CN113556031B - Power electronic transformer and starting control method thereof - Google Patents
Power electronic transformer and starting control method thereof Download PDFInfo
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- CN113556031B CN113556031B CN202010331786.0A CN202010331786A CN113556031B CN 113556031 B CN113556031 B CN 113556031B CN 202010331786 A CN202010331786 A CN 202010331786A CN 113556031 B CN113556031 B CN 113556031B
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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
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- H02M1/36—Means for starting or stopping converters
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Abstract
The invention discloses a power electronic transformer and a starting control method thereof, wherein the power electronic transformer comprises a power grid side converter and an isolated direct current converter, the alternating current input end of the power grid side converter is connected with an alternating current side starting circuit, and the direct current output end is connected with the direct current input end of the isolated direct current converter; the direct current output end of the isolated direct current converter is connected with a direct current side starting circuit; the alternating current side starting circuit comprises an input end and an output end, wherein the input end is connected with an alternating current power grid, and the output end is connected with an alternating current input end of the power electronic transformer; the direct current side starting circuit comprises an input end and an output end, the input end is connected with a direct current output end of the power electronic transformer, and the output end is connected with a direct current power grid or a load. The invention sequentially controls the starting circuit of the power electronic transformer and the self equipment, reduces the cost and the occupied area of the complete equipment, solves the problem of flexible starting control of the power electronic transformer, and has engineering practical value.
Description
Technical Field
The invention belongs to the technical field of power electronic control, and particularly relates to a power electronic transformer and a starting control method thereof.
Background
The power electronic transformer is applied to the fields of new energy power generation, energy storage, locomotive traction and the like, and due to the adoption of a high-frequency power electronic technology, the weight and the volume of equipment are greatly reduced, and meanwhile, the functions of more flexible voltage conversion and energy bidirectional transmission can be realized. With the rapid development of the alternating current-direct current hybrid power distribution network, the power electronic transformer has wider and wider application prospect.
In an application scene, both an alternating current power grid and a direct current power grid have power supplies, so that the power electronic transformer has to have a flexible bidirectional starting function. In addition, because the direct current side of the converter in the power electronic transformer is not provided with an active power supply, the initial voltage of the direct current capacitor is 0, the direct current capacitor is equivalent to a short circuit during starting, a large impact is caused to a power grid, and the impact current during starting is reduced by adopting two charging modes of independent excitation and self excitation. The separately excited starting is to charge each direct current capacitor before starting by configuring an additional auxiliary circuit, but the design difficulty is high and the economy is poor after the insulation and voltage resistance is considered, so that the cost and the volume of the equipment are increased. The self-excitation starting is a mode that a current limiting device is additionally arranged on an alternating current side or a direct current side to limit charging impact current at the starting moment, and normal operation is unlocked after direct current voltage rises to a set value, but seamless connection between a charging process and the normal operation process needs to be considered, so that a bidirectional self-excitation starting mode is very necessary.
Disclosure of Invention
The invention aims to: the invention provides a power electronic transformer and a starting control method thereof, aiming at solving the problems of high cost, large volume, high design difficulty and the like in the prior art.
The technical scheme is as follows: the invention provides a power electronic transformer, which comprises a power grid side converter, an isolated direct current converter, a direct current side starting circuit and an alternating current side starting circuit; the input end of the alternating current side starting circuit is connected with an alternating current power grid or an alternating current load, and the output end of the alternating current side starting circuit is connected with the alternating current input end of the power grid side converter; the direct current output end of the power grid side converter is connected with the direct current input end of the isolated direct current converter; the direct current output end of the isolated direct current converter is connected with the input end of the direct current side starting circuit; the output end of the direct current side starting circuit is connected with a direct current power grid or a direct current load;
the input end and the output end of the direct current side starting circuit are connected in series and parallel through a switch and a current limiting resistor, and the current limiting resistor cannot be connected in series in a main loop of the direct current side starting circuit;
the input end and the output end of the alternating current side starting circuit are connected in series and parallel through a switch and a current limiting resistor, and the current limiting resistor cannot be connected in series in a main loop of the alternating current side starting circuit.
Further, the alternating current side starting circuit is a single-phase alternating current side starting circuit or a three-phase alternating current side starting circuit.
A starting control method of a power electronic transformer specifically comprises the following steps:
step 1: setting the starting direction of the power electronic transformer;
step 2: starting a corresponding starting circuit according to the set starting direction;
and step 3: if the set starting direction is AC side starting, judging whether the voltage of the DC output side of the power grid side converter reaches a set value Udc1set of AC side starting voltage, if so, judging that charging is finished and turning to step 4; if not, judging whether the charging time reaches a preset maximum charging time T1max, if so, determining that the charging fails, and stopping starting; otherwise, circularly executing the step 3; if the set starting direction is the direct current side starting, judging whether the voltage of the direct current input side of the isolation type direct current converter reaches a set value Udc2set of the direct current side starting voltage or not, if so, judging that the charging is finished and turning to the step 4; if not, judging whether the charging time reaches a preset maximum charging time T2max, if so, determining that the charging fails, and stopping starting; otherwise, circularly executing the step 3;
and 4, step 4: and unlocking the power electronic transformer, and setting control targets for the power grid side converter and the isolated direct current converter respectively.
Further, in step 4, if the set starting direction is ac-side starting, the power grid-side converter is unlocked first, and a control target of the converter is set to be a dc output-side voltage of the power grid-side converter; and when the voltage of the direct current output side of the power grid side converter reaches the Udc1set, unlocking the isolated direct current converter, and setting the control target of the converter as the voltage or power of the direct current output side of the isolated direct current converter.
Further, in the step 4, if the set starting direction is dc-side starting, the isolated dc converter is unlocked first, and a control target of the converter is set to be a dc input side voltage of the isolated dc converter; and when the voltage of the direct current input side of the isolation type direct current converter reaches the Udc2set, unlocking the power grid side converter, and setting the control target of the converter as the voltage or power of the alternating current input side of the power grid side converter.
Further, in the step 3, if the set starting mode is ac-side starting, the dc output side is passively charged through a body diode of a power device inside the grid-side converter; or the direct current output side of the power device is actively charged by controlling the duty ratio of the power device in the power grid side converter.
Further, in step 3, if the set starting mode is dc-side starting, the dc input side of the isolated dc converter is actively charged by controlling the duty ratio of the internal power device of the isolated dc converter.
Has the advantages that:
(1) the invention solves the problem of bidirectional starting control of the power electronic transformer, does not need to add additional high-voltage isolation power supply equipment, reduces the cost and the occupied area, and has engineering practical value;
(2) the invention can inhibit the charging impact current when the power electronic transformer is started, and effectively weaken the adverse effect on the power grid;
(3) the invention can realize the seamless switching between the starting and the normal operation of the power electronic transformer and effectively ensure the safety and the stability of the operation of equipment.
Drawings
FIG. 1 is a schematic diagram of a power electronic transformer when the AC side starting circuit is a single-phase AC side starting circuit;
fig. 2 is a schematic diagram of a single-phase ac-side start circuit, wherein (a) is a circuit diagram of a single-phase ac-side start circuit with a switch KM1 as a main loop; (b) the circuit diagram is a single-phase alternating-current side starting circuit diagram which takes a series circuit formed by switches KM1 and KM2 as a main loop;
fig. 3 is a schematic diagram of a dc-side start circuit, wherein (a) is a dc-side start circuit with switch KM1 as a main loop; (b) a direct current side starting circuit diagram which takes a series circuit formed by switches KM1 and KM2 as a main loop;
FIG. 4 is a schematic diagram of a power electronic transformer when the AC-side starting circuit is a three-phase AC-side starting circuit;
fig. 5 is a schematic diagram of a three-phase ac-side start circuit, and (a) is a dc-side start circuit with switch KM1 as a main circuit; (b) a direct current side starting circuit diagram which takes a series circuit formed by switches KM1 and KM2 as a main loop;
fig. 6 is a flow chart of the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
The present embodiment provides a start control method for a power electronic transformer, which implements bidirectional start by controlling the power electronic transformer and an ac side start circuit or a dc side start circuit thereof, where the power electronic transformer includes a power grid side converter and an isolated dc converter, an ac side of the power grid side converter is connected to the ac side start circuit, a dc side of the power grid side converter is connected to a dc input side of the isolated dc converter, and a dc output side of the isolated dc converter is connected to the dc side start circuit.
The alternating-current side starting circuit comprises a first input port ACP1 and a first output port ACP2, wherein the first input port ACP1 is connected with an alternating-current grid, and the first output port ACP2 is connected with the alternating-current side of the power electronic transformer.
The direct-current side starting circuit comprises a second input port DCP1 and a second output port DCP2, wherein the second input port DCP1 is connected with the direct-current side of the power electronic transformer, and the second output port DCP2 is connected with a direct-current power grid.
When the single-phase AC-side starting circuit is adopted, the structural schematic diagram of the power electronic transformer is shown in fig. 1, the interface form of the single-phase AC-side starting circuit is shown in fig. 2, and the first input port ACP1 and the first output port ACP2 are connected through the series-parallel combination of the switch KM1, the switch KM2 and the current limiting resistor R. However, it should be noted that the current-limiting resistor cannot be connected in series in the main loop of the single-phase ac-side start-up circuit; in fig. 2, (a) a current-limiting resistor and a switch KM2 are connected in series to form a series branch, and the series branch is connected in parallel with a switch KM1, and in fig. 2, (a) takes a switch KM1 as a main loop; in fig. 2, (b) shows that the switch KM2 and the current limiting resistor are connected in parallel and then connected in series with the switch KM1, and in fig. 2, (b) shows that a series circuit formed by the switches KM1 and KM2 is a main circuit.
As shown in fig. 3, the interface of the dc-side start circuit is connected between the second input port DCP1 and the second output port DCP2 through a series-parallel combination of a switch KM1, a switch KM2 and a resistor R; however, it should be noted that the current limiting resistor cannot be connected in series in the main loop of the single-phase ac-side start circuit; in fig. 3, (a) is a series branch formed by connecting a current-limiting resistor and a switch KM2 in series, the series branch is connected with a switch KM1 in parallel, and in fig. 3, (a) takes the switch KM1 as a main loop; in fig. 3, (b) shows that the switch KM2 and the current limiting resistor are connected in parallel and then connected in series with the switch KM1, and in fig. 3, (b) shows that a series circuit formed by the switches KM1 and KM2 is a main circuit.
When a three-phase ac-side start circuit is adopted, the schematic structure of the power electronic transformer is shown in fig. 4, the interface form of the three-phase ac-side start circuit is shown in fig. 5, and the first input port ACP1 and the first output port ACP2 are connected through a series-parallel combination of the first switch KM1, the second switch KM2 and the resistor R. However, it should be noted that the current-limiting resistor cannot be connected in series in the main loop of the single-phase ac-side start-up circuit; in fig. 5, (a) a current-limiting resistor and a switch KM2 are connected in series to form a series branch, and the series branch is connected in parallel with a switch KM1, and in fig. 5, (a) the switch KM1 is used as a main loop; in fig. 5, (b) shows that the switch KM2 and the current limiting resistor are connected in parallel and then connected in series with the switch KM1, and in fig. 5, (b) shows that a series circuit formed by the switches KM1 and KM2 is a main circuit.
As shown in fig. 6, the start control method of the power electronic transformer, when the start direction is ac side start, includes the following steps:
(1) setting the starting direction of the power electronic transformer as the AC side starting, starting the AC side charging circuit,
(2) for a power grid side converter of a power electronic transformer, passively charging the direct current side of the power grid side converter through a body diode of an internal power device; or the direct current side of the power device in the grid-side converter is actively charged by controlling the duty ratio of the power device.
(3) After the charging time set value T1, judging whether the direct current output side voltage Udc1 of the power grid side converter reaches a voltage set value Udc1set, if the voltage set value Udc1set is reached, judging that the charging is finished, and entering the step (4), if the voltage set value Udc1set is not reached, further judging whether the charging time reaches a maximum charging time set value T1max, if the charging time does not reach the maximum charging time set value T1max, repeating the step (2), and if the maximum charging time set value T1max is reached, failing to charge and exiting the starting;
(4) the method comprises the steps of unlocking a power grid side converter of the power electronic transformer, setting a control target to be the voltage of the direct current output side of the power grid side converter, unlocking an isolation type direct current converter of the power electronic transformer S1, and setting the control target to be the voltage or power of the direct current output side of the isolation type direct current converter.
When the starting direction is the direct current side starting, the method comprises the following steps:
(1) setting the starting direction of the power electronic transformer as the DC side starting, starting the DC side charging circuit,
(2) charging an isolated DC converter of a power electronic transformer; the direct current input side of the isolated type direct current converter is charged by controlling the duty ratio of a power device in the isolated type direct current converter.
(3) After the charging time set value T2, judging whether the direct current input voltage Udc2 of the isolated direct current converter reaches a voltage set value Udc2set, if the voltage set value Udc2set is reached, judging that the charging is finished, and entering the step (4), if the voltage set value Udc2set is not reached, further judging whether the charging time reaches a maximum charging time set value T2max, if the charging time does not reach the maximum charging time set value T2max, repeating the step (2), and if the maximum charging time set value T2max is reached, failing to charge and exiting the starting;
(4) the method comprises the steps of unlocking an isolated direct current converter of the power electronic transformer, setting a control target as a direct current input side of a power grid side converter, unlocking the power grid side converter of the power electronic transformer, and setting a control target as alternating current side power of the power grid side converter.
The starting direction and the control target in the invention can be modified before the power electronic transformer is started, and the control unit of the power electronic transformer can be sent by the upper computer in a communication mode. When the operation test is carried out, the upper computer can be connected with the power electronic transformer and carries out communication.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (6)
1. A starting control method of a power electronic transformer comprises a power grid side converter, an isolated direct current converter, a direct current side starting circuit and an alternating current side starting circuit; the input end of the alternating current side starting circuit is connected with an alternating current power grid or an alternating current load, and the output end of the alternating current side starting circuit is connected with the alternating current input end of the power grid side converter; the direct current output end of the power grid side converter is connected with the direct current input end of the isolated direct current converter; the direct current output end of the isolated direct current converter is connected with the input end of the direct current side starting circuit; the output end of the direct current side starting circuit is connected with a direct current power grid or a direct current load;
the input end and the output end of the direct current side starting circuit are connected in series and parallel through a switch and a current limiting resistor, and the current limiting resistor cannot be connected in series in a main loop of the direct current side starting circuit;
the input end and the output end of the AC side starting circuit are connected with each other through a circuit formed by connecting a switch and a current-limiting resistor in series and parallel, and the current-limiting resistor cannot be connected in series in a main loop of the AC side starting circuit; the method is characterized by comprising the following steps:
step 1: setting the starting direction of the power electronic transformer;
step 2: starting a corresponding starting circuit according to a set starting direction;
and step 3: if the set starting direction is AC side starting, judging whether the voltage of the DC output end of the power grid side converter reaches a set value Udc1set of AC side starting voltage, if so, judging that charging is finished and turning to step 4; if not, judging whether the charging time reaches a preset maximum charging time T1max, if so, determining that the charging fails, and stopping starting; otherwise, circularly executing the step 3; if the set starting direction is the direct current side starting, judging whether the voltage of a direct current input end of the isolated direct current converter reaches a set value Udc2set of direct current side starting voltage or not, if so, judging that the charging is finished and turning to the step 4; if not, judging whether the charging time reaches a preset maximum charging time T2max, if so, determining that the charging fails, and stopping starting; otherwise, circularly executing the step 3;
and 4, step 4: and unlocking the power electronic transformer, and setting control targets for the power grid side converter and the isolated direct current converter respectively.
2. A method as claimed in claim 1, wherein said ac-side starting circuit is a single-phase ac-side starting circuit or a three-phase ac-side starting circuit.
3. A method as claimed in claim 1, wherein in step 4, if the set starting direction is ac side starting, the grid side converter is unlocked first, and the control target of the converter is set as the dc output terminal voltage of the grid side converter; and when the voltage of the direct current output end of the power grid side converter reaches Udc1set, unlocking the isolated direct current converter, and setting the control target of the converter as the voltage or power of the direct current output end of the isolated direct current converter.
4. The method as claimed in claim 1, wherein in step 4, if the set starting direction is dc-side starting, the isolated dc converter is unlocked first, and the control target of the converter is set as the dc input terminal voltage of the isolated dc converter; and when the voltage of the direct current input end of the isolation type direct current converter reaches the Udc2set, unlocking the power grid side converter, and setting the control target of the converter as the voltage or the power of the alternating current input end of the power grid side converter.
5. A method for controlling the start-up of a power electronic transformer according to claim 1, wherein in step 3, if the set start-up mode is ac-side start-up, the dc output terminal of the grid-side converter is passively charged through a body diode of a power device inside the grid-side converter; or the direct current output end of the power grid side converter is actively charged by controlling the duty ratio of a power device in the power grid side converter.
6. The method according to claim 1, wherein in step 3, if the set starting mode is dc-side starting, the dc input terminal of the isolated dc converter is actively charged by controlling a duty ratio of a power device inside the isolated dc converter.
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| CN113640693A (en) * | 2020-04-24 | 2021-11-12 | 国网江苏省电力有限公司电力科学研究院 | Power electronic transformer operation system and control method |
| CN116979589B (en) * | 2023-09-20 | 2024-01-26 | 广东电网有限责任公司珠海供电局 | Starting method and related device for CHB (common bus) branch of flexible interconnection device |
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| CN104426346A (en) * | 2013-09-09 | 2015-03-18 | 南京南瑞继保电气有限公司 | Self-excitation soft start method for chain-type converter valve |
| CN108880264A (en) * | 2018-06-28 | 2018-11-23 | 合肥工业大学 | The double active bridge DC converter control methods for having soft start function |
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| 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 |
| CN110943469A (en) * | 2019-12-18 | 2020-03-31 | 国网智能科技股份有限公司 | Single-stage energy storage converter and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3026803A1 (en) * | 2014-11-25 | 2016-06-01 | Alstom Technology Ltd | Start-up of HVDC converters |
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| CN104426346A (en) * | 2013-09-09 | 2015-03-18 | 南京南瑞继保电气有限公司 | Self-excitation soft start method for chain-type converter valve |
| CN108880264A (en) * | 2018-06-28 | 2018-11-23 | 合肥工业大学 | The double active bridge DC converter control methods for having soft start function |
| CN109412187A (en) * | 2018-09-26 | 2019-03-01 | 国家电网有限公司 | A kind of flexible island direct current transmission system island converter station starting charging unit and method |
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| CN110943469A (en) * | 2019-12-18 | 2020-03-31 | 国网智能科技股份有限公司 | Single-stage energy storage converter and control method thereof |
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