The grids are facing the critical issue concerning the power imbalance. Demand response (DR) program are increasingly promoted to encourage the end-users to change their load profiles under a specified pricing policy or request of the grid. For buildings, the supply-based fast demand response strategy has been demonstrated that it can quickly response to the urgent request from smart grid and can reduce the load demand within very short interval. However, flow sensors are required for each air conditioning terminal equipment. In view of the high cost of flow sensors and the large number of airconditioning terminal equipment, there are few cases of installing flow sensors for air-conditioning terminal equipment in existing large public buildings. Therefore, it hinders the application of this method in practical projects. This study aims at developing an improved fast demand response strategy of building HVAC system with low cost measurement sensors for smart grid applications. The virtual flow meter was modelled to estimate the water flow rate of each AHU based on theair side measurements. Meanwhile, a modified selfadjustment chilled water distribution method was developed to realize the balanced distribution of cooling capacity in different indoor zones, which does not require additional work to offline identify the key parameters prior to application.
Keywords fast demand response, smart grid, virtual sensor