Frequency dynamic optimization control method and system of virtual synchronous fan

A virtual synchronization and dynamic optimization technology, applied in control systems, control generators, wind power generation, etc., can solve problems that threaten the safe and stable operation of the system, weaken inertial capacity, limit the penetration rate of new energy power generation such as wind power, etc.

Active Publication Date: 2020-09-22
HUAZHONG UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As new energy generation represented by wind power gradually replaces some conventional synchronous power sources in the power system, its frequency response characteristics and static output characteristics, which are significantly different from synchronous generators, will undoubtedly profoundly affect the frequency dynamic behavior of the system. It will weaken the inertial capability of the system, bring new challenges to the power supply adequacy of the power system, deteriorate the frequency dynamics of the system, and threaten the safe and stable operation of the system. In turn, it will limit the penetration rate of new energy generation such as wind power and restrict its long-term development Sustainable and healthy development

Method used

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  • Frequency dynamic optimization control method and system of virtual synchronous fan
  • Frequency dynamic optimization control method and system of virtual synchronous fan
  • Frequency dynamic optimization control method and system of virtual synchronous fan

Examples

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Embodiment 1

[0052] figure 1 The structure diagram of the doubly-fed fan is shown: the stator of the doubly-fed fan is directly connected to the grid-connected transformer, the rotor is connected to the grid-connected transformer through a back-to-back converter, and the other end of the transformer is connected to the grid. AC three-phase voltage U at the grid connection point in the figure abc , Grid-connected point AC three-phase current i abc 、Rotor speed ω r And DC voltage U dc , Is the signal to be collected related to the embodiment of the present invention.

[0053] figure 2 Shows the control structure diagram of a virtual synchronous doubly-fed wind turbine with frequency optimization control provided by an example of the present invention: the controller includes active power control, reactive power and terminal voltage control, and frequency optimization control. Phase-locked loop through the grid point AC three-phase voltage U abc Calculate the AC grid frequency f and the freque...

Embodiment 2

[0061] Figure 4 The structure diagram of the direct-drive fan is shown: the stator of the direct-drive fan is connected to the grid-connected transformer through a back-to-back converter, and the other end of the transformer is connected to the grid. AC three-phase voltage U at the grid connection point in the figure abc , Grid-connected point AC three-phase current i abc And DC voltage U dc , Is the signal to be collected related to the embodiment of the present invention.

[0062] Figure 5 Shows the control structure diagram of a virtual synchronous direct-drive wind turbine with frequency optimization control provided by an example of the present invention: the controller includes active power control, reactive power and terminal voltage control, and frequency optimization control. The specific control block diagram of the frequency optimization controller is in image 3 Shown in. Phase-locked loop through the grid point AC three-phase voltage U abc Calculate the AC grid fr...

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Abstract

The invention discloses a frequency dynamic optimization control method and system of a virtual synchronous fan. Specifically, in an electric power system comprising a virtual synchronous fan, under the normal operation state of the virtual synchronous fan, the frequency of the electric power system is changed due to the influence of load disturbance, and a frequency dynamic optimization method needs to be added to optimize the frequency dynamic of the electric power system after disturbance. According to the invention, only frequency-based preceding-stage control needs to be added to reactivepower control of the virtual synchronous fan, and a filtering link, a differential link and a proportional link are carried out; after the electric power system is disturbed, the change of a frequency signal is transmitted to a reactive power instruction to cause the change of the terminal voltage of the virtual synchronous fan, and finally the change of the active power of the electric power system is correspondingly caused, thereby optimizing the frequency dynamic of the electric power system, and guaranteeing the safe and stable operation of the electric power system and the friendliness of a power grid.

Description

Technical field [0001] The invention belongs to the field of safe operation of power systems, and more specifically, relates to a method and system for dynamically optimizing the frequency of a virtual synchronous fan. Background technique [0002] With the widespread application and rapid development of new energy power generation technology represented by wind power generation, the penetration level of new energy power generation in the power system due to its environmental advantages has continued to increase, and the traditional power generation equipment with synchronous generators as the leading power generation equipment The system is facing important changes. The basic goal of power system operation is to provide users with high-quality power that meets certain voltage and frequency indicators. While new energy generation continues to increase, new energy generation equipment such as wind power generation is significantly different from the dynamic characteristics of trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38H02P9/10
CPCH02J3/381H02P9/105H02J3/241H02J2300/28Y02E10/76
Inventor 胡家兵何维章晓杰迟永宁雷雨汤海雁李琰
Owner HUAZHONG UNIV OF SCI & TECH
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