CN102707163A - Experimental station for detecting silicon controlled valve bank - Google Patents

Abstract

The invention relates to an experimental station for testing a thyristor valve bank, in particular to an all-round experimental station which is invented for the purpose of testing the thyristor valve bank. Based on the power semiconductor technology, the device can be used as an equivalent current source and a voltage source of a positive and negative parallel silicon controlled valve bank and can be used for carrying out experiments on the valve bank. The main connections of the experimental station are: the tested thyristor valve group is connected with an equipotential bus and a grounding bus, a voltage oscillation circuit is connected with the equipotential bus, a current circuit is connected between the equipotential bus and the grounding bus, and the current circuit consists of an alternating current voltage source, a current-limiting reactor, a main thyristor valve group and an auxiliary thyristor valve group. The auxiliary thyristor valve bank is connected in parallel with a loop with a secondary winding of a series transformer and a current-limiting reactor, and the loop ensures the starting of a voltage oscillation loop and the safety protection of the main thyristor valve bank when the valve bank for providing voltage to the thyristor by a driving plate is tested. The experiment station can be used for carrying out experiments on the unidirectional asymmetric silicon controlled valve bank and the bidirectional symmetric silicon controlled valve bank.

Description

Be used for the experiment centre that the thyristor valve group detects

Technical field

This invention is in the electric power specialty, to be the basis with the power semiconductor technology, can treat as positive inverse parallel thyristor valve group TCR, and the equivalent current source of asynchronous machine soft start and other equipment and voltage source use, and it is experimentized.

Background technology

The experiment that is used for thyristor valve group TCR as everyone knows detects (Baoliang Sheng, Senior Member, IEEE; Marcio Oliveira, Member, IEEE; Hans-Ola Bjarme, " Synthetic Test Circuits for the Operational Tests of TCR and TSC Thyristor Valves " .-IEEE-PES T&D Conference, Chicago; Illinois; USA, April 21-22,2008); (see figure 1) comprises being used to connect thyristor valve group (Vt1 to be detected ₊/ Vt1 _-) ground strap and equipotential bus, and voltage oscillation loop (Cs, L1 и Va3/Va4), current return (G/Lg, Ls, Va1 are arranged ₊/ Va1 _-, Arrester, Filter banks и Shunt banks) and impact loop (Imp.Gen); Direct voltage source (DC Source); Be connected capacitor C2 and other of direct voltage source (DC Source) output terminal.

This experiment table has a lot of deficiencies and shortcoming under following situation.If the alternating-current voltage source G/Lg in the current return is in low-pressure side, the Vt1 of thyristor valve group to be detected ₊/ Vt1 _-Through drive plate energy is provided, alternating voltage is obtained by RC protection loop on the controllable silicon, so can't the trigger voltage oscillation circuit owing to begin most not have energy on the drive plate.And, be high voltage so be difficult to make alternating-current voltage source G/Lg because the equipment in the current return can't accomplished all is high-power (Filter banks, Shunt banks and Ls) and guarantee that its output voltage is corresponding with thyristor valve group voltage to be detected.Undoubtedly will address this problem just must be at thyristor valve group Vt1 to be detected ₊One of/Vt1 parallel connection is not with the auxiliary thyristor valve group of drive plate, and this valve group is used for the voltage oscillation loop start.When experimentizing, also must give on the drive plate of thyristor valve group to be detected and give alternating voltage.Thyristor valve to be detected is afterwards devoted oneself to work, and this auxiliary thyristor valve group is then out of service.And this has increased another difficult problem.In addition, as thyristor valve group Va1 ₊/ Va1 _-The lightning arrester (Arrester) that under control situation out of control, is used for mesolow side former device over-voltage in protective current loop in the experiment table current return must be powerful, illustrates, such as dropping into the moment of impacting the loop.

Summary of the invention

The object of the present invention is to provide a kind of experiment centre that the thyristor valve group detects that is used for, this test experience stands in when having simplified equipment, has improved the safe operation of experiment greatly.

For realizing above-mentioned purpose, the present invention realizes through following technical scheme:

A kind of thyristor valve group test experience station that is used for includes: the ground strap and the equipotential bus that are used to connect thyristor valve group to be detected; Direct voltage source; Be connected the capacitor of DC voltage source output terminal; Be connected the voltage oscillation loop on the equipotential bus; Be connected the current return between ground strap and the equipotential bus; Be in series with alternating-current voltage source in this loop; Current limiting reactor and main thyristor valve group; In current return, also comprise an auxiliary thyristor valve group, auxiliary thyristor valve group is to be parallel with the loop that has series transformer Secondary Winding and current limiting reactor; Said auxiliary thyristor valve group is made up of just antiparallel controllable silicon and threshold circuit, and input end is connected in parallel on controllable silicon power and extremely goes up, and output terminal extremely links to each other with silicon controlled control.In addition, the threshold circuit energy is provided by sensor.

Main thyristor valve group in the patent of our application in the current return and auxiliary thyristor valve group trigger voltage oscillation circuit and work simultaneously with seized side valve group when experimentizing, disconnected the cutting of alternating-current voltage source this moment do not dropped into.Main thyristor valve group and auxiliary thyristor valve group are out of service when drive plate on thyristor valve group to be detected has obtained the alternating voltage of permission work, and seized side valve group is carried out duty.Promptly starting experiment table experimentizes.Dropping into alternating-current voltage source and voltage oscillation loop afterwards works with the current return that has main thyristor valve group simultaneously.The voltage of auxiliary thyristor valve group is not more than 1kv, except that above-mentioned functions, will accomplish that also controlling thyristor valve group out of control or auxiliary when main thyristor valve group loses under the situation of control signal superpotential is protected.Threshold circuit work afterwards, and make the components and parts safe operation of current return mesolow side, sensor sends all thyristor valve groups of signal block and cuts off alternating-current voltage source at this moment.If folk prescription is experimentized to asymmetric thyristor valve group, voltage oscillation loop controllable silicon opposite direction function when overcharging is accomplished by silicon controlled main rectifier valve group in the current return and auxiliary thyristor valve group self.

The invention has the beneficial effects as follows: this test experience stands in the safe operation that also improves it when having simplified experiment table equipment greatly.Should all can experiment centre be that purpose is invented so that the thyristor valve group is experimentized.Be the basis with the power semiconductor technology, can use as the equivalent current source and the voltage source of positive inverse parallel thyristor valve group, and the valve group is experimentized.Auxiliary thyristor valve group is to be parallel with the loop that has series transformer Secondary Winding and current limiting reactor, and this loop is the startup and the mainly safeguard protection of thyristor valve group that ensures to voltage oscillation loop when providing the valve group of voltage to experimentize by drive plate to controllable silicon.Experiment centre can experimentize to asymmetric thyristor valve group and twocouese symmetry thyristor valve group to folk prescription.

Description of drawings

Fig. 1 is the main electrical schematic diagram of experiment centre of the present invention;

Fig. 2 is the auxiliary thyristor valve group electrical schematic diagram in the current return;

Fig. 3 is a sequential chart of applying for a patent experiment centre;

Comprise in the experiment station owner electrical schematic diagram: ground strap 1 and equipotential bus 2, thyristor valve group 3 to be detected, direct voltage source 4, the first group capacitors 5; Voltage oscillation loop 6, rectification link 7, current return 8; Impact loop 9, distributed capacitance loop 10, first protection reactor 11 and second protection reactor 12; Control system 13, voltage transformer (VT) 14, first current transformer 15 and second current transformer 16.Thyristor valve group 3 to be detected is the valve groups that become by positive inverse parallel Group of Silicon Controlled Rectifier, and the controllable silicon positive dirction is 17, is 18 in the other direction; I.e. control input positive dirction is 17; Be 18 in the other direction, importing positive dirction with the control of thyristor valve group 3 to be detected is 3+, is that 3-is corresponding in the other direction.Direct voltage source 4 has anodal PV at output terminal, negative pole NV and zero utmost point MV, and it is to be v by having first diode 19 and second diode 20 and a winding _N(t) autotransformer 21 is formed.Promptly; First output terminal of the Secondary Winding of autotransformer 21 is connected first sun---the positive terminal of cloudy diode 19; Second output terminal of its Secondary Winding is connected negative electrode---and the negative pole end of anode diode 20, a winding voltage of autotransformer 21 is system voltage v _N(t); First output terminal of secondary side winding is that sun---cloudy form links to each other with anodal PV through first diode 19 structures; Through second diode 20 structure is cloudy---positive form links to each other with negative pole NV, and second output terminal of Secondary Winding links to each other with zero utmost point MV.First group capacitor 5 has anodal PV; Negative pole NV and zero utmost point MV; It is made up of 22 and 23 two unit; Guarantee being connected of first output terminal of first unit 22 and second output terminal of second unit 23 correspondingly with anodal PV and negative pole NV, second output terminal of first unit 22 and first output terminal of second unit 23 are connected with zero utmost point MV.Voltage oscillation loop 6 is in series with second group capacitor 24; Reactor 25 and first thyristor valve group 26; First thyristor valve group 26 is made up of positive dirction controllable silicon 27 and opposite direction controllable silicon 28, and 26 thyristor valve group positive dirctions of voltage oscillation loop 6 inputs place are designated 6+ and are designated 6-in the other direction.Rectification link 7 has output OUT, and anodal PV and negative pole NV include second thyristor valve group 29 and 30, the second thyristor valve groups 29 of the 3rd thyristor valve group and the 3rd thyristor valve group 30 is made up of with diode 32 just antiparallel controllable silicon 31.The negative electrode of the anode of controllable silicon 31 and diode 32 is thyristor valve group 29 (30) first output terminals in the rectification link 7 as a loop, and the anode of the negative electrode of controllable silicon 31 and diode 32 is second output terminal of the thyristor valve group 29 (30) in the rectification link 7 as a loop; But the output terminal OUT of rectification link 7 is connected with second output of second thyristor valve group 29 and first output terminal of the 3rd pressure valve group 30, and anodal PV is connected with second output terminal of thyristor valve group 30 with first output of thyristor valve group 29 with negative pole NV.31 controllable silicon positive dirctions in the rectification link 7 in Unit 29 are designated 7+, and the negative direction in Unit 30 is designated 7-.Include the alternating-current voltage source of series connection in the current return 8, promptly transformer 33, current limiting reactor 34 and main thyristor valve group 35, and this valve group 35 is become by positive inverse parallel Group of Silicon Controlled Rectifier, and positive dirction is designated 36, in the other direction for being designated 37; Auxiliary thyristor valve group 38, this valve group is become by positive inverse parallel Group of Silicon Controlled Rectifier, and positive dirction is designated 39, is designated 40 in the other direction; Here the first side winding of transformer 33 is v with having voltage _NOpening and 41 be connected (t); Auxiliary thyristor valve group 38 is to be parallel with the loop that has series transformer 33 Secondary Winding and current limiting reactor 34 relations; The control input end positive dirction of main thyristor valve group 35 is 36, is 37 in the other direction, and the control input positive dirction in the current return 8 is 8+, is 8-in the other direction; The control input end positive dirction of auxiliary thyristor valve group 38 is 39, is 40 in the other direction, and the control input end positive dirction of auxiliary thyristor valve group 38 is 8d in the current return, is 8b in the other direction.Impacting loop 9 has current impulse to form device (potential pulse formation device).Control system 13 is by simulation---and the components and parts that numeral has program chip constitute.Direct voltage source 4 and first group capacitor, 5 polarity correspond to each other is connected (PV, MV, and NV).The zero utmost point MV of first group capacitor 5 is connected with ground strap 1 through second current transformer 16 with direct voltage source 4, and is connected with rectification link 7 according to corresponding polarity (PV and NV) with second protection reactor 12 through first protection reactor 11.The output terminal OUT of rectification link 7 is connected with equipotential bus 2 by voltage oscillation loop 6.First output terminal and the equipotential bus 2 of current return 8 join, and second output terminal links to each other with ground strap 1 through first current transformer 15.Thyristor valve group 3 to be detected is impacted loop 9 and distributed capacitance loop 10 and is connected between equipotential bus 2 and the ground strap 1.Voltage transformer (VT) 14 output terminals are connected with the input end of control system 13, and the input terminal voltage of voltage transformer (VT) 14 is v _N(t), the output terminal of the output terminal of first current transformer 15 and second current transformer 16 is connected with the input end of control system 13, the control input end of thyristor valve group 3 to be detected, voltage oscillation loop 6; Their signal of rectification link 7 and current return 8 is respectively with 3+, 3-, 6+; 6-, 7+, 7-; 8+, 8-, 8d and 8b represent and metering-in control system.In addition the output state of the drive plate READY on the thyristor valve group 3 to be detected; The state of the protection output FAULT of auxiliary thyristor valve group 38 and the ON/OFF of the switch in current return 8 41 is the input end of metering-in control system 13 also, and the input end of the switch 41 in the OFF of control output end and the current return 8 links to each other.

In Fig. 2 concrete description the auxiliary thyristor valve group 38 on current return 8.Auxiliary thyristor valve group 38 includes: the loop that positive inverse parallel controllable silicon constitutes, and positive dirction controllable silicon 39, controllable silicon 40 is connected in parallel on the RC protection loop 42 on controllable silicon 39 and 40 in the other direction; Threshold circuit 43; First drive plate 44 and second drive plate 45, the controllable silicon of their output terminal and positive dirction 39 and in the other direction 40 controllable silicon be connected and it carried out the control transformation of p-n.First drive plate 44 on the auxiliary thyristor valve group 38 and the input end of second drive plate 45 are respectively control positive dirction 39 controllable silicons and 40 silicon controlled input signal 8d and 8b are corresponding in the other direction; C1 and C2 are respectively the input end of positive and negative controllable silicon negative electrode in the threshold circuit 43, and first output terminal G1 and second output terminal G2 link to each other with control output, and maintenance is consistent with positive dirction controllable silicon 39 and opposite direction controllable silicon 40.Comprise also that in threshold circuit 43 two protection loops are respectively 46 and 47; Diode rectification loop 48,49, two diodes of sensor are respectively 50 and 51; BOD---diode 52 and first resistance 53; And first input end of C1 is connected with the positive dirction of first diode 50 in the threshold loop 43, first resistance 53, the ac output end (～) in diode rectification loop 48 and second diode 51 on opposite direction with threshold loop 43 in second input end on the C2 be connected. Protection loop 46 and 47 all includes electric capacity 54; The 3rd diode 55; First stabilivolt 56 and second resistance 57; In first protection loop 46 and second protection loop 47 electric capacity 54 with 57 parallel connections of second resistance first diode 50 and second diode 51, be connected on negative electrode and first stabilivolt 56 opposite directions, protect on the 3rd diode 55 positive dirctions on the loop 46 and 47 to link to each other with second output terminal G2 with first output terminal G1 of threshold circuit 43.The positive output (+) in diode rectification loop 48 and its negative output (-) are through BOD---diode 52 with link to each other in the input of sensor 49 in positive dirction.Sensor 49 comprises 58, the four resistance 59 of the 3rd resistance and 60, the second stabilivolts of the 5th resistance 61 and Fibre Optical Sensor 62, and Fibre Optical Sensor is that protection is exported signal FAULT's on the auxiliary thyristor valve group 38 of transmission; Input end at sensor 49 has the 3rd resistance 58, and the positive dirction of the 4th resistance 59 and second stabilivolt 61 series connection in the other direction are in series with the 5th resistance 60 and Fibre Optical Sensor 62 on the just antiparallel stabilivolt 61 on this shunt circuit.

In the sequential chart of Fig. 3: e (t)---the electromotive force in voltage oscillation loop; Equate with voltage on first unit 22 on first group capacitor 5 or second unit 23, and the voltage on second group capacitor 24 E is ordered on Fig. 1 when the protection reactor inductance value is zero voltage and v _E(t) identical with e (t), V here _S---the amplitude voltage on first group capacitor 5 on positive dirction or the negative direction, E _V---the electromotive force of voltage oscillation loop rectification under steady-working state; i _V(t)---the current return in the voltage oscillation loop 6, t here _V---the pulse step size of electric current; v ₂₄(t)---the voltage on second group capacitor 24, V here ₀, V ₁, V ₄And V ₅---on second group capacitor 24 at time t ₀, t ₁, t ₄And t ₅On magnitude of voltage; v ₂₁(t)---the voltage on autotransformer 21 Secondary Winding; v ₂₂(t) and v ₂₃(t)---the voltage on first unit 22 of first group capacitor 5 and second unit 23, Δ V here _S---the sparking voltage value of first unit 22 or second unit 23; i _C(t) and i _T(t)---the current value and the seized side valve group 3 corresponding current values of current return 8; v _C(t) and v _T(t)---voltage and seized side valve group 3 corresponding voltage, V here on the current return 8 _M---under the steady-working state of voltage oscillation loop, turn-off valve group 3 to be detected superpotential amplitude at this moment; 3 ₊With 3 _-, 6 ₊With 6 _-, 7 ₊With 7 _-, 8 ₊With 8 _-, 8 _dWith 8 _b---be gating pulse, these pulse signals respectively with seized side valve group 3, voltage oscillation loop 6, rectification link 7 and current return 8 on positive dirction (+, d) with in the other direction on (, b) corresponding; T---the real time; t ₀, t ₁, t ₂...---the time read point.Watch for ease and in sequential chart, do not demonstrate i when cutting off the thyristor valve group _C(t), i _V(t) and i _T(t) opposite direction current spike.V in sequential chart 3 ₂₁(t), v ₂₂(t) and v ₂₃(t) be the equal proportion up-sizing.

Our experiment table carries out testing by following order: the output end voltage signal of voltage transformer (VT) 14 is v _N(t), the output terminal of first current transformer 15 has the current signal i of current return 8 _C(t), and the electric current that has in the voltage oscillation loop 6 of the output terminal of second current transformer 16 be i _V(t) the common metering-in control system 13 of signal is as carrying out work synchronously.Control wave in the control system 13 is respectively 3 ₊, 3 _-, 6 ₊, 6 _-, 7 ₊, 7 _-, 8 ₊, 8 _-, 8 _bWith 8 _d(seeing sequential chart 3), these pulses corresponding respectively seized side valve group 3, voltage oscillation loop 6, rectification link 7 is carried out work with current return 8 and through them to experiment table under different condition.These different state are given through program.In addition, the input end in control system has the guard signal FAULT from current return 8, the state ON/OFF signal of switch 41 in the READY signal of thyristor valve group drive plate to be detected and the current return 8., experiment table must consider following condition when carrying out work: first unit 22 in first group capacitor 5 and the capacitance C of second unit 23 ₂₂And C ₂₃Be far longer than the capacitance C on second group capacitor 4 ₂₄That is C, ₂₂=C ₂₃=C _S＞＞C ₂₄Protection reactor 11 and 12 is used to protect the story electric current that occurs on the restriction rectification link 7, and the inductance value is respectively L ₁₁And L ₁₂, these two values will be far smaller than the L of reactor 25 ₂₅Inductance value: i.e. L ₁₁=L ₁₂＜＜L ₂₅ First unit 22 on first group capacitor 5 and the charging of second unit 23 are accomplished by direct voltage source 4 twocoueses, and voltage equals zero, and voltage is+V _SWith-V _S, the rectification of thyristor valve group will be accomplished before the time interval.

If thyristor valve group to be detected has drive plate, power supply is to be connected with the equipotential bus through special loop, except experiment table control system accident condition out of control, experiment table begin and work on and following describe consistent.Controllable silicon on the thyristor valve group 3 to be detected is driven by drive plate, and voltage is obtained by controllable silicon.Experiment table does not have power supply during beginning, and control system 13 provides signal OFF (relay contact) to switch 41, that is, switch 41 is off states.Because it is uncontrollable owing to do not have alternating voltage on the thyristor valve group 3 to be detected with the REDAY signal of drive plate afterwards before experiment table is given power supply at the input end of control system 13.So begin most to cut off transformer 33 and pass through the main thyristor valve group 35 and auxiliary thyristor valve group 38 trigger voltage oscillation circuits 6 in the current return 8 with switch 41.Sequential chart 3 is seen in voltage oscillation loop 6 when steady state (SS).First thyristor valve group 26 is through pulse signal 6 _-Opening in the other direction, the time point in loop 28 is t _0-(t here _0-→ t ₀And t _0-＜t ₀, the expressed meaning is identical in following article).This moment, the voltage on second group capacitor 24 was v ₂₄(t _0-The V of)=- ₀Main thyristor valve group 35 on the current return 8 and auxiliary thyristor valve group 38 are through the superposeed voltage-V of second group capacitor 24 of the diode circuit 32 on the opposite direction loop 28 on first thyristor valve group 26 and second the thyristor valve group 29 ₀With the 22 cell voltage+V on first group capacitor 5 _S, that is: v _C(t _0-)=v _T(t _0-)=e (t _0-)=V _S-V ₀＜0.At time point t ₀Go up and give and current return 8 and rectification link 7 corresponding control waves 8 ₊, 8 _bWith 7 _- Positive dirction loop 36 and the opposite direction loop 40 of auxiliary thyristor valve group 38 on the main thyristor valve group 35 are arranged on the current return 8, and the voltage on voltage on the current return 8 and the thyristor valve group 3 to be detected is given to zero (v in the sequential chart _C(t) and v _T(t), time point t ₀).The 3rd the controllable silicon loop 31 on the thyristor valve group 30 arranged on the rectification link 7, on this valve group, turn-off second thyristor valve group 29 through diode circuit 32.Second capacitor 24 in the following order for overcharge: The third valve 30 is a thyristor SCR circuit 31 - to protect the second reactor 12 - the first group of the second capacitor 5 units 23 - The second current transformer 16 - Ground Bus 1 - the first current transformer 15 - auxiliary thyristor valve 38 in the opposite direction on the circuit (40) - the main thyristor valve 35 is Direction circuit 36 - equipotential bus 2 - first thyristor valve 26 in the opposite direction on the circuit 28 - Reactor 25 (timing diagram of current i _V (t) from t ₀ to t ₁ = t ₀ + t _V interval here L = L ₁₁ + L ₂₅ = L ₁₂ + L ₂₅ and C = C _S · C ₂₄ / (C _S + C ₂₄ )).If the voltage oscillation loop was (the concrete auspicious this paper of the opinion content of job order) with afterwards magnitude of voltage before the magnitude of voltage of the Unit 23 on first group capacitor 5 so of not having to work under the perfect condition of loss and second group capacitor 24 are overcharging:

v ₂₃(t ₀)＝-V _S， (1)

$v_{23}\left(t_1\right)=-V_S+\frac{2\&CenterDot;C_{24}}{C_S+{\mathrm{<figure-callout\; id="24"\; label="C"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">C</figure-callout>}}_{24}}\&CenterDot;(V_S+V_0)=-V_S+\mathrm{\&Delta;}{V}_S,---\left(2\right)$

v ₂₄(t ₀)＝-V ₀ (3)

$v_{24}\left(t_1\right)=v_1=v_0+2\&CenterDot;\frac{C_S\&CenterDot;V_S-{\mathrm{<figure-callout\; id="24"\; label="C"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">C</figure-callout>}}_{24}\&CenterDot;V_0}{C_S+{\mathrm{<figure-callout\; id="24"\; label="C"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">C</figure-callout>}}_{24}},---\left(4\right)$

At time point t _1-Going up through having time span is from t _1-To t ₄₊ Control wave 6 ₊ Positive dirction loop 27 controls to first thyristor valve group 26.At time point t through current return 8 ₁On allow for zero i _C(t ₁)=0 (opposite direction current i in sequential chart _C(t) and i _V(t) do not show), be V by having the amplitude superpotential afterwards _M(the v in the sequential chart _T(t)) actual electrical kinetic potential E _V=e (t ₁) carry out rectification and begin to cut off main thyristor valve group 35 positive dirctions, 36 loops and auxiliary thyristor valve group 38 opposite direction loops 40.If V ₀＜V _SC _S/ C ₂₂, second group capacitor 24 overcharges from time t so ₀To t ₁=t ₀+ t _VAnd consistent, and recharge simultaneously with formula (3) and formula (4).23 cell discharges of first group capacitor 5 and formula (1) and (2) consistent (v in the sequential chart in this time ₂₃(t).From t ₂To t ₃Time in Unit 23 charging of first group capacitor 5 provide and be charged to magnitude of voltage-V by direct voltage source 4 _SAt time point t _4-Go up first thyristor valve group 26 through pulse signal 6 ₊Open positive dirction loop 27, and open the 3rd diode circuit 32 on the thyristor valve group 30, the superposeed 23 cell voltage-V of first group capacitor 5 of main thyristor valve group on current return 8 35 and auxiliary thyristor valve 38 through it _SVoltage V4=v with second group capacitor 24 ₂₄(t _4-)＞0, that is: v _C(t _4-)=v _T(t _4-)=e (t _4-The V of)=- _S+ V ₄＞0.At time point t ₄Go up to pulse signal 8 _-, 8 _dWith 7 ₊To current return 8 and rectification link 7.In current return 8, comprise on the main thyristor valve group 35 the positive dirction loop 39 in loop 37 and auxiliary thyristor valve 38 in the other direction, the voltage of voltage on the current return 8 and seized side valve group 3 is given to zero (v in the sequential chart _C(t) and v _T(t), time t ₄).Rectification link 7 comprises the controllable silicon loop 31 of second thyristor valve group 29, and it is used for cutting off simultaneously diode circuit 32 on the 3rd the thyristor valve group 30.S Two groups overcharging of the capacitor 24 in the following order: reactor 25 - the first valve 26 in the positive direction SCR circuits 27 - equipotential bus 2 - main thyristor valve circuit 35 in the opposite direction 37 - auxiliary thyristor valve 38 in the positive direction loop 39 - the first current transformer 15 - ground Bus 1 - second current transformer 16 - the first group on the first capacitor 5 unit 22 - protection of first reactor 11 - the second valve 29 of the triac thyristor circuit 31.If above-mentioned work is under the lossless state of ideal, so the time interval from t ₄To t ₅=t ₄+ t _V First unit 22 of last first group capacitor 5 and second group capacitor 24 are at beginning t ₄To finishing t ₅=t ₄+ t _VOvercharge and be following formula:

v ₂₂(t ₄)＝V _S (5)

$v_{22}\left(t_5\right)=V_S-\frac{2\&CenterDot;C_{24}}{C_S+{\mathrm{<figure-callout\; id="24"\; label="C"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">C</figure-callout>}}_{24}}\&CenterDot;(V_S+V_4)=V_S-\mathrm{\&Delta;}{V}_S---\left(6\right)$

v ₂₄(t ₄)＝V ₄ (7)

$v_{24}\left(t_5\right)=-{\mathrm{<figure-callout\; id="5"\; label="V"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">V</figure-callout>}}_5={-V}_4-2\&CenterDot;\frac{C_S\&CenterDot;V_S-{\mathrm{<figure-callout\; id="24"\; label="C"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">C</figure-callout>}}_{24}\&CenterDot;V_4}{C_S+C_{24}}---\left(8\right)$

At time point t _5-Going up through having time span is from t _5-To t ₉₊ Gating pulse 6 _-The opposite direction loop 28 of first thyristor valve group 26 of conducting.At time point t through current return 8 ₅On allow for zero (i _C(t ₅)=0), be V by having the amplitude superpotential afterwards _M(the v in the sequential chart _C(t)) actual electrical kinetic potential E _V=e (t ₅) carry out rectification and begin to cut off main thyristor valve group 35 37 loops and auxiliary thyristor valve group 38 positive dirction loops 39 in the other direction.If V ₄＜V _SC _S/ C ₂₂, second group capacitor 24 overcharges from time t so ₄To t ₅=t ₄+ t _VConsistent with formula (7) and formula (8), and recharge simultaneously.First unit 22 discharges of first group capacitor 5 and formula (5) and (6) consistent (v in the sequential chart in this time ₂₂(t).In the time interval is t ₇÷ t ₈In first unit 22 chargings of first group capacitor 5 by direct voltage source 4 from magnitude of voltage V _SBe charged to infinity.When rechargeable energy once more equals at time interval t ₀÷ t ₁And t ₄÷ t ₅In active loss the time, voltage is balance in the steady-working state in voltage oscillation loop 6: V ₀=V ₄And V ₁=V ₅, second group capacitor 24 recharge for:

$\mathrm{\&Delta;V}=V_1-V_0=V_5-{\mathrm{<figure-callout\; id="4"\; label="V"\; filenames="HDA0000132812420000031.png"\; state="\{\{state\}\}">V</figure-callout>}}_4=2\&CenterDot;\frac{C_S\&CenterDot;V_S-{\mathrm{<figure-callout\; id="24"\; label="C"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">C</figure-callout>}}_{24}\&CenterDot;V}{C_S+{\mathrm{<figure-callout\; id="24"\; label="C"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">C</figure-callout>}}_{24}}=\mathrm{const}---\left(9\right)$

Here V=V ₀=V ₄. obtain from formula (9)

$V=\frac{{\mathrm{<figure-callout\; id="24"\; label="C\; S\; C"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">C</figure-callout>}}_S}{C_{}}\&CenterDot;V_S-\frac{C_S+{\mathrm{<figure-callout\; id="24"\; label="C"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">C</figure-callout>}}_{24}}{2\&CenterDot;{\mathrm{<figure-callout\; id="24"\; label="C"\; filenames="HDA0000132812420000011.png"\; state="\{\{state\}\}">C</figure-callout>}}_{24}}\&CenterDot;\mathrm{\&Delta;V}---\left(10\right)$

Regulation voltage ± V at the output terminal of direct voltage source 4 _S(V _S＞Δ V) can change the amplitude voltage V of second group capacitor 5 into, so alternating voltage v _T(t) on seized side valve group 3, wideer scope is arranged.Drive plate energy on thyristor valve group 3 to be detected reaches and allows magnitude of voltage v _T(t) time, signal READY metering-in control system 13 is provided by drive plate.This time is time point t ₆At time point t ₉Last with gating pulse 7 _-Be given on the controllable silicon loop 31 of the 3rd thyristor valve group 30, with gating pulse 3 _-Be given on the opposite direction loop 18 of seized side valve group 3 through the seized side valve group 3 (i in the sequential chart of current lead-through _T(t), time interval t ₉÷ t ₁₀).The switching process of thyristor valve group 3 to be detected is at time t ₁₁÷ t ₁₂Among accomplish.Any working condition in voltage oscillation loop thyristor valve group 3 to be detected of all flowing through is as described.Had on the thyristor valve group 3 to be detected to allow actual specified ac voltage and drop into transformer 33 through the switch in the current return 8 41, and by control system 13 starting current loops 8 and voltage oscillation loop 6.Must it is to be noted time interval t in sequential chart 3 ₄÷ t ₁₀The folk prescription in opposite direction loop 18 that is thyristor valve group 3 to be detected supposes that to admittance value seized side valve group is that asymmetric controllable silicon form constitutes, and does not promptly have positive dirction loop 17.Opposite direction loop 37 in the current return 8 on the main thyristor valve group 35 and the positive dirction loop 39 on the auxiliary thyristor valve group 38 have constituted the forward conduction function in voltage oscillation loop.Same completion folk prescription also is like this on commutating voltage to the experiment of thyristor valve group.Because the controllable silicon on main thyristor valve group 35 all is to have selected the consistent former device of on state characteristic,, be merely all pressure values of serial connection controllable silicon so the capacity on the RC loop is not very big.RC loop on the thyristor valve group to be detected is that protection is because the overload that switching process produced.So current return 8 wants minimum to the influence of seized side valve group in switching process.In addition, in the state of accident, the controllable silicon on the main thyristor valve group 35 in the current return 8 is parallel with voltage dependent resistor (VDR) (RC loop and voltage dependent resistor (VDR) do not show) on first electrical schematic diagram.

Here must be noted that has transformer 33 in current return 8, its secondary side winding be big electric current (～5kA), same current limiting reactor 34 also is so, but voltage be low pressure (～220V).RC protection loop 42 (see figure 2)s on the auxiliary thyristor valve group 38 have been shunted the rectification superpotential, and the rectification superpotential flows through current limiting reactor 34 (in Fig. 1, not showing) through the former device of protection on the main thyristor valve group 35.When high-power superpotential occurring, such as, control disappearance on the control thyristor valve group 38 out of control or auxiliary of main thyristor valve group 35 in initial state, auxiliary thyristor valve group 38 is by threshold circuit 43 conductings of oneself, and the conducting amplitude is (600 ÷ 700) V; This moment, threshold circuit 43 conducting sensors 49 were also through the input end of optical signal transmission FAULT to control system 13.Control system 13 is noted this signal, cancels the gating pulse of all thyristor valve groups of experiment table simultaneously and cuts off the switch 41 in the current return 8.

Drive plate 44 and 45 on auxiliary thyristor valve group 38 is used to control the controllable silicon of positive dirction 39 and opposite direction 40. Diode 50 and 51 has been shunted silicon controlled control p-n conversion on opposite direction.Protection loop 46 and 47 is to be used to eliminate the former device that IXYS company is used in the malfunction suggestion of controllable silicon under noisy condition.When on auxiliary thyristor valve group 38, superpotential occurring; Such as; When BOD---diode 52 arrives the threshold circuit working value in unidirectional positive dirction, by following sequential turn-on loop:---------------first resistance 53---is connected in parallel on first and protects electric capacity 54 and second resistance 57 on loop 46---first input end C1 on the threshold circuit 43 to the 3rd resistance 58 in the sensor 49 to second diode 51 to second input end C2 on the threshold circuit 43 for negative direction (-) output terminal of diode rectification 48 and second ac output end (～) for second ac output end (～) of diode rectification 48 and positive dirction (+) output terminal.At BOD---electric current is through first current-limiting resistance 53 during diode 52 actions.Formed pressure drop on the 3rd resistance 58 (current sensor) of electric current in sensor 49; This electric current on second stabilivolt 61, has formed the stable amplitude voltage of the 5th resistance 60 of giving series connection and optical sensor 62 through the 4th resistance 59 on stabilivolt 61.Above-mentioned electric current second resistance 57 on shunt capacitance 54 and first protection loop 46 of also having flowed through has formed return voltage, and has amplified the Control current of p-n conversion on first stabilivolt 56, the three diodes 55 and the positive dirction controllable silicon 39.39 conductings of positive dirction controllable silicon have also been shunted superpotential safely.

Claims (3)

1. be used for the experiment centre that the thyristor valve group detects, experiment centre includes ground strap and the equipotential bus that is used to connect tested thyristor valve group; Direct voltage source; Be connected the capacitor of DC voltage source output terminal; Be connected the voltage oscillation loop of equipotential bus; Be connected the current return on ground strap and the equipotential bus; The invention is characterized in; On current return, be in series with alternating-current voltage source, current limiting reactor and main thyristor valve group, when thyristor valve group to be detected is experimentized, be parallel with the loop that is in series by alternating-current voltage source and current limiting reactor on the current return.

2. the experiment centre that is used for the detection of thyristor valve group according to claim 1; It is characterized in that; In current return, also comprise an auxiliary thyristor valve group, the controllable silicon of this auxiliary thyristor valve group occurs with positive and negative parallel form, has threshold circuit; The input end of threshold circuit is connected with the controllable silicon power utmost point, and output terminal is connected with the silicon controlled control utmost point.

3. the experiment centre that is used for the detection of thyristor valve group according to claim 2 is characterized in that said threshold circuit provides energy by sensor.

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