CN109067165B - High-voltage direct-current power electronic transformer starting method based on self-excitation mode - Google Patents
High-voltage direct-current power electronic transformer starting method based on self-excitation mode Download PDFInfo
- Publication number
- CN109067165B CN109067165B CN201811017162.0A CN201811017162A CN109067165B CN 109067165 B CN109067165 B CN 109067165B CN 201811017162 A CN201811017162 A CN 201811017162A CN 109067165 B CN109067165 B CN 109067165B
- Authority
- CN
- China
- Prior art keywords
- voltage
- direct current
- power unit
- power
- electrified
- 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.)
- Active
Links
- 238000002955 isolation Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 description 4
- 230000002457 bidirectional Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping 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
- 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
Abstract
The invention provides a high-voltage direct current-direct current power electronic transformer starting method based on a self-excitation mode, wherein only one side of a transformer is electrified in a ready state, and the other side is not electrified to enter a normal operation state through a control strategy in the starting process; the starting process is suitable for two different conditions of high-voltage side electrification and low-voltage side electrification. The high-voltage isolation scheme that the direct current side power taking mode is adopted, the high-cost external power supply for the controller is avoided, and the high-voltage isolation method has practical value. The transformer is enabled to enter a normal operation state without an electric module on the other side through a control strategy in a state that only one side of the transformer is electrified, and meanwhile, the problem of current impact in the starting process is avoided. The power supply control problem of a high-voltage direct current-direct current power electronic transformer (DCSST) is solved.
Description
Technical Field
The invention relates to the technical field of high-voltage direct-current power electronic transformers, in particular to a high-voltage direct-current power electronic transformer starting method based on a self-excitation mode.
Background
With the development of electric vehicles, distributed power generation, energy storage systems, renewable energy power generation and other fields, the demand for direct application of high-voltage direct-current power transmission to electric equipment is continuously increasing. Therefore, a dc transformer device with a function similar to that of the ac isolation transformer is required to convert the high-voltage dc power into isolated dc voltages of different levels to satisfy various electric devices. The high-voltage direct-current power electronic transformer can directly meet a part of users needing direct current, does not need to use a power frequency transformer to convert electric energy, reduces cost and loss, and can realize bidirectional flow of energy. With the rapid development of direct current power transmission and distribution, the high-voltage direct current-direct current power electronic transformer has a wide application prospect in direct current power distribution.
The invention relates to a high-voltage direct current-direct current power electronic transformer (DCSST), which connects a modularized double-active full bridge (DAB) power unit in an input-series output-parallel (ISOP) mode, and realizes the output of specific voltage by controlling the on and off of an IGBT electronic switching device on the power unit. The DAB power unit of direct current transformer adopts the structure of symmetry, and the left side is H full-bridge contravariant structure, and the right side is H full-bridge rectification structure, and the centre couples together through high frequency transformer, has realized electrical isolation. The power transmission device has the advantages of bidirectional power transmission, modular structure, high power density, easy realization of soft switching technology and the like.
If the direct current transformer adopts a mode of supplying power to the controller from the outside, the high-voltage isolation cost is high, so that a direct current side direct power taking mode is adopted. Before starting, one side of the direct current transformer is electrified, the other side of the direct current transformer is uncharged, and the following problems need to be solved before the transformer is in a ready state: how to let the non-electrified side module enter a normal operation mode; how to avoid the current impact problem in the starting process.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a high-voltage direct-current power electronic transformer starting method based on a self-excitation mode, and solves the power supply control problem of a high-voltage direct-current power electronic transformer (DCSST).
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-voltage direct current-direct current power electronic transformer starting method based on a self-excitation mode is characterized in that the high-voltage direct current-direct current power electronic transformer is a double-active full-bridge DC-DC converter, and a DAB unit of the DC-DC converter is of a symmetrical structure formed by connecting two power units through a middle high-frequency isolation transformer; before starting, the two power units are divided into a power unit on the charged side and a power unit on the non-charged side.
The starting method of the high-voltage direct current-direct current power electronic transformer comprises the following steps:
step one, connecting a direct current end of a power unit on a charged side to a direct current end of a power unit on a non-charged side through a diode uncontrollable rectifier bridge;
step two, the power unit on the electrified side opens the internal phase shift angle slowly at the speed of 1 degree every 4-5ms, and the power unit on the electrified side slowly charges the direct current end of the power unit on the non-electrified side through the diode rectifier bridge until the voltage of the power unit on the non-electrified side reaches the voltage of the control board and can normally work; the charging control at this time is in an open loop mode;
locking an internal phase shift angle of a power unit on the electrified side to ensure overvoltage on the non-electrified side;
after the control board of the charged side power unit works normally, the charged side unit realizes voltage closed-loop control of the non-charged side unit through internal phase angle regulation, so that the voltage reaches 380V, and at the moment, the non-charged side unit IGBT keeps a locking state;
step five, disconnecting the uncontrollable rectifier bridge of the diode;
step six, the power unit on the charged side performs voltage closed-loop charging control on the power unit on the non-charged side through internal phase angle regulation, at the moment, the power unit on the non-charged side is unlocked, the internal phase angle is opened slowly to the maximum at the speed of 1 degree every 4-5ms, and the power units on the two sides are in a running state;
and step seven, when the internally-shifted phase angles of the power unit on the charged side and the power unit on the non-charged side are both opened to the maximum, the power unit is switched to the externally-shifted phase angle control of the two power units to realize the voltage closed-loop charging of the power units until the operating voltage requirement of the power unit on the non-charged side is met.
Compared with the prior art, the invention has the beneficial effects that:
1. the problem of the control power supply of a high-voltage direct current-direct current power electronic transformer (DCSST) is solved, a direct current side direct power taking mode is adopted, a high-voltage isolation scheme that the controller is powered by the outside with high use cost is avoided, and the high-voltage direct current power electronic transformer has practical value.
2. The transformer is enabled to enter a normal operation state without an electric module on the other side through a control strategy in a state that only one side of the transformer is electrified, and meanwhile, the problem of current impact in the starting process is avoided.
3. In the invention, only one side of the transformer is electrified in a ready state, and the other side is not electrified to enter a normal operation state through a control strategy in the starting process; the starting process is suitable for two different conditions of high-voltage side electrification and low-voltage side electrification.
Drawings
Fig. 1 is a dc-dc power electronic transformer (DCSST) topology;
FIG. 2 is a high frequency isolated dual active full bridge power unit (DAB) block diagram;
FIG. 3 is a graph of voltage change during a first phase and a second phase of activation;
fig. 4 is a graph of voltage change during the second and third phases of the start-up.
In the figure: 1-first charge phase voltage waveform 2-second charge phase voltage waveform 3-third charge phase voltage waveform.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
A high-voltage direct current-direct current power electronic transformer starting method based on a self-excitation mode is characterized in that the high-voltage direct current-direct current power electronic transformer is a double-active full-bridge DC-DC converter, and a DAB unit of the DC-DC converter is of a symmetrical structure formed by connecting two power units through a middle high-frequency isolation transformer; before starting, the two power units are divided into a power unit on the charged side and a power unit on the non-charged side.
As shown in fig. 1, the topology of a high voltage direct current-direct current power electronic transformer (DCSST) is based on a high frequency isolation dual active full bridge DC/DC converter (DAB). The high-voltage side of the DCSST is connected in series by adopting a DAB unit high-voltage port, and the low-voltage side is connected in parallel by adopting a DAB power unit low-voltage port.
As shown in fig. 2, a structure diagram of a DAB unit of DCSST is shown in a symmetrical manner.
The starting method of the high-voltage direct current-direct current power electronic transformer comprises the following steps:
step one, connecting a direct current end of a power unit on a charged side to a direct current end of a power unit on a non-charged side through a diode uncontrollable rectifier bridge;
step two, the power unit on the electrified side opens the internal phase shift angle slowly at the speed of 1 degree every 4-5ms, and the power unit on the electrified side slowly charges the direct current end of the power unit on the non-electrified side through the diode rectifier bridge until the voltage of the power unit on the non-electrified side reaches the voltage of the control board and can normally work; the charging control at this time is in an open loop mode;
locking an internal phase shift angle of a power unit on the electrified side to ensure overvoltage on the non-electrified side;
after the control board of the charged side power unit works normally, the charged side unit realizes voltage closed-loop control of the non-charged side unit through internal phase angle regulation, so that the voltage reaches 380V, and at the moment, the non-charged side unit IGBT keeps a locking state;
step five, disconnecting the uncontrollable rectifier bridge of the diode;
step six, the power unit on the charged side performs voltage closed-loop charging control on the power unit on the non-charged side through internal phase angle regulation, at the moment, the power unit on the non-charged side is unlocked, the internal phase angle is opened slowly to the maximum at the speed of 1 degree every 4-5ms, and the power units on the two sides are in a running state;
and step seven, when the internally-shifted phase angles of the power unit on the charged side and the power unit on the non-charged side are both opened to the maximum, the power unit is switched to the externally-shifted phase angle control of the two power units to realize the voltage closed-loop charging of the power units until the operating voltage requirement of the power unit on the non-charged side is met.
In the above charging start-up process:
(1) the first to the third steps are a first charging stage, the achieved charging voltage is the working voltage of the control panel, and is about 180-200V;
(2) the fourth step is a second charging stage, and the charging voltage is 380V;
(3) and the fifth step to the seventh step are a third charging stage, and the charging voltage reached is the working voltage of the power unit, namely 400V.
Referring to fig. 3-4, fig. 3 is a graph showing the voltage variation during the first and second phases of the start-up, and fig. 4 is a graph showing the voltage variation during the second and third phases of the start-up. Wherein, 1 is the voltage waveform of the first charging phase, 2 is the voltage waveform of the second charging phase, and 3 is the voltage waveform of the third charging phase.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (1)
1. A high-voltage direct current-direct current power electronic transformer starting method based on a self-excitation mode is characterized in that the high-voltage direct current-direct current power electronic transformer is a double-active full-bridge DC-DC converter, and a DAB unit of the DC-DC converter is of a symmetrical structure formed by connecting two power units through a middle high-frequency isolation transformer; before starting, the two power units are divided into a power unit at a charged side and a power unit at a non-charged side;
the method for starting the high-voltage direct current-direct current power electronic transformer is characterized by comprising the following steps of:
step one, connecting a direct current end of a power unit on a charged side to a direct current end of a power unit on a non-charged side through a diode uncontrollable rectifier bridge;
step two, the power unit on the electrified side opens the internal phase shift angle slowly at the speed of 1 degree per 4-5ms, and the power unit on the electrified side charges the direct current end of the power unit on the non-electrified side slowly through the diode rectifier bridge until the voltage of the power unit on the non-electrified side reaches the working voltage of the control board: 180-200V; the charging control at this time is in an open loop mode;
locking an internal phase shift angle of a power unit on the electrified side to ensure overvoltage on the non-electrified side;
after the control board of the charged side power unit works normally, the charged side unit realizes voltage closed-loop control of the non-charged side unit through internal phase angle regulation, so that the voltage reaches 380V, and at the moment, the non-charged side unit IGBT keeps a locking state;
step five, disconnecting the uncontrollable rectifier bridge of the diode;
step six, the power unit on the charged side performs voltage closed-loop charging control on the power unit on the non-charged side through internal phase angle regulation, at the moment, the power unit on the non-charged side is unlocked, the internal phase angle is opened slowly to the maximum at the speed of 1 degree every 4-5ms, and the power units on the two sides are in a running state;
and step seven, when the internally-shifted phase angles of the electrified side power unit and the non-electrified side power unit are both opened to the maximum, switching to the externally-shifted phase angle control of the two power units to realize the voltage closed-loop charging of the power units until the running voltage of the non-electrified side power unit reaches 400V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811017162.0A CN109067165B (en) | 2018-08-31 | 2018-08-31 | High-voltage direct-current power electronic transformer starting method based on self-excitation mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811017162.0A CN109067165B (en) | 2018-08-31 | 2018-08-31 | High-voltage direct-current power electronic transformer starting method based on self-excitation mode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109067165A CN109067165A (en) | 2018-12-21 |
| CN109067165B true CN109067165B (en) | 2020-07-24 |
Family
ID=64759127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811017162.0A Active CN109067165B (en) | 2018-08-31 | 2018-08-31 | High-voltage direct-current power electronic transformer starting method based on self-excitation mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109067165B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109660117B (en) * | 2018-12-26 | 2021-06-08 | 国网江苏省电力有限公司电力科学研究院 | Power electronic transformer starting control method |
| CN110829819A (en) * | 2019-11-26 | 2020-02-21 | 国网江苏省电力有限公司南通供电分公司 | Power electronic transformer starting control method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578803A (en) * | 2015-02-04 | 2015-04-29 | 荣信电力电子股份有限公司 | High-voltage direct current-direct current power electronic transformer |
| CN105048857B (en) * | 2015-07-22 | 2017-10-20 | 西安交通大学 | The soft start and closed loop control method of a kind of pulse-generating circuit |
| CN107181413A (en) * | 2017-07-15 | 2017-09-19 | 华北电力大学（保定） | Mixed type direct current power electronic transformer |
-
2018
- 2018-08-31 CN CN201811017162.0A patent/CN109067165B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109067165A (en) | 2018-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | A Common Ground Switched-Quasi-$ Z $-Source Bidirectional DC–DC Converter With Wide-Voltage-Gain Range for EVs With Hybrid Energy Sources | |
| Xiao et al. | A ZVS bidirectional DC–DC converter with phase-shift plus PWM control scheme | |
| Zhao et al. | Switched Z-source isolated bidirectional DC–DC converter and its phase-shifting shoot-through bivariate coordinated control strategy | |
| US11424677B2 (en) | Systems and methods for isolated low voltage energy storage for data centers | |
| CN109560711B (en) | Isolated bidirectional DC-DC converter and modulation method thereof | |
| TWI397250B (en) | Two way full bridge zero-voltage and zero-current switching dc-dc converter | |
| Ngo et al. | A single-phase bidirectional dual active half-bridge converter | |
| CN104578253B (en) | High-frequency triangular transformation technology-based electric vehicle motor driving DC/DC transformation device | |
| US20220360184A1 (en) | Energy conversion device, power system and vehicle | |
| CN109067165B (en) | High-voltage direct-current power electronic transformer starting method based on self-excitation mode | |
| CN107888073B (en) | Alternating current-direct current hybrid energy router of all-round soft switch | |
| Liu et al. | Multiple input bidirectional dc/dc converter for energy supervision in fuel cell electric vehicles | |
| CN201312262Y (en) | High-frequency switch power supply with higher conversion efficiency | |
| JP2002272121A (en) | Input/output insulation type power-regenerating apparatus | |
| Zhang et al. | Soft-Switching Operation With a Variable Switching Frequency Control for Switched-Quasi-Z-Source Bidirectional DC–DC Converter in EVs | |
| CN112968603B (en) | Wide-transformation-ratio transformerless buck-boost converter | |
| CN206226052U (en) | A kind of mixed motor-car 42V/12V bilayer direct current convert charging devices | |
| CN113949282A (en) | Three-port vehicle-mounted charger | |
| CN107482922A (en) | A kind of two-way LLC resonant converter based on switching switch | |
| CN111106613B (en) | Uninterruptible power supply system with energy storage scheduling function and control method of DC-DC module | |
| Tang et al. | A bidirectional contactless power transfer system with dual-side power flow control | |
| CN104917195B (en) | A kind of Static Synchronous Series compensation device and its control method | |
| CN104734531B (en) | Frequency converter | |
| CN107370378B (en) | A kind of high-power high voltage DC-DC converter for trolleybus | |
| CN111525828A (en) | Control method of bidirectional isolation type resonant power converter based on virtual synchronous motor |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |