With large scale access electric power substitution products represented by electric kilns to the grid

such a series of power quality problems as excessive harmonic content in the distribution grid needs solving.In this paper

the working principle of the electric kiln system is described firstly in accordance with the actual investigation results.The difference of harmonic emission characteristic of them is obtained by comparing theoretical analysis result and actual measurement data and the reason of the difference is explored from the point of view of network-load interaction together with combination with simulation model.The influence of such three aspects as ideal condition

background harmonics and three-phase unbalance of system are studied on the basis of above model.Finally

the harmonic emission characteristic of electric kiln under influence of network-load is summarized

which has definite reference significance for the deep study of electric power substitution products.