CN203826977U - Power electronic transformer - Google Patents
Power electronic transformer Download PDFInfo
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- CN203826977U CN203826977U CN201420166757.3U CN201420166757U CN203826977U CN 203826977 U CN203826977 U CN 203826977U CN 201420166757 U CN201420166757 U CN 201420166757U CN 203826977 U CN203826977 U CN 203826977U
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- 239000003990 capacitor Substances 0.000 claims abstract description 93
- 238000004146 energy storage Methods 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 230000002457 bidirectional effect Effects 0.000 claims description 16
- 238000002955 isolation Methods 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 9
- 238000009415 formwork Methods 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
- 230000006870 function Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
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Abstract
本实用新型提供了一种电力电子变压器，该变压器包括：电容电压检测模块，检测各级H桥整流器的直流电容、预充电控制后各级H桥整流器的直流电容电压、负载的直流母线电容和超级电容的电压实际值；超级电容储能模块，根据各级H桥整流器的直流电容电压实际值，通过超级电容储能控制进行预充电控制；直流电容电压判断模块，判断各级H桥整流器的直流电容电压实际值是否达到正常工作电压值，若达到，则并入电网；若不达到，则重新进行预充电控制。本实用新型的电力电子变压器的储能模块，在并网前对直流母线电容进行预充电控制，从而降低了电力电子变压器并网时开关上的冲击电流，在并网后对超级电容进行充放电控制，维持直流母线电压稳定。
The utility model provides a power electronic transformer, which includes: a capacitance voltage detection module, which detects the DC capacitance of the H-bridge rectifiers at each level, the DC capacitance voltage of the H-bridge rectifiers at each level after pre-charging control, the DC bus capacitance of the load and The actual voltage value of the supercapacitor; the supercapacitor energy storage module, according to the actual value of the DC capacitor voltage of the H-bridge rectifiers at all levels, performs pre-charging control through the supercapacitor energy storage control; the DC capacitor voltage judgment module judges the voltage of the H-bridge rectifiers at all levels Whether the actual value of the DC capacitor voltage reaches the normal working voltage value, if it does, it will be connected to the power grid; if it does not, the pre-charging control will be carried out again. The energy storage module of the power electronic transformer of the utility model performs pre-charging control on the DC bus capacitor before the grid connection, thereby reducing the impact current on the switch when the power electronic transformer is connected to the grid, and charges and discharges the super capacitor after the grid connection control to maintain the stability of the DC bus voltage.
Description
Technical field
The utility model relates to power electronics control field, particularly a kind of electric power electric transformer.
Background technology
Along with the development of high-power electric and electronic components and parts and control technology thereof, a kind of realize by power electronic technology that power converter and energy transmit novel transformer---electric power electric transformer (Power Electronic Transformer, PET) has obtained domestic and international researcher and has more and more paid close attention to.At power electronics control field, researcher has proposed a kind of new distributed energy organizational form and structure---microgrid.Wherein, electric power electric transformer provides interface for various renewable distributed power sources, energy storage device and load access electrical network.
In existing microgrid, direct current microgrid adopts multi-agent system (Multi Agent System, MAS) to control DC bus-bar voltage more, is multiple little subsystems by each distributed power source, energy storage device and load partition.Not only relatively independent but also connect each other between different sub-systems, only have each other the interchange of information, carry out work by the mode of cooperative cooperating.Administrative center sends instruction and carries out unified management, realizes DC bus-bar voltage stable by each subsystem voltage balance control.
But the multi-agent system (Multi Agent System, MAS) of direct current microgrid is once control system administrative center is out of control or communication instruction fault can cause even system crash of voltage imbalance; And control algolithm is quite complicated, has increased difficulty.Electric power electric transformer is as the tie between distributed power source and electrical network, play the relation in buffering coordinating net source, how to realize PET quick adjustment low-voltage direct busbar voltage, improve low-voltage direct-current system stable operation ability, and the level and smooth grid-connected problem that electric power electric transformer must be considered of developing that becomes of implement device itself.
Utility model content
(1) technical problem that will solve
A kind of electric power electric transformer that the utility model provides, by super capacitor energy-storage module, grid-connected front dc-link capacitance is carried out to precharge and maintain DC bus-bar voltage stable, reduce electric power electric transformer impulse current on switching device when grid-connected, and in the power frequent fluctuation situation of direct current microgrid the voltage on stable DC bus.
(2) technical scheme
The utility model provides a kind of electric power electric transformer, it is characterized in that, comprises with lower module:
Capacitance voltage detection module, for detection of DC capacitor voltage, the dc-link capacitance of power distribution network load and the voltage actual value of super capacitor of H bridge rectifiers at different levels after the DC capacitor of H bridge rectifiers at different levels, precharge control;
Super capacitor energy-storage module, for according to the DC capacitor voltage actual value of described H bridge rectifiers at different levels, carries out precharge control by super capacitor energy-storage control;
Whether DC capacitor voltage judge module, reach normal working voltage value for the DC capacitor voltage actual value that judges H bridge rectifiers at different levels, if reach, is connected to the grid; If do not reach, re-start precharge control.
Further, described electric power electric transformer, also comprises:
H bridge cascade rectifier, isolation type bidirectional full-bridge DC/DC converter, inverter, low-voltage bus bar interface, the DC terminal of every one-level of described H bridge cascade rectifier is connected with a described isolation type bidirectional full-bridge DC/DC converter; The low-pressure end of described isolation type bidirectional full-bridge DC/DC converter is connected with described super capacitor energy-storage module; Described inverter DC terminal is connected with described isolation type bidirectional full-bridge DC/DC converter; The DC terminal of described inverter is connected with super capacitor energy-storage module.
Further, described super capacitor energy-storage module comprises:
Dc-link capacitance voltage processing module, poor for the command value of the dc-link capacitance voltage of power distribution network load and described voltage actual value are done, described difference is carried out to PI control, and calculate the dc-link capacitance voltage of expectation;
The instruction current processing module of super capacitor, be used for according to the duty ratio of DC bus current command value and two-way DC/DC current transformer, limit super capacitor current instruction value between can the maximum and minimum value of discharging current by super capacitor current limit module, calculate the current instruction value of super capacitor;
Super capacitor sliding formwork control module, poor for the current instruction value of described super capacitor and actual value are done, described difference is carried out to sliding formwork control, and the difference after described sliding formwork control is inputed to two-way DC/DC current transformer controlling unit;
Two-way DC/DC current transformer control module, for discharging and recharging by two-way DC/DC current transformer control super capacitor.
Further, described super capacitor memory module also comprises:
Super capacitor group, for discharging and storage of electrical energy;
Super capacitor equivalent series resistance, for analyzing electric current and voltage transient process;
Super capacitor boost inductance, for promoting load voltage;
Two-way DC/DC current transformer, is used for realizing BUCK and the BOOST function of circuit.
Further, described two-way DC/DC current transformer comprises:
BUCK switch, is made up of metal-oxide-semiconductor and diode, for controlling the charging of super capacitor;
BOOST switch, is made up of metal-oxide-semiconductor and diode, for controlling the electric discharge of super capacitor.
(3) beneficial effect
A kind of electric power electric transformer control that the utility model provides, judge whether the DC capacitor voltage of H bridge rectifiers at different levels reaches normal working voltage being connected to the grid to advance, if do not reach, re-start precharge control, just be connected to the grid until reach operating voltage working properly, reduce the impulse current on switching device when electric power electric transformer is grid-connected, effectively reduced grid-connected current and impact, ensured the safe, stable of switching device.
Brief description of the drawings
Fig. 1 is the control system structural representation of a kind of electric power electric transformer of providing of the utility model embodiment 1;
Fig. 2 is the control system structural representation of the another kind of electric power electric transformer that provides of the utility model embodiment 2;
Fig. 3 is the cascade electric power electric transformer overall structure figure that the utility model embodiment 1 and 2 provides;
Fig. 4 is that the super capacitor energy-storage module that the utility model embodiment 2 provides is opened up complement.
Embodiment
For making the utility model embodiment object, technical scheme and advantage clearer; below in conjunction with the accompanying drawing in the utility model embodiment; technical scheme in the utility model embodiment is clearly and completely described; obviously; described embodiment is the utility model part embodiment; instead of whole embodiment; based on the embodiment in the utility model; the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belongs to the scope that the utility model is protected.
Embodiment 1:
The utility model embodiment provides a kind of electric power electric transformer, referring to Fig. 1, comprises with lower module:
Capacitance voltage detection module 101, for detection of DC capacitor voltage, the dc-link capacitance of power distribution network load and the voltage actual value of super capacitor of H bridge rectifiers at different levels after the DC capacitor of H bridge rectifiers at different levels, precharge control;
Super capacitor energy-storage module 102, for according to the DC capacitor voltage actual value of described H bridge rectifiers at different levels, carries out precharge control by super capacitor energy-storage control;
Whether DC capacitor voltage judge module 103, reach normal working voltage value for the DC capacitor voltage actual value that judges H bridge rectifiers at different levels, if reach, is connected to the grid; If do not reach, re-start precharge control.
Alternatively, referring to Fig. 3, described electric power electric transformer, also comprises:
H bridge cascade rectifier, isolation type bidirectional full-bridge DC/DC converter, inverter, low-voltage bus bar interface, the DC terminal of every one-level of described H bridge cascade rectifier is connected with a described isolation type bidirectional full-bridge DC/DC converter; The low-pressure end of described isolation type bidirectional full-bridge DC/DC converter is connected with described super capacitor energy-storage module; Described inverter DC terminal is connected with described isolation type bidirectional full-bridge DC/DC converter; The DC terminal of described inverter is connected with super capacitor energy-storage module.
Embodiment 2:
The utility model embodiment provides a kind of electric power electric transformer, referring to Fig. 2, comprises with lower module:
Capacitance voltage detection module 201, for detection of DC capacitor voltage, the dc-link capacitance of power distribution network load and the voltage actual value of super capacitor of H bridge rectifiers at different levels after the DC capacitor of H bridge rectifiers at different levels, precharge control;
Super capacitor energy-storage module 203, for according to the DC capacitor voltage actual value of described H bridge rectifiers at different levels, carries out precharge control by super capacitor energy-storage control;
Whether DC capacitor voltage judge module 202, reach normal working voltage value for the DC capacitor voltage actual value that judges H bridge rectifiers at different levels, if reach, is connected to the grid; If do not reach, re-start precharge control.
Alternatively, referring to Fig. 3, described electric power electric transformer, also comprises:
H bridge cascade rectifier, isolation type bidirectional full-bridge DC/DC converter, inverter, low-voltage bus bar interface, the DC terminal of every one-level of described H bridge cascade rectifier is connected with a described isolation type bidirectional full-bridge DC/DC converter; The low-pressure end of described isolation type bidirectional full-bridge DC/DC converter is connected with described super capacitor energy-storage module; Described inverter DC terminal is connected with described isolation type bidirectional full-bridge DC/DC converter; The DC terminal of described inverter is connected with super capacitor energy-storage module.
Alternatively, referring to Fig. 2, described super capacitor energy-storage module comprises:
Dc-link capacitance voltage processing module 204, poor for the command value of the dc-link capacitance voltage of power distribution network load and described voltage actual value are done, described difference is carried out to PI control, and calculate the dc-link capacitance voltage of expectation;
The instruction current processing module 205 of super capacitor, be used for according to the duty ratio of DC bus current command value and two-way DC/DC current transformer, limit super capacitor current instruction value between can the maximum and minimum value of discharging current by super capacitor current limit module, calculate the current instruction value of super capacitor;
Super capacitor sliding formwork control module 206, poor for the current instruction value of described super capacitor and actual value are done, described difference is carried out to sliding formwork control, and the difference after described sliding formwork control is inputed to two-way DC/DC current transformer controlling unit.
Two-way DC/DC current transformer control module 207, for discharging and recharging by two-way DC/DC current transformer control super capacitor.
Alternatively, referring to Fig. 4, described super capacitor memory module also comprises:
Super capacitor group, for discharging and storage of electrical energy;
Super capacitor equivalent series resistance, for analyzing electric current and voltage transient process;
Super capacitor boost inductance, for promoting load voltage;
Two-way DC/DC current transformer, is used for realizing BUCK and the BOOST circuit of circuit
Alternatively, described two-way DC/DC current transformer comprises:
BUCK switch, is made up of metal-oxide-semiconductor and diode, for controlling the charging of super capacitor;
BOOST switch, is made up of metal-oxide-semiconductor and diode, for controlling the electric discharge of super capacitor.
Visible by foregoing description, the utility model embodiment has following beneficial effect:
A kind of electric power electric transformer that the utility model provides, judge whether the DC capacitor voltage of H bridge rectifiers at different levels reaches normal working voltage being connected to the grid to advance, if do not reach, re-start precharge control, just be connected to the grid until reach operating voltage working properly, reduced the impulse current on switching device when electric power electric transformer is grid-connected.Effectively reduce grid-connected current and impact, ensure the safe, stable of switching device; By the energy storage control of super capacitor energy-storage module, to between super capacitor and the electric energy of dc-link capacitance, transmit, thereby under the frequent change conditions of power of direct current microgrid, stable DC busbar voltage, improve the quality of power supply, guarantee the stable operation of direct-flow electricity utilization apparatus.
It should be noted that: the foregoing is only preferred embodiment of the present utility model, only, for the technical solution of the utility model is described, be not intended to limit protection range of the present utility model.All any amendments all within principle of the present utility model, equal replacement, improvement etc., be all included in protection range of the present utility model.
Claims (5)
1. an electric power electric transformer, is characterized in that, comprises with lower module:
Capacitance voltage detection module, for detection of DC capacitor voltage, the dc-link capacitance of power distribution network load and the voltage actual value of super capacitor of H bridge rectifiers at different levels after the DC capacitor of H bridge rectifiers at different levels, precharge control;
Super capacitor energy-storage module, for according to the DC capacitor voltage actual value of described H bridge rectifiers at different levels, carries out precharge control by super capacitor energy-storage control;
Whether DC capacitor voltage judge module, reach normal working voltage value for the DC capacitor voltage actual value that judges H bridge rectifiers at different levels, if reach, is connected to the grid; If do not reach, re-start precharge control.
2. electric power electric transformer according to claim 1, is characterized in that, also comprises:
H bridge cascade rectifier, isolation type bidirectional full-bridge DC/DC converter, inverter, low-voltage bus bar interface, the DC terminal of every one-level of described H bridge cascade rectifier is connected with a described isolation type bidirectional full-bridge DC/DC converter; The low-pressure end of described isolation type bidirectional full-bridge DC/DC converter is connected with described super capacitor energy-storage module; Described inverter DC terminal is connected with described isolation type bidirectional full-bridge DC/DC converter; The DC terminal of described inverter is connected with super capacitor energy-storage module.
3. electric power electric transformer according to claim 1, is characterized in that, described super capacitor energy-storage module comprises:
Dc-link capacitance voltage processing module, poor for the command value of the dc-link capacitance voltage of power distribution network load and described voltage actual value are done, described difference is carried out to PI control, and calculate the dc-link capacitance voltage of expectation;
The instruction current processing module of super capacitor, be used for according to the duty ratio of DC bus current command value and two-way DC/DC current transformer, limit super capacitor current instruction value between can the maximum and minimum value of discharging current by super capacitor current limit module, calculate the current instruction value of super capacitor;
Super capacitor sliding formwork control module, poor for the current instruction value of described super capacitor and actual value are done, described difference is carried out to sliding formwork control, and the difference after described sliding formwork control is inputed to two-way DC/DC current transformer controlling unit;
Two-way DC/DC current transformer control module, for discharging and recharging by two-way DC/DC current transformer control super capacitor.
4. electric power electric transformer according to claim 1, is characterized in that, described super capacitor memory module also comprises:
Super capacitor group, for discharging and storage of electrical energy;
Super capacitor equivalent series resistance, for analyzing electric current and voltage transient process;
Super capacitor boost inductance, for promoting load voltage;
Two-way DC/DC current transformer, is used for realizing BUCK and the BOOST function of circuit.
5. electric power electric transformer according to claim 4, is characterized in that, described two-way DC/DC current transformer comprises:
BUCK switch, is made up of metal-oxide-semiconductor and diode, for controlling the charging of super capacitor;
BOOST switch, is made up of metal-oxide-semiconductor and diode, for controlling the electric discharge of super capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420166757.3U CN203826977U (en) | 2014-04-08 | 2014-04-08 | Power electronic transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420166757.3U CN203826977U (en) | 2014-04-08 | 2014-04-08 | Power electronic transformer |
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| Publication Number | Publication Date |
|---|---|
| CN203826977U true CN203826977U (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420166757.3U Expired - Lifetime CN203826977U (en) | 2014-04-08 | 2014-04-08 | Power electronic transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986173A (en) * | 2014-04-08 | 2014-08-13 | 广西电网公司电力科学研究院 | A control method and system for a power electronic transformer |
| CN106026686A (en) * | 2016-05-25 | 2016-10-12 | 中国电力科学研究院 | Power electronic transformer integrated with energy storage system |
| CN106787787A (en) * | 2015-11-24 | 2017-05-31 | 中车大连电力牵引研发中心有限公司 | Electric power electric transformer and rail vehicle power system with control unit |
| WO2017101837A1 (en) * | 2015-12-18 | 2017-06-22 | Byd Company Limited | Electric vehicle and vehicle-mounted charger and method for controlling the same |
-
2014
- 2014-04-08 CN CN201420166757.3U patent/CN203826977U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986173A (en) * | 2014-04-08 | 2014-08-13 | 广西电网公司电力科学研究院 | A control method and system for a power electronic transformer |
| CN103986173B (en) * | 2014-04-08 | 2016-06-29 | 广西电网公司电力科学研究院 | The control method of a kind of electric power electric transformer and system |
| CN106787787A (en) * | 2015-11-24 | 2017-05-31 | 中车大连电力牵引研发中心有限公司 | Electric power electric transformer and rail vehicle power system with control unit |
| WO2017101837A1 (en) * | 2015-12-18 | 2017-06-22 | Byd Company Limited | Electric vehicle and vehicle-mounted charger and method for controlling the same |
| US10675978B2 (en) | 2015-12-18 | 2020-06-09 | Byd Company Limited | Electric vehicle, vehicle-mounted charger, and method for controlling the same |
| CN106026686A (en) * | 2016-05-25 | 2016-10-12 | 中国电力科学研究院 | Power electronic transformer integrated with energy storage system |
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Granted publication date: 20140910 |
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| CX01 | Expiry of patent term |