JPS59226688A - Energizing device of linear motor - Google Patents

Abstract

PURPOSE:To suppress the variation in the reactive power produced due to the breakage of a gate by gradually falling or rising the output current and a circulating current when switching a cycloconverter from energized state to a gate interrupting state, from gate interrupting state to energized state. CONSTITUTION:When a train VH enters a section SECn, a signal G1 becomes 0 by a section switching controller SC, and the output signal F11 of the primary delay circuit H1 (S) gradually decreass. Thus, a load current command value LLA* of a cycloconverter CC-A and a circulating current command value IOA* are attenuated. Therefore, the entire reactive power QT advances, and the circulating current command IOB* of the cycloconverter CC-B increases. When the 3-phase load current ILA of the cycloconverter CC-A and the current IOA become sufficiently small, the output signal G12 of a Schmitt circuit SH1 becomes 0, and the gate of the cycloconverter CC-A is not interrupted at the gate.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention constantly controls the fundamental wave power factor at the power receiving end to 1, and supplies power to each ground-side armature coil or near motor power supply according to the position of the traveling body. Regarding equipment.

Technical Background of the Invention In recent years, linear motor propulsion has attracted attention as one of the propulsion methods for ultra-high-speed railways. This linear motor is a general rotary electric motor developed in a straight line, with armature coils arranged on the ground side, and provides linear driving force to a running body corresponding to a rotor.

Conventionally, a non-circulating cycloconverter has been used as a device for supplying variable frequency multiphase alternating current to the armature coil of this linear motor, but it takes a lot of reactive power from the power supply side, and the frequency of the load side is low. The disadvantage was that the value fluctuated greatly in synchronization with the This not only increases the number of facilities on the power supply side, but also has various negative effects on other electrical devices connected to the same system.

As a method for compensating for the reactive power of this cycloconverter and always maintaining the fundamental wave power factor at the receiving end at 1, there is a method shown in FIG. 1, for example.

In FIG. 1, VH is a running body having field poles -8EC,1,SgCn, 8ECn+1. , , are three armature coil units (hereinafter referred to as sections) installed on the ground side, swo, , swn, swn+0. ,, is 3
The phase switches CC-A and CC-B are circulating current type cycloconverters that output variable frequency three-phase electric sinusoidal current.
C is a phase advance capacitor, BUS is a 3-phase AC power supply line,
SC is section switching, first control circuit, C0NT-A
, C0NT-B are the control circuits of CC-A and CC-B, respectively, QC is the reactive power control circuit, ps is the field pole position detector of the traveling body VH, PTG is the three-phase electric wave pattern generation gain, F-
V is a frequency-voltage converter, spc is a speed control circuit, MA
, MB are multipliers. Further, Smue8B is a gate breaker for cycloconverters CC-A and CC-B.

When the traveling body VH is in the section 8ECn,-1 position, the switch 8Wn- is output from the cycloconverter CC-A.
1 to the armature coil of section 8FfCn-1 (
: Three-phase electric sinusoidal current is supplied. ps detects the position of the field pole of the traveling body, and generates a rectangular wave signal whose phase is shifted by 1200. 3-phase electric sinusoidal pattern generator PTG
generates a three-phase electric sinusoidal wave of unit voltage synchronized with the rectangular wave signal of Pa, and provides the signal to the input of the multiplier MA sMB. Also, the digital signal from P8 is converted into an analog value (2) by the F-V converter and inputted to the speed control circuit spc. spc generates a signal Im proportional to the speed deviation and inputs it to the multipliers MA and M!I. . From the multiplier M□, the following 3
Generates a phase electric sinusoidal current command IL.

I LA-U = lm5inωt I LA-v = jHI Sin (ωt-2π/
3) I LA-W = ImSin (ωt+2π/3)
The same holds true for the output signal (2) of the multiplier M.

I*L! l −t+ = lm5inωt”Ltv =
lm8in (ωt-2π/3)I Ll-W ==
lm5in (act + 2jr/ 3) above 3
According to the phase load current command I-me, the cycloconverter (
5) - A person supplies a three-phase electric sinusoidal current to the armature coil to provide a linear driving force to the traveling body vH.

Similarly, the cycloconverter CC-B receives the above command I"bm.
l:.

Therefore controlled.

Since it is wasteful to supply armature current to a section where there is no running body, the cycloconverters CC-A and CC-B are operated alternately, and the three-phase switches 5wn-, .
FMn, . . . are sequentially switched to supply power.

FIG. 2 is a time chart showing the operating mode of the device of FIG. 1. G1 and G are each cycloconverter C
The section in which the traveling object (vehicle) is located is detected by the signal controlling the gate breaker 8A of CA and the gate breaker island of CC-H, and the control is performed in the illustrated mode. If the length of the section is '1% and the length of the traveling body VH is /, then G is ON only during the period /, + /.

/1- It is turned off only during the period of /. G, operates with a section length l, shifted from G1, and has a wrap period T/, between it and G. Section 5BCn-1 has 3
Power is supplied from CC-A via phase switch SWn.

Switch 8Wn-violet is turned on or opened when G is OFF', that is, when cycloconverter CC-A is not operating. That is, it is turned on a time t0 earlier than the ON signal of Gl, and released a time t0 later than the OFF signal of G1. In this way, switch 5Wn-1
This prevents arcing caused by opening and closing.

Turn on switch SWn, and switch from CC-A to section 8.
When a three-phase electric sinusoidal current is supplied to ECn-, a driving force is obtained to the traveling body and it accelerates.The tip of the traveling body is applied to section 5ECn, and the cycloconverter CC-
Power is supplied from 8 to section sgcn via switch SWn. SWn is turned on at t from the ON signal of G.

As mentioned earlier, the speed is increased by

When the traveling body VH is located between sections 5ECn-1 and 5Ecn, the cycloconverters CC-A and CC-B
are operated at the same time to provide driving force to traveling body 1. Running body VH
When the rear end passes section sgcn, gate signal G1 turns OFF, and cycloconverter CC-A
stop the operation.

Thereafter, similarly, the cycloconverters CC-A and CC-B operate alternately while supplying lap power according to the position of the traveling body vH, and the switches swn, swn+1, 8Wn+2, . ,,
Through section SgCn, agcn+, , 5
ECn+2. , , to supply power.

Cycloconverters CC-A and CC-B are circulating current type three-phase output cycloconverters, and the delayed reactive power on the power supply side is determined by the absolute value of the load current, the magnitude of the circulating current, and the sine value of the converter's firing control angle. related to.

For example, the delayed reactive current component IRIm0-A on the power supply side of the cycloconverter CC-A can be expressed as follows.

However, “U +IV I■W is the three-phase load current, ■O
L++ ”OV+ IOW is circulating current, αυ, αV, α
Let W be the arc control angle and kl be the conversion constant.

■RmAo 〒-4=＋((lIul+2 ・Ioo
)・S! n αo+(lIvl+2 ・Iov)'s
inαv + (1'wl+2・Iow)・sinα,)
Delayed reactive current component IRI of cycloconverter CC-H
On the other hand, since the leading reactive current r cap flows through the phase advancing capacitor C, the reactive current IQ at the receiving end is given as follows.

IQ = I am much + IRIAO?
-B -Icap QC in Figure 1 detects the reactive power Q (which can be considered as reactive current Iq) at the power receiving end, and controls the cycloconverters CC-A and C so that the value becomes zero.
Controls the circulating current of C-8. IOA is the command value of the above-mentioned circulating current IOU + work 0 map IOW. IQ proverbs have similar command values.

I-A==I- mainly changes depending on the speed of the traveling body and section switching. The latter has a particularly large impact.

FIG. 3 is a time chart showing the operating mode of the device shown in FIG. 1 and the magnitude of each line current.

Prisoner and G! As described above, the ON and OFF operations are repeated as shown in the figure depending on the position of the traveling body VH. Along with this, the load currents IL and ILB of the cycloconverter are repeatedly supplied and stopped. At this time, the circulating currents ioa and I
oB varies depending on the following modes.

(1) G, :ON, G, :ON (wrap period) This is a period in which both CC-A and CC-8 are operating and supplying three-phase current to the armature coil of the near motor.

Due to the flow of IL and ILII, a delayed reactive current is drawn on the power supply side, so the command value of the circulating current is
A small value of ``I-'''' IOI is sufficient.Therefore, the actual circulating current is controlled to IOA=IO!1'' IOI.

(2) In the case of G, : ON, G, : OFF, cycloconverter CC-B stops operating and ILI
I=O+Ioa=O. Therefore, with only cycloconverter CC-A, Iv + 5hol-m = 'Icap
The circulating current IOA must be caused to flow so that: [t, n = O]
OA increases. That is, I”OA=I”OI”−
However, the actual circulating current is IOA "' IO
I + Ion ”” O.

+31 G, : OFF, G, : ON, cycloconverter CC-A stops operating and ILMU=0,
Engineering. □=0. Therefore, the circulating current IoB of CCC-8
The value is indicated by IOI in FIG.

Ioomu and Hi Ioo11 high cycloconverter CC-A
and indicates the magnitude of the current flowing through CC-a, 10
0A=I, Mujuku0mu+”(1611:ILII+
O becomes l0II [Problem of Background Art] As described above, in the conventional linear motor power supply device, the gates of the two cycloconverters are alternately cut off, and the sections are switched between them. As the gate of the cycloconverter is cut off, not only the load current but also the circulating current is suddenly brought to zero, and as a result, the reactive power at the power receiving end rapidly advances by 1:.

In order to counteract this, the circulating current of the cycloconverter during power supply increases, but since there is a certain delay time in the control system, the lagging reactive power necessary to compensate for the rapidly increasing leading reactive power is quickly reduced. cannot be obtained.

Therefore, every time the gate is cut off, transient reactive power remains,
The intended purpose of always making the power factor at the receiving end 1 is not achieved. A similar thing occurs when gate cutoff is released, and appears as reactive power fluctuations at the power receiving end.

Furthermore, in the conventional device, commands for the circulating current and load current are given in a stepwise manner (1 = 1) when the gate is released.
There are problems such as current overshoot occurs and load current distortion increases.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and eliminates the reactive power fluctuation at the receiving end due to gate cutoff of the cycloconverter, always maintains the input fundamental wave power factor at 1, and
It is an object of the present invention to provide a linear motor power supply device that can supply a sinusoidal current with little distortion to a linear motor.

[Summary of the invention]

The present invention includes a plurality of cycloconverters each having a circulating current control circuit that supplies power via a changeover switch to each armature coil that is divided into a large number of units arranged along a track, and a plurality of cycloconverters that are connected to the receiving end of the cycloconverters and that generate reactive power. a reactive power control circuit that controls the circulating current of the cycloconverter so that the phase advancing capacitor generated and the delayed reactive power generated by the operation of the cycloconverter cancel out the advanced reactive power and become a predetermined reactive power; a section switching control circuit that switches the changeover switch according to the position of the traveling body running on the track; and a switch that outputs from the section switching control circuit when the armature coil unit that is being powered is disconnected by opening the changeover switch. When switching the cycloconverter from a power supply state to a gate cutoff state or from a gate cutoff state to a power supply state in a power supply device for a near motor, which is equipped with a gate cutoff circuit that cuts off the gate signal of the cycloconverter in response to a timing signal. A buffer control circuit is installed to control the output current and circulating current of the cycloconverter to gradually fall or rise according to a timing signal, and to cut off the gate when the output current reaches a predetermined attenuation rate. This is a near motor power supply device that suppresses fluctuations in the motor.

[Embodiments of the invention]

FIG. 4 is a configuration diagram showing an embodiment of the linear motor power supply device of the present invention. In the figure, C8, C! , Cs is a comparator, Hzes), Hm(S) y Hl1(S) is a control compensation circuit for reactive power control at the receiving end, Ht(s), H
t(s) is a first-order lag circuit (buffer circuit), 8H,, SH
, is Schmitt circuit (level detection circuit), MM*
＋MM! is mono, multi-circuit, ML□.

ML, , ML, , ML are multipliers. Other symbols follow the symbols shown in FIG.

FIG. 5 is a time chart diagram for explaining the operation mode of FIG. 4. Signal Gl t G! is an output signal of the section switching control circuit SC, which is output according to the position of the vehicle VH. The signal G1. G, are input to the first-order delay circuits Hr (s) and Ht (s), respectively, to obtain the signals G, , G□ shown in FIG. By using the rise and fall characteristics of Hl(8) and Ht(s), which take a shorter time than the first-order lag time constant, the slope = dV/dt can be made almost constant (=. Note that % Ht( Even if an integrating circuit and a limiter circuit are used for Ht(s) and Ht(s), similar signals 01m and G□
is obtained.

The Schmitt circuits 8H, , 8H are connected to the above-mentioned signal G3. and G
It detects that □ has become a sufficiently small value δ or less and outputs signals Glt and Ggg. When Gt+<δ, G□=0, which gates off the cycloconverter CC-A and also outputs the signals Glt and Ggg. □When δ, C9,=0,
Gate off CC-B.

The output signal GIt of Schmitt circuit SH, and the output signal G□ of SH, are monomulticircuits MM1 and MM, l, respectively.
Two people are powered and get signals G13 and G11. Signal G1m
is triggered by the falling edge of the signal G, and remains at the level @1'' during time T. Also, the signal G, 3 is triggered by the falling edge of the signal G,
It is triggered at the falling edge of t and remains at the 11'' level for a time ΔT.

The next signal G14 is the OR logic of the signal Glt and 011, and when G8=O, the cycloconverter C
Section changeover switch 5Wn-1 on the output side of C-A
゜5Wn4-1. Switch...

Moreover, the signal G□ is the signal G1 and G! 8, and when G, , == Q, the section changeover switch SWn on the output side of the cycloconverter CC-B,
Switch 8Wn+2+-.

Output signal G of first-order lag circuit H1(S) and Hl(s)
11 and G2. are also input to multipliers ML and ML, respectively, and are multiplied by the load current peak value command Im, which is the output signal of the speed control circuit SPC. Multiplier M
The output signal ImA''lm-G11 of L, gives the peak value of the three-phase load current command ILA of the cycloconverter CC-A, and gradually rises and falls in proportion to the signal G2. Similarly, the output signal Im!I of the multiplier ML: Im-G□ is the output signal of the cycloconverter CC-B.
It gives the peak value of the three-phase load current command I Lm,
Said signal G! It gradually rises and falls in proportion to the violet.

Furthermore, the output signal G of Hl(8) and -(8), □
and G.

is input to another multiplier ML3 and ML, and multiplied by a circulating current command value I''OA+I''OB, which will be described later.

In Fig. 4, Qte is the reactive power detection value at the receiving end of the entire cycloconverters CC-A and CC-8 including the phase advance capacitor C, QA is the delayed reactive power detection value of the cycloconverter CC-A, and QB is the reactive power detection value of the cycloconverter CC-A. Cyclo converter CC-
This is the delayed reactive power detection value of B.

Comparator C8 calculates the overall reactive power detection value Q〒 and its command value Q? Compare 1. The deviation εI=Q? Qr as the next control compensation circuit H? Enter (S). This control compensation circuit Hi (8) is usually composed of a proportional element or an integral element, and its control constant is selected at an appropriate value in consideration of the stability and responsiveness of the control system. Here, an integral element is used to control the steady-state component of the deviation ε to zero. Hi (S) output signal QAB is output from cycloconverters CC-A and CC-B.
Give the reactive power command value.

The comparator C2 compares the delay and reactive power detection value QA of the cycloconverter CC-A with the above command value B, and calculates the deviation ε*=Q Am -QA to the next control compensation circuit HA.
Enter in (8). Similarly, the comparator C3 compares the delayed reactive power detection value Q++ of the cycloconverter CC-H with the above command value, and the deviation εs=Q”A!IQB
is input to the next control compensation circuit HB(S). The control compensation circuit HA(S).

Hi(S) is usually composed of a proportional element or an integral element, but for the sake of simplicity, both are treated as proportional elements of the amplification factor KAB here.

The output signal I"OA=KAI・ε! of HA(s) becomes the circulating current command value of the cycloconverter CC-A, and is input to the multiplier ML3, and finally I-==I"
It is given as OA@G, .

Also, the output signal of Ha(8) I-== KA, @ε3
is the circulating current command value of the cycloconverter CC-B, which is manually input by the multiplier ML, l- and finally I”o
n = I-.G, given as I.

Based on the above, train VH is section 8EC.
When passing through n+1 and reaching section 5FiCnl, gate off cycloconverter CC-A and open section changeover switch 5wn-, 8
The operation when turning on Wn+1 and setting CC-A to power supply mode again will be described.

When the train VH enters section 8ECn, its vehicle position is detected and the section switching control circuit SC generates signals G, :Q, which is the output signal Gi of the primary delay circuit H1 (8).
, gradually decreases by 1 with a slope of -. Accordingly, the peak value Im of the load current command value IL and the circulating current command value ■*2 also attenuate. Therefore, cycloconverter CC-A
The delayed reactive power QA decreases, and the overall reactive power Qte becomes advanced, 81=Q? Q〒=-Q ding (however, Qt=
o+: when set) is a positive value. As a result, the cycloconverter CC
-H reactive power command value QAB is increased, circulating water'
The current command value IoB=IoB-G□ is increased. At this time, since it is in the state of ott"t, I-:=I-. Therefore, the delayed reactive power Qe of CC-H is controlled according to its command value Bam!112, and the total reactive power Q ?teeth,
It is controlled to reach the command value Qy.

In addition, since the number of people decreased by 9 and the command value Q''All increased, the deviation ε1 = Q*AB - QA increases with a positive value, but if a limiter circuit is installed in the control compensation circuit HA (8). If it is added, the output signal I% becomes constant at the upper limit value.Therefore, as G,1 decays, the circulating current command value I*o'A=I''0A-Go, becomes the above deviation ε, It will attenuate regardless of the value of.

When the three-phase load current ILA and circulating current of the cycloconverter CC-A are sufficiently reduced by the first buffer control circuit consisting of ML and MA and the second buffer control circuit consisting of ML, the Schmitt circuit SR1 The output signal Gtt becomes @0'', and the cycloconverter CC-
Gate off A. Therefore, the delayed reactive power Q of CC-A
The gate will be cut off after the amount of energy becomes sufficiently small, and the reactive power Q at the receiving end will be reduced. The variation in is very small.

After the time period of gate breaker ΔT of CC-A has passed, section changeover switch 8Wn-m is opened. The time ΔT is set by the mono multi-circuit MM1, and CC
-A is set in anticipation of the time when the output current of 14 becomes completely zero.

When the train VH advances to an appropriate position in section 5ECn, the next section switch -+1 is turned on to release the gate cut-off of CC-A. Note that the section switch 8Wn+i may be turned on at the same time as the previous section switch 8Wn- is opened. Also, as a matter of course, the CC-A gate must be released after the section switch 8Wn+1 is turned on.

When the gate cutoff of σ-A is released, the peak value of the three-phase load current command I''LA, mA, and the circulating current command value I*o'A
is the signal G1. The slope gradually rises and increases in proportion to the value of . As a result, the circulating current Inn of the cycloconverter CC-H gradually decreases and returns to its original value. As a result, Qmu = QII = QAB, and the reactive power at the receiving end Q? is still controlled to be equal to QTE. This operation moves train VH from section 8gCn to section 5E.
Complete before entering Cn+t.

As train VH progresses, cycloconverter C (,
A and CC-8 are alternately cut off, but as the same operation as above is repeated, the reactive power Q? at the receiving end is reduced. is always its command value Q? controlled to match.

[Other embodiments of the invention]

A case where three cycloconverters are prepared and these are operated in sequence to supply power to each armature coil unit (section) of a linear motor can be implemented in the same manner as described above. In short, 2
The present invention can be applied to any system in which power is supplied alternately using more than one cycloconverter, and similar effects can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, there is no reactive power fluctuation at the power receiving end due to gate cutoff of the cycloconverter for section switching, and the input fundamental wave power factor can always be kept at 1. Therefore, the capacity of the power supply system equipment is reduced, and various adverse effects on other electrical equipment due to voltage fluctuations are eliminated.

Further, since the circulating current command and the load current command are gradually raised or lowered, the actual current can sufficiently follow them, and an output current without distortion can be obtained in accordance with the command value.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a conventional linear motor power supply device, Fig. 2 is a time chart showing the operating mode of the device in Fig. 1,
3 is a time chart showing the operating mode of the device shown in FIG. 1 and the magnitude of current at each part. FIG. FIG. 3 is a time chart diagram showing the operation mode of the device shown in the figure. ■・・・・・・Running body 8E (41-1, 8BCn, 8ECn+t, 5BC
1+2, - Armature coil unit (section) SWn-1, Swn, SWn+1, 8W, +2. ,,,
3-phase switches CC-A, CC-B...3-phase output circulating current type cycloconverter c'...phase advance capacitor Sa...section switching control circuit Smus8B...gate breaker C0NT-A, C0NT-8...Load current and circulating current control circuit P8. ...Field pole position detector PTG...Three-phase electric sinusoidal pattern generator F-V...Frequency-voltage converter 8PC...Pa speed control circuit MA, M! l, ML, , ML, , MLll,
ML4, - Multiplier C,,C,,C3...Comparator 11te(S), Hmu(8), Hl(S)...Control compensation circuit H+(s+, Ht(s)... 1st order delay circuit 8H1
,8H,... Schmitt circuit

Claims (2)

[Claims] (1) A plurality of cycloconverters each having a circulating current control circuit that supplies power via a changeover switch to each armature coil that is divided into many parts along the track, and a cycloconverter connected to the receiving end of the cycloconverter to generate progressive reactive power. a reactive power control circuit that controls the circulating current of the cycloconverter so that the phase advancing capacitor generated and the delayed reactive power generated by the operation of the cycloconverter cancel out the advanced reactive power and become a predetermined reactive power; a section switching control circuit that switches the changeover switch according to the position of the traveling body running on the track; and a switch that outputs from the section switching control circuit when the armature coil unit that is being powered is disconnected by opening the changeover switch. When switching the cycloconverter from a power supply state to a gate cutoff state or from a gate cutoff state to a power supply state in a power supply device for a near motor, which is equipped with a gate cutoff circuit that cuts off the gate signal of the cycloconverter in response to a timing signal. A linear motor characterized by being provided with a buffer control circuit that controls the output current and circulating current of the cycloconverter to gradually fall or rise according to a timing signal, and to cut off the gate when the output current reaches a predetermined attenuation rate. power supply device. (2) A buffer circuit that obtains an attenuation rate signal that gradually lowers or raises the buffer control circuit according to a switching timing signal from the section switching control circuit; first and second buffer control circuits that gradually lower or raise the current reference signal and the circulating current reference signal according to the attenuation rate signal; a second buffer control circuit;
2. A power supply device for a linear motor according to claim 1, comprising a level detection circuit that detects that the attenuation rate signal is below a predetermined value and outputs a gate cutoff signal.