To study the correlation between cooling load and air temperature, this paper uses the maximum load comparison method to calculate the cooling load based on the actual load data of the power grid, and uses the temperature correction model to correct the daily maximum temperature, and then establishes a high-order regression model of cooling load and corrected air temperature. The method is applied to the sensitivity analysis of cooling load and air temperature in the Chongqing power grid and sub-regions, and the corresponding change law is obtained, which provides an important reference basis for the production and dispatch, optimal operation, and marketing of the power grid.
Combining the renewable energy system, the Energy Storage (ES) station can maintain stable power transfer between renewable energy systems and power grid. This paper works on real-time simulation for multiple energy storage systems under different operating modes. Then taking a large number of ES converters and power grid into account, a modified electromagnetic transient program (EMTP) algorithm is proposed which is fit for the field-programmable gate array (FPGA)-based real-time simulation. By compressing the steps of the traditional EMTP algorithm, the simulation can be completed only by updating the history current source in each simulation cycle. In the meantime, the system is decoupled and multiple subsystems are simulated independently. Furthermore, to fully utilize the high parallelism of FPGA, we design and build a CPU-FPGA-based real-time simulation platform to implement the ES station. Using the simulation platform, we build a model of ES station and connect to the grid through an inverter. The whole system is tested in a single FPGA under different scenarios.
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