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Stability Analysis and control of DC Distribution System with Electric Vehicles

Energy Engineering 2023年第3期120卷 633-647页

作者： Zhijie Zheng Song Zhang Xiaolei Zhang Bo Yang Fang Yan Xiaoning Ge State Grid Shandong Electric Power Company Economic and Technological Research Institute JinanChina State Grid Shandong Electric Power Company Limited JinanChina State Nuclear Electric Power Planning Design&Research Institute Company Limited BeijingChina

The DC distribution network system equipped with a large number of power electronic equipment exhibits weak damping characteristics and is prone to low-frequency and high-frequency unstable oscillations.The current interpretation of the oscillation mechanism has not been unified.Firstly,this paper established the complete statespace model of the distribution system consisting of a large number of electric vehicles,characteristic equation of the distribution network system is derived by establishing a state-space model,and simplified reduced-order equations describing the low-frequency oscillation and the high-frequency oscillation are obtained.Secondly,based on eigenvalue analysis,the oscillation modes and the influence of the key system parameters on the oscillation mode are studied.Besides,impacts of key factors,such as distribution network connection topology and number of dynamic loads,have been discussed to suppress oscillatory instability caused by inappropriate design or dynamic interactions.Finally,using the DC distribution example system,through model calculation and time-domain simulation analysis,the correctness of the aforementioned analysis is verified.

关键词： DC distribution network system oscillation instability reduced-order equivalent model damping control sensitivity analysis

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Research on the Performance of Passive Heave Compensator for Tethered Remotely Operated Vehicle System

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Journal of Shanghai Jiaotong university(Science) 2011年第1期16卷 40-44页

作者：吴开塔姚宝恒付斌任平连琏 State Key Laboratory of Ocean Engineering Shanghai Jiaotong University Underwater Technology Institute Shanghai Jiaotong University

A passive heave compensator is designed to enhance the operation safety of a 4.5 km remotely operated vehicle (ROV).This paper proposes a novel idea of designing a compensator with relatively low natural period to optimize gas volume and while adding a special device to remove the problem of ineffectiveness and resonance in long seas.Numerical simulations are done based on serious dynamic model of the whole system,including the compensator,the umbilical tether and the vehicle,solved by the fourth-order Runge-Kutta scheme.The compensator provides great attenuation of motion and tension in most sea states.As the working depth increases,the system natural period decreases,resulting in the occurrence of risk of resonance.By regulating the system damping,the compensator can be effective in these situations.

关键词： heave compensation spring isolation nonlinear dynamics damping control

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