CN216956208U - Three-phase power grid simulation device - Google Patents
Three-phase power grid simulation device Download PDFInfo
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- CN216956208U CN216956208U CN202220025767.XU CN202220025767U CN216956208U CN 216956208 U CN216956208 U CN 216956208U CN 202220025767 U CN202220025767 U CN 202220025767U CN 216956208 U CN216956208 U CN 216956208U
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Abstract
The utility model discloses a three-phase power grid simulation device, wherein the three-phase power grid simulation device comprises: the multi-winding transformer comprises N power module arrays, each power module array comprises a first power module, a second power module and a third power module, the three-phase input end of each of the first power module, the second power module and the third power module is respectively connected with one secondary side three-phase winding, and the first power module, the second power module and the third power module are used for outputting voltage with fundamental voltage components or fundamental plus low-frequency harmonic voltage components; and the three-phase output end of the fourth power module is respectively connected with the negative electrode output ends of the first, second and third power modules of the Nth power module array in the N power module arrays in a one-to-one correspondence manner, and the fourth power module is used for outputting voltage with high-frequency harmonic components. The technical scheme of the utility model can solve the problem of being not beneficial to mobile vehicle-mounted field detection.
Description
Technical Field
The utility model relates to the technical field of power grid adaptability detection, in particular to a three-phase power grid simulation device.
Background
At present, before grid-connected operation is carried out on electrical equipment such as wind power generation, photovoltaic power generation and energy storage, the electrical equipment is required to carry out power grid adaptability test so as to ensure that the operating characteristics of the electrical equipment can meet the requirements of a power grid, but the existing three-phase power grid simulation device needs to carry two sets of test devices, namely a low-frequency voltage disturbance generation device and a high-frequency voltage disturbance generation device, so that the self weight and the occupied volume are large, and the three-phase power grid simulation device is not beneficial to mobile vehicle-mounted field detection.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a three-phase power grid simulation device, aiming at solving the problem that the three-phase power grid simulation device is not beneficial to mobile vehicle-mounted field detection.
In order to achieve the above object, the present invention provides a three-phase power grid simulation apparatus, including:
the primary side three-phase winding of the multi-winding transformer is used for being connected with a power grid, and the multi-winding transformer is provided with a plurality of secondary side three-phase windings;
the power module comprises N power module arrays, each power module array comprises a first power module, a second power module and a third power module, three-phase input ends of each first power module, each second power module and each third power module are respectively connected with one secondary three-phase winding, wherein N is a positive integer not less than 1, and the first power module, the second power module and the third power module are used for outputting a voltage with a fundamental voltage component or a fundamental plus low-frequency harmonic voltage component; and the number of the first and second groups,
and the three-phase output end of the fourth power module is respectively connected with the negative electrode output ends of the first power module, the second power module and the third power module of the Nth power module array in the N power module arrays in a one-to-one correspondence manner, and the fourth power module is used for outputting voltage with high-frequency harmonic components.
Optionally, N power module arrays are cascaded, an output end of a first power module in each power module array is correspondingly cascaded, an output end of a second power module in each power module array is correspondingly cascaded, an output end of a third power module in each power module array is correspondingly cascaded, and positive output ends of the first power module, the second power module and the third power module of a first power module array in the N power module arrays are used for being respectively connected with a three-phase input end of an electrical device.
Optionally, the three-phase input end of the fourth power module is connected to one of the secondary three-phase windings.
Optionally, the three-phase grid simulation apparatus further includes:
the first filter circuit is arranged between the input end of the first power module and the corresponding secondary three-phase winding;
and/or the secondary side three-phase winding is arranged between the input end of the second power module and the corresponding secondary side three-phase winding;
and/or the three-phase winding is arranged between the input end of the third power module and the corresponding secondary side three-phase winding;
and/or the power module is arranged between the input end of the fourth power module and the corresponding secondary three-phase winding.
Optionally, the three-phase grid simulation apparatus further includes:
and the three-phase input end of the second filter circuit is respectively connected with the positive output ends of the first power module, the second power module and the third power module in the first power module array in a one-to-one correspondence manner, and the three-phase output end of the second filter circuit is used for being connected with the three-phase input end of the electrical equipment in a one-to-one correspondence manner.
Optionally, the three-phase grid simulation apparatus further includes:
and the three-phase input end of the first isolation transformer is respectively connected with the three-phase output end of the second filter circuit in a one-to-one correspondence manner, and the three-phase output end of the isolation transformer is used for being connected with the three-phase input end of the electrical equipment in a one-to-one correspondence manner.
Optionally, the three-phase grid simulation apparatus further includes:
and the three-phase input end of the second isolation transformer is respectively connected with the positive output ends of the first power module, the second power module and the third power module in the first power module array in a one-to-one correspondence manner, and the three-phase output end of the second isolation transformer is used for being connected with the three-phase input end of the electrical equipment in a one-to-one correspondence manner.
Optionally, the primary three-phase windings of the multi-winding transformer are connected in a star connection or a delta connection, and each secondary three-phase winding is connected in a star connection, a delta connection or a phase-shifting delta connection.
Optionally, the fourth power module comprises a bus capacitor;
a discharge load; and the number of the first and second groups,
and the discharge switch circuit is connected with the discharge load circuit and is used for connecting the discharge load in parallel at two ends of the bus capacitor when the discharge switch circuit is conducted.
Optionally, the three-phase grid simulation apparatus further includes:
the main controller is in communication connection with each of the first power module, the second power module, the third power module and the fourth power module.
According to the technical scheme, a multi-winding transformer, N power module arrays and a fourth module array are adopted to form a three-phase power grid simulation device, output ends of a first power module, a second power module and a third power module in each power module array in the N power module arrays are correspondingly cascaded, so that positive output ends of a first power module, a second power module and a third power module in the first power module array in the N power module arrays can output voltage with fundamental wave voltage components or fundamental wave plus low-frequency harmonic wave voltage components to electrical equipment, and the fourth power module can output voltage with high-frequency harmonic wave components to the electrical equipment. The three-phase power grid simulation device integrates the low-frequency voltage disturbance generation device and the high-frequency voltage disturbance generation device, so that the three-phase power grid simulation device has two functions of simulating voltage disturbance and high-frequency voltage disturbance, can greatly reduce the volume and the weight compared with two separate testing devices, is more convenient to carry on a vehicle, and solves the problem of being not beneficial to mobile vehicle-mounted field detection.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a three-phase grid simulation apparatus according to the present invention;
fig. 2 is a schematic structural diagram of another embodiment of the three-phase grid simulation apparatus according to the present invention;
FIG. 3 is a schematic structural diagram of a three-phase grid simulation apparatus according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a three-phase grid simulation apparatus according to another embodiment of the present invention;
fig. 5 is a schematic circuit diagram of the first or second filter circuit in an embodiment of the vehicle-mounted power grid detection apparatus according to the present invention;
fig. 6 is a schematic diagram of a connection mode of a multi-winding transformer in an embodiment of the vehicle-mounted power grid detection device according to the present invention;
fig. 7 is a schematic circuit diagram of the first, second or third power module in an embodiment of the vehicle-mounted power grid detection apparatus of the present invention;
fig. 8 is a schematic circuit diagram of the first, second or third power module in an embodiment of the vehicle-mounted power grid detection apparatus of the present invention;
fig. 9 is a schematic circuit diagram of a fourth power module in an embodiment of the vehicle-mounted power grid detection apparatus according to the present invention;
fig. 10 is a schematic circuit diagram of a fourth power module in an embodiment of the vehicle-mounted power grid detection apparatus according to the present invention;
fig. 11 is a schematic circuit structure diagram of a discharge switch circuit and a discharge load in an embodiment of the vehicle-mounted power grid detection device according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name(s) | |
| 10 | |
60 | |
|
| 20 | |
70 | |
|
| 21 | |
80 | |
|
| 22 | |
90 | |
|
| 23 | Third power module | C | Capacitor with a |
|
| 30 | Fourth power | L | Inductance | |
| 40 | First filter circuit | | Bus capacitor | |
| 50 | Second filter circuit |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a three-phase power grid simulation device.
Existing grid suitability tests include, but are not limited to: voltage adaptability test, frequency adaptability test, higher harmonic adaptability test, inter-harmonic adaptability test, three-phase imbalance adaptability test and the like. The harmonic adaptability test requires that the three-phase power grid simulation device has the capability of outputting 2-25 times of harmonic, and in order to ensure the accuracy of the output harmonic, the conventional three-phase power grid simulation device is generally composed of two separate test devices, namely a low-frequency voltage disturbance generation device and a high-frequency voltage disturbance generation device, so that the three-phase power grid simulation device is large in size, heavy in overall weight and not beneficial to vehicle-loading.
Referring to fig. 1 to 4, in an embodiment, the three-phase grid simulation apparatus includes:
the multi-winding transformer 10 comprises a multi-winding transformer 10, wherein a primary side three-phase winding of the multi-winding transformer 10 is used for being connected with a power grid, and the multi-winding transformer 10 is provided with a plurality of secondary side three-phase windings;
each of the N power module arrays 20 includes a first power module 21, a second power module 22, and a third power module 23, and input ends of each of the first power module 21, the second power module 22, and the third power module 23 are respectively connected to one of the secondary three-phase windings; wherein N is a positive integer not less than 1, the first power module 21, the second power module 22, and the third power module 23 are configured to output a voltage having a fundamental voltage component or a fundamental plus harmonic voltage component; and the number of the first and second groups,
and a third power module 30, a three-phase output end of the third power module 30 is respectively connected with the negative output ends of the first power module 21, the second power module 22 and the third power module of the nth power module array 20 in the N power module arrays 20 in a one-to-one correspondence manner, and the third power module 30 is configured to output a voltage with a harmonic component.
In this embodiment, the multi-winding transformer 10 may have a plurality of primary three-phase windings and a plurality of secondary three-phase windings. The primary side three-phase winding can be connected with a power grid so as to access three-phase alternating current of the power grid, and corresponding three-phase alternating current can be induced and generated on each secondary side three-phase winding through the turn ratio of each phase winding coil in each primary side three-phase winding to the corresponding phase winding coil in each secondary side three-phase winding and then output. In this embodiment, the three phases are a U phase, a V phase, and a W phase, respectively.
The first power module 21, the second power module 22, and the third power module 23 may all be implemented by a two-level, four-quadrant, two-level, or three-level frequency conversion topology, where the frequency conversion topology may include a three-phase AC-DC converter, an intermediate bus capacitor link, and a single-phase DC-AC converter, which are connected in sequence, where the number of levels that the single-phase DC-AC converter can output determines its own type and the type of the frequency conversion topology, for example, the single-phase DC-AC converter may output three levels, namely a positive level, a zero level, and a negative level, and the single-phase DC-AC converter is a two-level converter, and the frequency conversion topology where the single-phase DC-AC converter is a two-level frequency conversion topology. In this embodiment, a first power module 21, a second power module 22, and a third power module 23 form a power module array, in other words, the number of the secondary three-phase windings is 3N. The input ends of the first power module 21, the second power module 22 and the third power module 23 in each power module alignment can be connected with a phase of alternating current through a secondary three-phase winding, and are rectified into direct current by an AD-DC converter, and then the direct current is output to a single-phase DC-AC converter through an intermediate bus capacitor link, and finally the alternating current is output after being inverted into alternating current by the single-phase DC-AC converter.
In this embodiment, the output ends of the first power module 21, the second power module 22, and the third power module 23 in the N power module arrays 20 are correspondingly cascaded and can be cascade-connected, specifically: the output ends of the first power module 21, the second power module 22 and the third power module 23 are respectively and correspondingly cascaded, and the positive output ends of the first power module 21, the second power module 22 and the third power module of the first power module array 20 in the N power module arrays 20 are respectively connected with the three-phase input end of the electrical equipment. Here, the cascade mode of the present application will be explained by taking the first power module 21 in each power module array 20 as an example: the first power module 21 may include a positive output terminal and a negative output terminal, and among the N power module arrays 20, the positive output terminal of the first power module 21 of the first power module array 20 may be a U-phase output terminal of a three-phase power grid analog output device, the negative output terminal of the first power module may be connected to the positive output terminal of the first power module 21 of the second power module array 20, the negative output terminal of the first power module 21 of the second power module array 20 may be connected to the positive output terminal of the first power module 21 of the third power module array 20, by analogy, the negative output end of the first power module 21 in the nth-1 power module array 20 may be connected to the positive output end of the first power module 21 in the nth power module array 20, so as to implement the corresponding cascade connection of the output ends of the first power modules 21. It can be understood that the positive output end of the second power module 22 of the first power module array 20 may be a V-phase output end of the three-phase power grid analog output device, the positive output end of the second power module 22 of the first power module array 20 may be a W-phase output end of the three-phase power grid analog output device, and the output end of each second power module 22 and the output end of each third power module 23 correspond to a cascade connection manner, which may refer to the cascade connection manner of each first power module 21, and details are not described here. Each of the first power modules 21, each of the second power modules 22, and each of the third power modules 23 may output a three-phase ac voltage having only a fundamental voltage component or both a fundamental voltage component and a low-frequency harmonic component to the rear-end electrical equipment under the control of the main controller, so as to implement the function of the low-frequency voltage disturbance generating device.
The fourth power module 30 may be implemented using a two-quadrant, four-quadrant, two-level, three-level, or five-level frequency conversion topology. The fourth power module 30 may also include a three-phase AC-DC converter, a middle bus capacitor link, and a three-phase DC-AC converter, which are connected in sequence, and a three-phase output terminal of the three-phase DC-AC converter may be a three-phase output terminal of the fourth power module 30. The three-phase input end of the fourth power module 30 may be the three-phase input end of a three-phase AC-DC converter therein, and may also be connected to the three-phase output end of a secondary three-phase winding in a one-to-one correspondence manner, in other words, the number of the secondary three-phase windings is 3N +1 at this time, so that the fourth power module 30 may provide the front-end power input for the intermediate bus capacitor link through its own three-phase AC-DC converter under the control of the main controller, or may cancel the three-phase AC-DC converter, and perform voltage stabilization for the intermediate bus capacitor link through the three-phase DC-AC converter under the control of the main controller. The fourth power module 30 may output a high frequency harmonic voltage so as to implement the function of the high frequency voltage disturbance generating device. In addition, the fourth power module 30 may also output all harmonic voltages under the control of the main controller. The bus voltage of the fourth power module 30 is low, so that the IGBT with low withstand voltage can be selected, and the switching frequency of the IGBT is improved, so that the waveform quality and the precision of the harmonic voltage meet the national standard requirements. In this embodiment, the frequency of the low frequency harmonic voltage may be 2 to 7 times of the fundamental voltage, and the frequency of the high frequency harmonic voltage may be 8 to 25 times of the fundamental voltage.
In this embodiment, various circuit topology structures of the first power module 21, the second power module 22, and the third power module 23 are provided, and specific reference may be made to (a), (B), (C), (D), (E), (F), (G), (H), (I), (J), and (K) in fig. 7 and 8, which are not described herein. In this embodiment, various circuit topologies of the fourth power module 30 are proposed, and specifically refer to (a), (B), (C), (D), (E), (F), (G), (H), (I), (J), (K), and (L) in fig. 9 and fig. 10, which are not repeated herein.
Therefore, the technical scheme integrates the low-frequency voltage disturbance generating device and the high-frequency voltage disturbance generating device, so that the device has two functions of simulating voltage disturbance and high-frequency voltage disturbance, can greatly reduce the volume and the weight compared with two separate testing devices, and is more convenient for vehicle-mounted, thereby solving the problem that the device is not beneficial to mobile vehicle-mounted field detection.
Referring to fig. 7 to 10, in an embodiment, the three-phase grid simulation apparatus further includes:
the first filter circuit 40 is arranged between the input end of the first power module 21 and the corresponding secondary three-phase winding;
and/or, the secondary side three-phase winding is arranged between the input end of the second power module 22 and the corresponding secondary side three-phase winding;
and/or, the secondary side three-phase winding is arranged between the input end of the third power module 23 and the corresponding secondary side three-phase winding;
and/or the input end of the fourth power module 30 is arranged between the input end of the fourth power module and the corresponding secondary three-phase winding.
The first power module 21, the second power module 22 and the third power module 23 can also be connected with the corresponding secondary three-phase winding through a filter circuit, so that the three-phase alternating current output by the secondary three-phase winding can be filtered to remove harmonic components and then output to the corresponding power module, and the improvement of the purity of the three-phase alternating current accessed by each power module is facilitated.
Referring to fig. 3, in an embodiment, the three-phase grid simulation apparatus further includes:
and the three-phase input ends of the second filter circuit 50 are respectively connected with the positive output ends of the first power module 21, the second power module 22 and the third power module in the first power module array 20 in a one-to-one correspondence manner, and the three-phase output ends of the second filter circuit 50 are used for being connected with the three-phase input ends of the electrical equipment in a one-to-one correspondence manner.
The positive output terminals of the first power module 21, the second power module 22 and the third power module 23 in the first power module array 20 may also be connected to the three-phase input terminal of the electrical device through the filter circuit.
In this embodiment, the first filter circuit 40 and the second filter circuit 50 can both be implemented by using the same filter circuit structure, and this implementation provides circuit structures of three filter circuits, specifically, as shown in fig. 5, U1, V1, and W1 in fig. 5 are used to be connected to positive output terminals of the first, second, and third power modules 23 in the first power module array 20, respectively, and U2, V2, and W2 are used to be connected to three-phase input terminals of the electrical device. The first (A) is: comprises three inductors; the second (B) is: the three-phase three-four-phase three-; the third (C) is: the three-phase inductor comprises three capacitors and three inductors which are connected in sequence in a delta connection mode.
Further, the three-phase power grid simulation device further comprises:
and three-phase input ends of the first isolation transformer 60 are respectively connected with three-phase output ends of the second filter circuit 50 in a one-to-one correspondence manner, and three-phase output ends of the first isolation transformer 60 are used for being connected with three-phase input ends of electrical equipment in a one-to-one correspondence manner.
Compared with the autotransformer, the primary side and the secondary side of the isolation transformer are in electromagnetic connection and are in non-electrical connection, so that the isolation transformer has an electrical isolation effect. In this embodiment, the first isolation transformer 60 may be a three-phase isolation transformer, and may be a step-up transformer or a step-down transformer, which is not limited herein. The first isolation transformer 60 is configured to output the three-phase alternating current filtered by the second filter circuit 50 to the electrical device after electrical isolation and corresponding voltage increase/decrease. Due to the arrangement, the three-phase power grid simulation device and the electrical equipment are arranged in a non-common ground manner, and mutual interference caused by common ground arrangement can be effectively avoided.
Referring to fig. 4, in an embodiment, the three-phase grid simulation apparatus further includes:
and a second isolation transformer 70, three-phase input ends of the second isolation transformer 70 are respectively connected with positive output ends of the first power module 21, the second power module 22 and the third power module in the first power module array 20 in a one-to-one correspondence manner, and three-phase output ends of the second isolation transformer 70 are used for being connected with three-phase input ends of electrical equipment in a one-to-one correspondence manner.
In this embodiment, the positive output terminals of the first power module 21, the second power module 22 and the third power module 23 in the first power module array 20 may also be directly connected to the electrical device through the second isolation transformer 70 without passing through the second filter circuit 50. In this embodiment, the implementation of the second isolation transformer 70 can refer to the first isolation transformer 60, which is not described herein.
Referring to fig. 5, in an embodiment, the primary three-phase windings of the multi-winding transformer 10 are star-connected or delta-connected, and the three-phase windings of each secondary side are star-connected, delta-connected or phase-shifted delta-connected.
The primary three-phase winding may be star-connected or delta-connected, and specifically, referring to fig. 6, the primary three-phase windings in (a), (B), and (C) in fig. 6 are star-connected, and the primary three-phase windings in (D), (E), and (F) are delta-connected, which are not described herein again. Each secondary three-phase winding is star-connected, delta-connected, or phase-shifted delta-connected, and specifically, referring to fig. 6, in fig. 6, (a) and (D) each secondary three-phase winding is star-connected, (B) and (E) each secondary three-phase winding is delta-connected, and (C) and (F) each secondary three-phase winding is phase-shifted delta-connected, which is not described herein again. It should be noted that the connections of all secondary three-phase windings need to be the same.
Referring to fig. 11, in one embodiment, the fourth power module 30 includes a bus capacitor C1;
a discharge load 80; and the number of the first and second groups,
and a discharge switch circuit 90 electrically connected to the discharge load 80, wherein the discharge switch circuit 90 is configured to connect the discharge load 80 in parallel to both ends of the bus capacitor C1 when the switch circuit is turned on.
In this embodiment, the bus capacitor C1 is the middle bus capacitor C1 of the fourth power module 30, and can be connected between the positive and negative voltage buses; the discharge load 80 may be a discharge resistor; the discharge switch circuit 90 may be one or more of a transistor, a MOS transistor, an IGBT, or a relay.
The controlled terminal of the discharge switch circuit 90 may be connected to the main controller, one of the first terminal and the second terminal of the discharge switch circuit 90 may be connected to the first terminal of the discharge load 80, the other may be connected to the first terminal of the bus capacitor C1, and the second terminal of the discharge load 80 may be connected to the second terminal of the bus capacitor C1. The discharge switch circuit 90 may be turned on/off under the control of the main controller and may, when turned on, effect a parallel connection of the discharge load 80 and the bus capacitor C1. In this way, the main controller may control the discharging switch circuit 90 to be turned on to enable the pumped bus voltage to be consumed by the discharging load 80 when detecting that the bus voltage of the fourth power module 30 is pumped, so as to prevent the excessive bus voltage from breaking down the power switch in the fourth power module 30.
Referring to fig. 1 to 11, in an embodiment, the three-phase grid simulation apparatus further includes:
a main controller (not shown) communicatively coupled to each of the first power module 21, each of the second power module 22, each of the third power module 23, and the fourth power module 30.
The main controller can be realized by adopting microprocessors such as an MCU (microprogrammed control unit), a DSP (digital signal processor) or an FPGA (field programmable gate array), or can also be realized by adopting a special main control chip. The main controller can be provided with a plurality of control ports, each control port can be connected with the controlled end of one power switch in each power module, and the main controller can output corresponding switch driving signals to the corresponding power switches by operating a pre-integrated hardware circuit and a software program or algorithm so as to realize the simulation function of the three-phase power grid simulation device on power grid disturbance by controlling the conduction time and the time sequence of the corresponding power switches in each power module. The switch driving signal may be a PWM signal having a corresponding duty ratio and period.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A three-phase grid simulating assembly, the three-phase grid simulating assembly comprising:
the primary side three-phase winding of the multi-winding transformer is used for being connected with a power grid, and the multi-winding transformer is provided with a plurality of secondary side three-phase windings;
the power module comprises N power module arrays, each power module array comprises a first power module, a second power module and a third power module, three-phase input ends of each first power module, each second power module and each third power module are respectively connected with one secondary three-phase winding, wherein N is a positive integer not less than 1, and the first power module, the second power module and the third power module are used for outputting a voltage with a fundamental voltage component or a fundamental plus low-frequency harmonic voltage component; and (c) a second step of,
and the three-phase output end of the fourth power module is respectively connected with the negative electrode output ends of the first power module, the second power module and the third power module of the Nth power module array in the N power module arrays in a one-to-one correspondence manner, and the fourth power module is used for outputting voltage with high-frequency harmonic components.
2. The three-phase power grid simulation apparatus according to claim 1, wherein the output terminal of the first power module in each of the power module arrays is correspondingly cascaded, the output terminal of the second power module in each of the power module arrays is correspondingly cascaded, the output terminal of the third power module in each of the power module arrays is correspondingly cascaded, and positive output terminals of the first power module, the second power module, and the third power module in the first power module array of the N power module arrays are respectively connected to a three-phase input terminal of an electrical device.
3. A three-phase grid simulation apparatus according to claim 1, wherein the three-phase input of the fourth power module is connected to a secondary three-phase winding.
4. The three-phase grid simulating assembly of claim 1 wherein said three-phase grid simulating assembly further comprises:
the first filter circuit is arranged between the input end of the first power module and the corresponding secondary three-phase winding;
and/or the secondary side three-phase winding is arranged between the input end of the second power module and the corresponding secondary side three-phase winding;
and/or the three-phase winding is arranged between the input end of the third power module and the corresponding secondary side three-phase winding;
and/or the power module is arranged between the input end of the fourth power module and the corresponding secondary three-phase winding.
5. The three-phase grid simulating assembly of claim 1 wherein said three-phase grid simulating assembly further comprises:
and the three-phase input end of the second filter circuit is respectively connected with the positive output ends of the first power module, the second power module and the third power module in the first power module array in a one-to-one correspondence manner, and the three-phase output end of the second filter circuit is used for being connected with the three-phase input end of the electrical equipment in a one-to-one correspondence manner.
6. The three-phase grid simulating assembly according to claim 5 wherein said three-phase grid simulating assembly further comprises:
and the three-phase input end of the first isolation transformer is respectively connected with the three-phase output end of the second filter circuit in a one-to-one correspondence manner, and the three-phase output end of the isolation transformer is used for being connected with the three-phase input end of the electrical equipment in a one-to-one correspondence manner.
7. A three-phase grid simulation apparatus according to claim 1, further comprising:
and the three-phase input end of the second isolation transformer is respectively connected with the positive electrode output ends of the first power module, the second power module and the third power module in the first power module array in a one-to-one correspondence manner, and the three-phase output end of the second isolation transformer is used for being connected with the three-phase input end of the electrical equipment in a one-to-one correspondence manner.
8. A three-phase network simulator as claimed in claim 1, wherein the primary three-phase windings of the multi-winding transformer are wye-connected or delta-connected and the respective three-phase windings of each secondary are wye-connected, delta-connected or phase-shifted delta-connected.
9. The three-phase grid simulating assembly according to claim 1 wherein said fourth power module includes a bus capacitor;
a discharge load; and the number of the first and second groups,
and the discharge switch circuit is connected with the discharge load circuit and is used for connecting the discharge load in parallel at two ends of the bus capacitor when the discharge switch circuit is conducted.
10. A three-phase grid simulating assembly according to any one of claims 1 to 9 wherein the three-phase grid simulating assembly further includes:
the main controller is in communication connection with each of the first power module, the second power module, the third power module and the fourth power module.
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