CN101567562A - Comprehensive negative sequence and harmonic compensating system of electrified high-speed railway - Google Patents

Abstract

The invention discloses a comprehensive negative sequence and harmonic compensating system of electrified high-speed railway. The compensating system consists of a back-to-back type railway power regulator, two groups of thyristor controlled high-pass filters with different parameters and two groups of thyristor controlled reactors with different parameters in a combination way. The railway power regulator is connected with two power supplying arms at a secondary side of a three-phase V/V wiring traction transformer by two single-phase three-winding reducing transformer. The two groups of thyristor controlled high-pass filters are installed below the single-phase three-winding reducing transformer which is connected with the power supplying arm with relatively advanced voltage phase, and the two groups of thyristor controlled reactors are installed below the single-phase three-winding reducing transformer which is connected with the other power supplying arm with relatively hysteretic voltage phase. Compared with other compensating structures, the compensating system has the advantages of negative sequence and harmonic compensating effect improvement and active device capacity reduction, thus having good industrial application prospect.

Description

Electrified high-speed railway negative phase-sequence and harmonic synthesis bucking-out system

Technical field

The present invention relates to a kind of negative phase-sequence and harmonic synthesis bucking-out system, particularly a kind of electrified high-speed railway negative phase-sequence and harmonic synthesis bucking-out system.

Background technology

The construction of electrified high-speed railway will ensure for the national economic development provides safe and reliable, high-speed, big capacity transport power, be the important behave of further alleviating the railway transportation capability anxiety, improving transportation service brand and transportation service level.Yet, the high-speed railway electric power system is owing to single phase power supply mode and unique electric locomotive load power quality problems such as negative phase-sequence, harmonic wave, voltage fluctuation and flickering being highlighted, have a strong impact on the quality of power supply of high-speed railway electric power system along the line, bring baneful influence for the production of peripheral enterprise and user's life.Therefore, press for the power quality problems such as negative phase-sequence, harmonic wave, voltage fluctuation and flickering that the high-speed railway electric power system is existed and concentrate improvement.

The power quality problems such as negative phase-sequence, harmonic wave, voltage fluctuation and flickering that both at home and abroad the electrified high-speed railway electric power system produced have proposed multiple compensation scheme at present.Railway power regulator is wherein a kind of more typical compensation scheme.RPC be a kind of formula back-to-back can realize the adjuster that power bi-directional flows, can be to negative phase-sequence, humorously involve the idle comprehensive compensation of carrying out, but because RPC is an active device, rely on RPC to regulate two supply arm active power separately, realize negative sequence compensation, carry out harmonic wave control simultaneously, brought certain difficulty for jumbo RPC Project Realization, and raised cost.In addition, for the electrified high-speed railway electric power system that adopts three-phase V/V tie lines traction transformer as traction transformer, when adopting RPC adjusting active power that two supply arm active power are equated, three-phase system still has negative-sequence current to exist, can not the full remuneration negative phase-sequence.In addition, have and take static reacance generator DSTATCOM to be installed on the compensation scheme that the three-phase high-voltage side compensates negative phase-sequence and harmonic wave.Because the three-phase side electric pressure is up to 110kV or 220kV, DSTATCOM need be designed to the series multiplex structure, and structure is comparatively complicated, and is higher to the voltage and current class requirement of power electronic device, causes cost costliness and technology to realize that difficulty is bigger.

Summary of the invention

In order to solve existing the problems referred to above that exist based on the negative phase-sequence and the harmonic synthesis bucking-out system of railway power regulator, the invention provides a kind of electrified high-speed railway negative phase-sequence and harmonic synthesis bucking-out system.The present invention can improve negative phase-sequence and harmonic wave compensation effect, and can suitably reduce the device active capacity according to the negative sequence compensation index, reaches the purpose of improving compensation effect and reducing cost.

The technical scheme that the present invention solves the problems of the technologies described above is: comprise railway power regulator, described railway power regulator is installed between two supply arms of three-phase V/V tie lines traction transformer secondary side by single-phase three winding step-down transformers, it is characterized in that: the thyristor-controlled reactor (L that also comprises two groups of different parameters ₃, L ₄) and thyristor control high pass filter, the high pass filter of two groups of different parameters is respectively by reactor (L ₁) and capacitor (C ₁) and reactor (L ₂) and capacitor (C ₂) be composed in series, thyristor control high pass filter is installed under the single-phase three winding step-down transformers that are connected with the leading supply arm of voltage-phase, reactor L ₂Be installed under the single-phase three winding step-down transformers that are connected with another supply arm of voltage-phase hysteresis, the former limit of single-phase three winding step-down transformers is a winding, and secondary has two windings; Railway power regulator, thyristor control high pass filter and thyristor-controlled reactor are connected on respectively on two windings of single-phase three winding step-down transformer secondary.

A kind of electrified high-speed railway negative phase-sequence and harmonic synthesis bucking-out system, comprise railway power regulator, described railway power regulator is installed between two supply arms of three-phase V/V tie lines traction transformer secondary side by single phase step-down transformer, comprises the thyristor-controlled reactor (L of two groups of different parameters ₃, L ₄) and thyristor control high pass filter, the high pass filter section of thyristor control is respectively by reactor (L ₁) and capacitor (C ₁) and reactor (L ₂) and capacitor (C ₂) be composed in series, thyristor control high pass filter is installed under the single phase step-down transformer that is connected with the leading supply arm of voltage-phase, reactor L ₂Be installed under the single phase step-down transformer that is connected with another supply arm of voltage-phase hysteresis, each winding of former limit of single phase step-down transformer and secondary, railway power regulator and thyristor control high pass filter or the thyristor-controlled reactor secondary that inserts single phase step-down transformer in parallel.

Technique effect of the present invention is:

1) RPC can compensate certain negative phase-sequence but can not the full remuneration negative phase-sequence, two groups of thyristors control high pass filter and thyristor-controlled reactor can compensate on the basis of negative phase-sequence at RPC, can further improve the negative sequence compensation effect and realize the negative phase-sequence full remuneration, RPC can suppress the harmonic wave that the electric locomotive load produces in addition;

2) thyristor control high pass filter and thyristor-controlled reactor have the negative sequence compensation function, under same power quality index, can suitably reduce active device RPC capacity, reduce the cost of bucking-out system.

3) but thyristor control high pass filter filtering part high order harmonic component has improved harmonic suppression effect.

The present invention is further illustrated below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is the structure chart of the embodiment of the invention 1.

Fig. 2 is the structure chart of the embodiment of the invention 2.

Fig. 3 is negative sequence compensation current vector figure.Fig. 3 (a) is compensation three-phase current vector figure; Fig. 3 (b) RPC compensation back three-phase current vectogram; Fig. 3 (c) is that RPC, high pass filter and reactor all drop into back three-phase current vectogram.

Embodiment

Referring to Fig. 1, Fig. 1 is the structure chart of the embodiment of the invention 1.The thyristor control high pass filter 3 (TCHF) and the thyristor-controlled reactor 1 (TCR) of railway power regulator 2 (RPC), two groups of different parameters of formula constitute jointly back-to-back by one in the present invention 4.RPC is installed between two supply arms of three-phase V/v tie lines traction transformer secondary side by two single-phase three winding step-down transformers, thyristor control high pass filter is installed under two single-phase three winding step-down transformers that are connected with the leading supply arm of voltage-phase, thyristor-controlled reactor (L ₃, L ₄) be installed under two single-phase three winding step-down transformers that are connected with another supply arm of voltage-phase hysteresis.Comprise two current transformers that connect by common DC electric capacity among the RPC, two current transformers are connected to two supply arms of three-phase V/v tie lines traction transformer by output reactance and single-phase three winding step-down transformers.The thyristor control high pass filter of two groups of different parameters is respectively by reactor (L ₁) and capacitor (C ₁) and reactor (L ₂) and capacitor (C ₂) be composed in series.Thyristor in thyristor control high pass filter and the thyristor-controlled reactor only plays the switching effect, is equivalent to a fling-cut switch, and adopting thyristor to carry out switching is in order to guarantee that switching is rapid.

Referring to Fig. 2, Fig. 2 is the structure chart of the embodiment of the invention 2.Only replace single-phase three winding step-down transformers among the embodiment 1 among the embodiment 2 with single phase step-down transformer.

Two supply arms are given the electric locomotive power supply of high-speed railway uplink and downlink respectively.When a supply arm has electric locomotive operation and another arm when not having the electric locomotive operation, have only a supply arm to have electric current, another arm does not have electric current.From the three-phase side electric current I _A, I _B, I _CSee, have bigger negative-sequence current.According to the ruuning situation of electric locomotive, drop into the one group of high pass filter and the reactor of relevant parameter by thyristor control.Thyristor control high pass filter and thyristor-controlled reactor are installed in respectively under the supply arm of electric current lead and lag, because not only filtering part of high pass filter high order harmonic component, it is capacitive for fundamental frequency, can make this supply arm electric current leading; Thyristor-controlled reactor can make the electric current of its place supply arm more lag behind.The phase place of two supply arms has been increased from compensating 60 preceding degree, on the basis of RPC compensation negative phase-sequence, further improved the negative sequence compensation effect.For the harmonic wave that the electric locomotive load produces, RPC can send corresponding harmonic wave and remove to offset the harmonic wave that the electric locomotive load produces, thereby eliminates the harmonic wave in the net side.Simultaneously, the part high order harmonic component that thyristor control high pass filter can its place supply arm of filtering has further been improved the harmonic compensation effect.Therefore, this system can improve negative sequence compensation and harmonic suppression effect.Under same negative sequence compensation index, compare with independent RPC that active device RPC capacity obviously reduces in electrified high-speed railway negative phase-sequence and the harmonic synthesis bucking-out system.

Below in conjunction with figure

Further labor and its negative sequence compensation principle of explanation and thyristor are controlled the Parameters design of high pass filter and thyristor-controlled reactor.With three-phase side line voltage

Be benchmark.The high-speed railway electric locomotive is a four-quadrant PWM rectification control mode, has High Power Factor, the poor characteristics of low-order harmonic, and power factor approaches 1.

Before the compensation, suppose that a has the electric locomotive load mutually, the load current size is I _L, b does not have electric locomotive mutually.Because power factor approaches 1, a phase current phase place is consistent with voltage-phase.Because negative-sequence current is mainly first-harmonic, ignore harmonic wave when therefore analyzing negative-sequence current.So establish ${\stackrel{\→}{I}}_a=I_L,$ ${\stackrel{\→}{I}}_b=0,$ ${\stackrel{\→}{I}}_c=-{\stackrel{\→}{I}}_a,$ Compensation three-phase current vector figure is as figure

Shown in.

Three phase network side electric current I then _A, I _B, I _CBe respectively:

$\left\{\begin{array}{c}{\stackrel{\→}{I}}_A=-\frac{{\stackrel{\→}{I}}_a}{K}\\ {\stackrel{\→}{I}}_B=-\frac{{\stackrel{\→}{I}}_b}{K}\\ {\stackrel{\→}{I}}_C=-({\stackrel{\→}{I}}_A+{\stackrel{\→}{I}}_B)\end{array}\right.---\left(1\right)$

Introduce the complex operation factor-alpha, establish α=e ^{J120 °}, the computing formula of forward-order current and negative-sequence current is respectively:

${\stackrel{\&RightArrow;}{I}}_{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">A</figure-callout>}1}=\frac{1}{3}({\stackrel{\&RightArrow;}{I}}_A+\mathrm{\&alpha;}{\stackrel{\&RightArrow;}{I}}_B+{\mathrm{\&alpha;}}^2{\stackrel{\&RightArrow;}{I}}_C)---\left(2\right)$

${\stackrel{\&RightArrow;}{I}}_{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">A</figure-callout>}2}=\frac{1}{3}({\stackrel{\&RightArrow;}{I}}_A+{\mathrm{\&alpha;}}^2{\stackrel{\&RightArrow;}{I}}_B+\mathrm{\&alpha;}{\stackrel{\&RightArrow;}{I}}_C)---\left(3\right)$

Wherein

The expression forward-order current,

The expression negative-sequence current.

Definition $K_I=\frac{\left|{\stackrel{\&RightArrow;}{I}}_{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">A</figure-callout>}2}\right|}{\left|{\stackrel{\&RightArrow;}{I}}_{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">A</figure-callout>}1}\right|}$ Be the three-phase current unbalance degree, can calculate according to formula (1)-(3):

$K_I=\frac{\left|{\stackrel{\&RightArrow;}{I}}_{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">A</figure-callout>}2}\right|}{\left|{\stackrel{\&RightArrow;}{I}}_{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">A</figure-callout>}1}\right|}=\left|\frac{\frac{1}{3K}{I}_L(\mathrm{\&alpha;}-1)}{\frac{1}{3K}{I}_L({\mathrm{\&alpha;}}^2-1)}\right|=1$

As seen, there is bigger negative-sequence current in system before the compensation, and the negative-sequence current value is equal with the forward-order current value.

When RPC worked, RPC transferred to a phase with b phase active current, the amplitude unanimity that two supply arm electric currents change.If after the RPC work, a mutually with b mutually under the supply arm size of current be respectively I _aAnd I _bRPC is a power diverting device, RPC consumed power not under the situation of not considering its switching loss.Satisfy:

I _a+I _b＝I _L (4)

This moment the three-phase side electric current still with

As benchmark, then The three-phase current vectogram is as figure

Shown in.Can calculate according to formula (5)-(7), the negative-sequence current after the RPC compensation and the effective value of forward-order current are respectively:

$\left|{{\stackrel{\&RightArrow;}{I}}^{\&prime;}}_{A1}\right|=\left|\frac{1}{3}({{\stackrel{\&RightArrow;}{I}}^{\&prime;}}_A+\mathrm{\&alpha;}{{\stackrel{\&RightArrow;}{I}}^{\&prime;}}_B+{\mathrm{\&alpha;}}^2{{\stackrel{\&RightArrow;}{I}}^{\&prime;}}_C)\right|=\left|\frac{1}{3K}(-I_a+{\mathrm{\&alpha;}}^2{I}_b+{\mathrm{\&alpha;}}^2(I_a-\mathrm{\&alpha;}{I}_b))\right|$

$=\frac{1}{\sqrt{3}K}(I_a+I_b)---\left(5\right)$

$\left|{{\stackrel{\&RightArrow;}{I}}^{\&prime;}}_{A2}\right|=\left|\frac{1}{3}({{\stackrel{\&RightArrow;}{I}}^{\&prime;}}_A+{\mathrm{\&alpha;}}^2{{\stackrel{\&RightArrow;}{I}}^{\&prime;}}_B+\mathrm{\&alpha;}{{\stackrel{\&RightArrow;}{I}}^{\&prime;}}_C)\right|=\left|\frac{1}{3K}(-I_a+{\mathrm{\&alpha;}}^2\mathrm{\&alpha;}{I}_b+\mathrm{\&alpha;}(I_a-\mathrm{\&alpha;}{I}_b))\right|$

$=\frac{1}{\sqrt{3}K}\sqrt{{I_a}^2+{I_b}^2-I_a{I}_b}---\left(6\right)$

This moment, the three-phase current unbalance degree was:

${K_I}^{\&prime;}=\frac{\left|{\stackrel{\&RightArrow;}{I}}_{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">A</figure-callout>}2}\right|}{\left|{\stackrel{\&RightArrow;}{I}}_{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">A</figure-callout>}1}\right|}=\frac{\sqrt{{I_a}^2+{I_b}^2-I_a{I}_b}}{I_a+I_b}\&times;100\%---\left(7\right)$

Make b phase supply arm active current and a mutually the ratio of active current be n, then $n=\frac{I_b}{I_a},$ Then formula (8) can turn to:

${K_I}^{\&prime;}=\frac{\sqrt{1+n^2-n}}{1+n}---\left(8\right)$

From formula (9) as can be seen, work as n=1, promptly $I_a=I_b=\frac{1}{2}{I}_L$ The time, the three-phase current unbalance degree is obtained minimum value 50%, illustrate that system's negative-sequence current has reduced through after the RPC compensation, but still there is original half big or small negative-sequence current in system.At this moment, RPC active power is half of electric locomotive active power.

After one group that drops into by thyristor control in high pass filter and the reactor because high pass filter is capacitive, establish a phase supply arm current phase is dropped into after the high pass filter input before leading θ ₁Angle makes b phase current phase place drop into preceding hysteresis θ after the reactor input ₂Angle, the size of current of two supply arms is respectively I _aAnd I _b, the locomotive load current still is I _L, the relation according to active current has:

I _acosθ ₁+I _bcosθ ₂＝I _L (9)

Make b phase supply arm and a ratio of the active power of supply arm mutually: $n=\frac{I_b\cos {\mathrm{\&theta;}}_2}{I_a\cos {\mathrm{\&theta;}}_1},$ Substitution (9) can solve:

$\left\{\begin{array}{c}{I}_a=\frac{n{I}_L}{(n+1)\cos {\mathrm{\&theta;}}_1}\\ I_b=\frac{I_L}{(n+1)\cos {\mathrm{\&theta;}}_2}\end{array}\right.---\left(10\right)$

At this moment the three-phase current vectogram is shown in Fig. 2 (c).As can be seen, the angle between A, the B phase current increases to 60 °+θ by original 60 ° from Fig. 2 (c) ₁+ θ ₂, help eliminating negative phase-sequence like this.

By figure Can draw:

$\left\{\begin{array}{c}{\stackrel{\&RightArrow;}{I}}_A^{\&prime;\&prime;}=-\frac{I_a}{K}{e}^{j{\mathrm{\&theta;}}_1}\\ {\stackrel{\&RightArrow;}{I}}_B^{\&prime;\&prime;}=-\frac{I_b}{K}{e}^{j{\mathrm{\&theta;}}_2}\\ {\stackrel{\&RightArrow;}{I}}_C^{\&prime;\&prime;}=\frac{I_a}{K}{e}^{j{\mathrm{\&theta;}}_1}+\frac{I_b}{K}{e}^{j{\mathrm{\&theta;}}_2}\end{array}\right.---\left(11\right)$

Calculate three-phase current unbalance degree K this moment _I" be:

From formula (12) as can be seen, work as θ ₁=θ ₂=30 °, b and a be mutually during the ratio n=1 of active current, degree of unbalance K _I" be 0, do not have negative-sequence current in system's three-phase current.As seen, use high pass filter and reactor on the RPC compensated foundation, further to improve the negative phase-sequence effect, negative phase-sequence is eliminated fully.

If with three-phase current unbalance degree K _I=50% for the compensation target, works as θ ₁=θ ₂In the time of=15 °, then the active current of b phase only is 0.2865I _L, show that RPC has only shifted 0.2865 times of load current.And during by independent RPC compensation, needing to shift size be 0.5I _LActive current degree of unbalance could be reduced to 50%, the RPC capacity has just reduced by 42.69% like this.Therefore, use high pass filter and reactor, under same negative sequence compensation index, can reduce the capacity of active device RPC.

Therefore simultaneously, RPC can suppress system harmonics, and high pass filter has inhibitory action to high-frequency harmonic, compares with independent RPC, and the electrified high-speed railway negative phase-sequence can be improved a harmonic compensation effect of supply arm mutually with the harmonic synthesis bucking-out system.

The Parameters design of high pass filter and reactor is as follows:

Move when a phase supply arm has electric locomotive, when b phase supply arm did not have the electric locomotive operation, a dropped into high pass filter L by thyristor control ₁And C ₁, b drops into reactor L by thyristor control ₃If the electric current in the high pass filter is The supply arm magnitude of voltage is U _Ac, the no-load voltage ratio of two step-down windings of single-phase three winding step-down transformers or step-down transformer is K _t, then:

$\left|{\stackrel{\&RightArrow;}{I}}_1\right|=\frac{U_{\mathrm{ac}}/{\mathrm{<figure-callout\; id="1"\; label="K\; t"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">K</figure-callout>}}_t}{1/2\mathrm{\&pi;f}{C}_1-2\mathrm{\&pi;f}{L}_1}---\left(13\right)$

Wherein f is a fundamental frequency.

Other establishes high pass filter resonance at h (h＞1) subfrequency place, has:

$2\mathrm{\&pi;<figure-callout\; id="1"\; label="hf\; L"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">hf</figure-callout>}{L}_{}{}_1=\frac{1}{2\mathrm{\&pi;hf}{C}_1}---\left(14\right)$

From Fig. 2 (c) as can be known:

$\frac{\left|{\stackrel{\&RightArrow;}{I}}_1\right|}{K{K}_t}=\left|I_A^{\&prime;}\right|\mathrm{tg}{\mathrm{\&theta;}}_1=\frac{I_a\cos {\mathrm{\&theta;}}_1}{K}\mathrm{tg}{\mathrm{\&theta;}}_1---\left(15\right)$

Can try to achieve by formula (10), (13)-(15):

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">L</figure-callout>}}_1=\frac{U_{\mathrm{ac}}(n+1)}{2\mathrm{\&pi;f}(h^2-1){\mathrm{nI}}_L\mathrm{tg}{\mathrm{\&theta;}}_1{K_t}^2}\\ {\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">C</figure-callout>}}_1=\frac{(h^2-1)n{I}_L\mathrm{tg}{\mathrm{\&theta;}}_1{{\mathrm{<figure-callout\; id="2"\; label="K\; t"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">K</figure-callout>}}_t}^2}{2\mathrm{\&pi;f}{h}^2{U}_{\mathrm{ac}}(n+1)}\end{array}\right.---\left(16\right)$

Can draw in the thyristor control high pass filter wherein one group of inductance L according to formula (16) ₁And capacitor C ₁Parameter value.

If L in the reactor ₃Electric current be

Then:

$\left|{\stackrel{\&RightArrow;}{I}}_2\right|=\frac{\left|U_{\mathrm{bc}}\right|}{2\mathrm{\&pi;<figure-callout\; id="3"\; label="f\; L"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">f</figure-callout>}{L}_{}{}_3}=\frac{U_{\mathrm{ac}}/{\mathrm{<figure-callout\; id="2"\; label="K\; t"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">K</figure-callout>}}_t}{2\mathrm{\&pi;f}{L}_3}---\left(17\right)$

From figure

As can be known:

$\frac{\left|{\stackrel{\&RightArrow;}{I}}_2\right|}{K{K}_t}=\left|I_B^{\&prime;}\right|\mathrm{tg}{\mathrm{\&theta;}}_2=\frac{I_b\cos {\mathrm{\&theta;}}_2}{K}\mathrm{tg}{\mathrm{\&theta;}}_2---\left(18\right)$

Can get by formula (10), (17) and (18):

${\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">L</figure-callout>}}_3=\frac{(n+1){\mathrm{<figure-callout\; id="2"\; label="U\; ac"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">U</figure-callout>}}_{\mathrm{ac}}}{2\mathrm{\&pi;f}{I}_L\mathrm{tg}{\mathrm{\&theta;}}_2{K_t}^2}---\left(19\right)$

Can obtain in the thyristor-controlled reactor wherein one group of inductance L according to formula (19) ₃Parameter.When electric locomotive is positioned at b phase supply arm, because load current still is I _L, RPC still shifts the active current of identical size, and then the ratio of the active current in a, the b phase current is

Drop into high pass filter L by thyristor control this moment ₂And C ₂With reactor L ₄, in like manner, can obtain its parameter:

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">L</figure-callout>}}_2=\frac{U_{\mathrm{ac}}(n+1)}{2\mathrm{\&pi;f}(h^2-1)I_L\mathrm{tg}{\mathrm{\&theta;}}_1{K_t}^2}\\ {\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">C</figure-callout>}}_2=\frac{(h^2-1)I_L\mathrm{tg}{\mathrm{\&theta;}}_1{{\mathrm{<figure-callout\; id="2"\; label="K\; t"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">K</figure-callout>}}_t}^2}{2\mathrm{\&pi;f}{h}^2{U}_{\mathrm{ac}}(n+1)}\end{array}\right.---\left(20\right)$

${\mathrm{<figure-callout\; id="4"\; label="L"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">L</figure-callout>}}_4=\frac{(n+1){\mathrm{<figure-callout\; id="2"\; label="U\; ac"\; filenames="A20091004355300142.png"\; state="\{\{state\}\}">U</figure-callout>}}_{\mathrm{ac}}}{2\mathrm{\&pi;fn}{I}_L\mathrm{tg}{\mathrm{\&theta;}}_2{K_t}^2}---\left(21\right)$

Another group parameter value in thyristor control high pass filter and the thyristor-controlled reactor can be obtained in through type (20) and (21).

Claims (4)

1, a kind of electrified high-speed railway negative phase-sequence and harmonic synthesis bucking-out system, comprise railway power regulator, described railway power regulator is installed between two supply arms of three-phase V/V tie lines traction transformer secondary side by single-phase three winding step-down transformers, it is characterized in that: the thyristor-controlled reactor (L that also comprises two groups of different parameters ₃, L ₄) and thyristor control high pass filter, the high pass filter of two groups of different parameters is respectively by reactor (L ₁) and capacitor (C ₁) and reactor (L ₂) and capacitor (C ₂) be composed in series, thyristor control high pass filter is installed under the single-phase three winding step-down transformers that are connected with the leading supply arm of voltage-phase, reactor L ₂Be installed under the single-phase three winding step-down transformers that are connected with another supply arm of voltage-phase hysteresis, the former limit of single-phase three winding step-down transformers is a winding, and secondary has two windings; Railway power regulator, thyristor control high pass filter and thyristor-controlled reactor are connected on respectively on two windings of single-phase three winding step-down transformer secondary.

2, electrified high-speed railway negative phase-sequence according to claim 1 and harmonic synthesis bucking-out system is characterized in that, the parameter of described two groups of thyristors control high pass filter and thyristor-controlled reactor is respectively:

$\left\{\begin{array}{c}{L}_1=\frac{U_{\mathrm{ac}}(n+1)}{2\mathrm{\&pi;f}(h^2-1){\mathrm{nI}}_L\mathrm{tg}{\mathrm{\&theta;}}_1{K}_t^2}\\ C_1=\frac{(h^2-1)n{I}_L\mathrm{tg}{\mathrm{\&theta;}}_1{K}_t^2}{2\mathrm{\&pi;}{\mathrm{fh}}^2{U}_{\mathrm{ac}}(n+1)}\end{array}\right.$ $\left\{\begin{array}{c}{L}_2=\frac{U_{\mathrm{ac}}(n+1)}{2\mathrm{\&pi;f}(h^2-1)I_L\mathrm{tg}{\mathrm{\&theta;}}_1{K}_t^2}\\ C_2=\frac{(h^2-1)I_L\mathrm{tg}{\mathrm{\&theta;}}_1{K}_t^2}{2\mathrm{\&pi;}{\mathrm{fh}}^2{U}_{\mathrm{ac}}(n+1)}\end{array}\right.$

$L_3=\frac{(n+1)U_{\mathrm{ac}}}{2\mathrm{\&pi;}{\mathrm{fI}}_L\mathrm{tg}{\mathrm{\&theta;}}_2{K}_t^2}$ $L_4=\frac{(n+1)U_{\mathrm{ac}}}{2\mathrm{\&pi;}{\mathrm{fnI}}_L\mathrm{tg}{\mathrm{\&theta;}}_2{K}_t^2}$

θ in the above-mentioned formula ₁For a phase supply arm current phase after the high pass filter input drops into preceding leading angle, θ ₂Be hysteresis angle before b phase current phase place is dropped into, I _aAnd I _bBe respectively the electric current of a phase, b phase, I _LBe the locomotive load current, n is b and the ratio of a active power mutually, and h is the harmonic frequency number of times, U _AcBe supply arm voltage, K _tNo-load voltage ratio for step-down transformer.

3, a kind of electrified high-speed railway negative phase-sequence and harmonic synthesis bucking-out system, comprise railway power regulator, described railway power regulator is installed between two supply arms of three-phase V/V tie lines traction transformer secondary side by single phase step-down transformer, it is characterized in that: the thyristor-controlled reactor (L that also comprises two groups of different parameters ₃, L ₄) and thyristor control high pass filter, the high pass filter section of thyristor control is respectively by reactor (L ₁) and capacitor (C ₁) and reactor (L ₂) and capacitor (C ₂) be composed in series, thyristor control high pass filter is installed under the single phase step-down transformer that is connected with the leading supply arm of voltage-phase, reactor L ₂Be installed under the single phase step-down transformer that is connected with another supply arm of voltage-phase hysteresis, each winding of former limit of single phase step-down transformer and secondary, railway power regulator and thyristor control high pass filter or the thyristor-controlled reactor secondary that inserts single phase step-down transformer in parallel.

4, electrified high-speed railway negative phase-sequence according to claim 3 and harmonic synthesis bucking-out system is characterized in that, the parameter of described two groups of thyristors control high pass filter and thyristor-controlled reactor is respectively:

$\left\{\begin{array}{c}{L}_1=\frac{U_{\mathrm{ac}}(n+1)}{2\mathrm{\&pi;f}(h^2-1){\mathrm{nI}}_L\mathrm{tg}{\mathrm{\&theta;}}_1{K}_t^2}\\ C_1=\frac{(h^2-1)n{I}_L\mathrm{tg}{\mathrm{\&theta;}}_1{K}_t^2}{2\mathrm{\&pi;}{\mathrm{fh}}^2{U}_{\mathrm{ac}}(n+1)}\end{array}\right.$ $\left\{\begin{array}{c}{L}_2=\frac{U_{\mathrm{ac}}(n+1)}{2\mathrm{\&pi;f}(h^2-1)I_L\mathrm{tg}{\mathrm{\&theta;}}_1{K}_t^2}\\ C_2=\frac{(h^2-1)I_L\mathrm{tg}{\mathrm{\&theta;}}_1{K}_t^2}{2\mathrm{\&pi;}{\mathrm{fh}}^2{U}_{\mathrm{ac}}(n+1)}\end{array}\right.$

$L_3=\frac{(n+1)U_{\mathrm{ac}}}{2\mathrm{\&pi;}{\mathrm{fI}}_L\mathrm{tg}{\mathrm{\&theta;}}_2{K}_t^2}$ $L_4=\frac{(n+1)U_{\mathrm{ac}}}{2\mathrm{\&pi;}{\mathrm{fnI}}_L\mathrm{tg}{\mathrm{\&theta;}}_2{K}_t^2}$

θ in the above-mentioned formula ₁For a phase supply arm current phase after the high pass filter input drops into preceding leading angle, θ ₂Be hysteresis angle before b phase current phase place is dropped into, I _aAnd I _bBe respectively the electric current of a phase, b phase, I _LBe the locomotive load current, n is b and the ratio of a active power mutually, and h is the harmonic frequency number of times, U _AcBe supply arm voltage, K _tNo-load voltage ratio for step-down transformer.

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