Tuning method for governor control parameters of hydropower generator in isolated grid considering primary frequency performance and small-signal stability

摘要

This paper presents a method of tuning governor control parameters of an isolated hydropower generator considering the primary frequency performance and small-signal stability.First,generators that can be operated in isolated state are identified.Second,different schemes are proposed for generator mode switching from on-grid to off-grid state through comparison and mechanism analysis.Third,the time domain model and frequency domain model of the isolated generator governor are constructed to respectively estimate the primary frequency performance and small signal stability.Parameter sets that satisfy the pdmary frequency performance and small signal stability are acquired as optimal values of govemor control parameters.Finally,the measurement-based parameters of the governor are identified and validated using simulations to demonstrate the feasibility and effectiveness of the method.