An Optimal Method of Primary Frequency Modulation under Sequential Valve Control Mode

Abstract

The invention discloses a primary frequency modulation optimization method under a sequential valve control mode, which includes a primary frequency modulation control loop, and the primary frequency modulation control loop performs primary compensation to the compensation coefficient of the non-linear region of the valve, and the primary frequency modulation control loop adds The secondary compensation control loop; the primary compensation coefficient setting of the nonlinear zone of the valve total flow command in the existing primary frequency modulation control loop is relatively small, which avoids the overshoot of the large frequency difference primary frequency modulation fast loop; the valve total flow rate in the secondary compensation control loop If the compensation coefficient of the nonlinear zone of the flow command is set relatively large, when the existing primary frequency modulation control loop performs the first valve nonlinear zone compensation, the valve’s total flow command is still in the nonlinear zone, and effective secondary compensation can be provided. coefficient, so that the total flow command of the valve is out of the non-linear region; thereby ensuring that the total flow command of the valve can quickly break away from the non-linear region, and enhancing the rapid 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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