Impact of Typical Weather Circulation Situation on Relationship Between Power Supply and Demand of Xiluodu Hydropower Station
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Abstract:
Based on the daily inbound and outbound flow and output data of Xiluodu Hydropower Station, the daily electricity load data of Guangdong, and the daily re-analysis data of NCEP from 2015 to 2017, this paper divides the production scenarios of Xiluodu Right Bank Hydropower Station into three types: short supply, oversupply and atypical oversupply. They are characterized by insufficient water in the dry season, severe water abandonment in flood season, and contradiction between power generation and power demand of Guangdong Province. Typical cases are selected to analyze the circulation situation and weather causes corresponding to different types, and suggestions for future dispatching of Xiluodu Hydropower Station are put forward. The results show that in May and June of each year, Guangdong is often controlled by subtropical high pressure, and the demand for electricity increases significantly. The drainage area above Yinbin is mainly located on the northwest side of the anticyclonic circulation and is controlled by a uniform westward or southwestern warm and humid air. There is no cold air activity, which is not conducive to large-scale precipitation. As a result, the power generation capacity of Xiluodu Hydropower Station is insufficient and the demand for electricity in Guangdong exceeds supply. The drainage area above Yinbin is mostly affected by plateau troughs and shear lines or cold air from the east from July to September, conducive to significant precipitation. During this period, the power station has full capacity. However, when Guangdong is affected by the typhoon system or is located on the north side of the subtropical high pressure, the power demand in Guangdong decreases, resulting in an over-supply type. If Guangdong is under the control of subtropical high voltage, the electricity demand is high. However, water abandonment on the right bank of Xiluodu happens frequently due to the increased output of other hydropower stations in the southwestern region and limited power transmission, which has led to a decreased demand for power from the power grid on the right bank of Xiluodu. This situation corresponds to atypical oversupply. In actual power generation productions, it is possible to study and judge in advance according to weather circulation situation and better carry out reservoir dispatching, optimize power station operation, and increase the effective consumption of hydroelectric power and full utilization of hydropower resources during flood periods.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.