Substation harmonic wave state estimation method based on integrated monitoring device

The invention relates to a substation harmonic wave state estimation method based on an integrated monitoring device. The method comprises the steps that elements in a node voltage phasor and elements in an injection current phasor are classified according to quantity measurement and state quantity, and are sequenced firstly according to the measurement quantity and then according to the state quantity, then, a node admittance matrix is correspondingly partitioned into blocks, and conversion is carried out to obtain a measuring equation. As for a network topology structure with a known current measuring point number and a known voltage measuring point number, node numbers are combined to write partitioned matrixes of the admittance matrix, and the portioned matrixes are substituted into the measuring equation to calculate the state quantity. The substation harmonic wave state estimation method based on the integrated monitoring device is high in estimation accuracy, easy to implement and low in implementation cost.