THE WAY OF DISTRICT HEATING OUTPUT CONTROL BY MEANS OF HYDROTHERMAL POWER SYSTEMS – THREE MODIFICATIONS

District Heating Systems (DHS) are being developed in large cities in accordance with their growth. The DHS are formed by enlarging networks of heat distribution to consumers and at the same time they interconnect the heat sources gradually built. DHS is used in larger cities of some European countries e.g. in Germany, France, Denmark, Finland, Sweden, Austria, Czech Republic, Poland and others. Production technology of heat by means of combined production of power and heat (CHP) is an important way to increasing of thermal efficiency of closed thermal loop. The paper shows the system access to the control of extensive DHS -controlled plant. It concerns automatic control of technological string :production, transport + distribution, consumption” of extensive district heating and that is the contribution of this paper. Control by means of advanced control algorithms is a tool (up to now neglect) for decreasing consumption of energy and increasing the level of environment protection. The paper deals with brief description of three modifications of the way of control of hot-water piping heat output at simultaneous operation of qualitative and also quantitative parts of control.