A control method for central air-conditioning load response hvdc blocking accident

Abstract

The invention discloses a control method of a central air conditioning load response to HVDC locking accident. The control method comprises the following steps that measuring information of an air conditioner is collected in real time, the information comprises setting cooling water entering and exiting temperature, cooling water entering and exiting temperature and central air conditioner main unit power and the like; when the HVDC locking accident occurs, a safe and stable load shedding main station issues load shedding instructions through a communication protocol; a load substation executes the load shedding instructions, the load substation excises the controlled central air conditioning load by the communication protocol; feeder power supply is restored, and the current percentage ofthe air conditioner is controlled to be the same as that before the accident; limitation on the percentage of air conditioning current is lifted; a full time domain simulation model is established; and a dispatching center grasps changes of the system frequency after the load is added to the control through the full time domain simulation model. The control method can quickly respond to the HVDClocking accident. Impact on the central air conditioner is little. Secondary power shocks to the system are avoided. The power grid dispatching center mastering the frequency response after the accident is facilitated.

Description

technical field [0001] The invention relates to a control method for a central air-conditioning load response to a blocking accident of an HVDC transmission line. Background technique [0002] In order to solve the current urgent environmental and energy problems, renewable energy sources such as wind and light are being developed and utilized on a large scale around the world. China has also formulated an energy strategy of "Global Energy Internet" for this purpose. In China, a large number of renewable energy resources are concentrated in the northwest region, while large load centers are distributed in the southeast region. In order to accept more renewable energy, more and more ultra-high voltage direct current (HVDC) transmission projects at home and abroad have been completed or are under construction. China currently has Ningdong-Zhejiang, Northwest Yunnan-Guangdong, Shanxi-Jiangsu, etc. For HVDC lines abroad, there are Northeast India-Agra three-terminal HVDC lines,...

AI Technical Summary

Problems solved by technology

[0005] 1) The central air-conditioning load modeling in response to HVDC lockout accidents is immature

[0006] 2) At present, the direct removal of the central air conditioner does not consider the user comfort, and the power shock after the power supply is restored may bring new hazards to the system

[0007] 3) Failure to establish a frequency response model after controlling the central air-conditioning load, so that the power grid dispatching center can accurately understand the effect of load response

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