CN103928928B - A kind of high-speed railway quality of power supply and supply conductor voltage comprehensive compensation system - Google Patents

Abstract

The present invention provides a kind of high-speed railway quality of power supply and supply conductor voltage comprehensive compensation system, this comprehensive compensation system include the single-phase back-to-back STATCOM compensation device being arranged on traction substation traction side and be arranged on subregion thuristor throw-in and throw-off high pass filter；Single-phase back-to-back STATCOM compensation device low-order harmonic filtering, power factor and Traction networks busbar voltage in negative sequence compensation, 2 11 underranges controls；Thuristor throw-in and throw-off high pass filter is used for absorbing the higher hamonic wave of more than 11 times, stablizes Traction networks terminal voltage.The single-phase back-to-back STATCOM device of this system, detects the power factor of traction substation, output that dynamic step-less adjustment is idle in real time, maintains system power factor more than 0.9；The high pass filter of thuristor throw-in and throw-off set by subregion, for absorbing the harmonic current of more than 11 times, improves supply conductor voltage.Whole system has the advantages such as floor space is little, running wastage is little, construction costs is low, reliability is high, technology realizes simply, comprehensive benefit is prominent.

Description

A kind of high-speed railway quality of power supply and supply conductor voltage comprehensive compensation system

Technical field

The present invention relates to a kind of high-speed railway traction power supply, Power Electronic Technique and the system in power quality controlling field, specifically relate to And a kind of high-speed railway quality of power supply and supply conductor voltage comprehensive compensation system.

Background technology

The advantages such as high-speed railway is fast with its speed of service, freight volume is big, energy-conserving and environment-protective, safety and comfort, comprehensive benefit are prominent, are subject to The attention of countries in the world, develops the rapidest.At present, China Express Railway revenue kilometres, more than 10,000 kilometers, occupy the world One.According to planning, to the year two thousand twenty, Speed 200 km/h and above high speed passenger dedicated railway 1.6 ten thousand kilometers will be built up.

High-speed railway all uses electric propulsion mode, accesses 220kV power transmission network for its most traction substations powered, Serious power quality problem is brought to electrical network.Relative to run the common electrical railway of DC locomotive, high-speed railway Impact on the electrical network quality of power supply has the newest feature: one is that negative phase-sequence problem is the most prominent, and high-speed electric railway locomotive is transported Line speed is high, and the traction power of locomotive increases along with the increase exponentially of speed, and 16 to be grouped in 350 kilometers of speed per hour Trains total Installed capacity, up to 29500kVA, adds employing V/V traction power supply mode, injects substantial amounts of negative-sequence current to electrical network, simultaneously Locomotive uses regenerative braking, to electrical network feedback power, causes power supply buses Voltage unbalance and voltage pulsation；Two is harmonic problem Increasingly complex, AC-DC-AC locomotive uses PWM control mode, substantially reduces low-order harmonic content, but due to locomotive first-harmonic electricity Stream is greatly increased, and the absolute value of its low-order harmonic injecting electrical network is the most considerable.Additionally, locomotive network side harmonic current frequency spectrum adds Width, reaches as high as a few kHz, and higher harmonic current enriches, according to existing quality of power supply national standard, high-speed railway traction power transformation Understood and the phenomenon that all odd harmonic electric currents exceed standard simultaneously in the range of 3～25 subharmonic is occurred simultaneously.The problems referred to above will give electrical network, Other users and the power supply safety of high-speed railway self and reliability bring the biggest impact, bring the most also to the improvement of the quality of power supply New challenge.

High-speed electric railway locomotive is higher than common electrical railway to the requirement of power supply reliability, the specified fortune of EMU Row voltage range is 25kV to 29kV, and when voltage drops to 22.5kV to 25kV scope, pull strength is down to rated power 90%, in other voltage ranges, pull strength would fall to 0；Additionally, high-speed railway is high to the over-zone feeding Capability Requirement of supply arm, Require to be capable of over-zone feeding under accident conditions, it is allowed to all train passes through fault supply arm under deceleration conditions.In order to protect Card transport capacity and the safety of EMUs, Traction networks supply voltage level must assure that in rational scope.Root it was found that due to High-speed railway Traction networks load current is big, and the voltage drop that Traction networks equiva lent impedance causes accounts for the 67% of comprehensive pressure drop, compensates traction The voltage drop that net causes is for improving EMUs running environment, ensureing that locomotive operation safety, raising transport power have important practical significance.

For the harmonic wave of above-mentioned high-speed railway, negative phase-sequence, supply conductor voltage problem, have taken up various indemnifying measure both at home and abroad, Including fixed parallel capacitor compensation device (Fixed Capacitor, FC), SVC (Static Var Compensator, SVC) and STATCOM (Static Synchronous Compensator, STATCOM).Peace It is contained in tractive transformer on high-tension side three-phase SVC device to can be used to compensate negative phase-sequence and low-order harmonic electric current, is arranged on tractive transformer Low-pressure side or subregion single-phase SVC device may be used to compensate power factor, low-order harmonic and supply conductor voltage, but due to SVC Device itself also produces harmonic wave, not only have impact on electrical network and load, also affects it and compensates performance, causes system filter requirement and damage Consumption increases.

STATCOM device have employed pulse width modulation (PWM) control, transient current detection technique and multiple inverter configuration, due to work Making in voltage source converter pattern, the capacity of its bridge-type convertor circuit DC side energy-storage travelling wave tube is more than the harmonic wave that can be provided by and first-harmonic Capacity is little, and for SVC device, needed for it, the capacity of energy-storage travelling wave tube at least will be equal to its required harmonic wave provided with without power capacity Amount, therefore in STATCOM device, volume and the cost of energy-storage travelling wave tube are greatly reduced than the SVC of same capacity, and compensate performance and sound Speed is answered to be superior to SVC.STATCOM device is when tractive transformer three-phase side is installed, it is possible to preferably compensate negative phase-sequence and low order is humorous Ripple electric current, when using balance traction transformer to power, installs two single-phase STATCOM device DC sides in traction side and is connected structure (Japanese scholars is referred to as railway power regulator RPC, Railway Static Power to become back-to-back STATCOM device Conditioner), utilize this device can gain merit two supply arms, idle and harmonic wave is controlled, and makes the load of two supply arms Moment is in poised state, thus realizes negative phase-sequence, idle comprehensive compensation, compensates 3,5,7 inferior low orders to a certain extent Harmonic current, stablizes supply conductor voltage, is a kind of preferable compensation way of combination property.It is limited to the switching frequency of device, RPC Device can only limited compensation low-order harmonic electric current, then can not compensate for higher hamonic wave.

Owing in high-speed railway traction load, harmonic current frequency spectrum is wider, FC or SVC device is used to carry out needing during harmonic wave control to arrange Multiple LC passive filtering branch roads, first-harmonic capacitive reactive power electric current inevitably flows through each branch road of wave filter, due to high speed motor car Group power factor under various operating modes is higher, and unnecessary capacitive reactive power is unnecessary, but makes the capacity of device, loss increase, Whole device is set up Thyristor Controlled Reactor branch road and device volume will be caused huge and produce extra harmonic current source.Additionally, Knowable to the service chart of current high-speed railway, the effective run time of each high ferro circuit every day the most early 6 to point in evening 24, Other periods are idle time, be not required to compensation device and play a role in this period, and FC or SVC is a kind of continuous service dress Put, not only increase equipment loss, make the average power factor of traction substation reduce the most further, add operating cost.

STATCOM dynamic, realize Continuous Compensation negative phase-sequence and idle in real time and rapidly, stably while traction busbar voltage, Active power filtering function can also be realized, be suitable for the compensation of the fast reactive of high-speed railway traction load, negative phase-sequence and harmonic wave；Owing to answering STATCOM device electric pressure for high-speed railway power quality controlling is high, compensation capacity big, be limited by switching device loss, The factors such as device radiation, the switching frequency of its high-power switch device can not be the highest, actual application is mainly used in 2～11 times humorous The improvement of ripple electric current, then cannot effective compensation for higher hamonic wave.

Therefore it provides the comprehensive compensation system of a kind of energy compensated high-speed railway electric energy quality and supply conductor voltage is significant.

Summary of the invention

In order to overcome the defect of above-mentioned prior art, the present invention proposes a kind of energy compensated high-speed railway electric energy quality and supply conductor voltage Comprehensive compensation system, i.e. single-phase back-to-back STATCOM device is set in traction substation traction side, compensate negative phase-sequence and 2～ 11 subharmonic currents, by detecting the power factor of traction substation, output that dynamic step-less adjustment is idle in real time, maintain system merit Rate factor is more than 0.9；At the high pass filter of thuristor throw-in and throw-off set by relevant partitions, for absorbing the harmonic wave of more than 11 times Electric current, improves supply conductor voltage simultaneously, and whole system has that floor space is little, running wastage is little, construction costs is low, reliability High, technology realizes the advantages such as simple, comprehensive benefit is prominent.

In order to realize foregoing invention purpose, the present invention adopts the following technical scheme that:

A kind of high-speed railway quality of power supply and supply conductor voltage comprehensive compensation system, the electric power system of described high-speed railway includes being connected Power system, tractive transformer, traction bus and Traction networks；Described Traction networks include contact line, rail, positive feeder and from Coupling transformator；Described traction bus one and traction bus two are respectively by tractive transformer one and tractive transformer two and described electric power System connects；Described traction bus one and traction bus two connect described Traction networks by feeder line one and feeder line two respectively；Described connect Touch between line with rail, be connected by autotransformer respectively between rail and positive feeder；It thes improvement is that: described comprehensively Compensation system includes the single-phase back-to-back STATCOM compensation device being arranged on described traction substation traction side and is arranged on described Subregion thuristor throw-in and throw-off high pass filter；

Described single-phase back-to-back STATCOM compensation device low-order harmonic in negative sequence compensation, 2-11 underrange filters, merit Rate factor and busbar voltage control；

Described thuristor throw-in and throw-off high pass filter is used for absorbing the higher hamonic wave of more than 11 times, stablizes Traction networks terminal voltage.

Further, described thuristor throw-in and throw-off high pass filter includes fling-cut switch and the high pass filter being connected, and described switching is opened Pass includes two anti-parallel thyristors, and described high pass filter includes capacitor C and the reactor L, described reactor L of series connection In parallel with resistor R；

Described thuristor throw-in and throw-off high pass filter be installed on subregion contact line and center line between and positive feeder and center line between respectively Installing, two described subregions arrange 4 set thuristor throw-in and throw-off high pass filters altogether.

Further, described single-phase back-to-back STATCOM device includes connecting with described traction bus one and traction bus two respectively The isolating transformer one connect and isolating transformer two, described isolating transformer one and isolating transformer two connect current transformer one He respectively Current transformer two, described current transformer one is connected by DC capacitor with current transformer two, forms back-to-back symmetrical structure, described current transformer One is connected with controller respectively with current transformer two.

Further, described isolating transformer one is single-phase multiwinding transformer, the secondary limit winding of described single-phase multiwinding transformer It is connected with multiple single-phase electricity source converter in parallel；

Described isolating transformer two is single-phase two-winding transformer, is used for realizing multiple single-phase electricity potential source converter stage connection output voltage With the voltage matches of traction bus two, and current transformer two is made to realize electrical isolation with traction bus two.

Further, the compensation method of described single-phase back-to-back STATCOM device comprises the following steps:

The secondary port of the tractive transformer one of order traction bus one correspondence is port I, the tractive transformer of traction bus two correspondence The secondary port of two is port II, and locomotive load is connected on described port I and port II respectively, and two-port wiring angle is respectively Ψ₁、 Ψ₂, corresponding two supply arm traction load capacity are respectively S_L1And S_L2, power-factor angle is respectivelyWithHarmonic component It is respectively i_L1h、i_L2h；

The current transformer one of described single-phase back-to-back STATCOM device and the AC of current transformer two are respectively by isolating transformer one Accessing described port I and port II with isolation transformation two, the compensation of described port I and port II is meritorious and idle is respectively P_C1、 Q_C1And P_C2、Q_C2；

Before compensating, described traction substation injection electrical network negative-sequence current isElectrical network power transformer station allow negative-sequence current be I^-, then Negative sequence compensation redundancy isCompensating rear haulage transformer primary side remaining three-phase positive sequence reactive power isCompensate Front reactive power isThen reactive-load compensation redundancy beAccording to V/v tractive transformer former limit negative-sequence current with The relation of secondary two supply arm traction load, for realizing the negative sequence compensation under V/v traction power supply mode, can be according to such as following formula (1) Determine single-phase back-to-back STATCOM device compensation capacity:

In formula (1), S_LyFor the apparent energy of supply arm, matrix B such as following formula (2):

$B=\left[\begin{array}{cccc}[1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)]& -\sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& \cos 2{\mathrm{\Ψ}}_1-\cos 2{\mathrm{\Ψ}}_2& \sin 2{\mathrm{\Ψ}}_1-\sin 2{\mathrm{\Ψ}}_2\\ [1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)]& \sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& -\cos 2{\mathrm{\Ψ}}_1+{\cos 2\mathrm{\Ψ}}_2& -\sin 2{\mathrm{\Ψ}}_1+\sin 2{\mathrm{\Ψ}}_2\\ \sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& [1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)]& -\sin 2{\mathrm{\Ψ}}_1+\sin 2{\mathrm{\Ψ}}_2& \cos 2{\mathrm{\Ψ}}_1-\cos 2{\mathrm{\Ψ}}_2\\ -\sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& [1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)]& {\sin 2\mathrm{\Ψ}}_1-\sin 2{\mathrm{\Ψ}}_2& -\cos 2{\mathrm{\Ψ}}_1+\cos {2\mathrm{\Ψ}}_2\end{array}\right]---\left(2\right)$

The power determined by formula (1), can be according to the back-to-back STATCOM of traction substation two as described in determining such as following formula (3) The compensation current instantaneous value of AC:

$\left\{\begin{array}{c}{i}_{C1}^{*}=\sqrt{2}\frac{P_{C1}}{U_1}\sin U_1+\sqrt{2}\frac{Q_{C1}}{U_1}\cos U_1-i_{L1h}^{*}\\ i_{C2}^{*}=\sqrt{2}\frac{P_{C2}}{U_2}\sin U_2+\sqrt{2}\frac{Q_{C2}}{U_2}\cos U_2-i_{L2h}^{*}\end{array}\right.---\left(3\right)$

In formula,Current instantaneous value is compensated for the back-to-back STATCOM device in supply arm side,Back-to-back for supply arm two side STATCOM device compensates current instantaneous value,For supply arm side traction load harmonic component,Lead for supply arm two side Drawing Load harmonic component, overtone order value is at 11 times and less；

U₁、U₂It is respectively supply arm one and the voltage of supply arm two, sinU₁、sinU₂、cosU₁、cosU₂It is respectively supply arm One and the phase-locked sine obtained of supply arm two voltage and cosine signal.

Further, the compensation method of described thyristor switched filter device comprises the following steps:

The fundamental wave reactive power that the capacity of described high pass filter is used for absorbed harmonic current size and required compensation is relevant, makes locomotive Load point is Z=R+jX to impedance of traction electric network between tractive transformer, and Secondary Side of Traction Transformer floating voltage is V₀, represent band and carry Voltage is V_R, traction load active power is P_L, reactive power is Q_L, the first-harmonic of described thyristor switched filter device without Merit power is Q_C, as following formula (4) determines Traction networks drops rate ε (%):

$\mathrm{\ϵ}=\frac{V_0-V_R}{V_0}\×100=\frac{1}{{V_0}^2}\×[P_{L}R+(Q_L-Q_C)X]\×100---\left(4\right)$

According to supply conductor voltage rate of descent ε, determine the First Harmonic Reactive Power Q needing high pass filter to provide_C, work as Q_CMeet as follows During the relation of formula (5), supply conductor voltage fall determines that full remuneration is such as following formula (5):

$Q_C=Q_L+\frac{R}{X}{P}_L---\left(5\right)$

Wherein, the capacitance of bivalent high-pass filter determines according to following formula (6):

$C=\frac{Q_C}{2\mathrm{\π}{f}_0{V}^2}---\left(6\right)$

In formula, V is supply conductor voltage；

The cut-off frequency f of bivalent high-pass filter₀Determine according to following formula (7):

$f_0=\frac{1}{2\mathrm{\πCR}}---\left(7\right)$

Filtering characteristic parameter m determines according to following formula (8):

$m=\frac{L}{R^{2}C}---\left(8\right)$

When filtering the harmonic wave of more than 11 times, quality factor span is between 0.5～2, determines according to above formula (4)～(8) The parameter value of R, L, C of high pass filter.

Further, described antiparallel IGCT one and antiparallel IGCT two automatically engage or out of service for realization.

Further, described thyristor switched filter device absorbs the higher harmonic current of more than 11 times, is used for improving Traction networks Quality of voltage and suppression higher harmonic resonance cause net pressure unusual fluctuations.

Compared with prior art, the beneficial effects of the present invention is:

1, the system of the present invention uses and installs single-phase back-to-back STATCOM device in traction substation traction side, in relevant partitions institute Installing thuristor throw-in and throw-off high pass filter mode, the most single-phase back-to-back STATCOM device compensates 11 times and following low-order harmonic, Subregion institute thuristor throw-in and throw-off high pass filter absorbs the higher harmonic current of more than 11 times, can be real in the range of wider harmonic spectrum The now effective compensation to high ferro brushes for traction motors.

2, the single-phase back-to-back STATCOM device of the traction substation of the system of the present invention uses modular construction, can not improve out Close effective compensation low-order harmonic electric current in the case of frequency, reduce device loss；The negative phase-sequence of electrical network is injected in effectively suppression Traction Station Electric current, effectively reduces the negative phase-sequence impact of high ferro Load on Electric Power Grid, simultaneously by detecting the power factor of traction substation in real time, dynamic The perception of its output of state step-less adjustment or capacitive reactive power, maintain system power factor more than 0.9.

3, the high pass filter of the used thuristor throw-in and throw-off of the subregion of the system of the present invention, can be automatic according to the load condition of Traction networks Putting into or exit, absorbing traction load higher harmonic current on the spot, suppression higher harmonic resonance causes supply conductor voltage unusual fluctuations, Also act as stable contact net network voltage at tail end, improve Traction networks over-zone feeding ability, the effect of raising capacity.Use thuristor throw-in and throw-off Mode can put without locomotive fashionable dress at night and automatically exit from running, it is possible to decrease the running wastage of whole compensation system, improve system and put down All power factors.

4, the system of the present invention is fully counted when calculating system balance capacity and electrical network is powered the negative-sequence current of transformer station and harmonic wave electricity Stream ability to bear, it is contemplated that the undulatory property feature of high-speed railway, by analyzing long term monitoring data, counts supply arm load The regularity of distribution, compensates the optimization of capacity, can on the premise of the Traction Station injected system quality of power supply meets standard limited value, Reduce the capacity of compensation device to greatest extent, reduce construction costs.

5, in the system of the present invention, the high pass filter of thuristor throw-in and throw-off is arranged on subregion institute, it is achieved during identical Control of Voltage target, Compared with the technical scheme that existing supply conductor voltage control device is typically mounted on traction substation, required benefit when being arranged on subregion institute Repay capacity and be about arranged on the half of traction substation, be greatly reduced the installed capacity of fundamental wave reactive power.

6, the system of the present invention have that floor space is little, running wastage is little, construction costs is low, reliability is high, technology realize simple, The advantages such as the suitability is strong, comprehensive benefit highlights, and had both been suitable for the high ferro Traction Station that negative-sequence current is big and harmonic spectrum is wide in range and has administered, also It is applicable to common electrical railway and the heavy haul railway of negative phase-sequence and harmonic excess.

Accompanying drawing explanation

Fig. 1 is the high-speed railway quality of power supply and supply conductor voltage comprehensive compensation system wiring diagram；

Fig. 2 is the single-phase back-to-back STATCOM device wiring diagram of traction substation；

Fig. 3 is subregion institute thuristor throw-in and throw-off high pass filter wiring diagram；

Fig. 4 is the harmonic current extracting method schematic diagram that the back-to-back STATCOM of traction substation compensates；

Fig. 5 is single-phase back-to-back STATCOM device entirety control block diagram；

Wherein, the single-phase back-to-back STATCOM device of 1-traction substation, the bivalent high-pass filter I of 2-thuristor throw-in and throw-off, The two of bivalent high-pass filter III, the 5-thuristor throw-in and throw-off of bivalent high-pass filter II, the 4-thuristor throw-in and throw-off of 3-thuristor throw-in and throw-off The single-phase multiwinding transformer of rank high pass filter IV, 6-, the single-phase two-winding transformer of 7-, 8-parallel single-phase current transformer group, 9-is single-phase Chain type current transformer group, 10-DC capacitor, 11-150Hz resonance filter, 12-250Hz resonance filter, 13-350Hz resonance Wave filter, 14-450Hz resonance filter, 15-550Hz resonance filter, 16-back-to-back STATCOM current transformer, 17- Supply arm one side converter control block diagram；18-supply arm two side converter control block diagram.

Detailed description of the invention

The invention will be further described below in conjunction with the accompanying drawings.

The electric power system of high-speed railway includes power system, tractive transformer, traction bus and the Traction networks being connected；Traction networks bag Include contact line T, rail R, positive feeder F and autotransformer AT；Traction bus includes drawing bus one and traction bus two.

Traction bus one and traction bus two are connected with described power system by tractive transformer T1 and tractive transformer T2；Lead Draw bus one and traction bus two all connects Traction networks by feeder line one and feeder line two.Traction substation connects contact line T and ground Between；Described traction bus one and traction bus two connect described Traction networks by feeder line one and feeder line two respectively；Described contact line with Between rail, it is connected by autotransformer AT respectively between rail and positive feeder.

The high-speed railway quality of power supply and supply conductor voltage comprehensive compensation system wiring diagram as it is shown in figure 1, in the present embodiment, high-speed iron The road quality of power supply and supply conductor voltage comprehensive compensation system include being arranged on described traction substation traction side single-phase back-to-back STATCOM compensation device and be arranged on described subregion thuristor throw-in and throw-off high pass filter；

Described single-phase back-to-back STATCOM compensation device low-order harmonic in negative sequence compensation, 2-11 underrange filters, merit Rate factor and busbar voltage control；

Described thuristor throw-in and throw-off high pass filter is used for absorbing the higher hamonic wave of more than 11 times, stablizes Traction networks terminal voltage.

As it is shown in figure 1, Fig. 1 is the high-speed railway quality of power supply and supply conductor voltage comprehensive compensation system wiring diagram；Power system is led to Cross antiparallel IGCT one and antiparallel IGCT two branch connects traction bus one and traction bus two, draw bus one He Traction bus two is all connected with Traction networks；Traction networks includes contacting line T, center line and positive feeder F, logical between contact line T and center line The high pass filter crossing thuristor throw-in and throw-off connects, and is connected by the high pass filter of thuristor throw-in and throw-off between center line with positive feeder F； Traction bus one and traction bus two are connected by single-phase back-to-back STATCOM device.Phase between traction bus one and Traction networks Even for supply arm one, be connected between traction bus two and Traction networks for supply arm two.

The high pass filter of thuristor throw-in and throw-off includes fling-cut switch and the high pass filter being connected, and described fling-cut switch includes two instead IGCT T1, T2 in parallel, described high pass filter includes that the capacitor C connected and reactor L, described reactor L are with electric Resistance device R is in parallel.

Traction substation single-phase back-to-back STATCOM device includes being connected with described traction bus one and traction bus two respectively Isolating transformer one and isolating transformer two, described isolating transformer one and isolating transformer two connect current transformer one and unsteady flow respectively Device two, described current transformer one is connected by DC capacitor with current transformer two, forms back-to-back symmetrical structure, current transformer one and unsteady flow Device two is connected with controller respectively.Isolating transformer one is single-phase multiwinding transformer, and single-phase multiwinding transformer realizes multiple list Phase H bridge current transformer is in parallel, forms current transformer one；Current transformer two forms for the cascade of single-phase H bridge current transformer group.Parallel single-phase unsteady flow The H bridge current transformer of device group is connected by DC capacitor with the H bridge current transformer of single-phase chain type current transformer group.

Isolating transformer one is single-phase multiwinding transformer, and isolating transformer two is single-phase two-winding transformer, current transformer (VSC) One is parallel single-phase current transformer group, and current transformer (VSC) two is parallel single-phase current transformer group.

Fig. 1 isolates in the single-phase back-to-back STATCOM device of traction substation transformation one and VSCI and isolating transformer two Composition and wiring in detail with VSCII are as shown in Figure 2；This device includes the isolation in single-phase i.e. Fig. 1 of multiwinding transformer 6( Transformator one), by n the H bridge current transformer composition parallel single-phase current transformer group 8 that n vice-side winding of transformator 6 is in parallel (i.e. VSCI in Fig. 1), common n the chain link being connected by n DC capacitor 10 and n single-phase cascade converter group 8 VSCII in single-phase i.e. Fig. 1 of chain type current transformer group 9(), the AC port of this single-phase chain type current transformer group 9 and single-phase double winding Isolating transformer two in transformator 7(i.e. Fig. 1) it is connected.Device is respectively by terminal x, y of single-phase multiwinding transformer 6 Being connected to draw bus with terminal z, w of single-phase two-winding transformer 7, each H bridge current transformer all uses based on self-turn-off device (IGBT, IGCT etc.) are constituted.

Subregion the high pass filter I2 of thuristor throw-in and throw-off, the high pass filter II3 of thuristor throw-in and throw-off, the high pass of thuristor throw-in and throw-off Wave filter III4, the composition of high pass filter IV5 of thuristor throw-in and throw-off and connect main wiring diagram in detail as it is shown on figure 3, this IGCT The high pass filter of switching is constituted fling-cut switch by two antiparallel IGCT T1, T2, high pass filter include capacitor C, Reactor L, resistor R are constituted, and wherein, reactor L is in parallel with resistor R, reactor L and capacitor C in series.Point District positive feeder and center line between and contact the high pass filter being respectively mounted thuristor throw-in and throw-off between line and center line, two subregions Installing 4 sets altogether, the rated voltage of every covering device is 27.5kV.

The compensation principle of the high pass filter of the back-to-back STATCOM device of above-mentioned traction substation and thuristor throw-in and throw-off and embodiment party Formula is as follows:

1, the compensation principle of the single-phase back-to-back STATCOM device of traction substation and embodiment

(1) the single-phase back-to-back STATCOM device of traction substation

The secondary port of the tractive transformer T1 of order traction bus one correspondence is port I, the traction voltage transformation of traction bus two correspondence The secondary port of device T2 is port II, makes locomotive load be connected on tractive transformer T1 and the secondary of tractive transformer T2 respectively Side ports I and port II, two-port wiring angle (i.e. the angle of Secondary Side of Traction Transformer voltage delay former limit A phase positive sequence voltage, Delayed is just) it is respectively Ψ₁、Ψ₂, the traction load electric current of supply arm 1 and supply arm 2 is respectively i_L1、i_L2Middle corresponding two supply Electric arm traction load capacity is respectively S_L1And S_L2, power-factor angle is respectivelyWithHarmonic component is respectively i_L1h、i_L2h。 Single-phase back-to-back STATCOM two AC side of converter is respectively connected to port 1 and port 2, and port compensates meritorious and idle difference For P_C1、Q_C1And P_C2、Q_C2.Assume that compensating front haulage electric substation injection electrical network negative-sequence current is simultaneouslyElectrical network is powered change Power station allows negative-sequence current to be I^-, then negative sequence compensation redundancy isCompensate rear haulage transformer primary side remaining three Phase positive sequence reactive power isBefore compensating, reactive power isThen reactive-load compensation redundancy beAccording to V/v Tractive transformer former limit negative-sequence current and the relation of secondary two supply arm traction load, for realizing bearing under V/v traction power supply mode Sequence compensates, and can obtain single-phase back-to-back STATCOM device compensation capacity formula is:

Formula (1) S_LyFor the apparent energy of supply arm, when designing final compensation capacity, S_LyValue need to be by monitoring number for a long time Drawing according to statistics, and statistical time range should include the typical condition that high ferro is run, in formula (1), matrix B is:

$B=\left[\begin{array}{cccc}[1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)]& -\sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& \cos 2{\mathrm{\Ψ}}_1-\cos 2{\mathrm{\Ψ}}_2& \sin 2{\mathrm{\Ψ}}_1-\sin 2{\mathrm{\Ψ}}_2\\ [1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)]& \sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& -\cos 2{\mathrm{\Ψ}}_1+{\cos 2\mathrm{\Ψ}}_2& -\sin 2{\mathrm{\Ψ}}_1+\sin 2{\mathrm{\Ψ}}_2\\ \sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& [1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)]& -\sin 2{\mathrm{\Ψ}}_1+\sin 2{\mathrm{\Ψ}}_2& \cos 2{\mathrm{\Ψ}}_1-\cos 2{\mathrm{\Ψ}}_2\\ -\sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& [1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)]& {\sin 2\mathrm{\Ψ}}_1-\sin 2{\mathrm{\Ψ}}_2& -\cos 2{\mathrm{\Ψ}}_1+\cos {2\mathrm{\Ψ}}_2\end{array}\right]---\left(2\right)$

The odd harmonic that the harmonic current that the single-phase back-to-back STATCOM device of traction substation compensates is mainly between 2-11 time, The harmonic current extracting method schematic diagram that the back-to-back STATCOM of traction substation compensates as shown in Figure 4, is filtered by 5 resonance Ripple device, from traction load electric current i_L1、i_L2In extract 3,5,7,9,11 inferior harmonic components of required compensation, it is entered Row is added, and obtains the required harmonic current command value compensated of two ACs of single-phase back-to-back STATCOM device $i_{L1h}^{*}=\underset{h=\mathrm{3,5,7,9,11}}{\mathrm{\Σ}}{i}_{L1h},i_{L2h}^{*}=\underset{h=\mathrm{3,5,7,9,11}}{\mathrm{\Σ}}{i}_{L2h.}$

The power calculated by formula (1), can obtain the compensation electric current of traction substation back-to-back STATCOM two AC Instantaneous value such as following formula (3):

$\left\{\begin{array}{c}{i}_{C1}^{*}=\sqrt{2}\frac{P_{C1}}{U_1}\sin U_1+\sqrt{2}\frac{Q_{C1}}{U_1}\cos U_1-i_{L1h}^{*}\\ i_{C2}^{*}=\sqrt{2}\frac{P_{C2}}{U_2}\sin U_2+\sqrt{2}\frac{Q_{C2}}{U_2}\cos U_2-i_{L2h}^{*}\end{array}\right.---\left(3\right)$

Wherein,Current instantaneous value is compensated for the back-to-back STATCOM device in supply arm 1 side,Back-to-back for supply arm 2 side STATCOM device compensates current instantaneous value.U₁、U₂It is respectively supply arm 1 and the voltage of supply arm 2, sinU₁、sinU₂、 cosU₁、cosU₂, be respectively supply arm 1 and the phase-locked sine obtained of voltage of supply arm 2 and cosine signal.

(2) control mode of the single-phase back-to-back STATCOM device of traction substation is as follows:

Flow between two supply arms for realizing active power, it is ensured that stablizing of DC voltage, be necessary for selecting the unsteady flow of side Device uses constant DC voltage control strategy, as long as keeping DC voltage constant, then ensure that the meritorious with defeated of two side converter inputs Go out is meritorious equal, thus realizes active power from side supply arm to the transfer of opposite side supply arm.

As it is shown in figure 5, Fig. 5 is single-phase back-to-back STATCOM device entirety control block diagram, the current transformer group on the left side is selected to become The outer ring controller of stream device one uses constant DC voltage control mode, and each winding of transformator is individually for each power H bridge and powers, Individually control DC voltage.The outer shroud of right side current transformer group current transformer two uses fixed meritorious output control mode, and its reference current is such as Shown in formula (3)Thus realize the balance of tractive transformer secondary two-arm active power.

The internal ring of two side converters all uses the triangular modulation mode controlled based on instantaneous value electric current, has Control system architecture letter Single, current response rate is fast, controls not use circuit parameter in computing, the advantages such as system robustness is good.

2, the compensation principle of subregion institute thuristor throw-in and throw-off filter and embodiment

(1) subregion institute thuristor throw-in and throw-off filter

The bivalent high-pass filter that subregion institute thuristor throw-in and throw-off filter is made up of R, L, C, by two antiparallel crystalline substances Brake tube T1 and T2 realizes automatically engaging or out of service, and this device mainly absorbs 11 times and above higher harmonic current, Also have and improve supply conductor voltage quality and suppress higher harmonic resonance to cause the effect of net pressure unusual fluctuations.

At two subregion in T-N, F-N between need respectively to set a set of RLC bivalent high-pass filter, 4 sets are set altogether, this high pass filter The specified cut-off overtone order of ripple device is about 10 times.

(2) compensation principle of subregion institute thuristor throw-in and throw-off filter

The capacity of high pass filter mainly fundamental wave reactive power by the harmonic current size absorbed and required compensation is relevant.Locomotive is made to bear Lotus point is Z=R+jX to impedance of traction electric network between tractive transformer, and Secondary Side of Traction Transformer floating voltage is V₀, represent band and carry electricity Pressure is V_R, load active power is P_L, reactive power is Q_L, wave filter First Harmonic Reactive Power is Q_C, then Traction networks drops Rate ε (%) can be expressed as follows:

$\mathrm{\ϵ}=\frac{V_0-V_R}{V_0}\×100=\frac{1}{{V_0}^2}\×[P_{L}R+(Q_L-Q_C)X]\×100---\left(4\right)$

From above formula, the First Harmonic Reactive Power Q needing high pass filter to provide can be determined according to supply conductor voltage rate of descent ε_C, Work as Q_CWhen meeting the relation such as following formula (5), supply conductor voltage fall can be fully compensated:

$Q_C=Q_L+\frac{R}{X}{P}_L---\left(5\right)$

According to above formula (5), making supply conductor voltage is V, and the capacitance trying to achieve bivalent high-pass filter is:

$C=\frac{Q_C}{2\mathrm{\π}{f}_0{V}^2}---\left(6\right)$

The cut-off frequency f of bivalent high-pass filter₀As following formula (7) determines:

$f_0=\frac{1}{2\mathrm{\πCR}}---\left(7\right)$

The filtering performance of high pass filter is also relevant to filtering characteristic parameter m, as shown in following formula (8):

$m=\frac{L}{R^{2}C}---\left(8\right)$

When being generally used for the harmonic wave filtering more than 11 times, quality factor span is between 0.5～2.

In conjunction with above formula (4)～(8), tri-parameter values of R, L, C of high pass filter can be tried to achieve.

Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although reference The present invention has been described in detail by above-described embodiment, those of ordinary skill in the field it is understood that still can to this Invention detailed description of the invention modify or equivalent, and without departing from spirit and scope of the invention any amendment or etc. With replacing, it all should be contained in the middle of scope of the presently claimed invention.

Claims (6)

1. the high-speed railway quality of power supply and a supply conductor voltage comprehensive compensation system, the electric power system of described high-speed railway includes phase Power system, tractive transformer, traction bus and Traction networks even；Described Traction networks include contact line, rail, positive feeder and Autotransformer；Traction bus one and traction bus two are respectively by tractive transformer one and tractive transformer two and described power train System connects；Described traction bus one and traction bus two connect described Traction networks by feeder line one and feeder line two respectively；Described contact Between line with rail, it is connected by autotransformer respectively between rail and positive feeder；It is characterized in that: described comprehensive compensation system System includes being arranged on the single-phase back-to-back STATCOM compensation device of traction substation traction side and is arranged on the IGCT throwing of subregion institute Cut high pass filter；

Described single-phase back-to-back STATCOM compensation device low-order harmonic in negative sequence compensation, 2-11 underrange filters, power Factor and busbar voltage control；

Described thuristor throw-in and throw-off high pass filter is used for absorbing the higher hamonic wave of more than 11 times, stablizes Traction networks terminal voltage；

Described single-phase back-to-back STATCOM device includes the isolation transformation being connected respectively with described traction bus one and traction bus two Device one and isolating transformer two, described isolating transformer one and isolating transformer two connect current transformer one and current transformer two, institute respectively State current transformer one to be connected by DC capacitor with current transformer two, form back-to-back symmetrical structure, described current transformer one and current transformer two It is connected with controller respectively；

The compensation method of described single-phase back-to-back STATCOM device comprises the following steps:

The secondary port of the tractive transformer one of order traction bus one correspondence is port I, the tractive transformer of traction bus two correspondence The secondary port of two is port II, and locomotive load is connected on described port I and port II respectively, and two-port wiring angle is respectively Ψ₁、 Ψ₂, corresponding two supply arm traction load capacity are respectively S_L1And S_L2, power-factor angle is respectivelyWithHarmonic component It is respectively i_L1h、i_L2h；

The current transformer one of described single-phase back-to-back STATCOM device and the AC of current transformer two are respectively by isolating transformer one He Isolating transformer two accesses described port I and port II, and the compensation of described port I and port II is meritorious and idle is respectively P_C1、 Q_C1And P_C2、Q_C2；

Before compensating, described traction substation injection electrical network negative-sequence current isElectrical network power transformer station allow negative-sequence current be I^-, then Negative sequence compensation redundancy isCompensating rear haulage transformer primary side remaining three-phase positive sequence reactive power isCompensate Front reactive power isThen reactive-load compensation redundancy beAccording to V/v tractive transformer former limit negative-sequence current with The relation of secondary two supply arm traction load, for realizing the negative sequence compensation under V/v traction power supply mode, can be according to such as following formula (1) Determine single-phase back-to-back STATCOM device compensation capacity:

In formula (1), S_LyFor the apparent energy of supply arm, matrix B such as following formula (2):

$B=\left[\begin{array}{cccc}\[1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)\]& -\sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& \cos 2{\mathrm{\Ψ}}_1-\cos 2{\mathrm{\Ψ}}_2& \sin 2{\mathrm{\Ψ}}_1-\sin 2{\mathrm{\Ψ}}_2\\ \[1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)\]& \sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& -\cos 2{\mathrm{\Ψ}}_1+\cos 2{\mathrm{\Ψ}}_2& -\sin 2{\mathrm{\Ψ}}_1+\sin 2{\mathrm{\Ψ}}_2\\ \sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& \[1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)\]& -\sin 2{\mathrm{\Ψ}}_1+\sin 2{\mathrm{\Ψ}}_2& \cos 2{\mathrm{\Ψ}}_1-\cos 2{\mathrm{\Ψ}}_2\\ -\sin 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)& \[1-\cos 2({\mathrm{\Ψ}}_1-{\mathrm{\Ψ}}_2)\]& \sin 2{\mathrm{\Ψ}}_1-\sin 2{\mathrm{\Ψ}}_2& -\cos 2{\mathrm{\Ψ}}_1+\cos 2{\mathrm{\Ψ}}_2\end{array}\right]---\left(2\right)$

The power determined by formula (1), can be according to the single-phase back-to-back STATCOM of traction substation as described in determining such as following formula (3) The compensation current instantaneous value of device two AC:

$\left\{\begin{array}{c}{i}_{C1}^{*}=\sqrt{2}\frac{P_{C1}}{U_1}{\mathrm{sinU}}_1+\sqrt{2}\frac{Q_{C1}}{U_1}{\mathrm{cosU}}_1-i_{L1h}^{*}\\ i_{C2}^{*}=\sqrt{2}\frac{P_{C2}}{U_2}{\mathrm{sinU}}_2+\sqrt{2}\frac{Q_{C2}}{U_2}{\mathrm{cosU}}_2-i_{L2h}^{*}\end{array}\right.---\left(3\right)$

In formula,Current instantaneous value is compensated for the single-phase back-to-back STATCOM device in supply arm side,Single-phase for supply arm two side STATCOM device compensates current instantaneous value back-to-back,For supply arm side traction load harmonic component,For supply arm two Side-lining Load harmonic component, overtone order value is at 11 times and less；

U₁、U₂It is respectively supply arm one and the voltage of supply arm two, sinU₁、sinU₂、cosU₁、cosU₂It is respectively power supply Arm one and the phase-locked sine obtained of supply arm two voltage and cosine signal.

2. a kind of high-speed railway quality of power supply as claimed in claim 1 and supply conductor voltage comprehensive compensation system, it is characterised in that: Described thuristor throw-in and throw-off high pass filter includes fling-cut switch and the high pass filter being connected, and described fling-cut switch includes two the most also Connection IGCT, described high pass filter includes the capacitor C and reactor L of series connection, and described reactor L is in parallel with resistor R；

Described thuristor throw-in and throw-off high pass filter be installed on subregion contact line and center line between and positive feeder and center line between respectively Installing, two described subregions arrange 4 set thuristor throw-in and throw-off high pass filters altogether.

3. a kind of high-speed railway quality of power supply as claimed in claim 1 and supply conductor voltage comprehensive compensation system, it is characterised in that: Described isolating transformer one is single-phase multiwinding transformer, the secondary limit winding of described single-phase multiwinding transformer and multiple lists in parallel Phase voltage source current transformer connects；

Described isolating transformer two is single-phase two-winding transformer, is used for realizing multiple single-phase electricity potential source converter stage connection output voltage With the voltage matches of traction bus two, and current transformer two is made to realize electrical isolation with traction bus two.

4. a kind of high-speed railway quality of power supply as claimed in claim 3 and supply conductor voltage comprehensive compensation system, it is characterised in that: The compensation method of described thuristor throw-in and throw-off high pass filter device comprises the following steps:

The fundamental wave reactive power that the capacity of described high pass filter is used for absorbed harmonic current size and required compensation is relevant, makes locomotive Load point is Z=R '+jX to impedance of traction electric network between tractive transformer, and Secondary Side of Traction Transformer floating voltage is V₀, represent band Load voltage is V_R, traction load active power is P_L, reactive power is Q_L, described thuristor throw-in and throw-off high pass filter device First Harmonic Reactive Power is Q_C, as following formula (4) determines Traction networks drops rate ε (%):

$\mathrm{\ϵ}=\frac{V_0-V_R}{V_0}\×100=\frac{1}{V_0^2}\×\[P_L{R}^{\′}+(Q_L-Q_C)X\]\×100---\left(4\right)$

According to supply conductor voltage rate of descent ε, determine the First Harmonic Reactive Power Q needing high pass filter to provide_C, work as Q_CMeet as follows During the relation of formula (5), supply conductor voltage fall can be fully compensated:

$Q_C=Q_L+\frac{R^{\′}}{X}{P}_L---\left(5\right)$

Wherein, the capacitance of bivalent high-pass filter determines according to following formula (6):

$C=\frac{Q_C}{2{\mathrm{\πf}}_0{V}^2}---\left(6\right)$

In formula, V is supply conductor voltage；

The cut-off frequency f of bivalent high-pass filter₀Determine according to following formula (7):

$f_0=\frac{1}{2\mathrm{\π}CR}---\left(7\right)$

Filtering characteristic parameter m determines according to following formula (8):

$m=\frac{L}{R^{2}C}---\left(8\right)$

When filtering the harmonic wave of more than 11 times, quality factor span is between 0.5～2, determines according to above formula (4)～(8) The parameter value of R, L, C of high pass filter.

5. a kind of high-speed railway quality of power supply as claimed in claim 1 and supply conductor voltage comprehensive compensation system, it is characterised in that: Antiparallel IGCT one and antiparallel IGCT two automatically engage or out of service for realization.

6. a kind of high-speed railway quality of power supply as claimed in claim 1 and supply conductor voltage comprehensive compensation system, it is characterised in that: Described thuristor throw-in and throw-off high pass filter device absorbs the higher harmonic current of more than 11 times, be used for improving supply conductor voltage quality with Suppression higher harmonic resonance causes net pressure unusual fluctuations.