CN113640693A - Power electronic transformer operation system and control method - Google Patents
Power electronic transformer operation system and control method Download PDFInfo
- Publication number
- CN113640693A CN113640693A CN202010331375.1A CN202010331375A CN113640693A CN 113640693 A CN113640693 A CN 113640693A CN 202010331375 A CN202010331375 A CN 202010331375A CN 113640693 A CN113640693 A CN 113640693A
- Authority
- CN
- China
- Prior art keywords
- direct current
- power
- converter
- interface circuit
- power electronic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 42
- 238000002955 isolation Methods 0.000 claims abstract 5
- 238000004804 winding Methods 0.000 claims description 26
- 230000008859 change Effects 0.000 claims description 17
- 230000004044 response Effects 0.000 claims description 11
- 238000013112 stability test Methods 0.000 claims description 9
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 16
- 238000004088 simulation Methods 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses an operation system and a control method of a power electronic transformer, which comprises a first power electronic transformer, a second power electronic transformer, an alternating current side interface circuit and a direct current side interface circuit, wherein one power electronic transformer is used as a measured object, and the other power electronic transformer is used as an analog load; the first power electronic transformer and the second power electronic transformer both comprise a power grid side converter and an isolated direct current converter; the alternating current sides of the two power grid side converters are respectively connected with an alternating current side interface circuit, and the direct current sides of the power grid side converters are connected with the direct current input sides of the corresponding isolation type direct current converters; the direct current output sides of the two isolated direct current converters are respectively connected with a direct current side interface circuit. The invention simulates the load of the power electronic transformer by using the power electronic transformer, can simplify the flow of the power electronic transformer to be tested during the operation test, improves the test efficiency, and reduces the investment of a test platform and the energy consumption in the test process.
Description
Technical Field
The invention belongs to the technical field of power electronic application operation tests, and particularly relates to a power electronic transformer operation system and a control method.
Background
Compared with the traditional power frequency transformer, the power electronic transformer has the advantages that the weight and the size of the transformer are greatly reduced due to the adoption of a high-frequency power electronic technology, and meanwhile, more flexible voltage conversion and energy transmission functions can be realized.
When the traditional test system and method are adopted to carry out full-power test on the power electronic transformer, a large-capacity power supply is required to provide power, a large-capacity direct-current load is also required to be configured, so that the running system is high in cost and the electric energy is seriously wasted, meanwhile, the running test of the power electronic transformer needs to meet several test purposes simultaneously, including direct-current voltage output precision, load carrying capacity, dynamic response characteristics and the like, and in addition, the existing running test system and control method have the defects of complex system architecture and low test efficiency when the purposes are achieved, so that the test system and method are necessarily improved.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a power electronic transformer operation system and a control method, aiming at solving the problems of low efficiency, complex structure, high cost and the like in the prior art.
The technical scheme is as follows: the invention provides a power electronic transformer operation system, which comprises: the power supply comprises a first power electronic transformer, a second power electronic transformer, an alternating current side interface circuit and a direct current side interface circuit; the first power electronic transformer comprises: the system comprises a first grid side converter and a first isolated direct current converter; the second power electronic transformer comprises: a second grid-side converter and a second isolated DC converter; the alternating current side interface circuit comprises two output ports and an input port, and the direct current side interface circuit comprises a first output port and a second output port;
the input port of the alternating current side interface circuit is connected with a power grid, one of the two output ports is connected with the alternating current input end of the first power grid side converter, and the other output port is connected with the alternating current input end of the second power grid side converter; the direct current output ends of the first and second power grid side converters are respectively connected with the direct current input ends of the first and second isolated direct current converters; the direct current output ends of the first and second isolated direct current converters are respectively connected with the first and second output ports of the direct current side interface circuit.
Furthermore, two output ports of the alternating current side interface circuit are connected through a lead or two serially connected reactors or three-phase winding transformers; when the two output ports are connected through a wire or two serially connected reactors or a three-phase winding transformer, the midpoint of the wire or the mutual connection position of the two reactors or the input end of the three-phase winding transformer is used as the input port of the AC side interface circuit; or one of the two output ports of the alternating current side interface circuit is connected with the output end of one double-winding transformer, the other output port is connected with the output end of the other double-winding transformer, and the input ends of the two double-winding transformers are connected in parallel and then serve as the input end of the alternating current side interface circuit.
Further, the ac side interface circuit is a single-phase ac side interface circuit or a three-phase ac side interface circuit.
Furthermore, two output ports of the dc side interface circuit are connected in series-parallel with a current limiting resistor through a wire or a switch to form a circuit connection, and when the two output ports are connected in series-parallel with the current limiting resistor through the switch, the current limiting resistor cannot be connected in series in a main loop of the dc side interface circuit.
A control method for an operation system of a power electronic transformer specifically comprises the following steps:
step 1: one of the first power electronic transformer and the second power electronic transformer is used as a tested object, and the other one is used as an analog load; starting a tested object, so that the tested object is connected to an alternating current power grid through an alternating current side interface circuit, the voltage of a direct current output side of a power grid side converter of the tested object reaches a first set value, and the voltage of the direct current output side of an isolated direct current converter reaches a second set value;
starting the analog load, so that the analog load is connected to an alternating current power grid through an alternating current side interface circuit, the voltage of a direct current output side of a power grid side converter of the analog load reaches a third set value, and the voltage of the direct current output side of the isolated direct current converter tracks the voltage of the direct current output side of the isolated direct current converter of the tested object;
and step 3: connecting the direct current output side of the isolated converter of the tested object and the direct current output side of the isolated converter of the analog load in parallel through a direct current side interface circuit, and then controlling the direct current output side current of the isolated converter of the analog load to be 0;
and 4, step 4: setting a power instruction value of the analog load, wherein the power instruction value does not exceed the capacity of the tested object, and enabling the power of the direct current output side of the isolated direct current converter of the analog load to track the set power instruction value;
and 5: and carrying out operation tests on the tested object, wherein the operation tests comprise a direct current stability test, a thermal stability test, a maximum operation capability test and a dynamic response characteristic test.
Further, the dc stability test specifically includes: executing step 4, adjusting the power instruction value of the analog load, so that the tested object is in a working state under different powers by controlling the power of the direct current output side of the isolated direct current converter of the analog load, detecting the direct current output side voltage of the isolated direct current converter of the tested object under different powers, calculating the amplitude difference between the direct current output side voltage of the isolated direct current converter of the tested object and a second set value under different power instruction values, and if the amplitude difference is greater than or equal to 5% of the second set value, determining that the tested object does not meet the stability requirement;
the thermal stability test specifically comprises the following steps: step 4 is executed, the power instruction value of the analog load is adjusted, so that the power of the direct current output side of the isolated direct current converter of the analog load is controlled, the object to be tested is in rated power operation within the set time, and after the set time is over, whether the object to be tested meets the requirement of thermal stability is judged according to the temperature and the damage condition of each component of the object to be tested;
the maximum operation capability test specifically comprises the following steps: step 4 is executed, the power instruction value of the analog load is adjusted, so that the power of the direct current output side of the isolated direct current converter of the analog load is controlled, the tested object works with the maximum power within the set time, and after the set time is finished, whether the tested object meets the requirement of the maximum operation capacity is judged according to the temperature and the damage condition of each component of the tested object;
the dynamic response characteristic test specifically comprises the following steps: and 4, adjusting the power instruction value of the analog load, simulating the power sudden change of the tested object by controlling and adjusting the power of the direct current output side of the isolated direct current converter of the analog load, and judging whether the tested object meets the requirement of the dynamic response characteristic or not by the change amplitude of the voltage of the direct current side of the isolated direct current converter of the tested object when the power suddenly changes and the time for recovering to the set value.
Has the advantages that:
(1) the invention utilizes two power electronic transformers, one control is the power electronic transformer, the other control is the analog load, and different control methods realize the functions of the whole operation system through different function distribution, and the equipment utilization rate is high;
(2) the two power electronic transformers are completely the same in hardware structure, and the purpose of mutual testing can be achieved after the control instructions of the two power electronic transformers are replaced, so that the testing efficiency is improved;
(3) the invention can realize the simulation of various load working conditions, the sudden change of the load and the like by adjusting the control target of the simulated load, and has complete test functions;
(4) the invention reduces the requirement on the capacity of the power supply through the energy feedback of the two power electronic transformers, and does not need to be provided with a large-capacity direct current load, thereby reducing the investment of an operation test system and the energy consumption in the operation test process to the maximum extent.
Drawings
FIG. 1 is a schematic view of the overall structure of an embodiment 1 of the operation system of the present invention;
fig. 2 is a schematic diagram of a three-phase ac side interface circuit, (a) is a schematic diagram of a connection between two output ports of the three-phase ac side interface circuit through a wire; (b) the three-phase alternating-current side interface circuit is a schematic diagram that two output ports of the three-phase alternating-current side interface circuit are connected through two reactors; (c) the schematic diagram is that two output ports of a three-phase alternating-current side interface circuit are connected through a three-phase winding; (d) the schematic diagram is that two output ports of a three-phase alternating-current side interface circuit are connected with two bidirectional phase windings;
fig. 3 is a schematic diagram of a dc side interface circuit, (a) is a schematic diagram of a direct wire connection between two output ports; (b) the schematic diagram is that two output ports are connected through a switch; (c) the circuit is a schematic diagram of the mutual connection of circuits formed by connecting two output ports in parallel through a switch and a current-limiting resistor; (d) the circuit is a schematic diagram of the mutual connection of two output ports through a circuit formed by connecting a switch and a current-limiting resistor in parallel and then connecting the switch in series; (e) the circuit is a schematic diagram of the mutual connection of two output ports through a circuit formed by connecting a switch and a current-limiting resistor in series and then connecting the switch in parallel;
FIG. 4 is a schematic diagram showing the overall structure of embodiment 2 of the operation system of the present invention;
fig. 5 is a schematic diagram of a single-phase ac-side interface circuit, (a) is a schematic diagram of a connection between two output ports of the single-phase ac-side interface circuit by a wire; (b) the circuit is a schematic diagram of the connection between two output ports of a single-phase alternating-current side interface circuit through two reactors; (c) the circuit is a schematic diagram of the connection between two output ports of a single-phase alternating-current side interface circuit through a three-phase winding; (d) the two output ports of the single-phase alternating-current side interface circuit are connected with the two bidirectional phase windings.
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.
Example 1
As shown in fig. 1, the three-phase power electronic transformer operating system of the present invention includes a first power electronic transformer S1, a second power electronic transformer S2, an ac side interface circuit, and a dc side interface circuit, wherein the first power electronic transformer S1 is used as a measured object, and the second power electronic transformer S2 is used as an analog load.
The first power electronic transformer S1 and the second power electronic transformer S2 respectively comprise a grid-side converter and an isolated dc converter; the alternating current sides of the power grid side converters of the two power electronic transformers are respectively connected with an alternating current side interface circuit, and the direct current sides of the power grid side converters are respectively connected with the direct current input sides of the isolated direct current converters; the direct current output sides of the isolated direct current converters of the two power electronic transformers are respectively connected with a direct current side interface circuit.
The alternating-current side interface circuit comprises an input port IN, a first output port OUT1 and a second output port OUT2, wherein the input port IN is connected with a power grid, and the two output ports are respectively connected with the alternating-current sides of the two power electronic transformers.
The dc side interface circuit includes a first output port P1 and a second output port P2, which are connected to the dc output sides of the two power electronic transformers.
The interface form of the ac side interface circuit in embodiment 1 is shown in fig. 2, as shown in fig. 2 (a): directly connecting the input port IN, the first output port OUT1 and the second output port OUT 2; as shown in fig. 2 (b): the input port IN is connected with the first output port OUT1 through a first reactor L1, and the input port IN is connected with the second output port OUT2 through a second reactor L2; as shown in fig. 2 (c): the input port IN is connected with a primary winding of a three-winding transformer T1, and the first output port OUT1 and the second output port OUT2 are respectively connected with a secondary winding of the three-winding transformer T1; as shown in fig. 2 (d): the input port IN is connected to the primary windings of the two-winding transformers T1 and T2, and the first output port OUT1 and the second output port OUT2 are connected to the secondary windings of the two-winding transformers T1 and T2, respectively.
The interface format of the dc side interface circuit in embodiment 1 is shown in fig. 3, as shown in fig. 3 (a): directly connecting the first port P1 and the second port P2; as shown in fig. 3 (b): the first port P1 and the second port P2 are connected by a switch KM; as shown in (c), (d), and (e) of fig. 3: the first port P1 and the second port P2 are connected by a combination of a switch KM and a current limiting resistor R; the combination mode of the switch and the current-limiting resistor is not limited to the combination mode in the figure, but when the combination mode of the switch and the current-limiting resistor is adopted, the current-limiting resistor cannot be connected in series in a main loop of the direct-current side interface circuit; in fig. 3 (c), the circuit in which the switch exists in the dc side interface circuit is the main loop; in fig. 3 (d), the circuit in which the two switches are connected in series is the main loop of the dc-side interface circuit, and in fig. 3 (e), the circuit in which the switch KM1 exists is the main loop of the dc-side interface circuit.
Example 2
As shown in fig. 4, the present embodiment is a single-phase power electronic transformer operating system, in which the three-phase ac side interface circuit in embodiment 1 is replaced with a single-phase ac side interface circuit; specific single-phase ac interface circuits are shown in fig. 5 (a), (b), (c), and (d).
The roles of the two power electronic transformers in the power electronic transformer operation systems of the embodiment 1 and the embodiment 2 can be exchanged with each other, so that the respective operation tests of the two power electronic transformers can be realized, the two existing power electronic transformers can be utilized, the alternating current side is directly connected with or additionally provided with two reactors or additionally provided with a three-winding transformer or additionally provided with two double-winding transformers to be connected to a power grid, the direct current side is directly connected with or additionally provided with a switch or a combination of the switch and a resistor to be connected with each other, and the functions of the respective operation tests can be realized by combining the adjustment of a control method.
In embodiment 1 or 2, the method for controlling an operation system of a power electronic transformer, in which a first power electronic transformer S1 is used as a measurement object and a second power electronic transformer S2 is used as an analog load, includes the steps of:
(1) starting a first power electronic transformer serving as a tested object, connecting the first power electronic transformer to a power grid through an alternating-current side interface circuit, and controlling to enable the direct-current side voltage of a power grid side converter to be stable, wherein the direct-current output side voltage of an isolated direct-current converter is a set value;
(2) starting a second power electronic transformer serving as an analog load, connecting the second power electronic transformer to a power grid through an alternating-current side interface circuit, controlling to enable the direct-current side voltage of a power grid side converter to be stable, and enabling the direct-current output side voltage of the isolated direct-current converter to track the direct-current side voltage of the first power electronic transformer;
(3) controlling to enable the second power electronic transformer and the first power electronic transformer to be connected in parallel through a direct current side interface circuit, and then controlling the direct current side current of the second power electronic transformer to be 0;
(4) setting a power instruction value of a second power electronic transformer, wherein the power instruction value does not exceed the capacity of the first power electronic transformer, and controlling the power output by the direct current output side of the isolated direct current converter of the second power electronic transformer to track the set power instruction value;
(5) the operation test is carried out on the tested power electronic transformer, and the operation test comprises the following steps:
(5-1) direct current voltage stability: adjusting a power instruction value, controlling the power of the direct current output side of the isolated direct current converter of the second power electronic transformer, enabling the first power electronic transformer to work at different powers, detecting the voltage of the direct current output side of the isolated direct current converter of the first power electronic transformer at different powers, calculating the amplitude difference between the real-time value and the given value of the direct current voltage at different power instruction values, and judging whether the tested power electronic transformer meets the requirement of direct current voltage stability;
(5-2) thermal stability: executing the step (4) to adjust a power instruction value, controlling the power of a direct current output side of an isolated direct current converter of a second power electronic transformer, enabling a first power electronic transformer to work at a rated power within a set time, and detecting the temperature and the damage condition of each component of the first power electronic transformer after the set time is finished to judge whether the tested power electronic transformer meets the requirement of thermal stability;
(5-3) maximum operating capacity: executing the step (4) to adjust a power instruction value, controlling the power of a direct current output side of an isolated direct current converter of a second power electronic transformer, enabling the first power electronic transformer to work at the maximum power within a set time, and detecting the temperature and the damage condition of each component of the first power electronic transformer after the set time is finished to judge whether the tested power electronic transformer meets the requirement of the maximum operation capacity;
(5-4) dynamic response characteristics: and (4) adjusting the power instruction value, controlling the power of the direct current output side of the isolated direct current converter of the second power electronic transformer, simulating the power sudden change of the first power electronic transformer, detecting the change amplitude of the voltage of the direct current output side of the isolated direct current converter of the first power electronic transformer when the power sudden change occurs, and judging whether the tested power electronic transformer meets the requirement of the dynamic response characteristic or not by the time of recovering to a set value.
The power instruction value in the method can be modified in real time and can be sent to a control unit of a second power electronic transformer serving as a simulation load in a real-time communication mode through an upper computer. When the operation test is carried out, the upper computer can be respectively connected with the two power electronic transformers and carries out communication.
The control method is used for controlling the first power electronic transformer and the second power electronic transformer by issuing control instructions to the existing control units of the two power electronic transformers. When one power electronic transformer is finished and another power electronic transformer which is originally taken as a simulation load needs to be subjected to an operation test, control instructions issued by the two power electronic transformers are exchanged so as to exchange roles (a tested object or a simulation load) of the two power electronic transformers in the operation test, and the operation test is carried out again according to the method of the invention, namely the operation test of the two power electronic transformers can be completed by using the same test framework.
In the step (3), the specific method for controlling the parallel connection of the second power electronic transformer and the first power electronic transformer is to achieve the purpose of parallel connection by releasing the locking state of the power electronic switch in the isolated dc converter of the second power electronic transformer on the premise that the dc side output voltages of the two power electronic transformers are equal.
In the step (5-1), the given value of the dc voltage is a dc voltage control target value, that is, a stable voltage target value when the dc side output voltage is controlled to be stable at S1. For example, by adjusting the power of S2 to make it work under various typical load conditions, such as 100kW, 300kW, and 500kW, the dc-side output voltage of S1 is detected, and if the dc-side output voltage of S1 varies greatly at different power values and differs too much from the control target (dc voltage set value), such as 5%, it is considered that the power electronic transformer is unstable, and for this embodiment, the difference of the dc-side output voltage of the power electronic transformer under each condition should not be greater than 5% of 750V, such as 37.5V.
When a thermal stability test of the power electronic transformer is performed, S2 is the load of S1, the power of S2 is adjusted, so that S1 operates at a rated power, such as 500kW, at this time, the system is continuously operated for a period of time, in this embodiment, the operation is set for 72 hours, if the temperatures of the components in S1 are stable and there is no damage to any component, that is, the load carrying capacity of the power electronic transformer is considered to reach 500kW, otherwise, the load carrying capacity of the power electronic transformer is considered to not reach 500 kW.
When the maximum operation capacity test of the power electronic transformer is performed, S2 is the load of S1, the power of S2 is adjusted, so that S1 operates at the maximum power, for example, 600kW, at this time, the system is allowed to operate for a period of time, in this embodiment, operation is set for 60 seconds, if the temperatures of the components in S1 are stable and there is no damage to any component, that is, the overload capacity of the power electronic transformer is considered to reach 600kW, otherwise, the overload capacity of the power electronic transformer is considered to not reach 600 kW.
In the step (4), setting the power instruction value further includes setting a power regulation change rate of the second power electronic transformer. When the dynamic response characteristic test of the power electronic transformer is carried out in the step (5-4), the change of the power command value comprises the change of the load capacity value carried by the first power electronic transformer, the power adjusting speed corresponding to the change set in the step (4) is 500kW/s, namely the power command value can be adjusted from 0 to 500kW per second, and the power electronic transformer dynamic response characteristic test method can be used for simulating the situation of sudden load change, reflecting the performance of the power electronic transformer during the sudden load change and being used for the test of the dynamic characteristic of the power electronic transformer.
Under the condition of sudden load change, the dynamic characteristics of the power electronic transformer are examined, namely the change amplitude of the voltage on the direct current output side of the power electronic transformer and the time for recovering to a set value are checked, in the embodiment, the change amplitude does not exceed +/-10%, the time for recovering to a normal value does not exceed 1s, and in the range, the dynamic characteristics of the power electronic transformer can be considered to meet the requirements, otherwise, the requirements are not met.
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 power electronic transformer operating system, comprising: the power supply comprises a first power electronic transformer, a second power electronic transformer, an alternating current side interface circuit and a direct current side interface circuit; the first power electronic transformer comprises: the system comprises a first grid side converter and a first isolated direct current converter; the second power electronic transformer comprises: a second grid-side converter and a second isolated DC converter; the alternating current side interface circuit comprises two output ports and an input port, and the direct current side interface circuit comprises a first output port and a second output port;
the input port of the alternating current side interface circuit is connected with a power grid, one of the two output ports is connected with the alternating current input end of the first power grid side converter, and the other output port is connected with the alternating current input end of the second power grid side converter; the direct-current output end of the first power grid side converter is connected with the direct-current input end of the first isolation type direct-current converter, and the direct-current output end of the second power grid side converter is connected with the direct-current input end of the second isolation type direct-current converter; the direct current output of the first isolation type direct current converter is connected with a first output port of the direct current side interface circuit, and the direct current output of the second isolation type direct current converter is connected with a second output port of the direct current side interface circuit.
2. A power electronic transformer operation system according to claim 1, wherein two output ports of said ac side interface circuit are connected by a wire or two series reactors or a three-phase winding transformer; when the two output ports are connected through a wire or two serially connected reactors or a three-phase winding transformer, the midpoint of the wire or the mutual connection position of the two reactors or the input end of the three-phase winding transformer is used as the input port of the AC side interface circuit; or one of the two output ports of the alternating current side interface circuit is connected with the output end of one double-winding transformer, the other output port is connected with the output end of the other double-winding transformer, and the input ends of the two double-winding transformers are connected in parallel and then serve as the input end of the alternating current side interface circuit.
3. A power electronic transformer operation system according to claim 1 or 2, characterised in that the ac side interface circuit is a single phase ac side interface circuit or a three phase ac side interface circuit.
4. A power electronic transformer operation system according to claim 1, wherein two output ports of the dc side interface circuit are connected in series-parallel with a current limiting resistor through a wire or a switch to form a circuit connection, and when the two output ports are connected in series-parallel with the current limiting resistor through the switch, the current limiting resistor cannot be connected in series in the main loop of the dc side interface circuit.
5. The control method of the power electronic transformer operation system based on claim 1 is characterized by comprising the following steps:
step 1: one of the first power electronic transformer and the second power electronic transformer is used as a tested object, and the other one is used as an analog load; starting a tested object, so that the tested object is connected to an alternating current power grid through an alternating current side interface circuit, the voltage of a direct current output side of a power grid side converter of the tested object reaches a first set value, and the voltage of the direct current output side of an isolated direct current converter reaches a second set value;
starting the analog load, so that the analog load is connected to an alternating current power grid through an alternating current side interface circuit, the voltage of a direct current output side of a power grid side converter of the analog load reaches a third set value, and the voltage of the direct current output side of the isolated direct current converter tracks the voltage of the direct current output side of the isolated direct current converter of the tested object;
and step 3: connecting the direct current output side of the isolated converter of the tested object and the direct current output side of the isolated converter of the analog load in parallel through a direct current side interface circuit, and then controlling the direct current output side current of the isolated converter of the analog load to be 0;
and 4, step 4: setting a power instruction value of the analog load, wherein the power instruction value does not exceed the capacity of the tested object, and enabling the power of the direct current output side of the isolated direct current converter of the analog load to track the set power instruction value;
and 5: and carrying out operation tests on the tested object, wherein the operation tests comprise a direct current stability test, a thermal stability test, a maximum operation capability test and a dynamic response characteristic test.
6. The control method of the power electronic transformer operation system according to claim 5, wherein the direct current stability test specifically comprises: step 4 is executed, the power instruction value of the analog load is adjusted, so that the tested object is in a working state under different powers by controlling the power of the direct current output side of the isolated direct current converter of the analog load, the amplitude difference between the direct current output side voltage of the isolated direct current converter of the tested object and a second set value when different power instruction values are calculated, and if the amplitude difference is greater than or equal to 5% of the second set value, the tested object is determined not to meet the direct current stability requirement;
the thermal stability test specifically comprises the following steps: step 4 is executed, the power instruction value of the analog load is adjusted, so that the power of the direct current output side of the isolated direct current converter of the analog load is controlled, the object to be tested is in rated power operation within the set time, and after the set time is over, whether the object to be tested meets the requirement of thermal stability is judged according to the temperature and the damage condition of each component of the object to be tested;
the maximum operation capability test specifically comprises the following steps: step 4 is executed, the power instruction value of the analog load is adjusted, so that the power of the direct current output side of the isolated direct current converter of the analog load is controlled, the tested object works with the maximum power within the set time, and after the set time is finished, whether the tested object meets the requirement of the maximum operation capacity is judged according to the temperature and the damage condition of each component of the tested object;
the dynamic response characteristic test specifically comprises the following steps: and 4, adjusting the power instruction value of the analog load, simulating the power sudden change of the tested object by controlling and adjusting the power of the direct current output side of the isolated direct current converter of the analog load, and judging whether the tested object meets the requirement of the dynamic response characteristic or not by the change amplitude of the voltage of the direct current side of the isolated direct current converter of the tested object when the power suddenly changes and the time for recovering to the set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010331375.1A CN113640693A (en) | 2020-04-24 | 2020-04-24 | Power electronic transformer operation system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010331375.1A CN113640693A (en) | 2020-04-24 | 2020-04-24 | Power electronic transformer operation system and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113640693A true CN113640693A (en) | 2021-11-12 |
Family
ID=78414796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010331375.1A Pending CN113640693A (en) | 2020-04-24 | 2020-04-24 | Power electronic transformer operation system and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113640693A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016015330A1 (en) * | 2014-08-01 | 2016-02-04 | 冷再兴 | Fly-back dc/ac conversion circuit with plurality of windings |
| CN106099948A (en) * | 2016-08-30 | 2016-11-09 | 国网河南省电力公司电力科学研究院 | A kind of power electronics is flexible coupling switch topology and control method thereof |
| CN107607885A (en) * | 2017-08-17 | 2018-01-19 | 南京南瑞继保电气有限公司 | A kind of variable-frequency power sources pilot system and its experimental control method |
| JP2018048948A (en) * | 2016-09-23 | 2018-03-29 | 富士電機株式会社 | Testing device |
| 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 |
| CN113556031A (en) * | 2020-04-24 | 2021-10-26 | 南京南瑞继保电气有限公司 | Power electronic transformer and starting control method thereof |
-
2020
- 2020-04-24 CN CN202010331375.1A patent/CN113640693A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016015330A1 (en) * | 2014-08-01 | 2016-02-04 | 冷再兴 | Fly-back dc/ac conversion circuit with plurality of windings |
| CN106099948A (en) * | 2016-08-30 | 2016-11-09 | 国网河南省电力公司电力科学研究院 | A kind of power electronics is flexible coupling switch topology and control method thereof |
| JP2018048948A (en) * | 2016-09-23 | 2018-03-29 | 富士電機株式会社 | Testing device |
| CN107607885A (en) * | 2017-08-17 | 2018-01-19 | 南京南瑞继保电气有限公司 | A kind of variable-frequency power sources pilot system and its experimental 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 |
| 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 |
| CN113556031A (en) * | 2020-04-24 | 2021-10-26 | 南京南瑞继保电气有限公司 | Power electronic transformer and starting control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111313448B (en) | Energy storage system and method | |
| CN109861261B (en) | EMS-based power balance control method and energy storage control system for energy storage converter | |
| CN108847773B (en) | Multi-module power balancing method for input-series output-parallel full-bridge DC-DC converter | |
| Illindala et al. | Control of distributed generation systems to mitigate load and line imbalances | |
| CN104198853A (en) | Wind power grid integration testing device and testing method | |
| CN108418231B (en) | Hybrid multi-port railway power converter and power coordination control method thereof | |
| CN105591548A (en) | Self-balance type power electronic transformer based on multiport high-frequency transformer | |
| CN111177932B (en) | Modeling method for improving electromagnetic transient simulation speed of flexible substation | |
| CN113655324A (en) | Converter valve operation test topology platform | |
| CN113759292A (en) | Distribution transformer short circuit test device and test method | |
| CN113991670A (en) | Alternating-current flexible loop closing control device for power grid and control method thereof | |
| CN109787266A (en) | Extra-high voltage direct-current complex fault on-line analysis decision-making technique and system | |
| CN107607885A (en) | A kind of variable-frequency power sources pilot system and its experimental control method | |
| CN111525828B (en) | Control method of bidirectional isolation type resonant power converter based on virtual synchronous motor | |
| CN111682558B (en) | Control method for fast and constant power of grid-connected tie line of self-contained power plant | |
| Liu et al. | A scaled-down microgrid laboratory testbed | |
| CN204858577U (en) | Reactive power compensator based on two many level of H bridge modularization transverters | |
| CN108832660B (en) | Device capable of realizing power electronic island detection and simulating power grid alternating current source | |
| CN113640693A (en) | Power electronic transformer operation system and control method | |
| CN221039284U (en) | Power cycle testing device of high-power multi-voltage energy storage converter | |
| CN210927109U (en) | Energy storage converter and static var generator all-in-one, low pressure distribution station | |
| CN114389297B (en) | Commutation failure suppression method and system based on mutual coordination of STATCOM and HVDC predictive control | |
| Qilong | A Power Balance Control Method of Input Independent Output Paralleled DCT for Offshore Wind Energy Systems | |
| Lei | Typical Design and Simulation Experimental Study of DC Micro-grid Control System | |
| Qingguang et al. | RESEARCH OF THE THEORY AND APPLICATION OF AUXILIARY FREQUENCY MODULATION BASED ON THE ENERGY STORAGE IN GAS TURBINE UNIT OF OFFSHORE OIL PLATFORM |
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 |