CN113030613B - Direct-current transformer complete machine test system and method - Google Patents
Direct-current transformer complete machine test system and method Download PDFInfo
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- CN113030613B CN113030613B CN202110223833.4A CN202110223833A CN113030613B CN 113030613 B CN113030613 B CN 113030613B CN 202110223833 A CN202110223833 A CN 202110223833A CN 113030613 B CN113030613 B CN 113030613B
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Abstract
The invention provides a direct current transformer complete machine test system and a method, relating to the field of electronic circuits, wherein the system comprises: the alternating current-direct current converter device, the alternating current incoming line contact control device and the direct current contact control device; the alternating current-direct current converter device is electrically connected with an alternating current power grid through an alternating current incoming line contact control device; the alternating current-direct current converter device is electrically connected with the direct current transformer device to be tested through the direct current contact control device; the direct current transformer device to be tested comprises a plurality of direct current transformers to be tested which are connected in parallel; and the alternating current incoming line contact control device and the direct current contact control device are used for controlling the on-off state of a circuit between the alternating current-direct current converter device and the direct current transformer device to be tested so as to carry out complete machine test on the direct current transformer to be tested. The embodiment of the invention can be used for testing the whole high-capacity direct-current transformer and achieves the effects of low loss, flexible test and multiple functions.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a complete machine test system and a complete machine test method for a direct-current transformer.
Background
The direct current transformer is a core device of an energy internet, and is a novel power electronic device which combines a power electronic conversion technology and a high-frequency electric energy conversion technology based on an electromagnetic induction principle and has the functions of but not limited to a traditional power frequency alternating current transformer. The functions of a dc transformer generally include at least the voltage class conversion, energy transmission, and electrical isolation functions of a conventional ac transformer, and in addition, include ac-side reactive power compensation, power factor adjustment and harmonic suppression, dc access of renewable energy sources/energy storage devices, fault isolation between ports, and communication functions with other intelligent devices. According to the traditional test thought of the whole direct-current transformer, a power supply and a load corresponding to the capacity of the direct-current transformer are needed during the test of the whole direct-current transformer, the test equipment is high in cost, large in power consumption and complex in operation, and the influence is particularly obvious during the test of the large-capacity equipment. The direct current transformer is used as core equipment for realizing energy routing, the capacity can reach MW level, and the consumed energy is very large.
In the prior art, a similar test system consisting of a three-phase uncontrollable rectifier bridge and two to-be-tested direct-current transformer power modules is provided in the first scheme and the second scheme. In the third existing scheme, a method for testing a direct-current power distribution and utilization system composed of two MMC current converters and two direct-current transformers is provided, the influence of direct-current side grounding on the system is tested and researched, and performance analysis of key equipment of a direct-current distribution network and a protection strategy during fault are carried out. But a testing method suitable for multiple functions of the direct current transformer is not specifically provided, and meanwhile, the system needs an MMC to provide a direct current power supply, a true and false bipolar compatible direct current distribution network system is constructed, so that the cost is high and the difficulty is high. Most of the existing testing methods for the direct current transformer are tests for the power module, the control strategy, the electromagnetic environment and the like of the module test are not completely the same as those of the whole machine, and the functions and the performance of the whole machine cannot be accurately reflected.
Disclosure of Invention
The invention provides a direct current transformer complete machine test system and a direct current transformer complete machine test method, which can provide valuable test data for complete machine and system research, and reduce equipment cost and energy consumption cost of related tests.
In a first aspect, an embodiment of the present invention provides a complete dc transformer testing system, where the system includes: the alternating current-direct current converter device, the alternating current incoming line contact control device and the direct current contact control device; the alternating current-direct current converter device is electrically connected with an alternating current power grid through the alternating current incoming line contact control device; the alternating current-direct current converter device is electrically connected with the direct current transformer device to be tested through the direct current contact control device; the direct current transformer device to be tested comprises a plurality of direct current transformers to be tested which are connected in parallel; the alternating current incoming line contact control device and the direct current contact control device are used for controlling the on-off state of a circuit between the alternating current-direct current converter device and the direct current transformer device to be tested so as to carry out complete machine test on the direct current transformer to be tested.
In a second aspect, an embodiment of the present invention further provides a method for testing a complete dc transformer, which is applied to the system for testing a complete dc transformer; the method comprises the following steps: the alternating current incoming line contact control device and the direct current contact control device control the on-off state of a circuit between the alternating current-direct current converter device and the direct current transformer device to be tested so as to test the complete machine of the direct current transformer to be tested; the direct current transformer device to be tested comprises a plurality of direct current transformers to be tested which are connected in parallel.
In a third aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the complete dc transformer testing method when executing the computer program.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program for executing the above method for testing a complete dc transformer is stored in the computer-readable storage medium.
The embodiment of the invention brings the following beneficial effects: the embodiment of the invention provides a direct current transformer complete machine test scheme, and the system comprises: the alternating current-direct current converter device, the alternating current incoming line contact control device and the direct current contact control device; the alternating current-direct current converter device is electrically connected with an alternating current power grid through an alternating current incoming line contact control device; the alternating current-direct current converter device is electrically connected with the direct current transformer device to be tested through the direct current contact control device; the direct current transformer device to be tested comprises a plurality of direct current transformers to be tested which are connected in parallel; and the alternating current incoming line contact control device and the direct current contact control device are used for controlling the on-off state of a circuit between the alternating current-direct current converter device and the direct current transformer device to be tested so as to carry out complete machine test on the direct current transformer to be tested. The embodiment of the invention can be used for testing the whole high-capacity direct-current transformer and achieves the effects of low loss, flexible test and multiple functions.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a complete machine test system of a dc transformer according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a complete machine test of a dc transformer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a topology of a dc transformer to be tested based on a dual-active bridge topology according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a dc bus voltage test according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of another DC bus voltage test according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a power control and voltage control functional test according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of another power and voltage control functional test provided by an embodiment of the present invention;
FIG. 8 is a block diagram of a computer device according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a topology structure of a power module of an LLC dc converter provided in the embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, most of testing methods of the direct current transformer are testing power modules, and the testing methods for the whole machine are few.
Based on this, the complete machine test system and method for the direct current transformer provided by the embodiment of the invention can test multiple functions of power step, voltage control, droop control, fault ride-through and the like, and realize a test platform and test which are low in loss, flexible in test, various in functions and suitable for a large-capacity direct current transformer.
In order to facilitate understanding of the embodiment, a detailed description is first given to a complete dc transformer testing system disclosed in the embodiment of the present invention.
The embodiment of the invention provides a direct current transformer complete machine test system, which is shown in a structural block diagram of a direct current transformer complete machine test system shown in figure 1 and comprises the following components:
the system comprises an alternating current-direct current converter device 12, an alternating current incoming line contact control device 11 and a direct current contact control device 13; the alternating current-direct current converter device is electrically connected with an alternating current power grid through an alternating current incoming line contact control device; the alternating current-direct current converter device is electrically connected with the direct current transformer device to be tested through the direct current contact control device; the direct current transformer device to be tested comprises a plurality of direct current transformers to be tested which are connected in parallel; and the alternating current incoming line contact control device and the direct current contact control device are used for controlling the on-off state of a circuit between the alternating current-direct current converter device and the direct current transformer device to be tested so as to carry out complete machine test on the direct current transformer to be tested.
In the embodiment of the invention, the alternating current incoming line contact control device can control the connection state of the whole device and an alternating current power grid to switch on a power supply for a system. The direct current transformer device to be tested comprises a plurality of direct current transformers to be tested which are connected in parallel, and it should be noted that the number of the direct current transformers to be tested which are connected in parallel in the direct current transformer device to be tested depends on whether the capacities of the various test articles are matched, and the number of the direct current transformers to be tested can be set according to requirements.
The direct current contact control device may include a plurality of direct current contact control units, and the number of the direct current contact control units may be determined according to the number of the direct current transformers to be tested. A plurality of direct current transformers to be tested in the direct current transformer device to be tested are electrically connected in parallel, and the circuit connection state in the direct current transformer complete machine test system is controlled through the alternating current incoming line contact control device and the direct current contact control device, so that complete machine test is carried out on the direct current transformers to be tested in the direct current transformer device to be tested.
The embodiment of the invention provides a complete machine test scheme of a direct current transformer, and the system comprises: the alternating current-direct current converter device, the alternating current incoming line contact control device and the direct current contact control device; the alternating current-direct current converter device is electrically connected with an alternating current power grid through an alternating current incoming line contact control device; the alternating current-direct current converter device is electrically connected with the direct current transformer device to be tested through the direct current contact control device; the direct current transformer device to be tested comprises a plurality of direct current transformers to be tested which are connected in parallel; and the alternating current incoming line contact control device and the direct current contact control device are used for controlling the on-off state of a circuit between the alternating current-direct current converter device and the direct current transformer device to be tested so as to carry out complete machine test on the direct current transformer to be tested. The embodiment of the invention can be used for testing the whole high-capacity direct-current transformer and achieves the effects of low loss, flexible test and multiple functions.
In one embodiment, in order to improve the test efficiency, the AC incoming line contact control device comprises an AC incoming line contactor; the alternating current-direct current converter device comprises a first alternating current-direct current converter and a second alternating current-direct current converter; the direct current contact control device comprises a first direct current contactor, a second direct current contactor, a third direct current contactor and a fourth direct current contactor; the direct current transformer device to be tested comprises a first direct current transformer to be tested, a second direct current transformer to be tested and a third direct current transformer to be tested.
In one embodiment, in order to improve the flexibility of the test and meet various test requirements, the alternating current side of the first alternating current-direct current converter and the alternating current side of the second alternating current-direct current converter are connected in parallel and are electrically connected with an alternating current power grid through an alternating current incoming line contactor; the direct current side of the first alternating current-direct current converter is connected with the low-voltage side of the first direct current transformer to be tested through a first low-voltage side contactor; the direct current side of the second alternating current-direct current converter is electrically connected with the low-voltage side of a third direct current transformer to be tested through a third low-voltage side contactor; the high-voltage side of the first direct-current transformer to be tested, the high-voltage side of the third direct-current transformer to be tested and the high-voltage side of the second direct-current transformer to be tested are connected in parallel; the low-voltage side of the second direct current transformer to be tested is connected in parallel with the low-voltage side of the first direct current transformer to be tested through a second low-voltage side contactor and the first direct current contactor; the low-voltage side of the second direct current transformer to be tested is connected in parallel with the low-voltage side of the third direct current transformer to be tested through a second low-voltage side contactor and a second direct current contactor; a third direct current contactor is arranged between low-voltage side buses of the second direct current transformer to be tested; the first direct current contactor is connected with the second low-voltage side contactor through a third direct current contactor; the second direct current contactor is connected with the second low-voltage side contactor through a third direct current contactor; and a fourth direct current contactor is arranged between the high-voltage side buses of the second direct current transformer to be tested and is connected with the high-voltage side of the second direct current transformer to be tested through a second high-voltage side contactor.
It should be noted that the dc transformer to be tested is usually provided with a low-voltage side contactor and a high-voltage side contactor. In the embodiment of the invention, the device comprising the direct current transformer to be tested comprises a first direct current transformer to be tested, a second direct current transformer to be tested and a third direct current transformer to be tested, wherein the first direct current transformer to be tested comprises a first low-voltage side contactor and a first high-voltage side contactor, the second direct current transformer to be tested comprises a second low-voltage side contactor and a second high-voltage side contactor, and the third direct current transformer to be tested comprises a third low-voltage side contactor and a third high-voltage side contactor.
In one embodiment, the dc transformer to be tested is any one or a combination of the following converters: the device comprises a double-active-bridge direct current converter, an LLC direct current converter and a three-level double-active-bridge direct current converter.
It should be noted that a possible topology of the LLC dc converter power module is shown in fig. 9, where L denotes an inductor and C denotes a capacitor.
In one embodiment, the ac-dc converter arrangement comprises any one or a combination of the following converters: bidirectional energy storage converters and modular multilevel converters.
The implementation of the device is described below in terms of specific examples.
Referring to a circuit diagram of the transformer complete machine test shown in fig. 2, a connection structure of each component of the device is explained first. The test circuit of the direct current transformer comprises a first alternating current-direct current converter 1, a second alternating current-direct current converter 5, a first direct current transformer 2 to be tested, a second direct current transformer 3 to be tested and a third direct current transformer 4 to be tested. An alternating current incoming contactor K1, a first direct current contactor S1, a second direct current contactor S2, a third direct current contactor S3 and a fourth direct current contactor S4. First low-voltage side contactor Q L1 First, aHigh-voltage side contactor Q H1 Second low-voltage side contactor Q L2 Second high-voltage side contactor Q H2 Third low-voltage side contactor Q L3 Third high-voltage side contactor Q H3 。
The alternating current sides of a first alternating current-direct current converter (hereinafter referred to as a first AC/DC) and a second alternating current-direct current converter (hereinafter referred to as a second AC/DC) are connected in parallel, and the voltage of the alternating current side of the first alternating current-direct current converter and the alternating current side of the second alternating current-direct current converter are connected with an external alternating current power grid and can be 380V; the direct current side of the first AC/DC is connected with a first direct current transformer to be tested. And the direct current side of the second AC/DC is connected with a low-voltage side bus of a third direct current transformer to be tested.
The high-voltage side direct current buses of the first direct current transformer to be tested, the second direct current transformer to be tested and the third direct current transformer to be tested are in the same voltage class, and can be 20kV in an example; the low-side dc bus is at the same voltage level, which may be 750V, for example. The high-voltage sides of the first direct current transformer to be tested, the second direct current transformer to be tested and the third direct current transformer to be tested are connected in parallel. The low-voltage side bus of the second direct-current transformer to be tested is connected in parallel with the low-voltage side bus of the first direct-current transformer to be tested through the first direct-current contactor S1, and is connected in parallel with the low-voltage side bus of the third electronic transformer to be tested through the second direct-current contactor S2. And the low-voltage side bus of the second direct-current transformer to be tested is indirectly connected with a third direct-current contactor S3, and the high-voltage side bus is indirectly connected with a fourth direct-current contactor S4. The low-voltage side bus and the high-voltage side bus of the first direct current transformer to be tested are respectively connected with the direct current contactor and the direct current contactor, the low-voltage side bus and the high-voltage side bus of the second direct current transformer to be tested are respectively connected with the direct current contactor and the direct current contactor, and the low-voltage side bus and the high-voltage side bus of the third direct current transformer to be tested are respectively connected with the direct current contactor and the direct current contactor.
It should be noted that the first, second, and third dc transformers to be tested may adopt at least one of a dual-active-bridge dc converter, an LLC dc converter, and a three-level dual-active-bridge dc converter, or may be a plurality of them. Fig. 3 shows a schematic diagram of a dc transformer topology to be tested based on a dual active bridge topology, where the dc transformer is in an Input Series Output Parallel (ISOP) form.
By using the device, the overall test of the direct current transformer is carried out according to the following method, and the test method comprises the tests of a low-voltage side direct current bus voltage control mode M1, a high-voltage side direct current bus voltage control mode M2, a power control mode M3, a droop control mode M4, a low-voltage side fault ride-through function M5, a high-voltage side fault ride-through function M6 and a control mode switching function M7. The test procedures are described below:
referring to the circuit diagram of a DC bus voltage control test shown in FIG. 4, K1 is closed, S1, S2, S3, S4 and Q are opened L2 ，Q H2 Closing of Q L1 ，Q H1 ，Q L3 ，Q H3 And sequentially connecting the first AC/DC, the first direct current transformer to be tested, the third direct current transformer to be tested and the second AC/DC into a loop. The first AC/DC is in a voltage control mode at a low-voltage direct-current side, the first direct-current transformer to be tested is in a voltage control mode at a high-voltage direct-current side, the third direct-current transformer to be tested is in a voltage control mode at a low-voltage direct-current side, and the second AC/DC is in a power control mode. The loop can simultaneously test the voltage capability M2 of the high-voltage side bus controlled by the first direct-current transformer to be tested and the voltage capability M1 of the low-voltage side bus controlled by the third direct-current transformer to be tested.
Referring to FIG. 5, another circuit diagram for controlling DC bus voltage test is shown, closing K1, opening S1, S2, S3, S4 and Q L2 ，Q H2 Closed Q L1 ，Q H1 ，Q L3 ，Q H3 And sequentially connecting the first AC/DC, the first direct current transformer to be tested, the third direct current transformer to be tested and the second AC/DC into a loop. The first AC/DC is in a power control mode, the first direct current transformer to be tested is in a low-voltage direct current side voltage control mode, the third direct current transformer to be tested is in a high-voltage direct current side voltage control mode, and the second AC/DC is in a low-voltage side voltage control mode. The circuit can simultaneously test the voltage capability M1 of the low-voltage side bus controlled by the first direct current transformer to be tested and the voltage capability M2 of the high-voltage side bus controlled by the third direct current transformer to be tested.
Referring to the circuit diagram of a power and voltage control functional test shown in FIG. 6, K1 is closed, and S1, S2, S3, S4 and Q are opened L2 ，Q H2 Closed Q L1 ，Q H1 ，Q L3 ，Q H3 The first AC/DC and the first direct current to be tested are usedThe transformer, the third direct current transformer to be tested and the second AC/DC are sequentially connected into a loop. The first AC/DC is in a voltage control mode at a low-voltage direct-current side, the first direct-current transformer to be tested is in a voltage control mode at a high-voltage direct-current side, the third direct-current transformer to be tested is in a power control mode, and the second AC/DC is in a voltage control mode at a low-voltage side. The loop can simultaneously test the capacity M2 of the first DC transformer to be tested for controlling the high-voltage side bus voltage and the capacity M3 of the third DC transformer to be tested for controlling the power.
Referring to FIG. 7, another circuit diagram for power and voltage control functional testing is shown, K1 is closed, S1 and S2 are closed, the first AC/DC is connected in parallel with the second AC/DC side, and S3, S4 and Q are opened L2 ，Q H2 Closed Q L1 ，Q H1 ，Q L3 ，Q H3 And enabling the first direct current transformer to be tested and the third direct current transformer to be tested to form a loop. The first AC/DC and the second AC/DC are connected in parallel, and are in a droop control mode to control the voltage of a low-voltage side bus, the first direct current transformer to be tested is in a voltage control mode at a high-voltage direct current side, and the third direct current transformer to be tested is in a power control mode. The loop can simultaneously test the capacity M2 of the first DC transformer to be tested for controlling the high-voltage side bus voltage and the capacity M3 of the third DC transformer to be tested for controlling the power.
The test mode may also be, K1 closed, S1 closed, S2 open, S3 open, S4 open, Q closed, connecting the first AC/DC in parallel with the second AC/DC side L1 ，Q H1 ，Q L2 ，Q H2 ，Q L3 ，Q H3 And enabling the first direct current transformer to be tested and the third direct current transformer to be tested to form a loop. The first AC/DC and the second AC/DC are connected in parallel, are in a droop control mode, and control the voltage of the low-voltage side bus; the first direct current transformer to be tested is in a power control mode, the second direct current transformer to be tested is connected with the third direct current transformer to be tested in parallel, and the second direct current transformer to be tested is in a droop control mode to control the voltage of a high-voltage side bus. The loop can simultaneously test the first DC transformer to be tested in the power control mode M3 and the second and third DC transformer to be tested in the droop control mode M4.
The test mode may also be, closed K1, closed Q L1 ，Q H1 Open S1, S2, S3, S4, Q L2 ，Q H2 ，Q L3 ，Q H3 . And the first AC/DC is in a low-voltage side bus voltage control mode, the first direct current transformer to be tested is in a high-voltage side voltage control mode, and after stable operation, the S3 is closed, and the low-voltage side no-load fault crossing function M5 of the first direct current transformer to be tested is tested.
The test mode may also be, closed K1, open S1, S2, S3, S4, Q L2 ，Q H2 Closed Q L1 ，Q H1 ，Q L3 ，Q H3 And sequentially connecting the first AC/DC, the first direct current transformer to be tested, the third direct current transformer to be tested and the second AC/DC into a loop. The first AC/DC is in a voltage control mode at a low-voltage direct-current side, the first direct-current transformer to be tested is in a voltage control mode at a high-voltage direct-current side, the third direct-current transformer to be tested is in a power control mode, and the second AC/DC is in a voltage control mode at a low-voltage side. When the first dc transformer to be tested and the third dc transformer to be tested are in full-load stable operation, S3 is closed, and the loop can simultaneously test the full-load fault crossing function M5 on the low-voltage sides of the first dc transformer to be tested and the third dc transformer to be tested.
The test mode may also be, closed K1, closed Q L1 ，Q H1 Open S1, S2, S3, S4, Q L2 ，Q H2 ，Q L3 ，Q H3 . And the first AC/DC is in a low-voltage side bus voltage control mode, the first direct current transformer to be tested is in a high-voltage side voltage control mode, and after stable operation, the S4 is closed, and the high-voltage side no-load fault ride-through function M6 of the first direct current transformer to be tested is tested.
The test mode may also be, closed K1, open S1, S2, S3, S4, QL2, QH2, closed Q L1 ，Q H1 ，Q L3 ，Q H3 And sequentially connecting the first AC/DC, the first direct current transformer to be tested, the third direct current transformer to be tested and the second AC/DC into a loop. The first AC/DC is in a voltage control mode at a low-voltage direct-current side, the first direct-current transformer to be tested is in a voltage control mode at a high-voltage direct-current side, the third direct-current transformer to be tested is in a power control mode, and the second AC/DC is in a voltage control mode at a low-voltage side. When the first dc transformer to be tested and the third dc transformer to be tested are operating stably in full load, the circuit is closed S4, and the first dc transformer to be tested and the third dc transformer to be tested can be tested simultaneouslyAnd a full-load fault ride-through function M6 on the high-voltage sides of the direct current transformer to be tested and the third direct current transformer to be tested.
The test mode may also be, closing K1, closing S1, S2, connecting the first AC/DC in parallel with the second AC/DC side, opening S3, S4, Q L2 ，Q H2 Closed Q L1 ，Q H1 ，Q L3 ，Q H3 And enabling the first direct current transformer to be tested and the third direct current transformer to be tested to form a loop. The first AC/DC and the second AC/DC are connected in parallel, and are in a droop control mode to control the voltage of a low-voltage side bus, the first direct current transformer to be tested is in a voltage control mode at a high-voltage direct current side, and the third direct current transformer to be tested is in a power control mode. After stable operation, the first direct current transformer to be tested is switched to a power control mode, and meanwhile, the third direct current transformer to be tested is switched to a high-voltage side voltage control mode. The circuit can simultaneously test the control mode switching function M7 of the first dc transformer to be tested and the third dc transformer to be tested.
In the embodiment of the invention, the Q can be switched among S1, S2, S3, S4 and Q L1 ，Q H1 ，Q L2 ，Q H2 ，Q L3 ，Q H3 And when the test is finished, the first direct current transformer to be tested, the second direct current transformer to be tested and the third direct current transformer to be tested are combined and connected into the test loop, and the control modes of the first AC/DC, the second AC/DC and the three direct current transformers to be tested are switched, so that the test of the M1-M7 modes of the three devices to be tested is realized.
It should be noted that, in the embodiment of the present invention, the positions of the high-voltage and low-voltage buses of the dc transformer to be tested may be exchanged, and the corresponding control modes are also exchanged correspondingly, that is, the bus connected to the bidirectional converter may be a high-voltage side bus, and the low-voltage side buses of the three dc transformers are connected in parallel.
The embodiment of the invention provides a complete machine test system and a complete machine test method for a direct-current transformer, provides a complete machine test loop for the direct-current transformer, can be used for testing functions and performance of a large-capacity direct-current transformer and a complete machine, and can realize test effects of flexible control, convenient switching and multiple functions while reducing loss by combining the complete machine test scheme provided by the invention. According to the power electronic complete machine test loop provided by the invention, all test equipment are sequentially connected in an end-to-end manner to form a loop, a high-voltage large-capacity power supply is not needed, and the cost of the related test equipment can be reduced; large-capacity load energy consumption is not needed, the energy consumption of the system is low, and the related test energy consumption cost is reduced. The whole machine test loop in the form of the pair-pulling is combined with the whole machine test method of the direct current transformer, different test equipment is switched through contactor control, and multiple control functions of a plurality of direct current transformers to be tested can be tested simultaneously, wherein the functions comprise a voltage control (direct current buses on two sides), a power control (energy bidirectional flow), a droop control, a control mode switching and the like required in the actual operation of the direct current transformer, and the performances of the whole machine control protection system, an electromagnetic characteristic, an aging characteristic, a thermal balance characteristic and the like are verified, so that valuable test data are provided for the research of the whole machine and the system.
The embodiment of the invention also provides a direct current transformer complete machine testing method, which is described in the following embodiment. Because the principle of solving the problems by the method is similar to that of the direct-current transformer complete machine test system, the implementation of the method can refer to the implementation of the direct-current transformer complete machine test system, and repeated parts are not repeated. The method comprises the following steps:
the alternating current incoming line contact control device and the direct current contact control device control the on-off state of a circuit between the alternating current-direct current converter device and the direct current transformer device to be tested so as to test the complete machine of the direct current transformer device to be tested; the direct current transformer device to be tested comprises a plurality of direct current transformers to be tested which are connected in parallel.
In one embodiment, the method comprises: and controlling the on-off state of the alternating current incoming line contactor, the first direct current contactor, the second direct current contactor, the third direct current contactor, the fourth direct current contactor, the first low-voltage side contactor, the first high-voltage side contactor, the second low-voltage side contactor, the second high-voltage side contactor, the third low-voltage side contactor and the third high-voltage side contactor, and carrying out the complete machine test on each direct current transformer.
In one embodiment, a complete machine test is performed on each dc transformer, including one or more of the following tests: the method comprises the following steps of low-voltage side direct current bus voltage control mode testing, high-voltage side direct current bus voltage control mode testing, power control mode testing, droop control mode testing, low-voltage side fault ride-through function testing, high-voltage side fault ride-through function testing and control mode switching function testing.
The embodiment of the present invention further provides a computer device, referring to the schematic block diagram of the structure of the computer device shown in fig. 8, the computer device includes a memory 81, a processor 82, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the computer program, the steps of any one of the above-mentioned dc transformer complete machine testing methods are implemented.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the computer device described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program for executing any one of the above methods for testing a complete dc transformer is stored in the computer-readable storage medium.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A direct current transformer complete machine test system is characterized by comprising: the alternating current-direct current converter device, the alternating current incoming line contact control device and the direct current contact control device;
the alternating current-direct current converter device is electrically connected with an alternating current power grid through the alternating current incoming line contact control device;
the alternating current-direct current converter device is electrically connected with the direct current transformer device to be tested through the direct current contact control device; the direct current transformer device to be tested comprises a plurality of direct current transformers to be tested which are connected in parallel;
the alternating current incoming line contact control device and the direct current contact control device are used for controlling the on-off state of a circuit between the alternating current-direct current converter device and the direct current transformer device to be tested so as to carry out complete machine test on the direct current transformer to be tested;
the alternating current incoming line contact control device comprises an alternating current incoming line contactor;
the alternating current-direct current converter device comprises a first alternating current-direct current converter and a second alternating current-direct current converter;
the direct current contact control device comprises a first direct current contactor, a second direct current contactor, a third direct current contactor and a fourth direct current contactor;
the direct current transformer device to be tested comprises a first direct current transformer to be tested, a second direct current transformer to be tested and a third direct current transformer to be tested;
the alternating current side of the first alternating current-direct current converter and the alternating current side of the second alternating current-direct current converter are connected in parallel and are electrically connected with an alternating current power grid through the alternating current incoming line contactor;
the direct current side of the first alternating current-direct current converter is connected with the low-voltage side of the first direct current transformer to be tested;
the direct current side of the second alternating current-direct current converter is electrically connected with the low-voltage side of the third direct current transformer to be tested;
the high-voltage side of the first direct-current transformer to be tested, the high-voltage side of the third direct-current transformer to be tested and the high-voltage side of the second direct-current transformer to be tested are connected in parallel;
the low-voltage side of the second direct-current transformer to be tested is connected in parallel with the low-voltage side of the first direct-current transformer to be tested through the first direct-current contactor;
the low-voltage side of the second direct-current transformer to be tested is connected in parallel with the low-voltage side of the third direct-current transformer to be tested through the second direct-current contactor;
the third direct current contactor is arranged between the low-voltage side buses of the second direct current transformer to be tested; the first direct current contactor is connected with the low-voltage side of the second direct current transformer to be tested through the third direct current contactor; the second direct current contactor is connected with the low-voltage side of the second direct current transformer to be tested through the third direct current contactor;
and the fourth direct current contactor is arranged between the high-voltage side buses of the second direct current transformer to be tested.
2. The system according to claim 1, wherein the dc transformer to be tested is any one or a combination of the following converters:
the device comprises a double-active-bridge direct current converter, an LLC direct current converter and a three-level double-active-bridge direct current converter.
3. The system of claim 1, wherein the ac-dc converter means comprises any one or a combination of the following converters:
bidirectional energy storage converters and modular multilevel converters.
4. A DC transformer complete machine test method is characterized in that the method is applied to the DC transformer complete machine test system of any one of claims 1 to 3; the method comprises the following steps:
the alternating current incoming line contact control device and the direct current contact control device control the on-off state of a circuit between the alternating current-direct current converter device and the direct current transformer device to be tested so as to test the complete machine of the direct current transformer to be tested; the direct current transformer device to be tested comprises a plurality of direct current transformers to be tested which are connected in parallel.
5. The method of claim 4, comprising:
and controlling the on-off states of the alternating current incoming line contactor, the first direct current contactor, the second direct current contactor, the third direct current contactor and the fourth direct current contactor, and carrying out complete machine test on each direct current transformer.
6. The method of claim 5, wherein the overall test of each DC transformer comprises one or more of the following tests:
the method comprises a low-voltage side direct-current bus voltage control mode test, a high-voltage side direct-current bus voltage control mode test, a power control mode test, a droop control mode test, a low-voltage side fault ride-through function test, a high-voltage side fault ride-through function test and a control mode switching function test.
7. Computer equipment, comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor implements the complete dc transformer testing method according to any one of claims 4 to 6 when executing the computer program.
8. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the complete dc transformer testing method according to any one of claims 4 to 6.
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| CN113805002B (en) * | 2021-09-17 | 2024-06-18 | 广东电网有限责任公司 | Detection device, method and equipment for power electronic direct current transformer and storage medium |
| CN113917227A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | Energy circulation detection system and method for power module of direct-current transformer |
| CN113917264A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | System and method for detecting power module of flexible loop closing device |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB848444A (en) * | 1956-03-27 | 1960-09-14 | English Electric Co Ltd | Improvements in and relating to electrical protective apparatus for rectifier installations |
| CN103675539A (en) * | 2013-11-27 | 2014-03-26 | 广州智光电气股份有限公司 | Cascaded energy storage converter detecting platform and control method thereof |
| CN104155616A (en) * | 2014-08-12 | 2014-11-19 | 中国科学院电工研究所 | Photovoltaic system current transformer test platform |
| CN104714132A (en) * | 2015-03-17 | 2015-06-17 | 上海交通大学 | Flexible direct current power transmission converter performance testing platform and control method thereof |
| WO2016086460A1 (en) * | 2014-12-02 | 2016-06-09 | 永济新时速电机电器有限责任公司 | Traction converter having divided voltage sampling circuit for bus voltage ground protection |
| KR20170104809A (en) * | 2016-03-08 | 2017-09-18 | 한국전력공사 | Apparatus and method for stabilizing voltage for direct current distribution system |
| CN107947221A (en) * | 2017-12-23 | 2018-04-20 | 西安许继电力电子技术有限公司 | A kind of electric power electric transformer DC Line Fault traversing method |
| CN110138196A (en) * | 2019-03-28 | 2019-08-16 | 深圳市禾望电气股份有限公司 | A kind of multiple branch circuit energy accumulation current converter direct current soft start control method and system |
| WO2019184213A1 (en) * | 2018-03-30 | 2019-10-03 | 北京天诚同创电气有限公司 | Modular converter and control method therefor, and wind turbine |
| CN110618330A (en) * | 2019-09-27 | 2019-12-27 | 上海科梁信息工程股份有限公司 | Current transformer detection platform and detection method |
| CN111781532A (en) * | 2020-07-10 | 2020-10-16 | 北京交通大学 | Circuit and method for realizing aging experiment of three-phase inverter power module |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8278934B2 (en) * | 2009-02-13 | 2012-10-02 | Bae Systems Controls Inc. | Robust AC chassis fault detection using PWM sideband harmonics |
| CN102313850B (en) * | 2011-06-24 | 2014-07-23 | 中国电力科学研究院 | Physical real-time dynamic simulation device for flexible direct current transmission system |
| US20130258732A1 (en) * | 2012-03-27 | 2013-10-03 | General Electric Company | System and method for reducing reactive current in power converter burn-in tests |
-
2021
- 2021-03-01 CN CN202110223833.4A patent/CN113030613B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB848444A (en) * | 1956-03-27 | 1960-09-14 | English Electric Co Ltd | Improvements in and relating to electrical protective apparatus for rectifier installations |
| CN103675539A (en) * | 2013-11-27 | 2014-03-26 | 广州智光电气股份有限公司 | Cascaded energy storage converter detecting platform and control method thereof |
| CN104155616A (en) * | 2014-08-12 | 2014-11-19 | 中国科学院电工研究所 | Photovoltaic system current transformer test platform |
| WO2016086460A1 (en) * | 2014-12-02 | 2016-06-09 | 永济新时速电机电器有限责任公司 | Traction converter having divided voltage sampling circuit for bus voltage ground protection |
| CN104714132A (en) * | 2015-03-17 | 2015-06-17 | 上海交通大学 | Flexible direct current power transmission converter performance testing platform and control method thereof |
| KR20170104809A (en) * | 2016-03-08 | 2017-09-18 | 한국전력공사 | Apparatus and method for stabilizing voltage for direct current distribution system |
| CN107947221A (en) * | 2017-12-23 | 2018-04-20 | 西安许继电力电子技术有限公司 | A kind of electric power electric transformer DC Line Fault traversing method |
| WO2019184213A1 (en) * | 2018-03-30 | 2019-10-03 | 北京天诚同创电气有限公司 | Modular converter and control method therefor, and wind turbine |
| CN110138196A (en) * | 2019-03-28 | 2019-08-16 | 深圳市禾望电气股份有限公司 | A kind of multiple branch circuit energy accumulation current converter direct current soft start control method and system |
| CN110618330A (en) * | 2019-09-27 | 2019-12-27 | 上海科梁信息工程股份有限公司 | Current transformer detection platform and detection method |
| CN111781532A (en) * | 2020-07-10 | 2020-10-16 | 北京交通大学 | Circuit and method for realizing aging experiment of three-phase inverter power module |
Non-Patent Citations (4)
| Title |
|---|
| A commutation failure risk analysis method considering the interaction of inverter stations;WeichenYang;《International Journal of Electrical Power & Energy Systems》;20201231;全文 * |
| Advanced Current-Droop Control for Storage Converters for Fault Ride-ThroughEnhancement;Haining Wang;《IEEE Journal of Emerging and Selected Topics in Power Electronics》;20201231;全文 * |
| 基于移相全桥的并联式开关电源设计;张浩;《中国优秀博硕士学位论文全文数据库(硕士)信息科技辑》;20180215;全文 * |
| 多电平直流链电力电子变压器控制策略研究;张哲;《电力工程技术》;20200731;全文 * |
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