Dynamic power system load frequency coordination method based on frequency division control

A power system and frequency coordination technology, applied in wind power generation, circuit devices, AC network circuits, etc., can solve the problems affecting the system frequency deviation, increase frequency deviation, and deteriorate the operating state of the power system, so as to reduce the system frequency deviation amplitude. effect of value

Active Publication Date: 2019-04-19
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, renewable energy is random and uncertain, leading to increased frequency deviation and deteriorating the operating state of the power system
At the same time, the random fluctuation of load demand and the time delay of the open communication network structure will also affect the system frequency deviation

Method used

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  • Dynamic power system load frequency coordination method based on frequency division control
  • Dynamic power system load frequency coordination method based on frequency division control
  • Dynamic power system load frequency coordination method based on frequency division control

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Embodiment

[0062] against figure 1 In the dynamic time-delay power system shown, in order to make the doubly-fed wind power generating set auxiliary thermal power generating set participate in frequency management, the present invention proposes a dynamic power system load frequency coordination method based on frequency division control, which includes the following steps:

[0063] 1. Construct a dynamic time-delay power system including doubly-fed wind turbines and thermal generators.

[0064] 1) Wind turbine model

[0065] The mechanical output power of the wind turbine is expressed as:

[0066]

[0067] Where: Δv w is the change in wind speed, ρ is the air density, A r is the area swept by the blade, ΔC p (Δλ, Δβ) is the wind energy utilization coefficient, Δβ is the pitch angle of the wind blade, Δλ=A r Δω / Δv w is the tip speed ratio, and the wind turbine rotor angular velocity Δω is expressed as:

[0068]

[0069] In the formula: J is the moment of inertia of the wind ...

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Abstract

The invention relates to a dynamic power system load frequency coordination method based on frequency division control. The dynamic power system load frequency coordination method comprises the stepsof: 1) constructing a dynamic power system model considering communication time lag and comprising a doubly-fed wind power generation system and a thermal power generation system; 2) applying hybrid deviation to frequency management of the doubly-fed wind power generation system and the thermal power generation system by means of a frequency divider; 3) for a thermal power generator set, designingdouble-loop compensation control based on a low-frequency component of the hybrid deviation, so as to improve robustness and dynamic response of load frequency control; 4) and for a doubly-fed wind turbine generator set, designing a proportional-integral controller based on a high-frequency component of the hybrid deviation so as to support frequency adjustment of the thermal power generator set,and optimizing a multi-objective function by utilizing a particle swarm optimization algorithm to obtain PI controller parameters. Compared with the prior art, the dynamic power system load frequencycoordination method has the advantages that the system robustness is high, the doubly-fed wind power generation system can assist in system frequency management, the load frequency deviation is smaller, the recovery speed is faster and the like.

Description

technical field [0001] The invention relates to a load frequency coordination method of a dynamic power system, in particular to a load frequency coordination method of a dynamic power system based on frequency division control. Background technique [0002] As a sustainable and clean energy, renewable energy plays an active role in solving the shortage of fossil energy and mitigating global warming. However, renewable energy is random and uncertain, leading to increased frequency deviation and deteriorating the operating state of the power system. At the same time, the random fluctuation of load demand and the time delay of the open communication network structure will also affect the system frequency deviation. Therefore, frequency regulation in power systems has attracted much attention in recent years, and it is necessary to design an effective load frequency control (LFC) method for time-delayed power systems with uncertain wind energy and random load demands. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20Y02E10/76
Inventor 米阳何星瑭韩云昊宋元元蔡杭谊陈鑫喻思郎中杰季亮杨兴武
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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