双馈风机等效惯量控制比例系数对系统功角首摆稳定的影响机理分析

doi:10.19595/j.cnki.1000-6753.tces.211305

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Abstract Compared with traditional synchronous machines, doubly-fed Induction Generator (DFIG) lacks inertial response capability. Therefore, when a large-scale DFIG is connected to a power system suffering from large or small disturbances (three-phase short circuit, sudden load increase, etc.), the system inertial response capability is severely lacking and the problem of transient power angle stability is highlighted. With the continuous improvement of the DFIG virtual inertia control technology, the DFIG can provide dynamic inertia support for the system. Therefore, there is an urgent necessity to carry out research on the mechanism of the effect of the DFIG's virtual inertia on the first swing stability of the system power angle. To address these issues, this paper proposes a mechanism analysis method for the effect of equivalent proportional coefficient of virtual inertia control of DFIG on stability of first swing of power angle.
Firstly, the equivalent model of two regional inertia centers is derived, and the influence of DFIG virtual inertia on the rotor motion equations of the two regions is analyzed. Secondly, from the perspective of the transient energy of the system, the influence of the equivalent proportional coefficient of virtual inertia control of DFIG in the two regions on the transient energy during the acceleration and deceleration of the system is studied when the swing direction of system power angle are different and the swing direction of influence mechanism on the first swing stability of system is further studied. Finally, the stability of the system was evaluated by the maximum deviation of the system power angle and a simulation model of the two-region interconnection system was built in PSASP to verify the proposed theory.
Considering the DFIG in sending and receiving ends with additional inertia control, the following conclusions can be drawn from the simulation analysis: ①When a three-phase short circuit fault occurs in the system, the power angle of the system swings in the positive direction, and the DFIG inertia response changes the transient energy during system deceleration. If the equivalent proportional coefficient of the DFIG's virtual inertia control link is greater than zero, the stability of the system power angle first swing is weakened, and the absolute value of the equivalent proportional coefficient of the DFIG's virtual inertia control link is reduced, which is conducive to the stability of the system power angle first swing, otherwise, it is not conducive to the stability of the system power angle first swing. ②When the system load suddenly increases, the power angle of the system swings in the opposite direction, and the DFIG inertia response changes the transient energy during the system acceleration and deceleration. If the equivalent proportional coefficient of the DFIG's virtual inertia control link is greater than zero, the stability of the system power angle first swing is enhanced, and the absolute value of the equivalent proportional coefficient of the DFIG's virtual inertia control link is increased, which is conducive to the stability of the system power angle first swing, otherwise, it is not conducive to the stability of the system power angle first swing.

Key words： Doubly-fed induction generator(DFIG) equivalent proportional coefficient of virtual inertia control transient energy function the first swing stability of power angle

Received: 17 August 2021

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TM614

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	Wang Ke
	Qin Wenping
	Zhang Yu
	Zhu Zhilong
	Xue Shaokai

Cite this article:

Wang Ke,Qin Wenping,Zhang Yu等. Mechanism Analysis of Effect of Equivalent Proportional Coefficient of Inertia Control of DFIG on Stability of First Swing of Power Angle[J]. Transactions of China Electrotechnical Society, 2023, 38(3): 741-753.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211305 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I3/741

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