CN217655214U - High-voltage large-capacity power grid simulation device - Google Patents
High-voltage large-capacity power grid simulation device Download PDFInfo
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- CN217655214U CN217655214U CN202221162919.7U CN202221162919U CN217655214U CN 217655214 U CN217655214 U CN 217655214U CN 202221162919 U CN202221162919 U CN 202221162919U CN 217655214 U CN217655214 U CN 217655214U
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Abstract
The utility model discloses a high-voltage large-capacity power grid simulation device, which comprises a step-down transformer, a multi-level current smoothing unit, a chopping unit, a multi-level inversion unit and an output filtering unit; the inversion unit comprises n inverters; the alternating current output end of each inverter is respectively connected to the primary windings of the corresponding three-phase transformers; the in-phase secondary windings of the three-phase transformers are respectively connected in series; the high-voltage large-capacity power grid simulation device realizes the superposition of the output voltage of the inversion unit through the secondary side cascade of the output side three-phase transformer, greatly improves the equivalent switching frequency, and realizes the high-precision control of the output voltage, thereby simulating different power grid characteristics.
Description
Technical Field
The utility model relates to a equipment test technical field that is incorporated into the power networks especially relates to a electric wire netting analogue means of high pressure large capacity.
Background
With the continuous improvement of new energy power generation in an electric power system, the 'double-high' characteristic of a high-proportion new energy and high-proportion power electronic device is increasingly highlighted, and the grid-connected performance requirement of the electric power industry on new energy power generation equipment is increasingly high. Under the background, it is necessary to widely develop researches on interaction characteristics, closed-loop effects and impedance characteristics of the new energy power generation equipment and the power grid, and evaluate adaptability, support and stability of the new energy power generation equipment under various power grid access conditions.
Chinese utility model CN201510357695.3 discloses a by three-phase multiple winding transformer, the power module array, the three-phase electric wire netting disturbance generating device that output filter constitutes, the device can the output voltage deviation, frequency deviation, flicker, multiple electric wire netting disturbance characteristics such as voltage unbalance, the various disturbance characteristics of mainly used simulation electric wire netting, study new forms of energy power generation equipment's electric wire netting adaptability that is incorporated into the power networks, but the device's engineering design receives multiple winding transformer and power module array quantity restriction easily, unit device capacity generally is no longer than 10MVA, and is bulky, and can't measure towards future large-scale offshore wind generating set, the operating characteristic that is incorporated into the power networks of equipment such as large capacity SVG.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to cascade through the vice limit of output side three-phase transformer group and realize that inverter unit output voltage folds ripples, equivalent switching frequency is increased substantially, realize output voltage's high accuracy control, thereby simulate different electric wire netting characteristics, cascade the capacity that realizes a plurality of dc-to-ac converters through the vice limit of output side three-phase transformer group and add up, increase substantially device output capacity, cascade the improvement that realizes output voltage through the vice limit of output side three-phase transformer group, and reduce the withstand voltage level of the insulating of dc-to-ac converter in the device and ann rule distance to ground, make the device volume diminish, finally constitute high voltage, the electric wire netting analogue means of large capacity.
In order to solve the technical problem, the utility model provides a high-voltage large-capacity power grid simulation device, which comprises a step-down transformer, a multi-level current smoothing unit, a chopping unit, a multi-level inversion unit, an isolation unit and an output filtering unit;
the multi-level rectifying unit is connected with a power grid through a step-down transformer, and the multi-level inverting unit comprises n multi-level inverters; the isolation unit comprises n three-phase transformers; the output filtering unit comprises 3 groups of filtering capacitors; the alternating current output end of each multi-level inverter is respectively connected to the primary winding of the corresponding three-phase transformer; the A-phase secondary windings of the three-phase transformers are respectively connected in series to form two ends A and X, the B-phase secondary windings are respectively connected in series to form two ends B and Y, the C-phase secondary windings are respectively connected in series to form two ends C and Z, the three ends X, Y and Z are connected together to form a star connection, and the three ends A, B and C are used as the three-phase output end of the high-voltage high-capacity power grid simulation device after passing through the output filtering unit and are connected with the tested equipment;
wherein n is more than or equal to 3.
Preferably, the multi-level rectifying unit includes at least one multi-level rectifier, an ac side of the multi-level rectifier is connected to the step-down transformer, and a dc side of the multi-level rectifier is connected to a dc side of the multi-level inverting unit in parallel.
Preferably, the chopper unit comprises a power module and an energy consumption unit which are connected to the direct current side of the multi-level inverter unit, when the voltage of the direct current side rises and exceeds a protection fixed value, the power module is triggered to act, energy is released through the energy consumption unit, and the voltage of the direct current side is reduced.
Preferably, the high-voltage large-capacity power grid simulation device further comprises a controller, wherein the controller is in communication connection with the multi-level inverter unit and controls the multi-level inverter unit to output fundamental voltage and at least 2-25 th harmonic voltage.
Preferably, the three-phase transformer adopts a three-phase four-core column structure or a three-phase five-core column structure.
Preferably, the multi-level inverter is a three-phase multi-level inverter, the ac output end of each three-phase multi-level inverter is connected to one end of the three-phase primary winding of the corresponding three-phase transformer, and the other ends of the three-phase primary windings of the three-phase transformers are connected together.
Preferably, the multi-level inverters are multi-level H-bridge inverters, and the ac output end of each multi-level H-bridge inverter is connected to two ends of a primary winding of the corresponding three-phase transformer.
Preferably, the multi-level inverter unit adopts an NPC three-level bridge arm or an ANPC three-level bridge arm.
After the device is adopted, the high-voltage large-capacity power grid simulation device comprises a step-down transformer, a multi-level current unit, a chopping unit, a multi-level inversion unit, an isolation unit and an output filtering unit; the multi-level rectifying unit is connected with a power grid through a step-down transformer, and the multi-level inverting unit comprises n multi-level inverters; the isolation unit comprises n three-phase transformers; the output filtering unit comprises 3 groups of filtering capacitors; the alternating current output end of each multi-level inverter is respectively connected to the primary winding of the corresponding three-phase transformer; the A-phase secondary windings of the three-phase transformers are respectively connected in series to form two ends A and X, the B-phase secondary windings are respectively connected in series to form two ends B and Y, the C-phase secondary windings are respectively connected in series to form two ends C and Z, the three ends X, Y and Z are connected together to form a star connection, and the three ends A, B and C are used as the three-phase output end of the high-voltage high-capacity power grid simulation device after passing through the output filtering unit and are connected with the tested equipment; the high-voltage large-capacity power grid simulation device realizes the superposition of the output voltage of the inversion unit through the secondary side cascade of the output side three-phase transformer, greatly improves the equivalent switching frequency, and realizes the high-precision control of the output voltage, thereby simulating different power grid characteristics.
Drawings
Fig. 1 is a system configuration diagram of a first embodiment of the high-voltage large-capacity grid simulator of the present invention;
fig. 2 is a system configuration diagram of a second embodiment of the high-voltage large-capacity grid simulator of the present invention;
fig. 3 is a system configuration diagram of a third embodiment of the high-voltage large-capacity grid simulator of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Referring to fig. 1, fig. 1 is a system configuration diagram of a first embodiment of a high-voltage large-capacity grid simulator according to the present invention;
the embodiment discloses a high-voltage large-capacity power grid simulation device which is characterized by comprising a step-down transformer, a multi-level current smoothing unit, a chopping unit, a multi-level inversion unit, an isolation unit and an output filtering unit;
the multi-level rectifying unit is connected with a power grid through a step-down transformer, and the multi-level inverting unit comprises n multi-level inverters; the isolation unit comprises n three-phase transformers; the output filtering unit comprises 3 groups of filtering capacitors; the alternating current output end of each multi-level inverter is respectively connected to the primary winding of the corresponding three-phase transformer; the A-phase secondary side windings of the three-phase transformers are respectively connected in series to form two ends A and two ends X, the B-phase secondary side windings are respectively connected in series to form two ends B and two ends Y, the C-phase secondary side windings are respectively connected in series to form two ends C and two ends Z, the three ends X, Y and Z are connected together to form a star connection, and the three ends A, B and C are used as three-phase output ends of the high-voltage high-capacity power grid simulation device after passing through the output filtering unit and are connected with tested equipment;
wherein n is more than or equal to 3.
In this embodiment, the multi-level current unit includes at least one multi-level current transformer, an ac side of the multi-level current transformer is connected to the step-down transformer, and a dc side of the multi-level current transformer is connected to a dc side of the multi-level inverter unit in parallel; the chopper unit comprises a power module and an energy consumption unit which are connected to the direct current side of the multi-level inverter unit, when the voltage of the direct current side rises and exceeds a protection fixed value, the power module is triggered to act, energy is released through the energy consumption unit, and the voltage of the direct current side is reduced.
In this embodiment, the multilevel inverters are three-phase multilevel inverters, the ac output end of each three-phase multilevel inverter is connected to one end of a three-phase primary winding of the corresponding three-phase transformer, and the other ends of the three-phase primary windings of the three-phase transformers are connected together;
or the multi-level inverter is a multi-level H-bridge inverter, and the alternating current output end of each multi-level H-bridge inverter is respectively connected to two ends of a primary winding of the corresponding three-phase transformer.
Example two
Referring to fig. 2, fig. 2 is a system configuration diagram of a first embodiment of the high-voltage large-capacity grid simulator of the present invention;
the embodiment one discloses a 35kV high-voltage large-capacity power grid simulation device which comprises a step-down transformer, a multi-level current smoothing unit, a chopping unit, a multi-level inversion unit, an isolation unit and an output filtering unit;
the multi-level current-smoothing unit adopts a group of 3.3kV 15MVA three-level rectifiers, the alternating current side of each three-level rectifier is connected with a step-down transformer, and the direct current side of each three-level rectifier is connected with the direct current side of the multi-level inversion unit in parallel; the step-down transformer adopts a 35kV/3.3kV dry-type transformer; the multi-level inversion unit comprises a plurality of groups of 3.3kV 8MVA three-level inverters; the isolation unit comprises a plurality of three-phase transformers; the output filtering unit comprises three groups of filtering capacitors;
the three-phase alternating current output end of each 3.3kV 8MVA three-level inverter is respectively connected to one end of the primary winding of the corresponding three-phase transformer, and the other ends of the primary windings of the three-phase transformers are connected together; the A-phase secondary windings of the three-phase transformers are connected in series to form two ends A and two ends X, the B-phase secondary windings are connected in series to form two ends B and two ends Y, the C-phase secondary windings are connected in series to form two ends C and two ends Z, the three ends X, Y and Z are connected together to form a star connection, and the three ends A, B and C are used as the 35kV three-phase output end of the high-voltage high-capacity power grid simulation device after passing through the output filtering unit and are connected with tested equipment.
In this embodiment, the high-voltage large-capacity power grid simulation device further includes a controller, and the controller is in communication connection with the multi-level inverter unit and controls the multi-level inverter unit to output fundamental voltage and at least include 2-25 th harmonic voltage.
The three-phase transformer adopts a three-phase four-core column structure or a three-phase five-core column structure.
EXAMPLE III
Referring to fig. 3, fig. 3 is a system configuration diagram of a first embodiment of the high-voltage large-capacity grid simulator of the present invention;
the second embodiment discloses a 35kV high-voltage large-capacity power grid simulation device which comprises a step-down transformer, a multi-level current unit, a chopping unit, a multi-level inversion unit, an isolation unit and an output filtering unit;
the multi-level current-smoothing unit adopts a group of 3.3kV 15MVA three-level rectifiers, the alternating current side of each three-level rectifier is connected with a step-down transformer, and the direct current side of each three-level rectifier is connected with the direct current side of the multi-level inversion unit in parallel; the step-down transformer adopts a 35kV/3.3kV dry-type transformer; the multi-level inverter unit comprises a plurality of groups of 3.3kV 6MVA three-level H-bridge inverters; the isolation unit comprises a plurality of three-phase transformers; the output filtering unit comprises 3 groups of filtering capacitors;
two alternating current output ends of each 3.3kV 6MVA three-level H bridge inverter are respectively connected to one primary winding of the three-phase transformer, A-phase secondary windings of each three-phase transformer are respectively connected in series to form an A end and an X end, B-phase secondary windings are respectively connected in series to form a B end and a Y end, C-phase secondary windings are respectively connected in series to form a C end and a Z end, the X end, the Y end and the Z end are connected together to form a star connection, and the A end, the B end and the C end are used as a 35kV three-phase output end of the high-voltage large-capacity power grid simulation device after passing through the output filtering unit and are connected with a tested device.
In this embodiment, the high-voltage large-capacity power grid simulation device further includes a controller, and the controller is in communication connection with the multi-level inverter unit and controls the multi-level inverter unit to output fundamental voltage and at least include 2-25 th harmonic voltage.
The three-phase transformer adopts a three-phase four-core column structure or a three-phase five-core column structure.
Claims (8)
1. A high-voltage large-capacity power grid simulation device is characterized by comprising a step-down transformer, a multi-level current smoothing unit, a chopping unit, a multi-level inversion unit, an isolation unit and an output filtering unit;
the multi-level rectifying unit is connected with a power grid through a step-down transformer, and the multi-level inverting unit comprises n multi-level inverters; the isolation unit comprises n three-phase transformers; the output filtering unit comprises 3 groups of filtering capacitors; the alternating current output end of each multi-level inverter is respectively connected to the primary winding of the corresponding three-phase transformer; the A-phase secondary windings of the three-phase transformers are respectively connected in series to form two ends A and X, the B-phase secondary windings are respectively connected in series to form two ends B and Y, the C-phase secondary windings are respectively connected in series to form two ends C and Z, the three ends X, Y and Z are connected together to form a star connection, and the three ends A, B and C are used as the three-phase output end of the high-voltage high-capacity power grid simulation device after passing through the output filtering unit and are connected with the tested equipment;
wherein n is more than or equal to 3.
2. The high-voltage large-capacity power grid simulation device according to claim 1, wherein the multi-level rectification unit comprises at least one multi-level current transformer, the alternating current side of the multi-level current transformer is connected with the step-down transformer, and the direct current side of the multi-level current transformer is connected with the direct current side of the multi-level inversion unit in parallel.
3. The high-voltage large-capacity power grid simulation device according to claim 1, wherein the chopper unit comprises a power module and an energy consumption unit which are connected to the direct current side of the multi-level inverter unit, when the voltage of the direct current side rises and exceeds a protection fixed value, the power module is triggered to act, and the energy consumption unit releases energy to reduce the voltage of the direct current side.
4. The high-voltage large-capacity power grid simulation device according to claim 1, further comprising a controller, wherein the controller is in communication connection with the multi-level inverter unit and controls the multi-level inverter unit to output fundamental voltage and at least 2-25 harmonic voltage.
5. The high-voltage large-capacity power grid simulation device according to claim 1, wherein the three-phase transformer adopts a three-phase four-core column structure or a three-phase five-core column structure.
6. The high-voltage large-capacity power grid simulation device according to claim 2, wherein the multi-level inverters are three-phase multi-level inverters, the ac output end of each three-phase multi-level inverter is connected to one end of the three-phase primary winding of the corresponding three-phase transformer, and the other ends of the three-phase primary windings of the three-phase transformers are connected together.
7. The high-voltage large-capacity power grid simulation device according to claim 2, wherein the multi-level inverters are multi-level H-bridge inverters, and the ac output terminal of each multi-level H-bridge inverter is connected to two terminals of a primary winding of the corresponding three-phase transformer.
8. The high-voltage large-capacity power grid simulation device according to claim 5 or 6, wherein the multi-level inverter unit adopts an NPC three-level bridge arm or an ANPC three-level bridge arm.
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| CN202221162919.7U CN217655214U (en) | 2022-05-13 | 2022-05-13 | High-voltage large-capacity power grid simulation device |
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| CN202221162919.7U CN217655214U (en) | 2022-05-13 | 2022-05-13 | High-voltage large-capacity power grid simulation device |
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