Electric water heater load group dynamic system and control model thereof

A technology for electric water heaters and control models, which is applied to fluid heaters, lighting and heating equipment, etc. It can solve problems such as inability to respond to wind power fluctuations, optimal operation control strategies for electric water heaters to be studied, and lack of optimization in temperature control methods.

Inactive Publication Date: 2019-05-17
北京华建网源电力设计研究院有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing temperature control methods of electric water heaters lack optimization, and cannot respond to wind power fluctuations to achieve effective consumption of wind power. Therefore, the optimal operation control strategy of electric water heaters needs to be studied

Method used

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  • Electric water heater load group dynamic system and control model thereof
  • Electric water heater load group dynamic system and control model thereof
  • Electric water heater load group dynamic system and control model thereof

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Embodiment Construction

[0110] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0111] A load group dynamic system for electric water heaters, taking electric water heaters as the research object, assuming that the water storage of the water heater is constant, the amount of cold water injection is equal to the consumption of hot water, when the electric water heater is turned on, the water temperature rises, and when the electric water heater is turned off, the water temperature drops, including the following mathematical model,

[0112] The thermodynamic equation used to express the heating process of electric water heater and the heat exchange process with air:

[0113]

[0114] The dynamic equation of electric water heater group:

[0115...

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Abstract

The invention belongs to the field of power system power distribution network control, and particularly relates to an electric water heater load group dynamic system and a control model thereof. A linear state equation constructed in the invention is suitable for modeling of various electric water heaters, the load group of the electric water heater is controlled in real time by using a sliding mode control strategy, and the design of a control rate is related to the number of the electric water heater groups, the use condition of hot water and the like, and has relatively strong robustness for eliminating wind power, a corresponding mathematical model is established according to the physical characteristics of the electric water heater groups by using a linear differential equation, a temperature value is set by adopting a discrete sliding mode, and the load of the electric water heater groups is controlled so as to achieve the goal of eliminating the wind power.

Description

technical field [0001] The invention belongs to the field of electric power system distribution network control, and in particular relates to a dynamic system and control model of an electric water heater load group. Background technique [0002] With the gradual increase of environmental pressure and the continuous decline of wind power construction costs, the upsurge of wind power construction and grid connection has been rising. At present, the total installed capacity of wind power in my country has surpassed that of the United States, ranking first in the world. However, the output power of wind power generation has natural strong randomness and high prediction uncertainty. In the first half of 2018, the national abandoned wind power reached 18.2 billion kWh. Improving the level of wind power consumption and reducing the curtailed wind power will greatly improve the operation economy of the power system. The only way to gain and reduce environmental benefits. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24H9/20
Inventor 王新雷宋崇明田雪沁徐彤刘瀚涛谢俊
Owner 北京华建网源电力设计研究院有限公司
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