| 摘要 |
FIELD: heat-power engineering, possible use in electric power systems using electric heaters of electric boiler type. ^ SUBSTANCE: in the method for controlling power of electric heating system and in the device for its realization, at beginning stage after enabling of electric heating system, on basis of greatest current value of one of electric heater sections which has exceeded maximal set value, control command is given for enabling the pump and heat carrier is cooled down to value of greatest current in one of sections below the minimal given value. Control command for pump disabling is given and heat carrier is heated up. The cycle is repeated until the temperature of heat carrier at outlet of electric heaters reaches value which exceeds temperature setting and positive temperature hysteresis. Command is given for disabling all heater sections and the pump is enabled and disabled for a time interval of several dozen seconds. Commands are outputted for controlling heater sections, with each one of which an independent negative temperature hysteresis is matched on basis of information received from temperature sensors are inlet and outlet of electric heaters and from room air temperature sensors, when for maintenance of given heat carrier or air temperature firstly one section of electric heaters is enabled and if the power of one section is insufficient for heating the heat carrier or air up to appropriate temperature, second section is enabled, and third one if necessary, etc. The pump is enabled for several seconds before enabling the electric heater section and disabled with a delay of several dozen seconds after disabling of electric heater sections. During operation, consumption current readings are taken for every electric heater section as well as time of its operation in enabled state, aforementioned readings are analyzed and conclusions are derived about efficiency of the system in terms of heating costs. ^ EFFECT: increased speed of operation, increased efficiency, increased reliability of operation. ^ 5 dwg |
