CN108614168B - Full-power test method for power generation field converter - Google Patents
Full-power test method for power generation field converter Download PDFInfo
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- CN108614168B CN108614168B CN201611142752.7A CN201611142752A CN108614168B CN 108614168 B CN108614168 B CN 108614168B CN 201611142752 A CN201611142752 A CN 201611142752A CN 108614168 B CN108614168 B CN 108614168B
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Abstract
The invention discloses a full-power test method for a power generation field converter. The method comprises the following steps: a step of disconnecting the machine-side circuit breaker and the grid-side circuit breaker to disconnect the electrical connection of the converter with the generator and the grid; short-circuiting a three-phase bus between the network side circuit breaker and the network side filter; connecting a direct current pre-charging device to a direct current side capacitor of the power generation field converter; performing the following steps (a) and/or (b): (a) disconnecting the machine side AC fuse to disconnect the electrical connection of the machine side converter and the grid side filter, and closing the grid side AC fuse to perform a grid side full power test of the power plant converter; (b) and electrically connecting the generator side of the generator side AC fuse with the grid side filter, disconnecting the grid side AC fuse to disconnect the electrical connection between the grid side converter and the grid side filter, and closing the generator side AC fuse to perform generator side full power test on the generator side converter.
Description
Technical Field
The invention belongs to the technical field of converters, and particularly relates to a full-power testing method for a power plant converter.
Background
The typical process of generating a power plant generator set is as follows: after the generator converts the natural energy into electric energy, the electric energy output by the generator is converted into an energy form matched with the voltage amplitude, the frequency and the phase of a power grid through the converter, and the electric energy is stably transmitted to the power grid, so that grid connection is finally realized. In the process, the converter is one of key components for smooth grid-connected power generation of the generator set, and the performance index of the converter can directly influence the power quality of a power grid; even if the indexes of the converter do not meet the requirements, the safety of the power grid can be threatened.
For example, in wind power generation, a direct-drive wind turbine generator system is taken as an example, and the direct-drive wind turbine generator system is increasingly widely applied to the field of wind power generation due to the advantages of good power grid and motor friendliness, excellent power grid fault ride-through capability, gearless transmission and the like.
The working process of the typical direct-drive wind generating set is as follows: the wind energy drives the blades of the generator to rotate, the kinetic energy of the blades is converted into electric energy by the synchronous generator, the electric energy output by the generator is converted into an energy form matched with the voltage amplitude, the frequency and the phase of a power grid through the converter, the electric energy is stably transmitted to the power grid, and finally grid connection is achieved. In the process, the converter is one of key components for smooth grid-connected power generation of a unit, and the performance index of the converter can directly influence the power quality of a power grid; even if the indexes of the converter do not meet the requirements, the safety of the power grid can be threatened.
Therefore, before the wind turbine generator is formally on-line and grid-connected for power generation, performance test must be carried out on the wind turbine generator. The test comprises the delivery test of a converter manufacturer and the field test of a wind power complete machine manufacturer in a wind field. GB T25387.2-2010 wind generating set full power converter part 2: test methods the laboratory simulation test method for testing the performance of a current transformer is specified. However, the test environment of the test bed cannot comprehensively simulate various working conditions of a wind field, and cannot predict and faithfully reflect the field service performance of the converter, so the test bed has to perform field test besides simulation test. In field test, when a fan fails, a fault point and a fault reason need to be accurately positioned; the field working condition is different from the test environment of a factory, such as the fluctuation, symmetry, harmonic content and the like of the wind field power grid voltage, and the performance parameters of the converter also need to be debugged and set again on the field; if the field full-power test of the field converter can be realized, the problems of the faults and the performance of all the converters can be determined conditionally, and more complex test and modification work can be carried out on the field, which is the most safe field converter fault detection scheme and debugging scheme with the lowest cost.
Fig. 1 is a structural schematic diagram of an existing wind power converter circulating current full power test system. The wind power converter 9 is mainly composed of the following parts: the grid-side circuit breaker 1 is connected in series with a grid-side filter 3, a grid-side ac fuse 4, a grid-side converter 5, a dc-side capacitor 6, and a machine-side converter 7 in this order, and a machine-side ac fuse 8 is connected in series with the machine-side converter 7. The grid-side circuit breaker 1 is used for controlling the on-off of the wind power converter grid-connected isolation transformer 30; the grid-side filter 3 is used for filtering current harmonics of the wind power converter so as to ensure the electric energy quality of the current; the grid side alternating current fuse 4 is used for protecting the converter under the alternating current overcurrent fault; the grid-side converter 5, the direct-current side capacitor 6 and the machine-side converter 7 jointly form a power part of the wind power converter. Some newer models of converters are also provided with a pre-charging circuit 2 connected in parallel with the grid-side circuit breaker 1, the pre-charging circuit 2 being used to charge the wind-powered dc-side capacitor 6 before the converter is started.
In the circulation test, the grid-side breaker 1 of the wind power converter is connected with the grid isolation transformer 30 through a cable 27, and the machine-side ac fuse 8 is connected with the external machine-side reactor 22 and the machine-side breaker 24 in series through cables 21 and 23 in sequence and is connected to the grid 26 through a cable 25. During the experiment, the network side circuit breaker 1 and the machine side circuit breaker 24 are both in a closed state, so that the network side converter 5 and the machine side converter 7 are both connected with a power grid or connected with the power grid through an isolation transformer, the machine side converter 7 absorbs functional quantity through the power grid, and the functional quantity is fed back to the power grid through the machine side converter 5 connected with the direct current side, so that the function of the full-power operation of the converter is realized.
When running tests on site, various difficulties are encountered when the tests are to be carried out according to the system structure of the laboratory loop current test of fig. 1: (1) an additional experimental site is required; (2) the cost of the isolation transformer, the machine side reactor, the machine side breaker and the like is very high, and excessive cable connection is complex and consumes labor hour; (3) the experimental facilities are too many, so that the mobile transportation and the transformation are not convenient; (4) after the experiment is finished, all parts and cables need to be dismantled for carrying out the next experiment, and the workload is large.
Disclosure of Invention
The embodiment of the invention provides a method for testing the full power of a converter of a power generation field, which is independent of the state of a power grid, has no impact on the power grid, and can repeatedly test the full power of the converter for many times in a short time.
The embodiment of the invention provides a full-power test method for a power plant converter, which comprises the following steps: disconnecting the generator-side circuit breaker and the grid-side circuit breaker to disconnect the electrical connection of the power plant converter with the generator and the grid; short-circuiting a three-phase bus between the network side circuit breaker and the network side filter; connecting a direct current pre-charging device to a direct current side capacitor of the power generation field converter; performing the following steps (a) and/or (b): (a) disconnecting the machine side AC fuse to disconnect the electrical connection of the machine side converter and the grid side filter, and closing the grid side AC fuse to perform a grid side full power test of the power plant converter; (b) and electrically connecting the generator side of the generator side AC fuse with the grid side filter, disconnecting the grid side AC fuse to disconnect the electrical connection between the grid side converter and the grid side filter, and closing the generator side AC fuse to perform generator side full power test on the generator side converter.
According to the full-power test method of the power generation field converter, a pre-charging device which is independent of power supply of a power grid voltage and can work independently is provided on the basis of the existing converter; a three-phase bus short-circuit structure between a converter breaker and a grid-side filter is added to short-circuit three phases of a network-side port of an electric reactor of the grid-side filter, so that a loop is provided for the electric reactor current in the full-power test of the network side and the machine side; a network side and machine side cable connection structure is added to connect the machine side converter and the network side reactor through a cable in field test, so that a current path is provided for the current of the machine side converter to flow to the load network side reactor when the machine side converter is in full power test; the ac fuse of disconnection machine side or net side, realize the full power test condition of net side or machine side, need not increase isolation transformer and machine side cabinet outer reactor and cutout etc. experiment is with low costs, thereby it is simple and consume man-hour few not have too much cable junction test procedure, simultaneously owing to need not additionally increase experimental facilities, still have the advantage of being convenient for remove transportation and site transformation, need not demolish all parts and cable after the test is finished in order to carry out the experiment next time, and then reduced work load. The method for detecting the full power of the converter does not depend on a power grid or input energy, gets rid of the restriction of the external environment of field work, and has wider adaptability. The test of the converter can be independent of the state of a power grid, has no impact on the power grid, and can repeatedly carry out power experiments on the converter for many times in a short time; similarly, the converter is started and stopped without depending on a generator system, so that the whole generator machinery and an electric control system are not required to be mobilized, the full-power test condition of the converter side and the network side is not required to be started without depending on the generator system, an additional experiment field is not required, and the detection space is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a circulating current full-power test system of an existing wind power converter;
FIG. 2 is a schematic diagram of a field test connection structure of a wind power converter according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a system of a wind power converter testing method when performing a full power test according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method of testing a wind power converter according to an embodiment of the invention;
FIG. 5 is a schematic circuit diagram of a wind power converter testing method according to an embodiment of the present invention when performing a grid-side full power test;
fig. 6 is a schematic circuit diagram of a wind power converter testing method when performing a machine-side full power test according to an embodiment of the present invention.
In the figure:
1. a grid-side circuit breaker; 2. a precharge circuit; 3. a network-side filter;
3', testing a load network side reactor; 4. a network-side AC fuse;
5. a grid-side converter; 6. a direct current side capacitor; 7. a machine side converter;
8. a machine side AC fuse; 9. a wind power converter;
10. a three-phase bus short-circuit structure; 11. a DC pre-charging device;
21. a cable; 22. a side reactor is externally connected; 23. a cable; 24. a machine side breaker;
25. a cable; 26. a power grid; 27. a cable; 28. a machine side cable connection structure;
29. a network side cable connection structure; 30. a grid isolation transformer; 40. a wind power generator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers may be exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Continuing to take a wind power generation scene as an example, fig. 2 is a schematic diagram of a field test connection structure of a wind power converter according to an embodiment of the present invention, and if the method of fig. 1 is not adopted, but conditions and connections of a wind field are used, a general field test connection method of the wind power converter is shown in fig. 2. Here, the external machine side reactor 22 is not used, and the machine side ac fuse 8 is connected to the generator 40 through the cable 23. The connecting cable 25 is eliminated and the machine-side converter 7 no longer absorbs active energy from the grid but obtains energy from the generator. The wind power converter 9 is connected with the power grid and the generator respectively, and the whole wind power system is started during operation according to on-site working conditions, so that the purpose of fault detection is hardly achieved by independently performing full-power operation on the wind power converter under certain conditions. The existing wind power converter lacks the on-site full-power current testing function and condition, and can only adopt on-site repeated debugging and running with fan load to mobilize the whole fan system to detect the fault of the converter; this will have an impact on the entire fan system and the grid and, because the wind speed is uncertain at the site, the site may not be able to guarantee the conditions required to reach full power operation. And the demolished steel is transported to a manufacturer for detection and maintenance, so that the problems of long construction period, high cost and large loss of field wind resources are faced.
Since fig. 1 and fig. 2 show that the existing full-power testing method for the converter has the above-mentioned defects, in order to solve the above-mentioned technical problems, a wind farm scenario is taken as an example below to describe in detail a full-power testing method for a power farm converter provided by an embodiment of the present invention.
FIG. 3 is a schematic structural diagram of a system of a wind power converter testing method when performing a full power test according to an embodiment of the present invention; fig. 4 is a flowchart of a method of testing a wind power converter according to an embodiment of the present invention. As shown in fig. 3 and 4, the method for testing the full power of the power plant converter comprises the following steps: s410, the machine side breaker 24 and the grid side breaker 1 are opened to disconnect the electrical connection of the farm converter 9 with the generator 40 and the grid 26. It should be noted that S410 is executed to ensure that the wind power converter is disconnected from the electric machine and the grid, and it can also be understood that the whole converter system 9 is not electrically connected to the grid and the generator during the full power test of the converter, so that the converter system becomes an independent testing device. And S420, short-circuiting the three-phase bus between the grid-side circuit breaker 1 and the grid-side filter 3. It should be noted that the short circuit of the three-phase bus provides a loop for the reactor current during the full power test of the grid side and the machine side, and after the short circuit of the three-phase bus, the original grid side reactor 3 in the converter can be regarded as a condition for testing the load grid side reactor 3' to provide the full power test of the power generation field converter 9. In step S430, a dc precharge device 11 is connected to the dc side capacitor 6 of the field converter 9. The dc precharge device 11 is different from the conventional precharge circuit 2 in that it does not need to operate by the electric power of the grid, and the dc precharge device 11 can operate independently of the grid voltage. The dc pre-charge device 11 includes at least one independent power source and is configured to independently charge the dc-side capacitor 6 and maintain the voltage across the dc-side capacitor 6 at a predetermined voltage value. Performing S440a and/or S440 b: s440a, disconnecting the machine side ac fuse 8 to disconnect the electrical connection of the machine side converter 7 to the grid side filter 3 and closing the grid side ac fuse 4 to perform a grid side full power test of the farm converter 9; s440b, the generator side of the generator-side ac fuse 8 is electrically connected to the grid-side filter 3, the grid-side ac fuse 4 is opened to disconnect the electrical connection between the grid-side converter 5 and the grid-side filter 3, and the generator-side ac fuse 8 is closed to perform the generator-side full-power test of the farm converter 9. The pre-charging device which is independent of the power supply of the power grid voltage and can work independently is provided on the basis of the existing converter; a three-phase bus short-circuit structure 10 between a converter breaker and the grid-side filter 3 is added to short-circuit three phases of a network-side port of an electric reactor of the grid-side filter 3, so that a loop is provided for electric reactor current in full-power tests of a network side and a machine side; a network side and machine side cable connection structure is added to connect the machine side converter 7 with a network side reactor through a cable in a field test, so that a current path is provided for the current of the machine side converter 7 to flow to a load network side reactor of the machine side converter 7 in a full-power test of the machine side converter 7; the ac fuse of disconnection machine side or net side, realize the full power test condition of net side or machine side, need not increase isolation transformer and machine side cabinet outer reactor and cutout etc. experiment is with low costs, thereby it is simple and consume man-hour few not have too much cable junction test procedure, simultaneously owing to need not additionally increase experimental facilities, still have the advantage of being convenient for remove transportation and site transformation, need not demolish all parts and cable after the test is finished in order to carry out the experiment next time, and then reduced work load. The method for detecting the full power of the converter does not depend on a power grid or input energy, gets rid of the restriction of the external environment of field work, and has wider adaptability. The test of the converter can be independent of the state of a power grid, has no impact on the power grid, and can repeatedly carry out power experiments on the converter for many times in a short time; similarly, the converter is started and stopped without depending on a generator system, so that the whole generator machinery and an electric control system are not required to be mobilized, the full-power test condition of the converter side and the network side is not required to be started without depending on the generator system, an additional experiment field is not required, and the detection space is saved.
According to one embodiment, the method may further comprise providing cable connection structures on the three-phase bus between the grid side circuit breaker 1 and the grid side filter 3, on the three-phase bus between the grid side filter 3 and the grid side ac fuse 4 and on the three-phase bus between the machine side circuit breaker 24 and the machine side ac fuse 8, respectively. In one example, the cable connection structure may be constituted by a cable mounting hole provided on a copper bar of the three-phase bus bar. In one example, S420 includes: and fixing the short circuit copper bar in the cable mounting hole in a bridging manner. In one example, during the full power test of the power plant converter 9, the short-circuit copper bars can be simultaneously fixed on the three-phase copper bars in a bridging manner to achieve the purpose of short circuit, and at this time, the cable connection structure is used as a three-phase bus short-circuit structure 10 for three-phase short-circuiting the reactor grid-side port of the grid-side ac filter 3, so as to provide a loop for testing the current of the load grid-side reactor 3' during the full power test of the grid side and the machine side. In one example, S440b includes: both ends of the cable 25 are connected to a cable mounting hole on the three-phase bus between the grid-side filter 3 and the grid-side ac fuse 4 and a cable mounting hole on the three-phase bus between the machine-side breaker 24 and the machine-side ac fuse 8, respectively. Here, the cable 25 is used to connect the machine-side converter 7 to the existing grid-side filter 3 that becomes the test load grid-side reactor 3 'due to a short circuit, so that a current path is provided for the current of the machine-side converter 7 to flow to the test load grid-side reactor 3' when the machine-side converter 7 is subjected to a full power test. In one example, a machine-side cable connection structure 28 is arranged on a connection line between the machine-side circuit breaker 24 and the machine-side ac fuse 8, a grid-side cable connection structure 29 is arranged on a connection line between the grid-side ac fuse 4 and the grid-side filter 3, and the machine-side cable connection structure 28 and the grid-side cable connection structure 29 are electrically connected. In one example, the method further includes that the network side ac fuse 4 and the machine side ac fuse 8 described above are optionally fuses with a manually removable function, facilitating field modification of the test circuit.
According to one embodiment, S430, the dc pre-charge device 11 may include an independent power source, a power supply side circuit and a rectification side circuit connected in series, the independent power source, the power supply side circuit and the rectification side circuit being connected in series in sequence, and the power supply side circuit and the rectification side circuit being coupled through a voltage transformation device. The power supply side circuit can comprise a power supply switch and a primary side of the transformation device which are connected in series, the rectification side circuit comprises a secondary side of the transformation device, a variable resistor and an AC-DC rectification device which are connected in series, and positive and negative outputs of the AC-DC rectification device are respectively connected to two ends of a direct current side capacitor 6. In one example, the independent power source, the power supply side circuit and the rectification side circuit may be exemplified by three-phase ac power supply, and a two-phase power supply independent power source and a corresponding power supply rectification circuit or a combination of a three-phase independent power source and other various corresponding power supply side circuits or rectification side circuits may also be used to realize the idea of the independent dc pre-charging device 11. For example, in the utility model patents of chinese patent application nos. CN201420836236.4 and CN201520070574.6, various embodiments of the dc precharge device 11 are provided, which can be used to implement the power supply side circuit and/or the rectifier side circuit in the independent dc precharge device 11 of the present embodiment with simple modifications.
Fig. 5 is a schematic circuit diagram of a wind power converter testing method in an embodiment of the present invention when performing a grid-side full power test. As shown in fig. 5, according to the wind power converter testing method, when the grid-side converter 5 is tested at full power, the machine-side converter 7 and the grid-side filter 3 can be electrically isolated and separated, the machine-side converter 7 is in an idle state, a testing circuit formed by the method comprises the direct-current side capacitor 6, the grid-side converter 5 and the testing load grid-side reactor 3 '(a part of the grid-side filter 3), the testing circuit is connected by a cable, one end of the testing load grid-side reactor 3' is connected with the grid-side converter 5, and the other end of the testing load grid-side reactor is in short circuit to form a current loop, so that the full-power testing condition of the grid-side converter 5.
Fig. 6 is a schematic circuit diagram of a wind power converter testing method when performing a machine-side full power test according to an embodiment of the present invention. According to the wind power converter testing method, when a machine side converter 7 is tested at full power, a grid side converter 5 is electrically isolated from a grid side alternating current filter 3, when the machine side is tested at full power, the grid side converter 5 is independent and is in a non-working state, a testing circuit formed by the method comprises a direct current side capacitor 6, the machine side converter 7 and a testing load grid side reactor 3 '(part of the grid side filter 3) which are connected through a cable, one end of the testing load grid side reactor 3' is connected with the machine side converter 7, and the other end of the testing load grid side reactor is in short circuit to form a current loop, so that the testing condition of the full power of the machine side converter 7 is met.
In the full-power test of the converter on the network side and the machine side, because the independent direct current pre-charging device 11 adopts an independent power supply device, the test of the converter can be independent of the state of a power grid, the power grid is not impacted, and the power experiment of the converter can be repeatedly carried out for many times in a short time; similarly, the starting and stopping of the converter are not dependent on the states of the wind driven generator system and the variable pitch system, so that the whole fan machinery and an electric control system do not need to be moved, and the condition of starting the converter does not need to be achieved by depending on the fan system. Therefore, the system and the method of the invention ensure that the full power test of the converter does not depend on the power grid or the wind speed, get rid of the restriction of the external environment of the field work and have wider adaptability.
The method for testing the full power of the converter of the power generation field according to the embodiment of the invention can also be applied to other kinds of energy power generation field scenes, and the method for testing the full power of the converter of the power generation field is similar to the steps when the converter is tested in the air pressure type energy power generation field, so that the method is not repeated for brevity.
In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that in the present embodiment, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some ports, devices or units, and may also be an electrical, mechanical or other form of connection.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A full-power test method for a power plant converter is characterized by comprising the following steps:
-disconnecting the generator side breaker (24) and the grid side breaker (1) to disconnect the electrical connection of the farm converter (9) to the generator (40) and the grid (26);
short-circuiting a three-phase bus between the network side circuit breaker (1) and the network side filter (3);
a direct current pre-charging device (11) is connected with a direct current side capacitor (6) of the power generation field converter (9);
the three-phase bus between the grid-side filter (3) and the grid-side alternating current fuse (4) and the three-phase bus between the machine-side circuit breaker (24) and the machine-side alternating current fuse (8) are short-circuited;
performing the following steps (a) and/or (b):
(a) disconnecting the machine-side ac fuse (8) to disconnect the electrical connection of the machine-side converter (7) to the grid-side filter (3) and closing the grid-side ac fuse (4) to perform a grid-side full-power test of the farm converter (9);
(b) and (3) electrically connecting the generator side of the generator side alternating current fuse (8) with the grid side filter (3), disconnecting the grid side alternating current fuse (4) to disconnect the electrical connection between the grid side converter (5) and the grid side filter (3), and closing the generator side alternating current fuse (8) to perform generator side full power test of the generator field converter (9).
2. The method according to claim 1, characterized in that the dc pre-charge device (11) comprises at least one independent power supply and is configured to be able to independently charge the dc-side capacitor (6) and maintain the voltage across the dc-side capacitor (6) at a predetermined voltage value.
3. Method according to claim 2, characterized in that the dc pre-charging device (11) comprises a series connection of an independent power supply, a supply side circuit and a rectifying side circuit, which are in turn connected in series, the supply side circuit and the rectifying side circuit being coupled by a transforming device.
4. The method of claim 3, wherein the supply side circuit comprises a supply switch and a primary side of a transformer device connected in series.
5. The method of claim 3 or 4, wherein the rectification side circuit comprises a secondary side of a transformation device, a variable resistor and a rectification device connected in series.
6. The method of claim 1, wherein the three-phase bus bars are shorted by a cable connection structure comprised of cable mounting holes disposed on copper bars of the three-phase bus bars.
7. Method according to claim 6, characterized in that the step of shorting the three-phase bus between the grid-side circuit breaker (1) and the grid-side filter (3) comprises: and fixing the short circuit copper bar in the cable mounting hole in a bridging manner.
8. The method according to claim 6, characterized in that the step of electrically connecting the generator side of the machine side ac fuse (8) with the grid side filter (3) comprises: connecting the two ends of a cable (25) in a cable mounting hole on a three-phase bus between the grid-side filter (3) and the grid-side AC fuse (4) and a cable mounting hole on a three-phase bus between the machine-side circuit breaker (24) and the machine-side AC fuse (8), respectively.
9. Method according to claim 1, characterized in that the network-side ac fuse (4) and the machine-side ac fuse (8) are fuses with manually removable functionality.
Priority Applications (1)
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| CN113507218A (en) * | 2021-08-17 | 2021-10-15 | 阳光电源股份有限公司 | Wind power converter, wind power system and IGBT fault testing method |
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