CO-FREQUENCY CONTROL STRATEGY OF TRANSMISSION AND DISTRIBUTION FLOW OF SOLAR COLLEECTOR FIELD AND PHOTOVOLTAIC IN DISTRICT SOLAR HEATING SYSTEM
This paper proposes a new control strategy based on photovoltaic power generation response to solar irradiance changes,and taking the real-time power generation of the photovoltaic system as the standard to drives the operation of the water pump in the SCF,then controlling the transmission and distribution flow and effective heat collection.The energy-saving operation effect of the proposed SCF flow control strategy is obtained through the calculation and analysis,and compared with the traditional constant flow control and constant outlet temperature control method.The results show that the proposed flow control strategy of the solar collector field has the best economic and thermal performance.Under the proposed control method,the unit heat cost(ηUHC)of the solar collector field can reach 0.0405 ¥/kWh,and the constant flow and constant outlet temperature control methods are 0.0455 ¥/kWh and 0.0446 ¥/kWh respectively.In addition,the thermal efficiency in the heating season can reach 52.44%,which is higher than 52.43% of the constant flow control method and 48.78% of the constant collector outlet temperature control method.
solar collectorsflow controlphotovoltaic systemeconomic performancethermal performance
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