CN2904470Y - Surge voltage generator suitable for high power valve sample - Google Patents

Abstract

This utility model relates to an impulse voltage generator used for high-power valve testing products, which comprises a rectifying charging part which includes an AC power and a rectifier silicon pile, the three parallel charging part of capacitor Cs and the resistance R, the modulating inductor L, the modulating part of the resistance Rs, Rd, the measuring part Vd and the tested product P and which is characterized in that this model could make use of the modulating inductor to avoid the over-great body capacitor by adopting the method that the modulating inductor takes part in the adjustment of the test waveforms. The joint of the modulating inductor makes the adjustment of the surge waveform more flexible and convenient so that the efficiency of getting special surge waveform needed in the high-power power electronic device can be improved greatly and at the same time, the modulating inductor reduces the whole cost of the generator which saves the energy consumption in the testing process.

Description

Be applicable to the impulse voltage generator of high-power valve sample

Technical field

The utility model relates to the device of the high power electronic equipment high-voltage test techniques in electric power system and the power electronic system, particularly a kind of impulse voltage generator that is applicable to high-power valve sample.

Background technology

Power electronic technology is to bring the new technology of revolutionary advancement to power industry, also is one of popular research topic of current power industry circle.Advanced power electronic technology has realized organic fusion with manufacturing technology, modern control technology and the traditional electrical network technology of electronic switching device.And along with power system development, this technology develops towards big capacity, high-power direction, large quantities of high power electronic equipments based on power electronic device having occurred also progressively uses in electric power system, as Static Var Compensator (SVC), transistor controlling series compensator (TCSC), STATCOM (STATCOM) and direct current transportation (HVDC) etc.Believe the progressively propelling along with national network, transferring electricity from the west to the east and alternating current-direct current UHV transmission, high-power electric and electronic technology and application thereof will obtain great development in China.

The core devices of modern high power electronic equipment be single, double to high-power valve, high-power valve is the silicon cell (thyristor, GTO, IGCT etc.) by half control or full control, dynamic voltage-balancing, the static state voltage equipoise circuit, triggering system, radiator and insulation system are formed by series-parallel mode, complex structure; Because its actual operating mode in electric power system is also very complicated, therefore high-power valve is a very complicated electric component, must set up and the corresponding research technique of its actual condition again.

The IEC standard---the dielectric test that clearly proposes high-power valve in 61954 and 60700 mainly comprises AC and DC withstand voltage test, impulse voltage test and local discharge test, and wherein impulse voltage test also comprises some extraordinary operation wave impacts tests.Impulse voltage generator is the device that is used to carry out shock test, the insulation property when mainly studying test specimen and standing lightning overvoltage or switching overvoltage.Its operation principle can be summarized as at first capacitor charged in parallel, then discharged in series.This body capacitance of general impulse voltage generator is much larger than the electric capacity of test specimen, only needs wave head, wave rear resistance with regard to adjustable required waveform.But high-power valve sample has very big equivalent capacity, if still adopt traditional impulse voltage generator structure, it is big then to install overall volume, Heavy Weight, and loss is big and cost is high.

Summary of the invention

In order to overcome the above-mentioned defective in the middle of the prior art, the purpose of this utility model provides a kind of impulse voltage generator that is applicable to high-power valve sample, can significantly reduce required body capacitance, the test product scope that the expanding test device is suitable for is (both applicable to traditional high pressure test product, also applicable to the high-power valve sample in modern times), strengthen the waveform adjustment ability (lightning wave, operation involve extraordinary operation ripple etc.) of experimental rig.

The technical scheme in the invention for solving the technical problem is:

A kind of impulse voltage generator that is applicable to high-power valve sample is made of rectification charging part, three grades of charged in parallel parts, harmonic part, measure portion and test specimens; Wherein said rectification charging partly comprises AC power supplies and rectification silicon stack; Described three grades of charged in parallels part is made up of the charging capacitor and the charging resistor of three grades of parallel connections; Described harmonic part is by wave regulating resistor R _t, R _pConstitute with the harmonic inductance L, described measure portion is in parallel with described test specimen part.Be that with the main distinction of conventional impact voltage generator the harmonic of device has partly increased the harmonic inductance, avoid this excessive body capacitance by adopting the harmonic inductance; And the adding of harmonic inductance makes that the adjusting of surge waveform is flexible more, convenient, can more effectively obtain the required special surge waveform of high power electronic equipment; The harmonic inductance has also reduced the overall cost of generator, has saved the energy resource consumption in the process of the test.

Owing to adopted above-mentioned technical scheme, the beneficial effect that the utlity model has is: compare with traditional impulse voltage generator, by adopting the harmonic inductance, obtained cost-effective solution at high-power valve sample shock test with the flexibility that improved device and comprehensive.This body capacitance of required impulse voltage generator when this device has reduced the big electric capacity test product of test equivalence greatly, and then effectively provide cost savings, efficient improved; Realize the shock test of the various waveforms of the big electric capacity valve sample of modern equivalence, can take into account the shock test of the little electric capacity test product of conventional high-tension simultaneously; The employing of harmonic inductance makes that the adjusting of surge waveform is more flexible, and is convenient, improved the flexibility of percussion mechanism and comprehensive; Reduced the test loss, effectively saved test institute energy requirement, made and test more economical, more environmental protection.

Description of drawings

Fig. 1 is a kind of impulse voltage generator schematic diagram that is used for high-power valve sample of the present utility model;

Fig. 2 is a kind of Mathematical Modeling schematic diagram that is used for the impulse voltage generator of high-power valve sample of the present utility model;

Fig. 3 is a kind of standard operation wave-wave shape that is used for high-power valve sample of the present utility model;

Fig. 4 is a kind of extraordinary test of 20/200 μ s wave-wave shape that is used for high-power valve sample of the present utility model.

Embodiment

Below in conjunction with drawings and Examples the utility model is further specified.

Referring to accompanying drawing, the impulse voltage generator schematic diagram that is used for high-power valve sample is followed successively by as shown in Figure 1 from left to right: rectification charging part (AC power supplies and rectification silicon stack), three grades of charged in parallel part (charging capacitor C _sWith charging resistor R), harmonic part (wave regulating resistor R _t, R _p, the harmonic inductance L), measure portion (V _d) and test specimen (high-power valve sample P).

The impulse voltage generator of a kind of high power electronic equipment of the present utility model is compared with the conventional impact voltage generator, adopts the harmonic inductance L to avoid this excessive body capacitance dexterously; And the adding of harmonic inductance L makes that the adjusting of surge waveform is flexible more, convenient, can more effectively obtain the required special surge waveform of high power electronic equipment; The harmonic inductance has also reduced the overall cost of generator, has saved the energy resource consumption in the process of the test.

Present invention is described below in conjunction with Mathematical Modeling of the present utility model:

The Mathematical Modeling of Fig. 1 principle equivalence as shown in Figure 2.Referring to Fig. 2, C wherein ₁Be this body capacitance of generator, L ₁Be harmonic inductance, C ₂, R ₃And R ₂A part of resistance by test product parameter decision, R ₁And R ₂A part be wave regulating resistor, U ₁Be the voltage on this body capacitance.

With condenser voltage u ₁, u ₂With inductive current i ₂During as state variable, state equation is:

i ₁＝-C ₁du ₁/dt＝u ₁/R ₁+i ₂ (1)

i ₂＝C ₂du ₂/dt+u ₂/R ₃ (2)

u ₁＝L ₁di ₂/dt+R ₂i ₂+u ₂ (3)

The erased condition variable i ₂And u ₁After obtain about test product capacitance voltage u ₂The differential equation:

$a\frac{d^3{u}_2}{d{t}^3}+b\frac{d^2{u}_2}{d{t}^2}+c\frac{d{u}_2}{\mathrm{dt}}+d{u}_2=0---\left(4\right)$

In the formula: a=C ₁L ₁C ₂≠ 0; B=C ₁L ₁/ R ₃+ C ₁R ₂C ₂+ C ₂L ₁/ R ₁C=C ₁R ₂/ R ₃+ C ₂R ₂/ R ₁+ L ₂/ R ₁R ₃+ C ₁+ C ₂

d＝1/R ₃+1/R ₁+R ₂/R ₁R ₃。

The characteristic equation of formula (4) is: ar ³+ br ²+ cr+d=0 (5)

Formula (5) is a simple cubic equation, can turn to the reduction formula after subtracting root conversion r=y-b/3a:

y ³+3py+2q＝0 (6)

3p=c/a-b in the formula ²/ 3a ²2q=2b ³/ 27a ³-bc/3a ²+ d/a; So at q ²+ p ³Different value formulas (6) formula separate for:

(1) q ²+ p ³＞0, can get a real root y this moment ₁With two conjugation compound radical y ₂And y ₃:

$y_1=\sqrt[3]{-q+\sqrt{q^2+p^3}}+\sqrt[3]{-q-\sqrt{q^2+p^3}}=m_1+n_1;$

y ₂＝m ₁ω ₁+n ₁ω ₂；y ₃＝m ₁ω ₂+n ₁ω ₁

Wherein, ω ₁=(1+j )/2; ω ₂=(1-j )/2.

(2) q ²+ p ³=0, can solve three real roots (wherein having two equates) this moment:

$y_1=2\sqrt[3]{-q};y_2==y_3=-\sqrt[3]{-q}$

(3) q ²+ p ³＜0, introduce trigonometric function, 0＜φ＜π, $\cos \mathrm{\φ}=q/p\sqrt{-p},$ Also can solve three real roots:

$y_1=2\sqrt{-p}\cos (\mathrm{\φ}/3);$ $y_2=2\sqrt{-p}\cos (\mathrm{\φ}/3+2\mathrm{\π}/3);$

$y_3=2\sqrt{-p}\cos (\mathrm{\φ}/3+4\mathrm{\π}/3).$

According to corresponding q ²+ p ³Situation solve y after, utilize to subtract the root r that the root transform can instead be released characteristic equation, and then obtain the general solution of the differential equation (4), again according to initial condition (u ₁(0)=u _c, u ₂And i (0)=0 ₂(0)=0) determines that corresponding constant gets final product to such an extent that separate.The body parameter is as follows:

Specified nominal voltage is ± 300kV, progression is 3 grades, output voltage waveforms is 1.2/50 μ s, 250/2500 μ s, 20/200 μ s, steep shock wave 〉=1200kV/ μ s, efficient is 75%～95%, determine that according to the waveform needs working method divides two kinds of three grades of series connection and three grades of parallel connections, the body equivalent capacity is 0.167 μ F during three grades of series connection, and this moment, maximum output voltage was ± 300kV; Three grades of equivalent capacitys of body when in parallel are 1.5 μ F, and maximum output voltage is ± 100kV.

The harmonic waveform is as follows:

Harmonic parameter and measured waveform such as table 1 and shown in Figure 3, the wherein U of standard operation ripple (250/2500 μ s) waveform _pBe impact peak value voltage, t ₁Be the wave head time, t ₂Be the wave rear time:

The high-power valve sample standard operation of table 1 ripple harmonic parameter

Charging voltage kV	Peak value kV	Wave head μ s	Wave rear μ s	Efficient %	Wave front resistance Ω	Wave rear resistance Ω	Harmonic inductance mH
								55	41.19	256.05	2266.80	74.9	220+140	5.5//2.7k	393

Claims (1)

1, a kind of impulse voltage generator that is applicable to high-power valve sample is followed in series to form by rectification charging part, three grades of charged in parallel parts, harmonic part, measure portion and test specimens; Wherein said rectification charging partly comprises AC power supplies and rectification silicon stack; Described three grades of charged in parallels part is made up of the charging capacitor and the charging resistor of three grades of parallel connections; Described measure portion is in parallel with described test specimen part, it is characterized in that: described harmonic part is made of jointly the wave regulating resistor and the harmonic inductance of series connection.

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