Energy conservation law and its application for the direct energy method of power system stability

Moon, Young-Hyun; Cho, Byoung-Hoon; Lee, Yong-Hoon; Hong, Hyo-Sik

doi:10.1109/pesw.1999.747540

Cited by 24 publications

(2 citation statements)

References 7 publications

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“…Distributed generators based on non-rotating power electronics will significantly reduce the overall inertia factor of the system due to the widespread use of renewable energy sources. To measure the active regulation capability of the power electronics interface, the existing concept of rotational inertia and primary FM modulation coefficient is generalized [20,21].…”

Section: Multi-energy Microgrid Inertia Analysismentioning

confidence: 99%

Frequency stability control method for multi-energy system considering storage characteristics and transmission inertia of hot and gas pipeline network

Zuo,

Teng,

Chen

2024

Sci. Tech. Energ. Transition

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The grid-connected capacity of renewable energy generation in multi-energy microgrid is increasing. This leads to a decrease in the inertia level in the microgrid, which has a great impact on the frequency stabilization control. This article proposes an adaptive control method for frequency control of inertia in multi-energy microgrids. Firstly, the system frequency fluctuation problem is addressed. Analyze the response characteristics of virtual inertia and the influence of physical inertia of rotating equipment on system frequency dynamics in multi-energy microgrid. Secondly, study the energy transfer characteristics of electric, thermal and gas systems in multi-energy microgrids. The energy coupling model between the subsystems in the multi-energy microgrid is established. And according to the difference of energy transmission time inertia of electric, heat and gas subsystems, the microgrid inertia response time model of different energy systems is established. Then, according to the energy balance stability criterion of multi-energy microgrid, combined with the current operating state of the system and the state of the higher-level distribution network, the fast response adaptive over-compensation control of multi-energy microgrid cluster is carried out to realize the inertia allocation in multi-energy microgrids. Finally, the proposed advanced frequency control method of multi-energy microgrid considering inertia demand is verified by simulation.

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Section: Multi-energy Microgrid Inertia Analysismentioning

confidence: 99%

Frequency stability control method for multi-energy system considering storage characteristics and transmission inertia of hot and gas pipeline network

Zuo,

Teng,

Chen

2024

Sci. Tech. Energ. Transition

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“…The energy function construction is based on the pure mathematical definition, but the potential energy and dissipated energy contained in the energy function have the same expression as the energy in the real physical process. In the work of Moon et al (1999), a method has been introduced to derive the system's transient energy function from the nodal current equations. The transient energy of the system can be obtained by integrating the branch circuit and node information.…”

Section: Multiple Time Scale Characteristics Of the Pmsgmentioning

confidence: 99%

Analysis of sub-synchronous oscillation characteristics of PMSGs based on transient energy

Yan,

Wang,

Yang

et al. 2023

Front. Energy Res.

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Faced with the problem of sub-synchronous oscillation (SSO) caused by the interaction between permanent magnetic synchronous generator (PMSG)-based wind farms and weak AC grids, we construct a transient energy function model that follows the structure of a PMSG. The transient energy composition of a PMSG is analyzed, and the dissipation energy expression that can intuitively reflect the development trend of SSO is derived, reflecting the damping level of a grid-connected wind power system. Furthermore, in response to the problem of mutual coupling between the control links of the PMSG during the SSO process, which hinders oscillation characteristic assessment, a method based on oscillation energy is proposed to analyze the oscillation characteristics. Considering the dynamic changes in the output of the phase-locked loop during sub-synchronous oscillation, the transient energy dominated by various control links is derived, and the effects of the phase-locked loop, current inner loop, and voltage outer loop on transient energy and oscillation characteristics are analyzed. The simulation verifies the effectiveness of the analysis of the transient energy model.

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A transient energy function for power systems including the induction motor model

Min

Chen

2007

SCI CHINA SER E

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A construction method for power system transient energy function is studied in the paper, which is simple and universal, and can unify the forms of some current energy functions. A transient energy function including the induction motor model is derived using the method. The unintegrable term is dealt with to get an approximate energy function. Simulations in a 3-bus system and in the WSCC 4-generator system verify the validity of the proposed energy function. The function can be applied to direct transient stability analysis of multi-machine large power systems and provides a tool for analysis of the interaction between the generator angle stability and the load voltage stability.power system stability, transient stability, energy function, direct method, induction motor There are two types of methods for power system transient stability analysis: the time domain approach and the direct method [1,2] . The time domain approach is applicable to detailed power system models, so it is dominant in transient stability analysis of power systems. However, it has the disadvantage of intensive time consumption. The direct method is based on the second method of Lyapunov and LaSalle's invariance principle. Early researches of the direct method focused on developing Lyapunov functions for power systems with different approaches. In the end of 1970s, Athay, Kakimoto et al. [3,4] proposed the concept of transient energy function. They developed a transient energy function that could better reflect the physical characteristics of practical power systems from the viewpoint of system energy, and promoted the development of the direct method. The transient energy function is a possible Lyapunov function but loosens the constraint of being positive definite [5] . Compared with the time domain approach, the direct method based on transient energy functions has the advantage of speed and can provide information regarding the degree of stability. So it is suitable for on-line applications. However, one of the disadvantages of the direct method is that the model used is excessively simple. Construction of

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Energy conservation law and its application for the direct energy method of power system stability

Cited by 24 publications

References 7 publications

Frequency stability control method for multi-energy system considering storage characteristics and transmission inertia of hot and gas pipeline network

Frequency stability control method for multi-energy system considering storage characteristics and transmission inertia of hot and gas pipeline network

Analysis of sub-synchronous oscillation characteristics of PMSGs based on transient energy

A transient energy function for power systems including the induction motor model

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