The wide-area synchronous measurement system based on synchronized phasor measurement unit (PMU) offers significant advantages in smart grid monitoring. Optimizing PMU placement is crucial to ensure system-wide observability and economic efficiency. A PMU optimization configuration method based on node and line importance is proposed. Firstly

considering PMU configuration costs

an economic objective function is established. Secondly

in order to deal with system faults

PMU configuration with adequate redundancy are designed. And then

based on the power system topology

a scoring model for node and line importance along with redundancy is developed to establish a comprehensive scoring objective function. Finally

in order to overcome the drawbacks like local optima and slow convergence in traditional heuristic algorithms

an improved dung beetle optimization algorithm is proposed. This algorithm is applied to solve the optimal PMU configurations in IEEE-14

IEEE-30 and IEEE-69 node systems

which validates the feasibility and effectiveness of the proposed model and algorithm.