Frequency control method of isolated grid with high permeability wind power based on polysilicon load

Abstract

The invention belongs to the technical field of power system operation and control, and especially relates to a high-permeability wind power isolation grid frequency control method based on a polycrystalline silicon load. The method comprises the steps: carrying out the analysis of the growing process of polycrystalline silicon, building an electrical model of the polycrystalline silicon load, carrying out the fitting of voltage and current and the radius of a polycrystalline silicon rod through combining with the industrial data, and building a polycrystalline silicon load power characteristic model; obtaining a polycrystalline silicon load power control mathematic model according to the polycrystalline silicon load power characteristic model. The method can achieve the quick changing of the consumption power of the polycrystalline silicon load through changing a wave splicing voltage and wave splicing time under the condition of giving consideration to two limiting factors: incoming rate of cooling water and the temperature of the silicon rod. The method proposes a control strategy for the response of the polycrystalline silicon load to the fluctuation of the isolated grid power under the condition of giving consideration to the diversity of the polycrystalline silicon loads. The method takes a Chifeng isolated grid as the background, enables the isolated grid to maintain stable through load response power under the condition of extreme wind power fluctuation, and verifies the correctness of the proposed control strategy.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a frequency control method for an isolated power grid containing high-permeability wind power based on polysilicon loads. Background technique [0002] As a raw material for photovoltaic new energy technology, electronic technology and information industry, polysilicon is in increasing demand, which is directly related to the development of energy and information fields. Many countries in the world have listed it as a strategic material, while "high energy consumption" Problems have been restricting the development of the industry. Increasing polysilicon production capacity and reducing production costs are the inevitable choices for enterprises to survive. The comprehensive power consumption in the production process of the polysilicon manufacturing industry is 120-170kWh / kg, and the reduction power consumption accounts for as high as 50%-6...

AI Technical Summary

Problems solved by technology

[0003] For grids with large-scale access to wind power, the randomness and volatility of wind power are always the key issues for the safe and stable operation of the system. In order to realize the safe consumption of renewable energy in isolated grids with high energy consumption loads, demand response technology can be used from On the load side, load reduction is used to achieve power balance, that is, the polysilicon load is regulated to respond to power fluctuations in the power system. At present, most of the research on reduction furnaces focuses on the physical process of production, but not the electrical model and power control of polysilicon load.

In addition, the resistance of polysilicon rods in the production process has the characteristics of time-varying, nonlinear, and many controlled factors, so it is difficult to define the resistance value of polysilicon rods

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