A thermal power generating unit primary frequency modulation performance assessment index calculation method and system

Abstract

The invention discloses a thermal power generating unit primary frequency modulation performance assessment index calculation method and system. The method comprises the following steps: calculating an additional weight coefficient of an integral electric quantity according to related electric quantity information of the system; According to the additional weight coefficient, calculating the integral electric quantity of the primary frequency modulation actual increase output of the primary frequency modulation unit and the integral electric quantity of the primary frequency modulation theoretical increase output; And calculating a primary frequency modulation performance assessment index value of the set based on the integral electric quantity of the primary frequency modulation actual increase output and the integral electric quantity of the primary frequency modulation theory increase output. According to the method, the primary frequency modulation performance of the thermal powergenerating unit is examined after power disturbance fault disturbance of the system, a grid-connected power plant can be stimulated to improve the primary frequency modulation capability of the unit,rapid change of frequency is inhibited, and rapid recovery of supporting frequency is supported.

Description

technical field [0001] The invention relates to a thermal power unit primary frequency modulation performance evaluation index calculation method and system based on an improved integral power algorithm, and belongs to the technical field of electric power systems and automation thereof. Background technique [0002] With the rapid development of the national economy, the demand for active power loads in various regions continues to increase, and ensuring the balance between supply and demand of electric energy is an important condition for frequency stability. At the same time, with the continuous development of my country's cross-regional interconnected power grid, large-capacity long-distance power transmission has become an important feature of my country's power grid. With the continuous increase of the transmission capacity of single-circuit transmission lines, the risk of accidents caused by large frequency fluctuations in the system continues to increase, which makes...

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Problems solved by technology

Under the door adjustment signal, the governor of the thermal power unit adjusts the actual output of the thermal power unit by changing the size of the valve opening. However, because the steam turbine needs a certain delay to release heat storage, the actual output of the unit cannot immediately follow the adjustment door instruction. As a result, the theoretical power of primary frequency modulation of the unit obtained by the calculation method of integral power currently adopted is much larger than the actual operating power of the unit, and the result obtained by using the ratio of the two as the primary frequency modulation effect index is generally small, and it is used as an index for performance assessment. Little reference value

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