltage end of the direct-current voltage conversion device, and the output ends of the n low-voltage direct-current conversion units are connected in parallel to serve as the low-voltage end of the direct-current voltage conversion device;
the low-voltage direct current conversion unit consists of a half-bridge module, an isolated DC/DC conversion module and a chopper circuit module in three stages;
the input end of the half-bridge module is the input end of the low-voltage direct current conversion unit, the output end of the half-bridge module is connected with the input end of the isolated DC/DC conversion module, the output end of the isolated DC/DC conversion module is connected with the input end of the chopper circuit module, and the output end of the chopper circuit module is the output end of the low-voltage direct current conversion unit;
the control method is characterized by comprising the following steps:
a) under the normal working condition, the upper switch tube of the half-bridge module is conducted, the lower switch tube is turned off, the direct-current voltage at the high-voltage end is jointly borne by the direct-current sides of the inverters of the isolated DC/DC conversion modules connected in series, the switch tubes of the isolated DC/DC conversion modules are unlocked to operate, the power transmission is realized, the upper switch tube of the chopper circuit module is conducted, the lower switch tube is turned off, and the load power at the low-voltage end is jointly provided by the direct-current sides of the rectifiers of the isolated DC/DC conversion modules connected in parallel;
b) when a short-circuit fault occurs at a low-voltage end, the isolated DC/DC conversion module keeps an unlocking operation state, controls the conduction duty ratio of a switching tube of a chopper circuit module through a low-voltage end output current closed-loop regulation strategy or a hysteresis control strategy, and limits the short-circuit fault current injected to a short-circuit point by a device within a fixed value range;
c) after the fault is cleared, the upper switch tube of the chopper circuit module is restored to the conducting state under the normal working condition, the lower switch tube is restored to the switching-off state under the normal working condition, and the direct-current voltage conversion device completes the recovery operation after the fault is cleared, so that the low-voltage end short-circuit fault ride-through function is realized.
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| US11888403B2 (en) * | 2019-01-29 | 2024-01-30 | United States Of America As Represented By The Secretary Of The Air Force | High-bandwidth analog-controlled DC breaker on DC/DC converter with galvanic isolation |
| US12003176B2 (en) * | 2019-06-07 | 2024-06-04 | Panasonic Intellectual Property Management Co., Ltd. | In-vehicle power supply system to detect failure for a bi-directional DC-DC converter's conversion circuit |
| CN110336470B (en) * | 2019-07-09 | 2021-09-03 | 许继电气股份有限公司 | Power electronic transformer system, transformer and fault ride-through control method thereof |
| CN110677026B (en) * | 2019-07-25 | 2021-04-20 | 西安交通大学 | Double-active-bridge-structure-based fault current limiting topology and current limiting method for solid-state transformer |
| DE102019120567A1 (en) | 2019-07-30 | 2021-02-04 | Bayerische Motoren Werke Aktiengesellschaft | Vehicle electrical system and method for protecting a vehicle electrical system |
| CN111245261A (en) * | 2020-03-11 | 2020-06-05 | 深圳供电局有限公司 | Low-voltage ride-through AC/DC converter and control method thereof |
| CN111669029B (en) * | 2020-07-14 | 2023-05-05 | 西南交通大学 | Fault reconstruction method for power electronic transformer system |
| CN117097132A (en) * | 2022-05-13 | 2023-11-21 | 华为数字能源技术有限公司 | Power conversion circuit and power supply system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283445A (en) * | 2013-07-12 | 2015-01-14 | 英飞凌科技奥地利有限公司 | Power Converter Circuit and Method |
| CN107769239A (en) * | 2017-09-11 | 2018-03-06 | 北京交通大学 | A kind of new alternating electromotive force electronic transformer topological structure |
| CN107834854A (en) * | 2017-11-24 | 2018-03-23 | 清华大学 | A kind of high-voltage large-capacity commutator transformer |
| CN107968572A (en) * | 2017-12-06 | 2018-04-27 | 浙江大学 | A kind of DC solid transformer and its control method with fault ride-through capacity |
| CN107966623A (en) * | 2017-10-25 | 2018-04-27 | 全球能源互联网研究院 | A kind of test method of modularization multi-level converter, apparatus and system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7782002B2 (en) * | 2004-09-08 | 2010-08-24 | Progressive Dynamics, Inc. | Power converter |
-
2018
- 2018-09-29 CN CN201811144825.5A patent/CN109256951B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283445A (en) * | 2013-07-12 | 2015-01-14 | 英飞凌科技奥地利有限公司 | Power Converter Circuit and Method |
| CN107769239A (en) * | 2017-09-11 | 2018-03-06 | 北京交通大学 | A kind of new alternating electromotive force electronic transformer topological structure |
| CN107966623A (en) * | 2017-10-25 | 2018-04-27 | 全球能源互联网研究院 | A kind of test method of modularization multi-level converter, apparatus and system |
| CN107834854A (en) * | 2017-11-24 | 2018-03-23 | 清华大学 | A kind of high-voltage large-capacity commutator transformer |
| CN107968572A (en) * | 2017-12-06 | 2018-04-27 | 浙江大学 | A kind of DC solid transformer and its control method with fault ride-through capacity |
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