Hydraulic turbine governor parameter tuning method based on state space analysis and system

Abstract

The invention discloses a hydraulic turbine governor parameter tuning method based on state space analysis and system. The method comprises steps: the frequency response coefficient of an asynchronousinterconnection transmitting end system load is calculated; a hydraulic turbine system open-loop transfer function is built, and a corresponding step responding function is solved; according to the calculated frequency response coefficient, state space equations for the hydraulic turbine under asynchronous interconnection and the speed regulation closed loop system are built, and the maximum eigenvalue of the real part of the built state space equations and the corresponding damping ratio are solved; according to the solved step responding function, the built state space equations and the damping ratio corresponding to the maximum eigenvalue of the real part of the state space equations, a penalty function method is adopted to build a particle swarm fitness function; and according to theparticle swarm fitness function, with the optimization of primary frequency modulation action characteristics of a hydroelectric generating unit under step response as a goal, and a particle swarm optimization algorithm is used to solve the optimal parameters of the hydraulic turbine governor. The robustness is strong, the primary frequency modulation performance is good, and the method and the system can be widely applied to the power system field.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method and system for parameter setting of a water turbine governor based on state space analysis. Background technique [0002] In the asynchronous networked high hydropower ratio sending end system, the water hammer effect of the turbine may cause the governor to be unstable. Due to the small load frequency regulation effect coefficient, the system damping is low, which in turn causes ultra-low frequency oscillation. The negative damping characteristic of the hydroelectric unit is the main cause of the low frequency oscillation. Generally speaking, the water turbine and governor will produce negative damping in the low frequency band, and the phase lag of the steam turbine itself is small. When the phase lag of the governor is also small, positive damping will be produced in the low frequency band. These are all related to the parameter setting of the turbine governor. [0003]...

AI Technical Summary

Problems solved by technology

The asynchronous test and simulation report of Yunnan Power Grid also prove that if the synchronous networking parameters are still used, ultra-low frequency oscillations will occur in Yunnan Power Grid; and a large reduction in parameters will lead to a too slow primary frequency regulation rate of hydropower units

[0004] At present, when dealing with the low-frequency oscillation caused by the negative damping characteristics of the turbine governor, the general solution is to set the dead zone of the primary frequency modulation of the generator to be greater than the dead zone of the DC frequency limiter (Frequency Limit Controller, FLC), but this method does not Not suitable for asynchronous networked sender systems

Images