CN105675932B - Test power supply for aging of lightning arrester of high-voltage direct-current transmission system - Google Patents
Test power supply for aging of lightning arrester of high-voltage direct-current transmission system Download PDFInfo
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Abstract
The invention provides a test power supply for aging of a lightning arrester for a high-voltage direct-current transmission system, which comprises: the device comprises a microprocessor, a high-voltage direct-current voltage generator, a controlled direct-current source, a boosting transformer, a capacitor bank, a ripple wave generator and a power amplifier module; the controlled direct current source unidirectionally sends data to the microprocessor; the high-voltage direct-current voltage generator, the ripple wave generator and the power amplifier module respectively perform bidirectional data transmission with the microprocessor to realize measurement and control; the capacitor bank is connected in parallel at the output end of the high-voltage direct-current voltage generator; one end of the step-up transformer is connected with the controlled direct current source, and the other end of the step-up transformer is connected with the low-voltage output end of the high-voltage direct current voltage generator; the high-voltage output end of the high-voltage direct-current voltage generator is connected with a load. According to the invention, through research and development design of corresponding devices, the voltage waveform of the aging test of the HVDC lightning arrester is closer to the reality, and the aging performance examination is more standard and strict.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a test power supply for accelerated aging of a direct current lightning arrester in a High Voltage Direct Current (HVDC) power transmission system.
Background
The lightning arrester in the alternating current transmission system bears sine wave voltage in daily life, and harmonic voltage components are very small, so that the waveform is very simple.
The aging test of the arrester adopts a daily power frequency sine wave high-voltage power supply, and does not need to carry out special power supply development, while the voltage waveform of the arrester in the high-voltage direct-current power transmission system shown in figure 1, particularly a valve arrester and a bridge arrester, has obvious direct-current components and a ripple component with rich harmonic voltage, and is complex. Up to now, aging tests for such dc system arresters at home and abroad are all carried out by using a back-to-back high voltage dc transmission system with a reduced ratio, so that the voltage waveform on a test sample is expected to be close to the actual voltage waveform of the HVDC arrester.
In order to install a set of back-to-back high-voltage direct-current transmission system with a certain volume compression ratio in a limited space, reduce the manufacturing cost of the system as much as possible and reduce the excessive reactive power requirement in operation as much as possible, the direct-current transmission system not only needs to be reduced in voltage according to a certain proportion, but also needs to be reduced in current according to a certain proportion.
At present, the output capacity of a module capable of providing voltage for each part in the back-to-back direct current transmission system for carrying out an aging test on a sample is reduced too much, and the volume of the sample cannot be reduced, so that the problem of 'small horse drawing cart' occurs in the operation process. When no test sample exists (namely no-load running), the voltage waveform can also be immediately distorted after the test sample load is added for running, the gradient of the commutation voltage and commutation overshoot are obviously insufficient, and even the commutation process can not be seen from the voltage waveform frequently.
In order to improve the reliability of the aging performance test of the valve plate of the lightning arrester of the HVDC power transmission system and the reliability of the test result, a new aging test power supply of the lightning arrester of the HVDC system needs to be developed.
Disclosure of Invention
In order to overcome the above defects in the prior art, the present invention provides a test power supply for aging of a lightning arrester of a high voltage direct current transmission system, comprising: the device comprises a microprocessor, a high-voltage direct-current voltage generator, a controlled direct-current source, a boosting transformer, a capacitor bank, a ripple wave generator and a power amplifier module;
the controlled direct current source unidirectionally sends data to the microprocessor; the high-voltage direct-current voltage generator, the ripple wave generator and the power amplifier module respectively transmit data with the microprocessor in a bidirectional way; the capacitor bank is connected in parallel at the output end of the high-voltage direct-current voltage generator; one end of the step-up transformer is connected with the controlled direct current source, and the other end of the step-up transformer is connected with the low-voltage output end of the high-voltage direct current voltage generator; the high-voltage output end of the high-voltage direct-current voltage generator is connected with a load.
The capacitor bank comprises a decoupling capacitor and a high-voltage bypass capacitor, and the decoupling capacitor is connected in parallel with the high-voltage bypass capacitor. The microprocessor decomposes the direct current voltage into a direct current component and a ripple component; the direct current component is transmitted to a high-voltage direct current voltage generator; the ripple component is delivered to a ripple generator and a power amplifier module.
The high-voltage direct-current voltage generator converts the digital quantity of the direct-current component into an analog quantity; the ripple generator and power amplifier module comprises a ripple generator and a power amplifier.
The ripple wave generator converts the digital quantity of the ripple component into an analog quantity; the power amplifier amplifies the voltage and output power of the ripple component analog quantity.
The step-up transformer comprises three windings: the primary winding is connected with the output ends of the ripple generator and the power amplifier module; a secondary winding, one end of which is connected with the low-voltage output end of the high-voltage direct-current voltage generator, and the other end of which is connected with a controlled direct-current source; and the tertiary winding is connected to the output end of the controlled direct current source.
The primary winding refers to a low-voltage input winding; the secondary winding refers in particular to a high-voltage output winding for boosting ripple voltage output by the ripple generator and the power amplifier; the tertiary winding is particularly a magnetic bias compensation winding for preventing load current from forming direct current magnetic bias.
The controlled direct current source comprises a current measuring device; the current measuring device is connected in series with the high-voltage output winding of the step-up transformer and measures the direct current in the high-voltage output winding.
The controlled direct current source calculates and converts direct current into output direct current; the output direct current flows into the magnetic bias compensation winding to compensate the direct current magnetic bias caused by the direct current in the high-voltage winding.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
1. according to the invention, through research and development design of corresponding devices, the waveform of the aging test voltage of the HVDC arrester is closer to the reality, and the aging performance examination is more standard and strict.
2. The invention can realize the voltage waveform for testing the valve and bridge (containing 6 pulsation and 12 pulsation) arrester and the valve arrester under the conditions of any triggering angle alpha and any phase-change angle mu of the HVDC.
3. The device has the volume about 1/5 of the traditional scaling back-to-back high-voltage direct-current transmission system device, the power consumption is about 1/3 in operation, no reactive power is required, and a reactive power compensation cabinet or a filter cabinet is not required to be specially arranged.
Drawings
Fig. 1 HVDC 6 pulsating converter bridge voltage and valve voltage waveforms;
FIG. 2 is a schematic block diagram of a test power supply of the present invention.
Detailed Description
The test power supply of the present invention is described in further detail below with reference to fig. 2.
In the high voltage test power supply shown in fig. 2, the microprocessor generates a voltage waveform at a location associated with a High Voltage Direct Current (HVDC) converter. The voltage waveform of the relevant part of the HVDC converter (e.g. bridge terminal, both sides of valve, etc.) is a dc voltage as shown in fig. 1, but the dc voltage also contains a ripple voltage with rich harmonic. Since the transformer cannot amplify and transform the dc voltage, it is necessary to separately process the dc component and the ripple component (ac component) of the dc voltage, that is, to decompose the waveform into the dc component and the ripple component.
The main functions of the microprocessor are: the direct current voltage is decomposed into a direct current component and a ripple wave component (digital quantity) through calculation of a direct current voltage mathematical model, and then the calculated direct current quantity and the calculated ripple wave quantity are respectively sent to a high-voltage direct current voltage generator, a ripple wave generator and a power amplifier, so that the digital quantity is converted into an analog quantity.
And the data in the high-voltage direct current voltage generator module, the controlled direct current source module, the ripple generator and the power amplifier module are transmitted back to the microprocessor for determining whether the direct current voltage generator and the ripple generator receive the data and judging whether the converted analog voltage is accurate at any time.
The microprocessor uses the high voltage direct current voltage generator to realize the high voltage output of pure direct current voltage with the direct current component that the waveform decomposes and obtains, and high voltage direct current voltage generator output end is parallelly connected with the capacitor bank, and this capacitor bank includes: a decoupling capacitor and a high voltage bypass capacitor.
The two output ends of the high-voltage direct-current voltage generator are respectively a high-voltage output end and a low-voltage output end, and the high-voltage direct-current voltage generator has large internal impedance and small capacity, so that a high-impedance direct-current voltage source is externally shown, and the voltage source property is not ideal. The decoupling capacitor with larger capacity is connected in parallel at the output end of the high-voltage direct-current voltage generator to play a role of filtering, so that the output voltage of the high-voltage direct-current voltage generator can be kept constant, and the property of a voltage source is idealized. The other function of the capacitor bank is to bypass the ripple, and prevent the ripple voltage from entering the high-voltage direct-current voltage generator to interfere the operation. The problem of insufficient capacity of the high-voltage direct-current voltage generator is solved by the parallel high-voltage bypass capacitor.
The microprocessor sends the ripple digital quantity obtained by waveform decomposition to the ripple wave generator and the power amplifier module, and the ripple wave generator converts the digital quantity into analog quantity, thereby realizing D/A conversion. After the ripple component is converted from digital to analog, the power amplifier is used to boost the voltage and increase its output power. The ripple component realizes high-voltage output of the ripple component through a step-up transformer.
The step-up transformer is a three-winding transformer, and three windings of the step-up transformer are respectively as follows: a low-voltage/input winding (primary winding) connected with the output ends of the ripple generator and the power amplifier module, and mainly used for inputting ripple voltage; the high-voltage winding (secondary winding) is connected with the output end of the high-voltage direct-current voltage generator in series, and the high-voltage direct-current voltage generator is mainly used for amplifying and boosting the ripple voltage of the low-voltage winding; and the magnetic bias compensation winding (tertiary winding) is connected with the output end of the controlled direct current source. The three-winding transformer realizes high voltage output of ripple components in voltage waveforms of relevant parts of the HVDC converter, and solves the problem of direct current magnetic biasing of the transformer after loading.
The controlled direct current source is provided with a set of current measuring device which is connected in series in a high-voltage output winding of the step-up transformer, measures direct current (the current is small) flowing through the high-voltage output winding of the step-up transformer, converts the measured direct current through a series of calculations, and outputs a matched direct current to a tertiary winding of the step-up transformer for compensating the direct current magnetic bias of the transformer caused by the direct current in the high-voltage winding of the step-up transformer.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (5)
1. A test power supply for aging of a lightning arrester of a high-voltage direct-current transmission system is characterized by comprising: the device comprises a microprocessor, a high-voltage direct-current voltage generator, a controlled direct-current source, a boosting transformer, a capacitor bank, a ripple wave generator and a power amplifier module;
the controlled direct current source unidirectionally sends data to the microprocessor;
the controlled direct current source comprises a current measuring device;
the current measuring device is connected with a high-voltage output winding of the boosting transformer in series and measures the direct current in the high-voltage output winding;
the controlled direct current source calculates and converts the direct current into output direct current;
the output direct current flows into the boosting transformer magnetic biasing compensation winding to compensate direct current magnetic biasing caused by the direct current in the high-voltage winding;
the high-voltage direct-current voltage generator, the ripple generator and the power amplifier module are respectively in bidirectional data transmission with the microprocessor to realize measurement and control;
the capacitor bank is connected in parallel at the output end of the high-voltage direct-current voltage generator;
one end of the step-up transformer is connected with the controlled direct current source, and the other end of the step-up transformer is connected with the low-voltage output end of the high-voltage direct current voltage generator;
the step-up transformer comprises three windings:
the primary winding is connected with the output ends of the ripple generator and the power amplifier module;
a secondary winding having one end connected to the high voltage DC voltage generator and the other end connected to the controlled DC current source;
the tertiary winding is connected to the output end of the controlled direct current source;
the primary winding is a low-voltage input winding;
the secondary winding is a high-voltage output winding for boosting the ripple component;
the tertiary winding is a magnetic bias compensation winding for preventing load current from forming direct current magnetic bias;
and the high-voltage output end of the high-voltage direct-current voltage generator is connected with a load.
2. Test power supply according to claim 1,
the capacitor bank includes a decoupling capacitor and a high voltage bypass capacitor, the decoupling capacitor and the high voltage bypass capacitor being connected in parallel.
3. Test power supply according to claim 1,
the microprocessor decomposes the direct current voltage into a direct current component and a ripple component;
the direct current component is sent to the high-voltage direct current voltage generator; the ripple component is sent to the ripple generator and the power amplifier module.
4. Test power supply according to claim 3,
the high-voltage direct-current voltage generator converts the digital quantity of the direct-current component into an analog quantity; the ripple generator and power amplifier module comprises a ripple generator and a power amplifier.
5. Test power supply according to claim 4,
the ripple generator converts the digital quantity of the ripple component into an analog quantity;
and the power amplifier is used for performing voltage boosting and output power amplification on the ripple component analog quantity.
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| CN108845167B (en) * | 2018-04-15 | 2021-01-05 | 武汉市整流器研究所 | Large current generator device |
| CN111413561A (en) * | 2020-03-24 | 2020-07-14 | 哈尔滨工业大学 | Power supply ripple simulation system with state monitoring function |
| CN115776218B (en) * | 2023-02-13 | 2023-04-18 | 山东艾诺智能仪器有限公司 | High-power high-voltage direct-current ripple power supply |
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| CN101358993A (en) * | 2007-07-31 | 2009-02-04 | 上海电气自动化设计研究所有限公司 | Power supply system for on-line detecting resistance current of lightning arrester |
| CN103176069A (en) * | 2011-12-23 | 2013-06-26 | 特变电工沈阳变压器集团有限公司 | Test method for applying DC (Direct Current) magnetic bias current of transformer |
| CN102882366B (en) * | 2012-09-06 | 2015-06-17 | 海能达通信股份有限公司 | Ripple power supply device and method for providing direct-current voltage with ripples |
| CN203720342U (en) * | 2014-03-12 | 2014-07-16 | 国家电网公司 | Direct current magnetic bias automatic compensation device of metering winding of current transformer |
| CN204065267U (en) * | 2014-07-16 | 2014-12-31 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of ferroresonance loop based on DC magnetic biasing |
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