JPH09201097A - Starting apparatus for synchronous machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a starting apparatus by which the heat generating amount of every thyristor starting device is reduced by a method wherein output currents of two or more thyristor starting devices used to start an identical synchronous machine are balanced. SOLUTION: A starting apparatus is provided with two thyristor starting devices 1a, 1b in such a way that DC outputs of rectifiers 4a, 4b which convert an alternating current into a direct current are converted into variable-frequency AC power by inverters 6a, 6b so as to be supplied to a synchronous machine 2, that current reference signals Ira's of the rectifiers 4a, 4b are adjusted by speed regulators 11a, 11b so as to make the rotational-speed set value Nra of the synchronous machine 2 agree with a rotational speed N and that current regulators 14a, 14b by which ignition pulses to the rectifiers 4a, 4b are adjusted so as to make the current reference signals Ira's agree with converter currents Ida's of the rectifiers 4a, 4b are provided. Then, an unbalanced-current compensator 20a corrects the rotational-speed set value Nra in such a way that the current reference signal Ira of the own thyristor starting device 1a and the current reference signal Irb of another thyristor starting device 1b are balanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous machine starting device for starting a synchronous machine using a plurality of thyristor starting devices.

[0002]

2. Description of the Related Art In a combined cycle power plant, a gas turbine and a steam turbine are connected to drive a gas turbine generator, and one gas turbine, one steam turbine, and one gas turbine generator are provided respectively. The one directly connected is called one axis. Generally, a combined cycle power plant has a multi-axis configuration having four or more gas turbine generators.

These gas turbine generators are synchronous machines, and a thyristor starter is installed on each shaft as a starting apparatus for the gas turbine generator which is the synchronous machine. In this case, in order to reduce the number and capacity of thyristor starters, the following configuration is considered.

That is, two thyristor starters each having a capacity half that required to start up one gas turbine generator with only the thyristor starter are installed, and each thyristor starter has a function of which gas turbine generator. To be able to supply output to. With such a configuration, when starting the plant, the two thyristor starters are used to start the gas turbine generator for the first axis, and the second and subsequent axes are supplied from one thyristor starter and the axis in operation. The auxiliary steam is used to start up sequentially. In a combined cycle power plant, it is rare to stop all the axes, so after starting the first axis, it is possible to start each two axes using two thyristor starters and auxiliary steam from the operating axis. Become.

FIG. 11 shows two thyristor starters 1.
The conventional example of the synchronous machine starter which starts one synchronous machine (gas turbine generator) 2 with a and 1b is shown. Since the thyristor starting device 1a and the thyristor starting device 1b have the same configuration, the thyristor starting device 1a will be described below. The same components of the thyristor starting device 1a and the thyristor starting device 1b are the suffixes a and b.
Are shown separately.

In FIG. 11, the power supply for starting the synchronous machine 2 is input as an AC power supply via the input transformer 3a, and is once converted to DC by the forward converter 4a. Forward converter 4
The DC converted by a is smoothed by the DC reactor 5a,
The inverse converter 6a inversely converts the AC into a predetermined frequency necessary to start the synchronous machine. The inversely converted AC is supplied to the synchronous machine 2 via the AC reactor 7a and the breaker 8a connecting the thyristor starter 1a and the synchronous machine 2.

The forward converter 4a and the inverse converter 6a are three-phase rectifiers each composed of a thyristor element. The speed pulse generator 9a outputs a pulse signal PNa having a frequency proportional to the rotation speed N of the synchronous machine 2. The speed detector 10a receives the pulse signal PNa and outputs the rotation speed signal Psa. The speed adjuster 11a receives the rotation speed set value Nra and the rotation speed signal Nsa, amplifies the deviation signal, and outputs the current reference signal Ira.

On the other hand, the current detector 12a is a current transformer 13a.
The current output proportional to the alternating current of the forward converter 4a, which is converted and output by the above, is rectified, and the converter current signal Isa proportional to the converter direct current Ida is output. Current regulator 14a
Inputs the current reference signal Ira obtained in the speed adjustment period 11a and the converter current signal Isa detected by the current detector 12a, amplifies the deviation signal thereof, and outputs the forward converter phase control signal θr1a.

The forward converter pulse generator 15a is a forward converter synchronous power transformer 16a installed on the primary side of the input transformer 3a.
AC power is input to detect the synchronous power supply phase θ1a, the forward converter phase control signal θr1a is input, and the firing pulse is sequentially applied to each thyristor element of the forward converter 4a at a timing corresponding to the forward converter phase control signal θr1a. The signal P1a is output.

The inverse converter pulse generator 17a is an inverse converter synchronous power transformer 1 installed on the output side of the AC reactor 7a.
8a is input to detect the synchronous power supply phase θ2a, and the inverse converter phase control signal θr2a is input to input θr.
The firing pulse signal P2a is sequentially output to each thyristor element of the inverse converter 6a at a timing corresponding to 2a.

The operation of the thyristor starting device 1a when accelerating the synchronous machine 2 in the above structure will be described. In addition, since the output voltage Vg of the synchronous machine 2 does not reach a sufficiently large value while the synchronous machine 2 is accelerated from the stopped state or the low rotational speed state at the time of turning to a predetermined rotational speed, the inverse converter pulse generator. 17a is the synchronous power supply phase θ
2a cannot be detected. Therefore, while the synchronous machine 2 is being accelerated from the stopped state or the turning state to the predetermined rotation speed, the reverse conversion 6a is performed based on the rotor position signal output from the separately provided rotor position detector of the synchronous machine 2. Firing pulse signal P2a is generated. Since the operation during this period is not directly related to the present invention, its explanation is omitted.

The operation of the thyristor starting device 1a after the synchronous machine 2 is accelerated to a predetermined rotation speed will be described below. When a predetermined field current is applied to the field winding of the synchronous machine 2, an output voltage Vg proportional to the rotation speed N is induced. The reverse converter 6a performs reverse conversion operation using this voltage Vg as an AC power source and sends electric power to the synchronous machine 2.

On the DC side of the inverse converter 6a, an inverse converter DC voltage VDC2a corresponding to the output voltage Vg of the synchronous machine 2 and the inverse converter phase control signal θr2a appears, but with respect to this inverse converter DC voltage VDC2a. The current regulator 14a adjusts the forward converter phase control signal θr1a so that the converter current signal Isa matches the current reference signal Ira, and controls the forward converter DC voltage VDC1a. The speed adjuster 11a increases or decreases the current reference signal Ira so that the rotation speed signal Nsa matches the rotation speed set value Nra, and controls the synchronous machine 2 to a predetermined rotation speed.

Here, in FIG. 11, the input transformer 3a is provided for converting the voltage level and protecting the thyristor element of the forward converter 4a from a short-circuit current, and the DC reactor 5 is used.
a is provided for ripple control of the converter DC current Ida. In addition, the AC reactor 7a is an inverse converter 6a.
It is provided to protect the thyristor element of (1) from short circuit current.

[0015]

However, the above-mentioned conventional example has the following problems. When the thyristor starting device 1a and the thyristor starting device 1b are simultaneously operated to start one synchronous machine 2, the thyristor starting device 1
a and the thyristor starter 1b have no problem while accelerating the synchronous machine 2 at the maximum output, the thyristor starter 1a
And the thyristor starter 1b respectively set the rotational speed N of the synchronous machine 2 to the rotational speed set value Nra and the rotational speed set value Nrb.
Problems arise when adjusting according to.

That is, the current reference signal Ira, which is the output of the speed adjuster 11a, and the speed adjuster 11b are output due to variations in the rotation speed signal Nsa output by the speed detector 10a and the rotation speed signal Nsb output by the speed detector 10b. The current reference signal Irb, which is the output of, does not match. As a result, the converter DC current Ida and the converter DC current Idb vary.

Generally, the speed regulator 11a and the speed regulator 1
1b means that the steady gain is increased in order to reduce the control deviation, so that the rotation speed signal Nsa and the rotation speed signal N
Even if the variation with sb is slight, the converter DC current I
The variation between da and the converter DC current Idb becomes large. In order to allow such a variation between the converter DC current Ida of the thyristor starting device 1a and the converter DC current Idb of the thyristor starting device 1b, the heat dissipation design of the thyristor starting device 1a and the thyristor starting device 1b is changed to the converter. It is necessary to perform the maximum value of the DC current Ida and the converter DC current Idb. In such a case, the thyristor starting device 1a or the thyristor starting device is compared with the case where the speed control operation is performed by balancing the converter direct current Ida of the thyristor starting device 1a with the converter direct current Idb of the thyristor starting device 1b by some means. The heat generation amount of 1b increases, which is disadvantageous in heat dissipation design.

An object of the present invention is to start a synchronous machine capable of reducing the heat generation amount of each thyristor starter by balancing the output currents of two or more thyristor starters that start the same synchronous machine. To get the equipment.

[0019]

According to a first aspect of the present invention, there is provided a forward converter for converting an alternating current into a direct current, and a reverse converter for converting a direct current output of the forward converter into alternating current power having a variable frequency and supplying the alternating current power to a synchronous machine. Adjust the current reference signal of the forward converter so that the rotation speed setting value of the synchronous machine and the rotation speed match.Adjust the current reference signal and the converter current of the forward converter so that they match. A starting device for a synchronous machine, comprising two thyristor starting devices provided with a current regulator for adjusting the timing of an ignition pulse supplied to a converter, the current reference signal and a current reference signal for another thyristor starting device. Each thyristor starting device is provided with an unbalanced current compensator that amplifies the deviation between the above and outputs a drooping signal of the rotation speed set value.

In the first aspect of the invention, the unbalanced current compensator modifies the rotational speed setting value so that the current reference signal of its own thyristor starter and the current reference signal of another thyristor starter are balanced. .

According to a second aspect of the present invention, there is provided a forward converter for converting alternating current into direct current, an inverse converter for converting direct current output of the forward converter into alternating current power having a variable frequency and supplying the same to a synchronous machine, and a synchronous machine. Supply the speed regulator that adjusts the current reference signal of the forward converter so that the rotation speed setting value and the rotation speed match, and the forward converter so that the current reference signal and the converter current of the forward converter match. A thyristor starter having two or more thyristor starters each having a current regulator that adjusts the timing of a firing pulse, and a current reference signal of each thyristor starter is input to calculate an average value. Each thyristor includes an average value calculator that calculates and outputs the target current reference signal, and an unbalanced current compensator that amplifies the deviation between the current reference signal and the target current reference signal and outputs the droop signal of the rotation speed setting value. To prepare for the starter is there.

In the second aspect of the invention, the average value calculator inputs the current reference signal of each thyristor starter, calculates the average value and outputs the target current reference signal, and the unbalanced current compensator outputs the current reference signal. And a deviation from the target current reference signal obtained by the average value calculator are amplified and a drooping signal of the rotation speed set value is output. This balances the current reference signals of each thyristor starter.

According to a third aspect of the invention, in the second aspect of the invention, instead of the average value calculator, the current reference signal of each thyristor starter is input and a predetermined number-th largest current reference signal is selected. And an order selection circuit for outputting a target current reference signal.

In the third aspect of the present invention, the sequence selection circuit inputs the current reference signal of each thyristor starter, selects the predetermined largest current reference signal, outputs the target current reference signal, and outputs the unbalanced signal. The current compensator amplifies the deviation between the current reference signal and the target current reference signal obtained by the sequence selection circuit and outputs a drooping signal of the rotation speed set value. This balances the current reference signals of each thyristor starter.

According to a fourth aspect of the present invention, in the second aspect of the invention, the average value calculator is replaced by a device selection circuit for selecting a current reference signal of a predetermined thyristor starting device and outputting a target current reference signal. It is a thing.

In the invention of claim 4, the device selection circuit selects a current reference signal of a predetermined thyristor starting device and outputs a target current reference signal, and the unbalanced current compensator is obtained by the current reference signal and the device selection circuit. The deviation from the obtained target current reference signal is amplified and a drooping signal of the rotation speed set value is output. This balances the current reference signals of each thyristor starter.

According to a fifth aspect of the present invention, there is provided a forward converter for converting alternating current into direct current, an inverse converter for converting direct current output of the forward converter into alternating current power having a variable frequency and supplying the same to a synchronous machine, and a synchronous machine. A speed regulator that adjusts the current reference signal of the forward converter so that the rotation speed setting value and the rotation speed match, and a point that supplies the current reference signal and the converter current of the forward converter to the forward converter so that they match. A starter for a synchronous machine comprising two or more thyristor starters each having a current regulator for adjusting the timing of an arc pulse, wherein a current reference signal of each thyristor starter is input to calculate an average value. An average value calculator that outputs a real current reference signal and a current regulator that adjusts the timing of the firing pulse supplied to the forward converter so that the actual current reference signal and the converter current of the forward converter match. , Each thyristor starter It includes those were.

In the fifth aspect of the invention, the average value calculator inputs the current reference signal of each thyristor starter, calculates the average value and outputs the actual current reference signal, and the current regulator is the average value calculator. The timing of the firing pulse supplied to the forward converter is adjusted so that the obtained actual current reference signal and the converter current of the forward converter match. This balances the current reference signals of each thyristor starter.

According to a sixth aspect of the invention, in the fifth aspect of the invention, the current reference signal of each thyristor starting device is input instead of the average value calculator to select a predetermined number-th largest current reference signal. And an order selection circuit for outputting an actual current reference signal.

In the sixth aspect of the invention, the sequence selection circuit inputs the current reference signal of each thyristor starting device, selects a predetermined number-th largest current reference signal, outputs the actual current reference signal, and adjusts the current. The regulator adjusts the timing of the firing pulse supplied to the forward converter so as to match the actual current reference signal obtained by the sequence selection circuit with the converter current of the forward converter. This balances the current reference signals of each thyristor starter.

According to a seventh aspect of the present invention, in the fifth aspect of the invention, the average value calculator is replaced by a device selection circuit for selecting a current reference signal of a predetermined thyristor starting device and outputting an actual current reference signal. It is a thing.

In the invention of claim 7, the device selection circuit selects a current reference signal of a predetermined thyristor starting device and outputs an actual current reference signal, and the current regulator outputs the actual current reference signal obtained by the device selection circuit. The timing of the ignition pulse supplied to the forward converter is adjusted so as to match the converter current of the forward converter. This balances the current reference signals of each thyristor starter.

According to the invention of claim 8, a forward converter for converting alternating current into direct current, an inverse converter for converting direct current output of the forward converter into alternating current power having a variable frequency and supplying it to the synchronous machine, and a synchronous machine of the synchronous machine. A speed regulator that adjusts the current reference signal of the forward converter so that the rotation speed setting value and the rotation speed match, and a point that supplies the current reference signal and the converter current of the forward converter to the forward converter so that they match. A starting device for a synchronous machine equipped with two or more thyristor starting devices each having a current regulator for adjusting the timing of an arc pulse, wherein the converter current of the forward converter of each thyristor starting device is input and averaged. An average value calculator that calculates a value and outputs a target current reference signal, and an unbalanced current compensator that amplifies the deviation between the current reference signal and the target current reference signal and outputs a droop signal of the rotation speed setting value, respectively. Prepared for the thyristor starter of It is.

In the eighth aspect of the present invention, the average value calculator inputs the converter current of the forward converter of each thyristor starter, calculates the average value and outputs the target current reference signal, and the unbalanced current compensator. Outputs the drooping signal of the rotation speed set value by amplifying the deviation between the current reference signal and the target current reference signal obtained by the average value calculator. This balances the current reference signals of each thyristor starter.

According to a ninth aspect of the invention, in the eighth aspect of the invention, instead of the average value calculator, the converter current of the forward converter of each thyristor starter is input and a predetermined number-th largest converter. An order selection circuit for selecting a current and outputting a target current reference signal is provided.

In the ninth aspect of the invention, the sequence selection circuit inputs the converter current of the forward converter of each thyristor starter, selects the predetermined largest converter current, and outputs the target current reference signal. Then, the unbalanced current compensator amplifies the deviation between the current reference signal and the target current reference signal obtained by the order selection circuit, and outputs the droop signal of the rotation speed set value. This balances the current reference signals of each thyristor starter.

According to a tenth aspect of the invention, in the eighth aspect of the invention, instead of the average value calculator, a device for selecting a converter current of a forward converter in a predetermined thyristor starting device and outputting a target current reference signal. It is provided with a selection circuit.

According to the tenth aspect of the present invention, the device selection circuit selects the converter current of the forward converter in the predetermined thyristor starter to output the target current reference signal, and the unbalanced current compensator outputs the current reference signal and the device. The deviation from the target current reference signal obtained by the selection circuit is amplified and a drooping signal of the rotation speed set value is output. This balances the current reference signals of each thyristor starter.

[0039]

Embodiments of the present invention will be described below. FIG. 1 is a block diagram showing a first embodiment of the present invention. The first embodiment is different from the conventional example shown in FIG. 11 in that in the thyristor starting device 1a, its own current reference signal Ira and another thyristor starting device 1b.
Deviation detector 19a which inputs the current reference signal Irb and outputs the deviation signal dIa, and the unbalanced current compensator 20 which inputs the deviation signal dIa and amplifies and outputs the droop signal Sa.
a, a subtractor 21a for inputting the rotational speed set value Nra and the drooping signal sa and outputting the deviation signal thereof as the rotational speed reference signal Nrsa is additionally provided. The thyristor starting device 1b has a similar configuration.
Since other configurations are the same as those of the conventional example shown in FIG. 11, the same elements are denoted by the same reference numerals and the description thereof will be omitted.

In FIG. 1, the speed adjuster 11a increases or decreases the current reference signal Ira so that the rotation speed reference signal Nrsa and the rotation speed signal Nsa match. The same applies to the thyristor starting device 1b.

The unbalanced current compensator 20a of the thyristor starting device 1a reduces the speed reference signal Nrsa to reduce its own current reference signal when its own current reference signal Ira is larger than the current reference signal Irb of another thyristor starting device. It operates to reduce the signal Ira. On the contrary, when the self current reference signal Ira is smaller than the current reference signal Irb of the other thyristor starting device 1b, the speed reference signal N
It operates to increase rsa to increase its own current reference signal Ira.

The unbalanced current compensator 20b of the other thyristor starting device 1b also operates in exactly the same manner. As a result, the current reference signal Ira and the current reference signal Irb can be made substantially equal to each other, and the converter direct current Ida and the converter direct current I
It can be balanced with db.

As described above, according to the first embodiment, the current outputs of the two thyristor starting devices 1 for simultaneously controlling the speed of one synchronous machine can be balanced. Therefore, by doing so, if the heat dissipation design of the starting device is performed with this balanced current value, a smaller starting device can be realized.

Next, a second embodiment of the present invention will be described. FIG. 2 is a block diagram showing a second embodiment of the present invention. In the above-described first embodiment, the case where the speed control of one synchronous machine 2 is performed using the two thyristor starters 1a and 1b has been described, but in the second embodiment, one synchronous machine 2 is used. The speed of the synchronous machine 2 is controlled by two or more thyristor starters 1a to 1n. In FIG. 2, only the thyristor starting device 1a is shown, and the other thyristor starting devices 1b to 1n are the same as the thyristor starting device 1a and are omitted.

The difference between the second embodiment shown in FIG. 2 and the first embodiment shown in FIG. 1 is that the thyristor starting device 1a is a current reference signal Ira for all the thyristor starting devices 1a to 1n. ~ Irn is input, and an average value calculator 22a is provided for outputting an average value of these current reference signals Ira to Irn as a target current reference signal IAa. The deviation detector 19a receives the current reference signal Ira and the target current reference signal IAa and outputs the deviation signal dIa to the unbalanced current compensator 20a.

The unbalanced current compensator 20a of the thyristor starting device 1a, when its own current reference signal Ira is larger than the target current reference signal IAa, the speed reference signal Nrs.
When the current reference signal Ira of its own is smaller than the target current reference signal IAa, the speed reference signal Nr is reduced.
It operates to increase sa to increase its own current reference signal Ira. The unbalanced current compensators 20b to 20n of the other thyristor starting devices 1b to 1n perform the same operation. Therefore, since the target current reference signals IAa to IAn of the thyristor starting devices 1a to 1n are substantially the same, the current reference signals Ira to Irn of all the thyristor starting devices 1a to 1n can be substantially the same. The converter direct currents Ida to Idn can be balanced.

As described above, according to the second embodiment, it is possible to balance the current outputs of the plurality of thyristor starting devices 1a to 1n that simultaneously control the speed of one synchronous machine 2. By doing so, a smaller thyristor starting device can be realized by designing the heat dissipation of the thyristor starting device with this balanced current value.

FIG. 3 shows a third embodiment of the present invention. The third embodiment differs from the second embodiment shown in FIG. 2 in that instead of the average value calculator 22a, the current reference signals Ira-Ir of the respective thyristor starting devices 1a-1n.
n is input and a predetermined number-th largest current reference signal Iri
Is provided to output the target current reference signal IAa.

As a result, each thyristor starting device 1
Since the values of the target current reference signals IAa to IAn for a to 1n are the same, the same operation as that of the above-described second embodiment and the same effect can be obtained.

FIG. 4 shows a block diagram of the fourth embodiment of the present invention. The second embodiment differs from the second embodiment shown in FIG. 2 in that the average value calculator 22a is replaced by
It is provided with a device selection circuit 24a for selecting a current reference signal Iri of a predetermined thyristor starting device 1i and outputting a target current reference signal IAa.

That is, the device selection circuit 24a is configured so that all the thyristor starting devices 1 are replaced by the average value calculator 22a.
The current reference signals Ira to Irn of a to 1n are input, and the current reference signal Iri of the predetermined thyristor starting device 1i is selected from the current reference signals Ira to Irn.
Output as Aa.

As a result, each thyristor starting device 1
Since the values of the target current reference signals IAa to IAn for a to 1n are the same, the same operation and the same effect as the second embodiment can be obtained.

Next explained is the fifth embodiment of the invention. FIG. 5 is a block diagram showing the fifth embodiment of the present invention. In the fifth embodiment, as in the second to fourth embodiments, one synchronous machine 2 is used as the second machine.
The thyristor starting devices 1a to 1n are arranged to control the speed, and each thyristor starting device 1a to 1n is different from the conventional thyristor starting devices 1a to 1n shown in FIG. Current reference signals Ira to I
rn is input, the average value is calculated, and the actual current reference signal IT
The average value calculator 22a that outputs a is provided, and the current regulator 1
4a is the actual current reference signal I obtained by the average calculator 22a.
The timing of the ignition pulse supplied to the forward converter 4 is adjusted so that Ta matches the converter current Ida of the forward converter 4.

That is, the current regulator 14a inputs the actual current reference signal ITa obtained by the average value calculation circuit 22a and the converter current signal Isa, and the actual current reference signal ITa and the converter current signal Isa match. The forward converter phase control signal θr1a is increased or decreased so as to As a result, the actual current reference signals ITa to IT of all the thyristor starters 1a to 1n.
n can be matched and all converter direct currents Id
It is possible to balance a to Idn.

In FIG. 5, only the thyristor starting device 1a is shown. The configuration of the other thyristor starting devices 1b to 1n is the same as that of the thyristor starting device 1a, and is not shown.

FIG. 6 is a block diagram showing the sixth embodiment of the present invention. This sixth embodiment is shown in FIG.
Mean calculator 22a in the fifth embodiment shown in FIG.
Instead of inputting the current reference signals Ira to Irn of the thyristor starters 1a to 1n, the predetermined largest current reference signal Iri is selected to select the actual current reference signal ITa.
Is provided with a sequence selection circuit 23a for outputting
a is the actual current reference signal IT obtained by the sequence selection circuit 23a
The timing of the ignition pulse supplied to the forward converter 4 is adjusted so that a and the converter current Ida of the forward converter 4 match.

As a result, each thyristor starting device 1
It is possible to balance all the converter direct currents Ida to Idn of a to 1n.

FIG. 7 shows a block diagram of the seventh embodiment of the present invention. In the seventh embodiment, instead of the average value calculator 22a of the fifth embodiment shown in FIG. 5,
A device selection circuit 24a that selects the current reference signal Iri of the predetermined thyristor starting device 1i and outputs the actual current reference signal IAa is provided, and the current regulator 14a is the device selection circuit 24a.
The timing of the firing pulse supplied to the forward converter 4 is adjusted so that the actual current reference signal IAa obtained in step (4) and the converter current Isa of the forward converter 4 match. Thereby, the current reference signal Ira of each of the thyristor starting devices 1a to 1n.
~ Balance the Irn. Therefore, all the converter direct currents Ida of the respective thyristor starting devices 1a to 1n.
~ Idn can be balanced.

Next, an eighth embodiment of the present invention will be described. FIG. 8 shows a block diagram of the eighth embodiment of the present invention. In the eighth embodiment, instead of the respective current reference signals Ira to Irn input to the average value calculator 22a of the second embodiment shown in FIG. 2, the respective converter current signals Isa to Isr are replaced. Is input and the average value is taken.

That is, the average value calculator 22a inputs the converter currents Isa to Isn of the forward converter 4 of each of the thyristor starting devices 1a to 1n, calculates the average value thereof, and outputs the target current reference signal IAa. To do. Then, the unbalanced current compensator 20a outputs the current reference signal Ira and the target current reference signal I
The deviation from Aa is amplified and a drooping signal of the rotation speed setting value Nra is output. As a result, all the converter direct currents Ida to Idn of the thyristor starting devices 1a to 1n are balanced.

FIG. 9 is a block diagram showing the ninth embodiment of the present invention. This ninth embodiment is shown in FIG.
Instead of the average value calculator 22a of the eighth embodiment shown in FIG. 4, the forward converter 4 of each of the thyristor starting devices 1a to 1n is replaced.
Of the converter currents Isa to Isr are input to select the converter current Isi that is the largest in the predetermined number and the target current reference signal I is selected.
An order selection circuit for outputting Aa is provided, and the unbalanced current compensator 20a amplifies the deviation between the current reference signal Ira and the target current reference signal IAa obtained by the order selection circuit 23a and outputs a droop signal of the rotation speed setting value Nra. Output. Thereby, the current reference signal Ir of each of the thyristor starting devices 1a to 1n.
Balance a to Irn.

FIG. 10 is a block diagram showing the tenth embodiment of the present invention. The tenth embodiment is the average value calculator 22 of the eighth embodiment shown in FIG.
Instead of a, the converter currents Isa to Isn of the thyristor starting devices 1a to 1n are input, and the converter current Isi of the forward converter 4i in the predetermined thyristor starting device 1i is selected to set the target current reference signal IAa. A device selection circuit 24a for outputting is provided, and the unbalanced current compensator 20a amplifies a deviation between the current reference signal Ira and the target current reference signal IAa obtained by the device selection circuit 24a and outputs a drooping signal of the rotational speed setting value Nra. To do. As a result, the current reference signals Ira to Irn of the thyristor starting devices 1a to 1n are balanced.

[0063]

As described above, according to the present invention,
Since each current reference signal (rotation speed setting value) has a drooping characteristic so that there is no difference in the current reference signal between each thyristor starter, each thyristor starts even during speed control operation. The converter DC current of the device is balanced.

Therefore, the output current of each thyristor starter can be balanced with respect to the starter of the synchronous machine in which the speed of one synchronous machine is controlled by two or more thyristor starters. By designing the heat dissipation of each thyristor starter with the obtained current value, a smaller thyristor starter can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a sixth embodiment of the present invention.

FIG. 7 is a block configuration diagram showing a seventh embodiment of the present invention.

FIG. 8 is a block configuration diagram showing an eighth embodiment of the present invention.

FIG. 9 is a block configuration diagram showing a ninth embodiment of the present invention.

FIG. 10 is a block configuration diagram showing a tenth embodiment of the present invention.

FIG. 11 is a block diagram showing a conventional example.

[Explanation of symbols] 1 starter 2 synchronous machine 3 input transformer 4 forward converter 5 DC reactor 6 inverse converter 7 AC reactor 8 breaker 9 speed pulse generator 10 speed detector 11 speed regulator 12 current detector 13 Current transformer 14 Current regulator 15 Forward converter Pulse generator 16 Forward converter Synchronous power transformer 17 Inverter pulse generator 18 Inverse transformer Synchronous power transformer 19 Deviation detector 20 Immutable current compensator 21 Subtractor 22 Average value calculator 23 Sequence selection circuit 24 Device selection circuit

Claims (10)

[Claims] 1. A forward converter for converting alternating current into direct current, an inverse converter for converting direct current output of the forward converter into alternating current power having a variable frequency and supplying the same to a synchronous machine, and a rotational speed setting of the synchronous machine. A speed regulator that adjusts the current reference signal of the forward converter so as to match the value and the rotation speed, and the forward converter so as to match the current reference signal and the converter current of the forward converter. In a synchronous machine starter equipped with two thyristor starters equipped with a current adjuster for adjusting the timing of the supplied ignition pulse, a deviation between the current reference signal and the current reference signal of another thyristor starter is determined. An unbalanced current compensator that amplifies and outputs a drooping signal of the rotational speed setting value is provided in each of the thyristor starting devices. 2. A forward converter for converting AC into DC, an inverse converter for converting DC output of the forward converter into AC power of variable frequency and supplying the AC power to a synchronous machine, and a rotational speed setting of the synchronous machine. A speed regulator that adjusts the current reference signal of the forward converter so as to match the value and the rotation speed, and the forward converter so as to match the current reference signal and the converter current of the forward converter. In a starter for a synchronous machine having two or more thyristor starters each having a current regulator for adjusting the timing of an ignition pulse to be supplied, an average value is obtained by inputting the current reference signal of each of the thyristor starters. And an unbalanced current compensator that amplifies the deviation between the current reference signal and the target current reference signal and outputs a droop signal of the rotation speed setting value. , Each of the above A starter for a synchronous machine, which is provided in an iris starter. 3. A target current reference signal is output by inputting the current reference signal of each of the thyristor starters instead of the average value calculator and selecting a predetermined number-th largest current reference signal. The starter for a synchronous machine according to claim 2, further comprising a sequence selection circuit. 4. A device selection circuit for selecting the current reference signal of a predetermined thyristor starting device and outputting the target current reference signal, instead of the average value calculator. The synchronous machine starting device described in 1. 5. A forward converter for converting alternating current into direct current, an inverse converter for converting direct current output of the forward converter into alternating current power having a variable frequency and supplying the same to a synchronous machine, and a rotational speed setting for the synchronous machine. A speed regulator that adjusts the current reference signal of the forward converter so as to match the value and the rotation speed, and the forward converter so as to match the current reference signal and the converter current of the forward converter. In a synchronous machine starter equipped with two or more thyristor starters equipped with a current adjuster for adjusting the timing of an ignition pulse to be supplied, an average value is obtained by inputting the current reference signals of the respective thyristor starters. And an average value calculator that outputs a real current reference signal and the timing of the firing pulse supplied to the forward converter so that the real current reference signal and the converter current of the forward converter match. Current regulator And a starting device for a synchronous machine, comprising: 6. Instead of the average value calculator, the current reference signal of each of the thyristor starting devices is input, a predetermined number-th largest current reference signal is selected, and the actual current reference signal is output. The starting device for a synchronous machine according to claim 5, further comprising an order selection circuit. 7. A device selection circuit for selecting the current reference signal of a predetermined thyristor starting device and outputting the actual current reference signal instead of the average value calculator. The synchronous machine starting device described in 1. 8. A forward converter for converting alternating current into direct current, an inverse converter for converting direct current output from the forward converter into alternating current power having a variable frequency and supplying the same to a synchronous machine, and a rotational speed setting for the synchronous machine. A speed regulator that adjusts the current reference signal of the forward converter so as to match the value and the rotation speed, and the forward converter so as to match the current reference signal and the converter current of the forward converter. In a synchronous machine starter equipped with two or more thyristor starters equipped with a current adjuster for adjusting the timing of the supplied ignition pulse, the converter current of the forward converter of each of the thyristor starters is input. An average value calculator for calculating an average value and outputting a target current reference signal, and an unbalanced current compensation for amplifying a deviation between the current reference signal and the target current reference signal and outputting a drooping signal of the rotation speed set value. And each of the above A starting device for a synchronous machine, which is provided in the thyristor starting device of. 9. The target current reference signal is selected by inputting a converter current of a forward converter of each of the thyristor starting devices instead of the average value calculator and selecting a predetermined largest converter current. 9. The synchronous machine starting device according to claim 8, further comprising a sequence selection circuit for outputting 10. A device selection circuit for selecting the converter current of a forward converter in a predetermined thyristor starting device and outputting the target current reference signal signal instead of the average value calculator. The starting device for a synchronous machine according to claim 8.