EPE Association: EPE 1989 - 09 - Lecture Session 2.2: ELECTRONIC POWER ACTUATORS

EPE 1989 - 09 - Lecture Session 2.2: ELECTRONIC POWER ACTUATORS
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   NONLINEAR BEHAVIOUR OF VOLTAGE SOURCE INVERTERS WITH POWER TRANSISTORS
By A. Weschta; W. Weberskirch [View]
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Abstract: The output voltage of voltage source inverter (VSI) differs appreciably from the reference voltage due to the switching performance and the on-state voltage of power semiconductors. The logic control circuit used to prevent a dc link short circuit also plays a part in these nonlinearities. Familiar space vector theory can be successfully used to describe these effects very clearly. The extent of waveform distortion depends on the type of base drive unit and logic control circuit. Data is presented for bipolar transistors (BIP), field-effect transistors (FET), and insulated gate bipolar transistors (IGBT). Finally, the paper presents several compensation methods. The optimum method uses digital voltage control with dead-beat response.

   INSTANTANEOUS SPATlAL VECTOR CONTROLLED MOTOR DRIVE SYSTEM USING DSP'S AND SI-THYRISTORS
By T. Koga; S. Sugawara; H. Hayashi; E. Kijima; Y. Ohmori [View]
[Download]

Abstract: This paper discusses the application of SI-thyristors and DSP's to the instantaneous spatial vector controlled motor drive inverter and its' basic performance test. The result led to persuade us that thus controlled inverter is suitable for driving the large output motor because of its higher torque response speed, reduction of ripples in flux, torque and current, and low noise.

   2 STAGES DC-AC LF 8 KVA POWER CONVERTER WITH THYRISTORS AND DUAL THYRISTORS
By François Bernot; Alain Berthon; Jean-Marie Kauffmann [View]
[Download]

Abstract: The aim of this paper is the description of an interesting two stages DC-AC LF (direct voltage to alternative at low frequency) power converter of 8 kVA, designed as a model for a 500 kVA with 40 outputs one. The first stage is a dual thyristors inverter, coupled to an 8 SCR cyclo-converter. Multiple DC or AC outputs can be realised with other second stages. The low switching losses, and the high frequency of the intermediate voltage provide a compact and realiable device. This paper presents the ideal behaviour compared with the real one, with various loads. The construction problems as switches protection, output filtering, wiring, are also presented. Finally the design of a multiple outputs converter is presented.

   NEW POSSIBILITIES FOR DC-SIDE COMMUTATED INVERTER CIRCUITS
By Klaus E. Bornhardt [View]
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Abstract: With the development of power transistors and GTOs, the traditional thyristor and the associated pulse-commutation circuits are being replaced. However, the high turn-off losses of these devices have been an incentive for the development of new resonant circuits on one side and for its application with an additional commutation circuit on the other side. Thus, the voltage is applied to the device after its switching-off, therefore with very low turn-off losses. So, the pulse-commutation configurations known from the thyristor circuits have as a new purpose not to assure the turn-off time of the thyristors, but to permit a zero-voltage switching. The commutation circuits are now analyzed from a new point of view, considering high switching frequency, low switching losses and times, and low cost. It is shown, that DC-side commutated inverter circuits, earlier only used with low switching frequency, can present lower switching losses, cost and volume, especially with high switching frequencies. A comparative study of different DC-side commutated circuits is presented together with a control method which minimizes the switching losses in the inverter.

   A METHOD FOR REDUCING HARMONICS IN OUTPUT VOLTAGES OF DOUBLE CONNECTED INVERTER
By Shoji Iida; Junichi Shimomura; Shigeo Masukawa; Shota Miyairi; Yasuyuki Nishida [View]
[Download]

Abstract: A new effective method for reducing harmonics involved in output voltages of the voltage source inverter is proposed. This method is based on the sophisticated utilization of the auxiliary single phase push-pull inverter. The features of this method can be considered to be very simple and very economical in circuit configuration in spite of distinguished effectiveness for reducing harmonics. For example, by adding only two switching elements and an auto-transformer with three taps to the 6-step inverter, the proposed circuit behaves as a 24-step inverter in regard to the harmonics involved in the output voltages, neither with multi-sequential or multi-parallel divisions nor a phase-shifting transformer. In this paper, the basic theories of the proposed inverter in emphasizing the analysis of the waveforms of output voltages are treated, and the optimum parameters of the circuit are searched.

EPE 1989 - 09 - Lecture Session 2.2: ELECTRONIC POWER ACTUATORS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1989 - Conference > EPE 1989 - 09 - Lecture Session 2.2: ELECTRONIC POWER ACTUATORS
	[return to parent folder]

	NONLINEAR BEHAVIOUR OF VOLTAGE SOURCE INVERTERS WITH POWER TRANSISTORS By A. Weschta; W. Weberskirch	[View] [Download]
Abstract: The output voltage of voltage source inverter (VSI) differs appreciably from the reference voltage due to the switching performance and the on-state voltage of power semiconductors. The logic control circuit used to prevent a dc link short circuit also plays a part in these nonlinearities. Familiar space vector theory can be successfully used to describe these effects very clearly. The extent of waveform distortion depends on the type of base drive unit and logic control circuit. Data is presented for bipolar transistors (BIP), field-effect transistors (FET), and insulated gate bipolar transistors (IGBT). Finally, the paper presents several compensation methods. The optimum method uses digital voltage control with dead-beat response.

	INSTANTANEOUS SPATlAL VECTOR CONTROLLED MOTOR DRIVE SYSTEM USING DSP'S AND SI-THYRISTORS By T. Koga; S. Sugawara; H. Hayashi; E. Kijima; Y. Ohmori	[View] [Download]
Abstract: This paper discusses the application of SI-thyristors and DSP's to the instantaneous spatial vector controlled motor drive inverter and its' basic performance test. The result led to persuade us that thus controlled inverter is suitable for driving the large output motor because of its higher torque response speed, reduction of ripples in flux, torque and current, and low noise.

	2 STAGES DC-AC LF 8 KVA POWER CONVERTER WITH THYRISTORS AND DUAL THYRISTORS By François Bernot; Alain Berthon; Jean-Marie Kauffmann	[View] [Download]
Abstract: The aim of this paper is the description of an interesting two stages DC-AC LF (direct voltage to alternative at low frequency) power converter of 8 kVA, designed as a model for a 500 kVA with 40 outputs one. The first stage is a dual thyristors inverter, coupled to an 8 SCR cyclo-converter. Multiple DC or AC outputs can be realised with other second stages. The low switching losses, and the high frequency of the intermediate voltage provide a compact and realiable device. This paper presents the ideal behaviour compared with the real one, with various loads. The construction problems as switches protection, output filtering, wiring, are also presented. Finally the design of a multiple outputs converter is presented.

	NEW POSSIBILITIES FOR DC-SIDE COMMUTATED INVERTER CIRCUITS By Klaus E. Bornhardt	[View] [Download]
Abstract: With the development of power transistors and GTOs, the traditional thyristor and the associated pulse-commutation circuits are being replaced. However, the high turn-off losses of these devices have been an incentive for the development of new resonant circuits on one side and for its application with an additional commutation circuit on the other side. Thus, the voltage is applied to the device after its switching-off, therefore with very low turn-off losses. So, the pulse-commutation configurations known from the thyristor circuits have as a new purpose not to assure the turn-off time of the thyristors, but to permit a zero-voltage switching. The commutation circuits are now analyzed from a new point of view, considering high switching frequency, low switching losses and times, and low cost. It is shown, that DC-side commutated inverter circuits, earlier only used with low switching frequency, can present lower switching losses, cost and volume, especially with high switching frequencies. A comparative study of different DC-side commutated circuits is presented together with a control method which minimizes the switching losses in the inverter.

	A METHOD FOR REDUCING HARMONICS IN OUTPUT VOLTAGES OF DOUBLE CONNECTED INVERTER By Shoji Iida; Junichi Shimomura; Shigeo Masukawa; Shota Miyairi; Yasuyuki Nishida	[View] [Download]
Abstract: A new effective method for reducing harmonics involved in output voltages of the voltage source inverter is proposed. This method is based on the sophisticated utilization of the auxiliary single phase push-pull inverter. The features of this method can be considered to be very simple and very economical in circuit configuration in spite of distinguished effectiveness for reducing harmonics. For example, by adding only two switching elements and an auto-transformer with three taps to the 6-step inverter, the proposed circuit behaves as a 24-step inverter in regard to the harmonics involved in the output voltages, neither with multi-sequential or multi-parallel divisions nor a phase-shifting transformer. In this paper, the basic theories of the proposed inverter in emphasizing the analysis of the waveforms of output voltages are treated, and the optimum parameters of the circuit are searched.