Study On Interaction Of Connecting Nuclear Power Units To Power Grids

Today's trend of deteriorating world environment led to the urgent needs of clean energy, nuclear power generation as a pollution-free energy has been developed vigorously in the world. With the advent of the energy crisis and increasing awareness of environmental protection,a large number of nuclear power units connected to the power grid, the proportion of nuclear power in the grid increases,however the capacity of Taishan nuclear power units is the largest in the world, its capacity is 1755 MW, Which makes the studies on nuclear power plant operating characteristics of critical importance in safe and stable operation of power grid.The Power grid malfunction or disturbance may lead to instability of the terminal voltage of nuclear power units and grid frequency,which may cause the fluctuations in intrinsic parameters of nuclear power generating sets. Also the withdrawal of nuclear Power units will cause the system to lose substantive active Power making the malfunction even worse.In order to investigate the interaction between nuclear power units and power grid under serious disturbance, the paper study the mathematical model and simulation model of Taishan nuclear power units.The characteristics of pressurized water reactor plant are simulated in fault modes.Simulative results show that.it is not necessary to take special measures for normal faults which are removed rapidly and correctly:special measures have to be taken if the fault stays because of the incorrect protection operations,which may cause unit synchronization loss.