Doubly-fed fan control parameter optimization method and system based on energy stability domain

A technology for controlling parameters and doubly-fed wind turbines, applied in the control system, generator control circuit, control generator, etc., to achieve the effect of improving grid connection capability and improving power angle stability

Active Publication Date: 2019-10-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Application Information

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a control parameter optimization method and system for double-fed wind turbines based on the energy stability domain, so as to solve the problem of stable operation of wind power grid-connected systems at the present stage

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  • Doubly-fed fan control parameter optimization method and system based on energy stability domain
  • Doubly-fed fan control parameter optimization method and system based on energy stability domain
  • Doubly-fed fan control parameter optimization method and system based on energy stability domain

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Embodiment 1

[0053] This embodiment discloses a method for optimizing the control parameters of double-fed wind turbines based on the energy stability domain, such as figure 1 shown, including the following steps:

[0054] Step 1. Establish the energy stability domain of the wind power grid-connected system and determine the stability boundary;

[0055] Step 2. After the disturbance occurs for a period of time, calculate the energy distance from the current operating point to the boundary of the energy stability domain, and construct the energy distance stability condition of the system after the disturbance; the energy distance is the energy distance from the current operating point to the stable boundary along the disturbance direction distance;

[0056] Step 3. With the goal of energy distance stability, the objective function constraints are established, and the improved plant simulation growth algorithm is used to obtain and output the key control parameters of the optimized double-f...

Embodiment 2

[0093] This embodiment discloses a doubly-fed fan control parameter optimization system based on the energy stability domain, such as Figure 5 as shown,

[0094] It includes an energy stability domain establishment module, an energy distance calculation module, a control parameter optimization module and a result output module.

[0095] The energy stability domain establishment module is used to establish the energy stability domain of the wind power grid-connected system according to the collected data of the wind power grid-connected system, and determine the boundary of the energy stability domain;

[0096] The collected wind power grid-connected system data includes wind power grid-connected system synchronous generators, double-fed wind turbines, network line parameters and load data, node operation data during system oscillation, and energy stability region boundary data determined by node injection disturbance power.

[0097] The energy distance calculation module is ...

Embodiment 3

[0101] by Image 6 Taking the improved IEEE 4-machine 11-node system as an example, the key control parameters of double-fed wind turbines: K P_PLL = 1 p.u.,K ω = 1 p.u.,T ω = 0.1 p.u.;

[0102] For this system, the stability margin H 0 (P 0 ,E 0 ) is set to 0.1MW*s; The set value needs to ensure that the adjustment of the control parameters is within a certain range: K P_PLL >0.1p.u.,K ω >0.1p.u., T ω <10 p.u.

[0103] 1) Stable working condition

[0104] A power fluctuation of 100MW occurs at node 1 for a duration of 0.1s. After calculation, the optimized parameters are: K P_PLL =0.85p.u., K ω =0.72 p.u., T ω = 3.29 p.u. Comparison of power angle response curves before and after optimization of doubly-fed wind turbine control parameters Figure 7 shown. Depend on Figure 7 It can be seen that in this scenario, the wind power grid-connected system before and after parameter optimization can restore stability by itself. Through parameter optimization, the p...

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Abstract

The invention relates to a doubly-fed fan control parameter optimization method and system based on an energy stability domain, belongs to the technical field of fans, and solves the problem of stableoperation of a wind power grid-connected system at the present stage. The method comprises the following steps: establishing a wind power grid-connected system energy stability domain and determiningthe stability boundary; calculating the energy distance from the current operating point to the boundary of the energy stability domain and constructing the energy distance stability condition of a post-disturbance system, wherein the energy distance is the distance from the operating point of the wind power grid-connected system to the stability boundary along the disturbance direction for a period of time after the disturbance occurs; and establishing the objective function constraint conditions by aiming at the energy distance stability and optimizing and outputting the key control parameters of the doubly-fed wind turbine by using the improved plant simulation growth algorithm. The power angle stability level of the system can be effectively improved, and the oscillation of the grid-connected system can be suppressed in a certain range.

Description

technical field [0001] The invention relates to the technical field of wind turbines, in particular to a control parameter optimization method and system for a doubly-fed wind turbine based on an energy stability domain. Background technique [0002] Regarding the oscillation suppression of wind power grid-connected systems, the existing research mainly refers to the research experience in traditional damping control fields such as PSS and FACTS. By adding a damping controller, the output power of the wind turbine is adjusted so that it has the ability to suppress oscillation. It has not yet been considered in the provision of frequency Under the condition of support, how to ensure the stability of the power angle of the system, and the research on how to use the key control parameters inside the fan to stabilize the oscillation is still scarce. In fact, unreasonable parameter setting may lead to the low damping level or negative damping state of the wind turbine, threatenin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24H02P9/00H02P9/10H02P101/15
CPCH02J3/24H02J3/386H02P9/007H02P9/105H02P2101/15Y02E10/76
Inventor 马静赵冬张敏顾元沛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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