Broadband Measurement Scheme Based on Positive Sequence Instantaneous Power Algorithm

Modern power system shows the characteristics of high proportion of renewable energy and power electronic equipment (referred to as “double high”). Affected by the “double high” characteristics, in addition to power frequency signals, large amount of harmonic and interharmonic signals exist in the system. Resulting in the effect of broadband oscillation by the interaction between those signals of different frequencies and power frequency in the system, which may severely threaten the safe and stable operation of power system. At the current stage, the occurrence of broadband oscillation is mainly determined by measurement of the three-phase instantaneous power. However, the result might be confusing when three-phase imbalance occurs in the system. To solve this, the paper provides a broadband measurement method based on the algorithm of positive sequence instantaneous power, which significantly increases the accuracy of the measurement. This feasibility of the proposed method is verified by implementation results presented in the paper.