Frequency modulation method for hydraulic power plant

Abstract

The invention discloses a frequency modulation method for a hydraulic power plant. The frequency modulation method comprises the following steps: step 1, a first sensor is arranged on a main shaft or certain equipment synchronously rotating along with the main shaft; the first sensor can measure a rotor winding rotating speed Vg when the unit is running; step 2, the unit frequency Fg when the unit is running is calculated; step 3, a frequency modulation actuating quantity delta p is calculated according to a frequency dead zone fs and a power permanent difference coefficient Ep; whether the absolute value of the delta p is less than a threshold value or not is judged; if the absolute value of the delta p is less than the threshold value, the frequency modulation is stopped; and if the absolute value of the delta p is greater than the threshold value, a step 4 is executed; and step 4, the guide vane opening is adjusted according to the frequency modulation actuating quantity delta p to enable the absolute value of the delta p to be reduced and to execute the step 1. According to the frequency modulation method, when a speed controller works in a power mode, the primary frequency modulation actuating quantity of the hydraulic power plant is converted into the power adjusting quantity for modulation, so that the primary frequency modulation performance of the hydraulic power plant is improved, and the check requirements of the power grid on the primary frequency modulation target value are satisfied.

Description

technical field [0001] The invention relates to the technical field of synchronous grid connection, in particular to a frequency modulation adjustment method of a hydropower plant. Background technique [0002] The evaluation target value of the power grid for a frequency modulation is active power, but most turbine governors currently use the opening of the guide vane as the adjustment target value. The governor works in the opening mode. The difference is converted into the guide vane opening, and the guide vane opening is used as the target value for adjustment. Since there is nonlinearity between the guide vane opening and active power, and under different water heads, the change value of the active power corresponding to the same guide vane opening is also Different, so the primary frequency adjustment performance of the governor working in the opening mode is often difficult to meet the grid assessment requirements. Contents of the invention [0003] The present inv...

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Problems solved by technology

[0002] The evaluation target value of the power grid for a frequency regulation is active power, but most turbine governors currently use the opening of the guide vane as the adjustment target value. The governor works in the opening mode. The difference is converted into the guide vane opening, and the guide vane opening is used as the target value for adjustment. Since there is nonlinearity between the guide vane opening and active power, and under different water heads, the change value of the active power corresponding to the same guide vane opening is also Different, so the primary frequency regulation performance of the governor working in the opening mode is often difficult to meet the grid assessment requirements

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