Multi-load characteristic-matched under-frequency load shedding optimal control system and multi-load characteristic-matched under-frequency load shedding optimal control method

Abstract

The invention relates to the field of power system frequency control, in particular to a multi-load characteristic-matched under-frequency load shedding optimal control system and a multi-load characteristic-matched under-frequency load shedding optimal control method, which are used in an under-frequency control method that is adopted to guarantee the safe, economical and stable operation of a power grid when an under-frequency fault as the result of the power loss and sudden load proportion increase of the power grid takes place. Generating units are connected with power bus nodes, the power bus nodes are connected with transformer station bus nodes through transformer units, the transformer station bus nodes are connected with load units with different characteristics through power transmission lines, and are also connected with other transformer station bus nodes through power transmission lines, and control units are connected with the transformer station bus nodes and the load units with different characteristics. Besides accident grade-based limitation, the invention can carry out safe and stable operation and realize economical and reasonable operation. With the minimum economical cost as the purpose of under-frequency load shedding control, the invention greatly reduces the economic loss of the frequency control process, and therefore the economic benefit is enormous.

Description

Technical field [0001] The present invention relates to the field of power system frequency control, in particular to a low-frequency load shedding optimization control system and method with multi-load characteristic matching, which is used for low-frequency faults caused by power loss and sudden increase in load ratio in the power grid, in order to ensure the safety of the power grid, Low frequency control method adopted for economical and stable operation. Background technique [0002] With the continuous development of the market economy, the load on the demand side of the power system is increasing day by day, and the load categories are more diverse. Therefore, in order to ensure the maximum economic benefits of the market, the overall frequency regulation capacity of the power grid has become the main core issue that has attracted much attention. When a low-frequency fault occurs in the power grid, the system will be divided into three frequency regulation levels base...

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Problems solved by technology

[0003] At present, the low-frequency load shedding method is mainly based on technical objectives such as the control sequence and the frequency modulation characteristics of the load itself to complete the low-frequency load shedding control.

In order to adapt to the development of market economy, the economic benefit of the low-frequency load shedding method has become the main concern of the power grid company. Therefore, it appears that the fault level standard is used to constrain the load shedding capacity. However, the size of the load shedding capacity is proportional to the frequency recovery characteristics. , so there is a contradiction between the fault level and the frequency recovery characteristics

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