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Quantitative evaluation method for transient synchronous stability of permanent magnet synchronous wind driven generator based on Lyapunov direct method

A wind turbine, permanent magnet synchronous technology, applied in the field of power system, can solve the problems of unfavorable grid-connected converter impedance stability, reducing the critical cut-off time of the power system, etc.

Inactive Publication Date: 2021-05-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

In addition, inappropriate PLL parameters will seriously reduce the critical cut-off time of the power system, and the high control bandwidth of the PLL is also not conducive to the impedance stability of the grid-connected converter.

Method used

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  • Quantitative evaluation method for transient synchronous stability of permanent magnet synchronous wind driven generator based on Lyapunov direct method
  • Quantitative evaluation method for transient synchronous stability of permanent magnet synchronous wind driven generator based on Lyapunov direct method
  • Quantitative evaluation method for transient synchronous stability of permanent magnet synchronous wind driven generator based on Lyapunov direct method

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Embodiment 1

[0074] The present invention adopts embodiment 1, verifies the effect of this method:

[0075] figure 2 It is a system structure diagram of Embodiment 1 of the present invention, which is a permanent magnet synchronous wind generator-infinite busbar system. image 3 It shows that the critical energy value Vcr=0.3702 of the system is determined by the potential energy boundary surface method, and then compared with the total energy of the system, the critical fault removal time of the system is determined t=0.523s, Figure 4 The fault is cut off at 0.52s, the relative angular frequency of the PLL in (a) gradually returns to 0, the angle of the PLL in (b) returns to the equilibrium point again, and the energy of the power system in (c) gradually decreases under the action of damping If it is as small as 0, it indicates that the power system is unstable. Figure 5 The fault is removed at 0.54s, the relative angular frequency of the PLL in (a) increases to infinity, the angle o...

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Abstract

The invention relates to a quantitative evaluation method for transient synchronous stability of a permanent magnet synchronous wind driven generator based on a Lyapunov direct method, and discloses a transient energy function method capable of quantitatively evaluating the transient stability of a wind power grid-connected system. The method comprises: based on the Lyapunov theory, constructing an energy function for a permanent magnet synchronous wind driven generator grid-connected system, used for quantitatively evaluating the transient synchronization stability of a fan; firstly, through reasonable order reduction of a grid-connected voltage source type converter control system, establishing a simplified fan grid side converter control model, and the model considering the influence of outer loop control on the dynamic characteristics of a phase-locked loop; then, deriving a fan synchronous motion equation similar to the synchronous machine rotor motion equation; on the basis of the synchronous motion equation, constructing a transient energy function of the fan by using a first integral method, and determining a critical energy value of the transient energy function by using a potential energy boundary surface method; and comparing the energy when the fault is removed with a critical energy value so as to judge the transient synchronization stability of the system. According to the method, the transient synchronous stability of the permanent magnet synchronous wind driven generator-infinite bus system is quantitatively evaluated.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a quantitative evaluation strategy for transient synchronization stability of a permanent magnet synchronous wind power generator grid-connected system. Background technique [0002] In the development and utilization of renewable energy, wind power is considered to be the most promising clean energy due to its outstanding advantages. Permanent magnet synchronous generator (Permanent Magnet Synchronous Generator, PMSG) has become one of the most widely used wind turbines due to its low speed, high efficiency, and flexible power control. The permanent magnet synchronous generator adjusts the electric energy through a grid-connected voltage source converter (Voltage Source Converter, VSC), and transmits it to the AC grid. The output and regulation characteristics of PMSG are significantly different from those of conventional synchronous machines. With the increasing proportion of win...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 王彤纪泰鹏刘光萌王增平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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