Hydro-generator active power cooperative control method based on power grid frequency

Abstract

The invention discloses a hydro-generator active power cooperative control method based on power grid frequency, relates to the technical field of power system automation, and effectively solves the problem that primary frequency modulation and AGC are not coordinated through the design of a primary frequency modulation function and AGC cooperative control logic, and improves the active power control accuracy of a water turbine. The primary frequency modulation power regulation quantity is uploaded to the monitoring system and superposed to the active closed-loop power given set value by adopting a mode of superposing the primary frequency modulation power regulation quantity with AGC, so that the condition that the primary frequency modulation action quantity is counteracted by the active closed loop of the monitoring system is avoided. A primary frequency modulation action / reset signal is used as a judgment condition for effective cooperative control of the active power of the water turbine, and targeted primary frequency modulation and AGC cooperative control logic is executed under different working conditions of steady state and dynamic state of the power of the water turbine unit. In other words, when the unit is in a stable state, the primary frequency modulation action of the speed regulator is prior to AGC control; when the unit is dynamically adjusted, the primary frequency modulation action quantity of the speed regulator and the AGC are subjected to superposition control.

Description

technical field [0001] The invention relates to the technical field of electric power system automation, in particular to a method for synergistically controlling the active power of hydroelectric generators based on grid frequency. Background technique [0002] The grid frequency is one of the important indicators to measure the power quality. As the power system load changes, the grid frequency changes accordingly, and it is in a dynamic operation process. In order to ensure that the system frequency fluctuates within a certain range and does not affect the stable operation of the system, frequency adjustment is required. Frequency modulation is divided into primary frequency modulation and secondary frequency modulation (controlled by the automatic generation control system AGC). The primary frequency modulation is configured in the governor control system. When it is detected that the system frequency exceeds the dead zone, it will immediately participate in the adjustme...

AI Technical Summary

Problems solved by technology

When the two functions of primary frequency regulation and AGC are put into use at the same time, there will be adjustment conflicts and uncoordinated situations, that is, the frequency of the grid fluctuates. Or issue a reverse-adjusted power given value, the action effect of the primary frequency modulation will conflict with the active closed-loop adjustment of the AGC, causing the primary frequency modulation adjustment to be offset by the AGC reverse adjustment, and the contribution rate of the primary frequency modulation cannot be reflected. Grid assessment

The effect of a frequency regulation operation cannot be objectively reflected, which affects the assessment indicators of the hydropower station and is not conducive to the stable operation of the power grid

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