CN220527902U - Multistage serial high-voltage harmonic power supply and electrical test equipment - Google Patents
Multistage serial high-voltage harmonic power supply and electrical test equipment Download PDFInfo
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- CN220527902U CN220527902U CN202321610012.7U CN202321610012U CN220527902U CN 220527902 U CN220527902 U CN 220527902U CN 202321610012 U CN202321610012 U CN 202321610012U CN 220527902 U CN220527902 U CN 220527902U
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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
Abstract
The utility model provides a multistage serial high-voltage harmonic power supply and electrical test equipment, which can output direct-current high voltage and alternating-current harmonic waves with different frequencies in a superposition way, and comprises the following components: the direct-current high-voltage generation module comprises a high-frequency PWM generator, a step-up transformer and a voltage doubling rectifying unit, wherein high-frequency PWM waves sent by the high-frequency PWM generator are converted into direct-current high-voltage signals through the voltage doubling rectifying unit after being boosted by the step-up transformer; the alternating-current harmonic generation module comprises a plurality of alternating-current harmonic sources, each alternating-current harmonic source can output alternating-current harmonic signals with different frequencies, and the alternating-current harmonic sources are connected in series; the direct current high voltage generation module is connected with the alternating current harmonic generation module in series, and the output end of the alternating current harmonic generation module outputs a high voltage superposition signal of direct current high voltage and alternating current harmonic superposition of a plurality of frequencies.
Description
Technical Field
The utility model relates to the technical field of electrical test equipment, in particular to a multistage serial high-voltage harmonic power supply and electrical test equipment.
Background
Harmonics are important factors affecting long-term safe operation of the power grid. In the grid system, the presence of harmonics inevitably causes ineffective consumption of electric energy, reduces efficiency of the power system, reduces quality of the power system, causes distortion of power waveforms, and even causes an increase in voltage and current to overheat and damage the power equipment.
At present, in order to explore the influence of harmonics on power equipment in a power system, currently, domestic equipment can only output single voltage components, such as alternating current or direct current, and also can output harmonics of direct current high voltage and single adjustable frequency alternating current superposition. However, this is not the case for the actual operation of the power system, where the harmonics are often not single-shot, but rather complex waves consisting of a plurality of harmonic components of different frequencies. This is because in the power system, harmonics are generated by various nonlinear loads. These loads typically cause distortion in the voltage and current waveforms, thereby creating harmonics. These harmonic components tend to have different frequencies and amplitudes that are superimposed to form a complex waveform.
Therefore, the research and development of the power supply equipment capable of simultaneously outputting direct-current high voltage and multiple alternating-current harmonics is closer to the actual condition of daily operation of the power system.
Disclosure of Invention
The utility model provides a multistage serial high-voltage harmonic power supply and electrical test equipment, which can output direct-current high voltage and alternating-current harmonic waves with different frequencies and the same phase in a superposition manner, and can solve the problem that in the prior art, a direct-current source or an alternating-current source or a harmonic source with the direct-current high voltage and single frequency alternating current in a superposition manner is used for test, and the actual condition close to the daily operation of a power system cannot be met.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a multistage tandem type high voltage harmonic power supply which characterized in that: comprises the following steps:
the direct-current high-voltage generation module comprises a high-frequency PWM generator, a step-up transformer and a voltage doubling rectifying unit, wherein high-frequency PWM waves sent by the high-frequency PWM generator are converted into direct-current high-voltage signals through the voltage doubling rectifying unit after being boosted by the step-up transformer;
the alternating-current harmonic generation module comprises a plurality of alternating-current harmonic sources, each alternating-current harmonic source can output alternating-current harmonic signals with different frequencies, and the alternating-current harmonic sources are connected in series;
the direct current high voltage generation module is connected with the alternating current harmonic generation module in series, and the output end of the alternating current harmonic generation module outputs a high voltage superposition signal of direct current high voltage and alternating current harmonic superposition of a plurality of frequencies.
Further, the phases of the alternating-current harmonic signals output by the alternating-current harmonic generation module are consistent.
Further, the ac harmonic source includes a primary ac harmonic source, a tertiary ac harmonic source and a quintic ac harmonic source, and the primary ac harmonic source, the tertiary ac harmonic source and the quintic ac harmonic source can output a primary ac harmonic signal, a tertiary ac harmonic signal and a quintic ac harmonic signal, respectively.
Further, each alternating current harmonic source of the alternating current harmonic generation module is connected with a transformer respectively, the low-voltage side of the transformer is connected with the alternating current harmonic source respectively, and the high-voltage sides of the transformers are connected in series.
Further, a first end of a transformer high-voltage side of the primary alternating current harmonic source is connected with an output end of the direct current high-voltage generation module, a second end of the transformer high-voltage side of the primary alternating current harmonic source is connected with a first end of a transformer high-voltage side of the tertiary alternating current harmonic source, a second end of the transformer high-voltage side of the tertiary alternating current harmonic source is connected with a first end of a transformer high-voltage side of the quintic alternating current harmonic source, and a second end of the transformer high-voltage side of the quintic alternating current harmonic source is used for being connected with a tested product.
Further, the voltage doubling rectifying unit comprises a capacitor C1 and a diode D1 connected to two ends of the high-voltage side of the step-up transformer, a diode D2 and a capacitor C2 are connected to two ends of the diode D1 in parallel, a diode D3 and a capacitor C3 are connected to two ends of the diode D2 in parallel, one end of the capacitor C3 outputs a high-voltage direct current signal, and the capacitor C3 is grounded after being connected with a resistor R1 and the capacitor C4.
Further, the system also comprises a measurement and control module, wherein the measurement and control module comprises connected components:
the high-low voltage conversion unit is connected with the output ends of the direct-current high-voltage generation module and the alternating-current harmonic generation module and is used for converting an input high-voltage superposition signal into a low-voltage superposition signal;
the true effective value conversion unit comprises a true effective value conversion chip AD637, and the true effective value conversion unit changes the effective value of the input low-voltage superposition signal into a direct-current analog signal to be output;
the analog-to-digital conversion unit comprises an analog-to-digital conversion chip AD7705 and is used for converting the direct current analog signal input from the true effective value conversion unit into a digital signal;
and the singlechip unit is used for receiving the digital signals input by the analog-to-digital conversion unit.
Further, the measurement and control module is connected with the direct current high voltage generation module and the alternating current harmonic generation module through communication lines respectively, and the measurement and control module outputs feedback signals to the direct current high voltage generation module and the alternating current harmonic generation module according to the received high voltage superposition signals, and adjusts the output of the direct current high voltage generation module and the alternating current harmonic generation module.
An electrical test apparatus, characterized in that: the multi-stage series high-voltage harmonic power supply comprises the multi-stage series high-voltage harmonic power supply.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the multistage serial high-voltage harmonic power supply can generate specific harmonic components with various frequencies and amplitudes, and superimpose the harmonic components with direct-current high voltage for output, so that superimposed output of direct-current high voltage and multiple alternating-current harmonic waves is realized, and the harmonic waves in actual operation of a power grid are more met. Through the harmonic power supply provided by the utility model, a user can simulate the influence of harmonic components with different frequencies on power equipment and systems in a power system, and can meet the requirements of certain specific fields on high-voltage harmonics. In addition, the utility model adopts the multistage series alternating current harmonic source, so that the output voltage is more stable, and the voltage stability and reliability are higher. The high-voltage harmonic power supply has the advantages of simplicity, stability, reliability and the like, and is widely applied to electrical test equipment.
Drawings
FIG. 1 is a block diagram of a multi-stage series high voltage harmonic power supply in an embodiment;
FIG. 2 is a circuit diagram of a multi-stage series high voltage harmonic power supply in an embodiment;
FIG. 3 is a block diagram of another multi-stage series high voltage harmonic power supply in an embodiment;
FIG. 4 is a schematic diagram of another multi-stage series high voltage harmonic power supply in an embodiment;
fig. 5 is a signal waveform diagram of the final output of the multistage serial high-voltage harmonic power supply in the embodiment.
Detailed Description
Referring to fig. 1 and 2, the multistage serial high-voltage harmonic power supply of the utility model comprises the following components:
the direct-current high-voltage generation module 100, the direct-current high-voltage generation module 100 comprises a high-frequency PWM generator 101, a step-up transformer 102 and a voltage doubling rectifying unit 103, and the high-frequency PWM wave sent by the high-frequency PWM generator 101 is converted into a direct-current high-voltage signal through the voltage doubling rectifying unit 103 after being boosted by the step-up transformer 102;
the alternating-current harmonic generation module 200, the alternating-current harmonic generation module 200 comprises a plurality of alternating-current harmonic sources, each alternating-current harmonic source can output alternating-current harmonic signals with different frequencies, and the alternating-current harmonic sources are connected in series;
the dc high voltage generation module 100 is connected in series with the ac harmonic generation module 200, and an output terminal of the ac harmonic generation module 200 outputs a high voltage superposition signal in which a dc high voltage is superimposed with ac harmonics of a plurality of frequencies.
In particular, in one embodiment of the present utility model, the ac harmonic signals output by the ac harmonic generation module 200 are in phase alignment,
in this embodiment, the ac harmonic source includes a primary ac harmonic source 201, a tertiary ac harmonic source 202, and a quintic ac harmonic source 203, where the primary ac harmonic source 201, the tertiary ac harmonic source 202, and the quintic ac harmonic source 203 can output primary, tertiary, and quintic ac harmonic signals, respectively;
the primary ac harmonic source 201, the tertiary ac harmonic source 202, and the quintic ac harmonic source 203 of the ac harmonic generation module are connected to the transformers T2, T3, and T4, respectively, the low voltage sides of the transformers T2, T3, and T4 are connected to the output ends of the primary ac harmonic source 201, the tertiary ac harmonic source 202, and the quintic ac harmonic source 203, respectively, and the high voltage sides of the transformers T2, T3, and T4 are connected in series.
Specifically, a first end of a high-voltage side of a transformer T2 of the primary ac harmonic source is connected to an output end of the dc high-voltage generation module 100, a second end of the high-voltage side of the transformer T2 of the primary ac harmonic source is connected to a first end of a high-voltage side of a transformer T3 of the tertiary ac harmonic source, a second end of the high-voltage side of the transformer T3 of the tertiary ac harmonic source is connected to a first end of a high-voltage side of a transformer T4 of the quintic ac harmonic source, and a second end of the high-voltage side of the transformer T4 of the quintic ac harmonic source is used for connecting a test object.
The voltage doubling rectifying unit 103 includes a capacitor C1 and a diode D1 connected to two ends of the high voltage side of the step-up transformer, two ends of the diode D1 are connected in parallel with a diode D2 and a capacitor C2, two ends of the diode D2 are connected in parallel with a diode D3 and a capacitor C3, one end of the capacitor C3 outputs a high voltage direct current signal, and the capacitor C3 is grounded after being connected with a resistor R1 and the capacitor C4.
In an embodiment, the high-frequency PWM generator of the dc high-voltage generating module 100 provides a high-frequency PWM wave, and the high-frequency PWM wave is boosted by a booster transformer and then input into a voltage-doubler rectifying unit, when the first positive half cycle of the input waveform is input, the capacitor C1 is charged, when the first negative half cycle is input, the charged capacitor C1 is superimposed with the power output by the transformer to charge the capacitor C2, and when the second positive half cycle is input, the charged capacitor C2 is superimposed with the power output by the transformer to charge the capacitor C3 to obtain rectified multiple high voltages, thereby outputting a dc high voltage;
the alternating current harmonic generation module comprises three parts of primary, tertiary and quintic alternating current harmonic sources, primary, tertiary and quintic alternating current harmonic sources are respectively boosted by transformers T2, T3 and T4 and then are mutually connected in series, so that output voltage is more stable and reliable, superimposed harmonic with adjustable primary, tertiary and quintic same-phase alternating current amplitude is obtained, direct current high voltage and primary, tertiary and quintic same-phase alternating current harmonic sources are connected in series, current is limited at the connection part by a resistor R1, and harmonic power sources with superimposed direct current high voltage and primary, tertiary and quintic alternating current harmonic sources can be obtained by adopting capacitor C4 filtering on the ground, the output is more stable, reliable and safe, and the superimposed and mixed state of direct current components and multiple alternating current harmonic components in the daily operation of the power system can be simulated more accurately;
referring to fig. 3 and 4, in one embodiment of the present utility model, the system further includes a measurement and control module 300, where the measurement and control module 300 includes:
the high-low voltage conversion unit 301, the high-low voltage conversion unit 301 is connected with the output ends of the direct current high voltage generation module 100 and the alternating current harmonic generation module 200, and is used for converting an input high-voltage superposition signal into a low-voltage superposition signal;
a true effective value conversion unit 302, the true effective value conversion unit 302 including a true effective value conversion chip AD637, the true effective value conversion unit 302 converting an effective value of the input low-voltage superimposed signal into a direct-current analog signal output;
an analog-to-digital conversion unit 303, the analog-to-digital conversion unit 303 including an analog-to-digital conversion chip AD7705 for converting the direct current analog signal input from the true effective value conversion unit 302 into a digital signal;
the singlechip unit 304, the singlechip unit 304 receives the digital signal input by the analog-to-digital conversion unit, and the model adopted in the embodiment is the Atmega128, and of course, the singlechip of other models of ATMEL company or the singlechip of other companies can also be adopted.
The measurement and control module 300 is respectively connected with the direct current high voltage generation module 100 and the alternating current harmonic generation module 200 through communication wires, and the measurement and control module 300 outputs feedback signals to the direct current high voltage generation module 100 and the alternating current harmonic generation module 200 according to the received high voltage superposition signals, and adjusts the output of the direct current high voltage generation module 100 and the alternating current harmonic generation module 200.
The measurement and control module samples, the sampling signal is a high-voltage superposition signal generated by the direct-current high-voltage generation module and superimposed by alternating-current high-voltage generated by the alternating-current harmonic generation module, the high-voltage superposition signal outputs a low-voltage superposition signal through the high-low voltage conversion circuit, the high-precision true effective value conversion chip AD637 processes the low-voltage superposition signal with the complex waveform and converts the low-voltage superposition signal into a high-precision direct-current analog signal, and therefore the subsequent chip AD7705 can process the direct-current signal. The AD7705 converts the direct current analog signal with the true effective value into a digital signal and sends the voltage data to the AVR singlechip Atmega128, the Atmega128 and the upper computer transmit data through the optical fiber communication unit, and the upper computer controls the singlechip Atmega128 to adjust the output of the direct current generation module and the alternating current harmonic generation module through the 485 communication unit, so that the output of the harmonic power supply is controlled, and the output of the equipment is more accurate, safe and reliable.
The measurement and control module is respectively connected with the direct current high voltage generation module and the alternating current harmonic generation module through communication wires and performs real-time communication. The direct-current high-voltage component and the output of the first, third and fifth same-phase alternating-current harmonic components can be controlled in real time through the measurement and control module. In addition, the high-voltage direct-current signal output by the direct-current high-voltage generation module under the running state of the real-time sampling equipment; the first, third and fifth same-phase alternating-current harmonic signals are output by the alternating-current harmonic generation module; and the high-voltage direct-current high voltage and the signals output by the superposition of the first-time, third-time and fifth-time same-phase alternating-current harmonic waves are compared with the amplitude set by the measurement and control module in real time, so that the output is calibrated. The measurement and control module controls and monitors the output signals in real time, so that the output control is more accurate, the operation is simple, and the operation is easy to get on hand.
Fig. 5 shows waveforms of a positive output dc high voltage and superimposed ac harmonics of the same phase, primary, tertiary and quintic phases, which are finally output by the multi-stage series high voltage harmonic power supply according to the embodiment. The utility model is more similar to the actual harmonic wave in the daily operation of the power system, meets the actual requirement better, and can also output the reverse direct current high voltage and the harmonic wave overlapped with the same-phase primary, tertiary and quintic alternating current harmonic wave.
In the embodiment of the utility model, an electrical test device is also provided, which comprises the multistage series high-voltage harmonic power supply.
In the embodiment, the direct current component and the multiple alternating current harmonic component of the harmonic power supply output are adjustable, and the harmonic power supply can output direct current high voltage and multiple alternating current harmonic in a superposition mode through multistage series connection. Compared with the traditional high-voltage power supply, the power supply provided by the patent has the advantages that the output voltage is more practical, more stable, more reliable and the like, and the output of equipment can be controlled and regulated in real time. The power supply provided by the patent can meet the requirement of a specific field on high-voltage harmonic waves, has wide application prospect, is applied to electric test equipment, and can simulate the influence of harmonic wave components with different frequencies in a power system on the power equipment and the system, specifically analyze the harmonic wave characteristics of the power system and estimate the influence caused by the harmonic waves, thereby providing a harmonic wave treatment scheme.
The above embodiments are provided for illustrating the technical concept and features of the present utility model, and are mainly intended to enable those skilled in the art to understand the content of the present utility model and implement the same according to the content of the present utility model, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made according to the spirit or features of the present utility model should be construed to be included in the scope of the present utility model.
Claims (9)
1. The utility model provides a multistage tandem type high voltage harmonic power supply which characterized in that: comprises the following steps:
the direct-current high-voltage generation module comprises a high-frequency PWM generator, a step-up transformer and a voltage doubling rectifying unit, wherein high-frequency PWM waves sent by the high-frequency PWM generator are converted into direct-current high-voltage signals through the voltage doubling rectifying unit after being boosted by the step-up transformer;
the alternating-current harmonic generation module comprises a plurality of alternating-current harmonic sources, each alternating-current harmonic source can output alternating-current harmonic signals with different frequencies, and the alternating-current harmonic sources are connected in series;
the direct current high voltage generation module is connected with the alternating current harmonic generation module in series, and the output end of the alternating current harmonic generation module outputs a high voltage superposition signal of direct current high voltage and alternating current harmonic superposition of a plurality of frequencies.
2. The multi-stage series high voltage harmonic power supply of claim 1 wherein: and the phases of the alternating-current harmonic signals output by the alternating-current harmonic generation module are consistent.
3. The multi-stage series high voltage harmonic power supply of claim 1 wherein: each alternating current harmonic source of the alternating current harmonic generation module is respectively connected with a transformer, the low-voltage side of the transformer is respectively connected with the alternating current harmonic source, and the high-voltage sides of the transformers are connected in series.
4. A multi-stage series high voltage harmonic power supply as claimed in claim 3 wherein: the alternating current harmonic source comprises a primary alternating current harmonic source, a tertiary alternating current harmonic source and a quintic alternating current harmonic source, and the primary alternating current harmonic source, the tertiary alternating current harmonic source and the quintic alternating current harmonic source can output primary alternating current harmonic signals, tertiary alternating current harmonic signals and quintic alternating current harmonic signals respectively.
5. The multi-stage series high voltage harmonic power supply of claim 4 wherein: the first end of the transformer high-voltage side of the primary alternating current harmonic source is connected with the output end of the direct current high-voltage generation module, the second end of the transformer high-voltage side of the primary alternating current harmonic source is connected with the first end of the transformer high-voltage side of the tertiary alternating current harmonic source, the second end of the transformer high-voltage side of the tertiary alternating current harmonic source is connected with the first end of the transformer high-voltage side of the quintic alternating current harmonic source, and the second end of the transformer high-voltage side of the quintic alternating current harmonic source is used for being connected with a tested product.
6. The multi-stage series high voltage harmonic power supply of claim 1 wherein: the voltage doubling rectifying unit comprises a capacitor C1 and a diode D1 which are connected to two ends of a high-voltage side of the step-up transformer, the two ends of the diode D1 are connected with a diode D2 and a capacitor C2 in parallel, the two ends of the diode D2 are connected with a diode D3 and a capacitor C3 in parallel, one end of the capacitor C3 outputs a high-voltage direct current signal, and the capacitor C3 is grounded after being connected with a resistor R1 and the capacitor C4.
7. The multi-stage series high voltage harmonic power supply of claim 1 wherein: the system also comprises a measurement and control module, wherein the measurement and control module comprises connected components:
the high-low voltage conversion unit is connected with the output ends of the direct-current high-voltage generation module and the alternating-current harmonic generation module and is used for converting an input high-voltage superposition signal into a low-voltage superposition signal;
the true effective value conversion unit changes the effective value of the input low-voltage superposition signal into a direct-current analog signal to be output;
an analog-to-digital conversion unit for converting the direct current analog signal input from the true effective value conversion unit into a digital signal;
the singlechip unit receives the digital signal input by the analog-to-digital conversion unit;
the measurement and control module is respectively connected with the direct current high voltage generation module and the alternating current harmonic generation module through communication wires, and outputs feedback signals to the direct current high voltage generation module and the alternating current harmonic generation module according to the received high voltage superposition signals, and the output of the direct current high voltage generation module and the output of the alternating current harmonic generation module are adjusted.
8. The multi-stage series high voltage harmonic power supply of claim 7 wherein: the true effective value conversion unit comprises a true effective value conversion chip AD637, and the analog-to-digital conversion unit comprises an analog-to-digital conversion chip AD7705.
9. An electrical test apparatus, characterized in that: a multi-stage series high voltage harmonic power supply comprising the method of claim 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321610012.7U CN220527902U (en) | 2023-06-25 | 2023-06-25 | Multistage serial high-voltage harmonic power supply and electrical test equipment |
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| CN202321610012.7U CN220527902U (en) | 2023-06-25 | 2023-06-25 | Multistage serial high-voltage harmonic power supply and electrical test equipment |
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