A Method of Load Frequency Control Based on Fault Tolerance in Multi-area Interconnected Power System

A load frequency control and power system technology, applied in the direction of circuit devices, AC network circuits, reducing/preventing power oscillation, etc., can solve problems such as difficult to accurately distinguish the shape of the fault

Inactive Publication Date: 2019-07-30
CHONGQING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The only remaining methods are mainly based on the residual method, but this kind of fault estimation can only obtain the approximate value of the fault amplitude, and it is difficult to accurately distinguish the "shape" of the fault
Therefore, how to reconstruct faults with greater precision is very important for controller design, and it is also very challenging.

Method used

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  • A Method of Load Frequency Control Based on Fault Tolerance in Multi-area Interconnected Power System
  • A Method of Load Frequency Control Based on Fault Tolerance in Multi-area Interconnected Power System
  • A Method of Load Frequency Control Based on Fault Tolerance in Multi-area Interconnected Power System

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0063] The method for load frequency control based on fault tolerance in a multi-area interconnected power system in this embodiment is characterized in that it includes the following steps:

[0064] 1. Establish a mathematical model for load frequency control of multi-area interconnected power systems;

[0065] The dynamic model of multi-area interconnected power system is:

[0066]

[0067] in:

[0068]

[0069]

[0070] in addition, is the state variable, is x i Adjacent state variables of (t), is the control input, is the measured output, is the unknown sensor fault, ΔP di (t)∈R n is the load disturbance, Δf i is the frequency deviation in Hz, ΔP tie-i is the tie line power deviation, the unit is pu, ΔP mi is the generator output power deviation, the unit is pu, ΔP gi is the position deviation of the regulating valve, the ...

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Abstract

The invention discloses a fault tolerance-based load frequency control method for a multi-region interconnected power system. The method comprises the following steps that: (1) a multi-energy power system load frequency control mathematical model is established; (2) the stability condition of multi-region interconnected power system fault tolerance-based load frequency control is obtained on the basis of a sliding mode observer; and (3) a fault-tolerant controller is designed, so that load frequency control can be realized. According to the fault tolerance-based load frequency control method for the multi-region interconnected power system of the invention, the designed sliding mode observer can realize the estimation and reconstruction of the fault of a sensor and the state of the system, and the designed fault tolerance controller can ensure that the state of the system tends to be stable gradually; and fault-tolerant control is realized through the reconstruction of fault signals, and therefore, the reliability of the interconnected power system can be further improved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a control method for multi-regional load frequencies. Background technique [0002] With the development of modern power grids in the direction of long-distance, ultra-high voltage, and even ultra-high voltage, the scale of the power grid becomes larger, and the structure and operation mode become more complex, which makes the safe and stable operation of the power system face constant challenges. According to the variation range of system power generation and load unbalance and the fluctuation time scale, the adjustment of power system frequency and active power can usually be divided into three categories: primary frequency regulation, secondary frequency regulation and tertiary frequency regulation. The coordinated work among tertiary frequency modulation and low frequency load shedding constitutes a complete frequency control system for large-scale and complex power sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 苏晓杰刘鑫鑫夏凤琴文瑶
Owner CHONGQING UNIV
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