Development and application of broadband monitoring systems in power grids

With the large-scale integration of distributed new energy sources into power grids and the wide application of power electronics， the power grid’s risk of oscillation has reached epidemic proportions and is resolving into broadband domain oscillation. Given the lack of effective means to monitor the broadband domain characteristics of the power grid on the dispatching side， a grid-oriented broadband monitoring system is developed. First， the hardware and software architectures of the system are introduced， and a broadband monitoring model is designed based on two mainstream extended versions of harmonic communication specifications. Then， a unified broadband data acquisition architecture and a unified broadband data service technology are proposed. Functional modules such as harmonic/interharmonic overrun alarm， historic broadband data query， and broadband oscillation alarm forwarding are developed to realize distributed acquisition， centralized monitoring， and analysis of high-capacity and high-rate broadband signals. Finally， it is shown through engineering practice that the broadband monitoring system provides powerful data support for dynamic monitoring， risk identification， prevention， and control in the more broadband domains in power grids.