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Zawartość zarchiwizowana w dniu 2022-12-27

LOAD MANAGEMENT SYSTEM FOR ELECTRIC POWER DISTRIBUTION

Cel

To develop and demonstrate a new concept, and technology for the levelling of electricity consumption load curve on power plants. The system offers inexpensive energy (electricity) to the electricity company via equipment installed at the consumer's residence.
Progress of the project is in accordance with the project master plan.
Preliminary result analysis has shown a positive consumer reation towards a differentiated tariff system resulting in an appreciable change in consuming behaviour among the smaller electricity consumers.
Results of field trials of the data transmission network program have indicated that two-way transmission will be possible from any point in a 380/220V distribution network to another and on 10KV lines between a 50/10KV transformer station and a 10KV/380V distribution transformer.
Data transmission between the 10KV network and the 380V network will be via a repeater/concentrator placed on or nearby the distribution transformer. The frequency range used was 5 to 15 khz with a maximum power level of around 150W. It is possible that this system will be in conflict with a forthcoming international standard concerning this type of signal transmission, especially with regard to signal level.
A possible problem currently being investigated is that of audiable noise from the transmission system in the 5 to 15 KHZ frequency range.
Implementation of version 2 of the tariff computer was started on 01/09/87 as it was estimated that sufficient information had been collected and evaluated to start the critical design review.
Work on the next generation of the operational centre will be delayed until the results from the design review of the tariff computer are available.
The household control system installations have generally proven satisfactory but have also revealed some weaknesses;
A) Missing function at the low end of the designed temperature range (0 to 40 Deg.C.).
B) Missing function in some types of installations.
C) Short unit lifetime in installations with electrical transients. These problems must be resolved by the manufacturer before full-scale production is commenced.
The focus of the project is the demonstration of a new system of load management: the key concept is consumer management of energy consumption.
Participating consumers are provided with tariff information and the equipment necessary to control energy loads. This local load management equipment operates automatically and is installed or changed easily.
The main elements of the system are:
- operational centre;
- data transmission network based on a public data network and power distribution networks, 10KV and 380/220/ V lines;
- tariff computers connected to existing power meters;
- equipment for load control at the consumers premises.
DATA TRANSMISSION NETWORK
Transmission is possible on existing power lines on the following frequencies: Band 1 - 20kHz/40DkHz;
Band 2 - 3kHz/15kHz. A narrowband modulation technique (eg. FSK) will be used within both bands. The necessary redundancy will be obtained by means of a multichannel link. Band rates on power distribution lines will be automatically adjustable up to 300 baud. Transmitted power level for a system operating in Band 1 will be 10-50W; Band 2 will use 50-500W.
TARIFF COMPUTER
This is composed of two physically separated units: a registration and calculation unit (RCU) and a presentation and interface unit (PIU). The RCU is designed for monitoring close to the normal Ferraris Meter in the standard electricity meter box used in Denmark. It has a direct interface with the meter, no display facilities and protection against electromagnetic, mechanical and thermal interface especially unauthorised attempts to alter the reading of the internal registers. The RCU communicates relevant information to the consumer through an "Info-Line" to the PIU.
The PIU should be mounted in an accessible location for the consumer: it has a 2 x 16 character alphanumeric display and 3 push buttons. It contains a 4-bit relay output for local management of power consumption. These outputs may be used directly (for loads up to 10 Amps), indirectly via contractors or remotely by the control system using signal transmission on existing cables.
The project cost an estimated DKr 22 million.

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Koordynator

SOREN T.LYNGSOE
Wkład UE
Brak danych
Adres
OSTMARKEN 4
2860 SOBORG COPENHAGEN
Dania

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