EPE Association: EPE 1985 - 25 - Lecture Session 4.1: TOPIC 4

EPE 1985 - 25 - Lecture Session 4.1: TOPIC 4
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1985 - Conference > EPE 1985 - 25 - Lecture Session 4.1: TOPIC 4

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   LIMITATION OF OVERVOLTAGES BY STATIC COMPENSATORS WITH TCR AND TCSR
By C. Tuttas [View]
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Abstract: Static VAR compensators (SVC) are used in electrical transmission systems, to improve system behaviour. One application is the limitation of overvoltages. In this paper the problem of overvoltages is reduced to overvoltages with fundamental frequency, caused for instance by load rejections. SVC with Thyristor Controlled Reactors (TCR) and Thyristor Controlled Saturated Reactors (TCSR) are able to reduce these overvoltages. It is shown by digital simulation, that SVC with TCSR have a better overload capability than those working with TCR. As a second advantage the rated power of the TCSR thyristor valves is much lower compared with the valves of a TCR.

   CHARACTERISTICS AND CONTROL OF GTO CONVERTER
By H. Sakata; S. Isomura; E. Masada [View]
[Download]

Abstract: Thyristor converters are installed in H.V.D.C. stations, d.c. sources, solar power conversion systems, etc. But the lag current flows due to line commutation and reactive power is necessarily involved. While a converter usinq Gate Turn Off thyristor (GTO converter) can operate under the neqative phase anqle, so the lead current flows. We made a model GTO converter controlled by a microcomputer, and obtained reasonable characteristics. The experimental results show that a GTO converter connected in series to a thyristor converter can compensate the reactive power.

   STATIC VAR COMPENSATOR WITH ASYNCHRONOUS GENERATOR WITH OR WITHOUT CONNECTION TO THE NETWORK
By L. Serrano Iribarnegaray; S. Bahilo Ambrosio; A. Cervera Vicente; M. Riera Guasp [View]
[Download]

Abstract: In this article we discuss the design and functioning of an electrical system which allows either of the two following objectives to be achieved:
A) When functioning without connection to the network, it generates electrical energy at an electronically controlled voltage and frequency so as to meet emergency needs (it is assumed, that these needs are basically constituted by loads with cos 0,8 inductive, such as a lighting system and other similar cases).
B) In connection with the network, that is, in non-emergency situations, the system injects electrical energy into the network, taking advantage of the residual calories of the industry in which it is installed and at the same time very quickly corrects the installation's power factor.
The system basically consists of an asynchronous induction machine, a compensator for reactive power (S.V.C.), and the electronic circuits for control of the entire system. It will be useful in industries which fulfil the following conditions:
- Availability of residual calories useful for the generation of electrical power.
- Needs of an emergency system.
- Needs of compensation of reactive power.
Also, an analysis of the induction machine functioning as generator is given from a physical point of view and finally the results of testing a 15CV prototype built by the authors are exposed.

   USER EXPERIENCE WITH AC DRIVES IN THE OIL INDUSTRY
By G. M. McIlwrick [View]
[Download]

Abstract: This paper addresses itself to a description of a number of applications of AC variable speed drives to installations within the oil Industry. This industry it will be appreciated has the added problem of working in a potentially hazardous atmosphere which places restrictions on the applications as will be described. The equipment now available has attractions to the oil industry user due to the flexibility of power output and speed together with energy conservation, all of which are considered. Finally the equipment must provide reliability and security for the plant in which it operates and this topic will also be discussed.

   ALTERNATE COMPONENTS IN THE SIGNALING CURRENT DUE TO STATIC CONVERTERS AND ELECTRONIC CONTROL EQUIPMENTS
By P. Stiriti; D. Lonardoni [View]
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Abstract: After a review of the production of harmonics in circuits fed or controlled by diodes and thyristors, a series of tests is illustrated that was carried out on the FERROVIE NORD MILANO' s network, in view of the introduction into service of a set of new electric motor-coaches fitted with chopper equipment, in order to find out whether or not the possibility of interference between said harmonics and the signalling current did in fact exist. A first series of tests was carried out (1982), and a second series (1984), using two chopper equipped electric motor-coaches. The test results were very comforting, for it was found that both the substation and the converters on board the motor-coaches do produce some harmonics in the track, that could interfere with the signaling currents, but said harmonics are not able to activate the safety equipment.

   HIGH SPEED REACTIVE POWER COMPENSATION
By P. Fabijanski; K. Stankowski [View]
[Download]

Abstract: The article presents two versions of circuits with current inverter which enables the compensation of reactive power in the 3-phase supply systems. The article gives equations describing currents and voltages on the different elements of the both circuits and the results of circuits simulation on the computer.

EPE 1985 - 25 - Lecture Session 4.1: TOPIC 4
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1985 - Conference > EPE 1985 - 25 - Lecture Session 4.1: TOPIC 4
	[return to parent folder]

	LIMITATION OF OVERVOLTAGES BY STATIC COMPENSATORS WITH TCR AND TCSR By C. Tuttas	[View] [Download]
Abstract: Static VAR compensators (SVC) are used in electrical transmission systems, to improve system behaviour. One application is the limitation of overvoltages. In this paper the problem of overvoltages is reduced to overvoltages with fundamental frequency, caused for instance by load rejections. SVC with Thyristor Controlled Reactors (TCR) and Thyristor Controlled Saturated Reactors (TCSR) are able to reduce these overvoltages. It is shown by digital simulation, that SVC with TCSR have a better overload capability than those working with TCR. As a second advantage the rated power of the TCSR thyristor valves is much lower compared with the valves of a TCR.

	CHARACTERISTICS AND CONTROL OF GTO CONVERTER By H. Sakata; S. Isomura; E. Masada	[View] [Download]
Abstract: Thyristor converters are installed in H.V.D.C. stations, d.c. sources, solar power conversion systems, etc. But the lag current flows due to line commutation and reactive power is necessarily involved. While a converter usinq Gate Turn Off thyristor (GTO converter) can operate under the neqative phase anqle, so the lead current flows. We made a model GTO converter controlled by a microcomputer, and obtained reasonable characteristics. The experimental results show that a GTO converter connected in series to a thyristor converter can compensate the reactive power.

	STATIC VAR COMPENSATOR WITH ASYNCHRONOUS GENERATOR WITH OR WITHOUT CONNECTION TO THE NETWORK By L. Serrano Iribarnegaray; S. Bahilo Ambrosio; A. Cervera Vicente; M. Riera Guasp	[View] [Download]
Abstract: In this article we discuss the design and functioning of an electrical system which allows either of the two following objectives to be achieved: A) When functioning without connection to the network, it generates electrical energy at an electronically controlled voltage and frequency so as to meet emergency needs (it is assumed, that these needs are basically constituted by loads with cos 0,8 inductive, such as a lighting system and other similar cases). B) In connection with the network, that is, in non-emergency situations, the system injects electrical energy into the network, taking advantage of the residual calories of the industry in which it is installed and at the same time very quickly corrects the installation's power factor. The system basically consists of an asynchronous induction machine, a compensator for reactive power (S.V.C.), and the electronic circuits for control of the entire system. It will be useful in industries which fulfil the following conditions: - Availability of residual calories useful for the generation of electrical power. - Needs of an emergency system. - Needs of compensation of reactive power. Also, an analysis of the induction machine functioning as generator is given from a physical point of view and finally the results of testing a 15CV prototype built by the authors are exposed.

	USER EXPERIENCE WITH AC DRIVES IN THE OIL INDUSTRY By G. M. McIlwrick	[View] [Download]
Abstract: This paper addresses itself to a description of a number of applications of AC variable speed drives to installations within the oil Industry. This industry it will be appreciated has the added problem of working in a potentially hazardous atmosphere which places restrictions on the applications as will be described. The equipment now available has attractions to the oil industry user due to the flexibility of power output and speed together with energy conservation, all of which are considered. Finally the equipment must provide reliability and security for the plant in which it operates and this topic will also be discussed.

	ALTERNATE COMPONENTS IN THE SIGNALING CURRENT DUE TO STATIC CONVERTERS AND ELECTRONIC CONTROL EQUIPMENTS By P. Stiriti; D. Lonardoni	[View] [Download]
Abstract: After a review of the production of harmonics in circuits fed or controlled by diodes and thyristors, a series of tests is illustrated that was carried out on the FERROVIE NORD MILANO' s network, in view of the introduction into service of a set of new electric motor-coaches fitted with chopper equipment, in order to find out whether or not the possibility of interference between said harmonics and the signalling current did in fact exist. A first series of tests was carried out (1982), and a second series (1984), using two chopper equipped electric motor-coaches. The test results were very comforting, for it was found that both the substation and the converters on board the motor-coaches do produce some harmonics in the track, that could interfere with the signaling currents, but said harmonics are not able to activate the safety equipment.

	HIGH SPEED REACTIVE POWER COMPENSATION By P. Fabijanski; K. Stankowski	[View] [Download]
Abstract: The article presents two versions of circuits with current inverter which enables the compensation of reactive power in the 3-phase supply systems. The article gives equations describing currents and voltages on the different elements of the both circuits and the results of circuits simulation on the computer.