CN220671537U - Broadband impedance characteristic measuring device and system - Google Patents
Broadband impedance characteristic measuring device and system Download PDFInfo
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- CN220671537U CN220671537U CN202322042136.6U CN202322042136U CN220671537U CN 220671537 U CN220671537 U CN 220671537U CN 202322042136 U CN202322042136 U CN 202322042136U CN 220671537 U CN220671537 U CN 220671537U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model discloses a broadband impedance characteristic measuring device and a broadband impedance characteristic measuring system, wherein the device comprises a rectifying unit, a chopping unit, an isolating unit, an inversion unit and an output filtering unit; the isolation unit comprises n isolation type DC/DC converters, and the inversion unit comprises n H-bridge inverters; the output filter unit comprises three groups of LC filters; the rectification unit comprises one or more rectifiers, the alternating current side of each rectifier is connected with an alternating current power supply, and the direct current side of each rectifier is connected with the direct current input end of each isolated DC/DC converter in parallel; the direct current output ends of the isolated DC/DC converters are respectively and correspondingly connected with the direct current side of an H-bridge inverter; the device is provided with a single rectifier, a plurality of paths of direct current power supplies are provided by arranging the isolation unit on the direct current side, the inverter unit can output cascade overlapping waves without a multi-winding transformer, the broadband impedance characteristic of a grid-connected equipment port is accurately measured, the equivalent switching frequency is improved, the circuit is simpler, and the device volume is smaller.
Description
Technical Field
The utility model relates to the technical field of grid-connected equipment testing, in particular to a broadband impedance characteristic measuring device and a broadband impedance characteristic measuring system.
Background
With the continuous improvement of the duty ratio of the new energy power generation system in the power grid, the double-high characteristics of the high-proportion new energy and the high-proportion power electronic device are increasingly prominent, and the grid-connected performance requirements of the power industry on the new energy power generation equipment are increasingly high. Under the background, the research of the interaction characteristic, the closed-loop effect and the impedance characteristic between the new energy power generation equipment and the power grid needs to be widely carried out, and the adaptability, the supportability and the stability of the new energy power generation equipment under various power grid access conditions are comprehensively evaluated.
The broadband impedance characteristic measuring device in the prior art realizes multipath isolation of a direct current power supply through a multi-winding input transformer and a multipath rectifier, and finally realizes output end cascade overlapping waves through a corresponding multipath inverter, so that the system has complex structure and difficult engineering design.
Or the alternating current power supply passes through the rectification unit, then passes through the inversion unit and then passes through the three-phase transformer, the secondary side in-phase windings of the three-phase transformer are connected in series again to form a cascading form, and the cascading form is connected in series between the power grid and the tested equipment through the output filter unit, so that the system is complex, and the cost is higher.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a broadband impedance characteristic measuring device, which is provided with a single rectifier, and can realize the output cascade overlapping wave of an inversion unit without a multi-winding transformer by configuring an isolation unit on a direct current side to provide a plurality of paths of direct current power sources, so that the broadband impedance characteristic of a port of grid-connected equipment is accurately measured, the equivalent switching frequency is improved, the circuit is simpler, the device volume is smaller, and the cost is lower.
In order to solve the technical problems, the utility model provides a broadband impedance characteristic measuring device, which comprises a rectifying unit, a chopping unit, an isolating unit, an inversion unit and an output filtering unit;
the isolation unit comprises n isolation type DC/DC converters, and the inversion unit comprises n H-bridge inverters, wherein n is more than or equal to 2;
the output filtering unit comprises three groups of LC filters; the rectification unit comprises one or more rectifiers, the alternating current side of each rectifier is connected with an alternating current power supply, and the direct current side of each rectifier is connected with the direct current input end of each isolated DC/DC converter in parallel;
the direct current output ends of the isolated DC/DC converters are respectively and correspondingly connected with the direct current side of an H-bridge inverter;
the alternating current output ends of all H-bridge inverters corresponding to the power grid A are connected in cascade, and then are connected in series between the power grid A phase and the tested equipment A phase through an A-phase LC filter; the alternating current output ends of the H-bridge inverters corresponding to the power grid B are connected in cascade, then connected in series between the power grid B phase and the tested equipment B phase through a B-phase LC filter, and the alternating current output ends of the H-bridge inverters corresponding to the power grid C are connected in cascade, and then connected in series between the power grid C phase and the tested equipment C phase through a C-phase LC filter.
Preferably, the broadband impedance characteristic measurement apparatus further includes a chopper unit, and a direct current side of the rectifier is connected in parallel to a direct current input terminal of each of the isolated DC/DC converters through the chopper unit.
Preferably, the chopper unit comprises a power module and an energy consumption unit which are connected to the direct current side of the rectifying unit, when the voltage of the direct current side rises above 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 broadband impedance characteristic measurement apparatus further includes a controller which is communicatively connected to each of the isolated DC/DC converters and each of the H-bridge inverters, respectively, and controls each of the H-bridge inverters to output a harmonic voltage including at least 1 to 1000 Hz.
In order to solve the technical problems, the utility model also provides a broadband impedance characteristic measurement system which comprises the broadband impedance characteristic measurement device.
After the device is adopted, the broadband impedance characteristic measuring device comprises a rectifying unit, a chopping unit, an isolating unit, an inversion unit and an output filtering unit; the isolation unit comprises n isolation type DC/DC converters, and the inversion unit comprises n H-bridge inverters, wherein n is more than or equal to 2; the output filtering unit comprises three groups of LC filters; the rectification unit comprises one or more rectifiers, the alternating current side of each rectifier is connected with an alternating current power supply, and the direct current side of each rectifier is connected with the direct current input end of each isolated DC/DC converter in parallel; the direct current output ends of the isolated DC/DC converters are respectively and correspondingly connected with the direct current side of an H-bridge inverter; the alternating current output ends of all H-bridge inverters corresponding to the power grid A are connected in cascade, and then are connected in series between the power grid A phase and the tested equipment A phase through an A-phase LC filter; the alternating current output ends of all the H-bridge inverters corresponding to the power grid B are connected in cascade, then connected in series between the power grid B phase and the tested equipment B phase through a B-phase LC filter, and the alternating current output ends of all the H-bridge inverters corresponding to the power grid C are connected in cascade, and then connected in series between the power grid C phase and the tested equipment C phase through a C-phase LC filter; the broadband impedance characteristic measuring device is provided with a single rectifier, a plurality of paths of direct current power supplies are provided by arranging the isolating units on the direct current side, the inverter units can output cascade overlapping waves without a multi-winding transformer, the broadband impedance characteristic of the port of the grid-connected equipment is accurately measured, the equivalent switching frequency is improved, the circuit is simpler, the device size is smaller, and the cost is lower.
Drawings
Fig. 1 is an overall configuration diagram of a broadband impedance characteristic measuring apparatus according to the present utility model.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the application clearer and more obvious, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
Referring to fig. 1, fig. 1 is an overall structure diagram of a broadband impedance characteristic measurement apparatus according to the present utility model.
The embodiment discloses a broadband impedance characteristic measuring device, which comprises a rectifying unit, a chopping unit, an isolating unit, an inversion unit and an output filtering unit;
the isolation unit comprises n isolation type DC/DC converters, and the inversion unit comprises n H-bridge inverters, wherein n is more than or equal to 2;
the output filtering unit comprises 3 groups of LC filters; the rectification unit comprises one or more rectifiers, the alternating current side of each rectifier is connected with an alternating current power supply, and the direct current side of each rectifier is connected with the direct current input end of each isolated DC/DC converter in parallel;
the direct current output ends of the isolated DC/DC converters are respectively and correspondingly connected with the direct current side of an H-bridge inverter;
the alternating current output ends of all H-bridge inverters corresponding to the power grid A are connected in cascade, and then are connected in series between the power grid A phase and the tested equipment A phase through an A-phase LC filter; the alternating current output ends of the H-bridge inverters corresponding to the power grid B are connected in cascade, then connected in series between the power grid B phase and the tested equipment B phase through a B-phase LC filter, and the alternating current output ends of the H-bridge inverters corresponding to the power grid C are connected in cascade, and then connected in series between the power grid C phase and the tested equipment C phase through a C-phase LC filter.
Example two
The present embodiment is based on the first embodiment, and in the present embodiment, the broadband impedance characteristic measurement apparatus further includes a chopper unit, and the DC side of the rectifier is connected in parallel to the DC input terminals of the respective isolated DC/DC converters through the chopper unit.
The chopping unit comprises a power module and an energy consumption unit which are connected to the direct current side of the rectifying unit, when the voltage of the direct current side rises above 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.
Example III
In this embodiment, the wideband impedance characteristic measurement apparatus further includes a controller, which is communicatively connected to each of the isolated DC/DC converters and each of the H-bridge inverters, and controls each of the H-bridge inverters to output a harmonic voltage including at least 1 to 1000 Hz.
Example IV
The embodiment discloses a broadband impedance characteristic measurement system, which comprises the broadband impedance characteristic measurement device according to any one of the first to third embodiments.
The broadband impedance characteristic measuring device is provided with a single rectifier, a plurality of paths of direct current power supplies are provided by arranging the isolating units on the direct current side, the inverter units can output cascade overlapping waves without a multi-winding transformer, the broadband impedance characteristic of the port of the grid-connected equipment is accurately measured, the equivalent switching frequency is improved, the circuit is simpler, the device size is smaller, and the cost is lower.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and are not thereby limiting the scope of the claims of the present application. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the present application shall fall within the scope of the claims of the present application.
Claims (5)
1. The broadband impedance characteristic measuring device is characterized by comprising a rectifying unit, a chopping unit, an isolating unit, an inversion unit and an output filtering unit;
the isolation unit comprises n isolation type DC/DC converters, and the inversion unit comprises n H-bridge inverters, wherein n is more than or equal to 2;
the output filtering unit comprises three groups of LC filters; the rectification unit comprises one or more rectifiers, the alternating current side of each rectifier is connected with an alternating current power supply, and the direct current side of each rectifier is connected with the direct current input end of each isolated DC/DC converter in parallel;
the direct current output ends of the isolated DC/DC converters are respectively and correspondingly connected with the direct current side of an H-bridge inverter;
the alternating current output ends of all H-bridge inverters corresponding to the power grid A are connected in cascade, and then are connected in series between the power grid A phase and the tested equipment A phase through an A-phase LC filter; the alternating current output ends of the H-bridge inverters corresponding to the power grid B are connected in cascade, then connected in series between the power grid B phase and the tested equipment B phase through a B-phase LC filter, and the alternating current output ends of the H-bridge inverters corresponding to the power grid C are connected in cascade, and then connected in series between the power grid C phase and the tested equipment C phase through a C-phase LC filter.
2. The broadband impedance characteristic measurement apparatus according to claim 1, further comprising a chopper unit, the direct current side of the rectifier being connected in parallel to the direct current input terminals of the respective isolated DC/DC converters through the chopper unit.
3. The broadband impedance characteristic measurement apparatus according to claim 2, wherein the chopper unit comprises a power module and an energy dissipation unit connected to the dc side of the rectifier unit, and when the voltage on the dc side increases beyond a protection constant value, the power module is triggered to operate, and the energy dissipation unit releases energy to reduce the voltage on the dc side.
4. A broadband impedance characteristic measurement apparatus according to claim 3, wherein: the broadband impedance characteristic measuring device also comprises a controller which is respectively connected with each isolated DC/DC converter and each H-bridge inverter in a communication way and controls each H-bridge inverter to output harmonic voltage at least comprising 1-1000 Hz.
5. A broadband impedance characteristic measurement system, characterized by: a broadband impedance characteristic measurement apparatus comprising any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322042136.6U CN220671537U (en) | 2023-07-31 | 2023-07-31 | Broadband impedance characteristic measuring device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322042136.6U CN220671537U (en) | 2023-07-31 | 2023-07-31 | Broadband impedance characteristic measuring device and system |
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| Publication Number | Publication Date |
|---|---|
| CN220671537U true CN220671537U (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322042136.6U Active CN220671537U (en) | 2023-07-31 | 2023-07-31 | Broadband impedance characteristic measuring device and system |
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| CN (1) | CN220671537U (en) |
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2023
- 2023-07-31 CN CN202322042136.6U patent/CN220671537U/en active Active
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