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Thyristor starting device

A technology of starting device and thyristor, which is applied in the direction of starting device, output power conversion device, motor generator/starter, etc., and can solve the problem of the reduction of synchronous machine's rise rate, the change of synchronous machine torque, and the time spent on starting of synchronous machine, etc. problem, to achieve the effect of improving stability and improving followability

Active Publication Date: 2020-09-25
TOSHIBA MITSUBISHI-ELECTRIC IND SYST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the torque of the synchronous machine fluctuates every time a commutation command of the inverter is generated, and the speed control of the synchronous machine may become unstable.
In addition, since the rate of increase of the synchronous machine (the rate of increase in the rotational speed) is reduced, it may take time to start the synchronous machine.

Method used

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  • Thyristor starting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0034] figure 1 It is a circuit block diagram showing the configuration of the thyristor starting device according to Embodiment 1 of the present invention. refer to figure 1 , The thyristor starting device 100 according to Embodiment 1 starts the synchronous machine 20 by accelerating the stopped synchronous machine 20 to a predetermined rotation speed.

[0035] Synchronous machine 20 includes a stator with armature windings ATU, ATV, ATW, and a rotor with field winding 22 . The synchronous machine 20 is coupled with, for example, a gas turbine in a thermal power plant, and is driven to rotate by the gas turbine. In the following description, the predetermined rotational speed is also referred to as "rated rotational speed".

[0036] The thyristor starting device 100 is connected to the secondary side of the transformer TR. The primary side of transformer TR is connected to AC power supply 30 . The transformer TR converts the three-phase AC voltage supplied from the AC p...

Embodiment approach 2

[0124] In the thyristor starting device 100 according to the second embodiment, when the PI calculation is restarted immediately after the off time, the actual measurement value of the DC voltage VDC2 input to the inverter 2 before the off time is used as an integral element after the off time default value.

[0125] Specifically, the current control unit 15 uses the voltage detector 19 ( Figure 12 ) The detected DC voltage VDC2 is used as the preset value of the integral term after the rest time. That is, in the integrator of the current control unit 15 , the actual measurement value of the DC voltage VDC2 before the rest time Δt becomes the preset value of the integral term after the rest time Δt.

[0126] Next, use Figure 12 as well as Figure 13 Control of converter 1 in thyristor starting device 100 according to this embodiment will be described.

[0127] Figure 12 It is a functional block diagram showing the configuration of the converter control unit 13 included...

Embodiment approach 3

[0138] In the thyristor starting device 100 according to the third embodiment, based on the three-phase AC voltages VU, VV, VW detected by the voltage detector 6 and the gate pulse (trigger command) given to the gate circuit of the thyristor of the inverter 2 The DC voltage VDC2 between the input terminals 2a and 2b of the inverter 2 is calculated. Also, when the PI calculation is restarted immediately after the rest time, the calculated DC voltage VDC2 is used as a preset value of the integral element after the rest time Δt.

[0139] as in figure 1 As described in , the voltage detector 6 is configured to detect two line-to-line voltages among the line-to-line voltages of the three-phase AC voltages VU, VV, and VW supplied from the inverter 2 to the synchronous machine 20 (in figure 1 In the example, the line voltage VU-VV, VV-VW) is detected. On the other hand, the inverter 2 is constituted as image 3 as well as Figure 4 One of the thyristors U, V, W and one of the thy...

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Abstract

A converter control unit (13) that controls the ignition phase of a converter (1) generates a voltage command value of an output voltage of the converter (1) by performing control calculation on a deviation so as to include at least an integral element for integrating a deviation of a DC current from a current command value. In a first mode where commutation of the inverter (2) is performed by intermittently setting the DC current to zero, the converter control unit (13) is configured to maintain the DC current at zero during a prescribed pause time period by narrowing a phase control angle simultaneously with a commutation command of the inverter (2). When the control calculation is resumed immediately after the pause, the converter control unit (13) uses a control amount calculated through the control calculation immediately before the pause time period, as a preset value of the integral element immediately after the pause time period.

Description

technical field [0001] The invention relates to a thyristor starting device. Background technique [0002] A thyristor starter for starting synchronous machines such as a generator and a motor is being developed (for example, refer to International Publication No. 2014 / 033849 (Patent Document 1)). The thyristor starting device includes a converter that converts AC power to DC power, a DC reactor that smoothes the DC power, and converts the DC power supplied from the converter through the DC reactor into variable-frequency AC power and supplies it to the synchronous machine. supplied by the inverter. By controlling the AC power supplied to the synchronous machine, the stopped synchronous machine can be started and driven at a predetermined rotational speed. [0003] Patent Document 1: Specification of International Publication No. 2014 / 033849 [0004] In the thyristor starting device described above, since the induced voltage generated in the synchronous machine at the tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06
CPCH02P1/46H02P27/06H02P2201/13H02P6/20H02M7/48H02M7/12H02P6/16H02P6/17H02P6/28H02M7/1552H02M7/525H02P25/026
Inventor 川口裕敬荻野宏之松本泰明安藤彰修
Owner TOSHIBA MITSUBISHI-ELECTRIC IND SYST CORP