Primary frequency modulation optimization method in sequence valve control mode

Abstract

The invention discloses a primary frequency modulation optimization method in a sequence valve control mode, comprising a primary frequency modulation control loop which performs primary compensationon a valve nonlinear region compensation coefficient. A secondary compensation control loop is added to the primary frequency modulation control loop. A relatively low nonlinear region primary compensation coefficient of a valve total flow instruction is set in an existing primary frequency modulation control loop, thereby avoiding the overshoot of a large-frequency-difference primary frequency modulation fast loop. A relatively large nonlinear region compensation coefficient of the valve total flow instruction is set in the secondary compensation control loop. Thus, an effective secondary compensation coefficient can be provided when the valve total flow instruction is still in the nonlinear region after the existing primary frequency modulation control loop performs the first valve nonlinear region compensation, such that the valve total flow instruction gets away from the nonlinear region, thereby ensuring that the valve total flow instruction can quickly gets away from the nonlinear region, and enhancing the fast response capability of the primary frequency modulation.

Description

technical field [0001] The invention relates to a frequency modulation optimization method, in particular to a primary frequency modulation optimization method in a sequential valve control mode. Background technique [0002] According to the requirements of the "Power Grid Operation Guidelines", all grid-connected units must have the function of primary frequency regulation. The main assessment technical indicators of primary frequency regulation include speed unequal rate, frequency regulation dead zone, dynamic indicators, primary frequency regulation load change range, etc. Among them, the dynamic index requires the primary frequency modulation function to have quick response capability, which is the key assessment index. In the sequential valve control mode, whether the flow characteristic of the valve combination is linear is an important reason that affects the speed of a quick response. When the valve combination is in the non-linear region, the local uneven rate of...

AI Technical Summary

Problems solved by technology

When the valve combination is in the non-linear region, the local uneven rate of the unit is too large, and it cannot respond quickly to the change of frequency modulation load

However, due to the manufacturing process, valve structure and maintenance, etc., in the sequential valve control mode, the nonlinear region of the valve combination cannot be avoided.

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