This paper focuses on the mult-layer unmanned aerial vehicles (UAVs) formation keeping control issue based multi-agent bifurcation consensus. Taking two-layer as an example, due to delays in receiving and responding signals, intra-layer inter-layer schemes under dynamic properties need be considered. Firstly, UAV heading autopilot is designed fully consider of angle attack yaw angle, which utilized deal with translational angular motion UAV. Based autopilot, stability Hopf conditions UAVs...

We show that delay-differential equations (DDE) exhibit universal bifurcation scenarios, which are observed in large classes of DDEs with a single delay. Each such universality class has the same sequence stabilizing or destabilizing Hopf bifurcations. These sequences and can be explicitly described by using asymptotic continuous spectrum for delays. Here, we mainly study linear DDEs, provide general transversality result delay-induced bifurcations, consider three most common classes. For...

Solutions for expected shear force and rotation across joints connecting rigid pipes are formulated use in the structural design of pipe possible inclusion current standards. The loading system is divided into live earth loading, these cases treated separately. Exact algebraic solutions derived using beam-on-elastic-spring approximation two connected by a moment-release joint, which considered conservative. Additional discussions also presented about conservative nature...

The rise of high-speed railway induces an increased probability serious derailment accidents operating trains during earthquakes. A two-and-half-dimensional finite element model (2.5D FEM) was developed to investigate the ground vibration under combined seismic and train loads. Numerical examples were demonstrated proposed method turned out provide effective means for estimating caused by load dynamic displacement loads increases with increase speed, decreases stiffness soil. Compared alone,...

The aerospace plane is an innovative kind of reusable aircraft, which able to reach the low earth orbit flying like conventional plane. Two kinds wing structures are designed and parameterized for delta with a strake, one equal percentage multi-web structure, other parallel structure. two types structure layouts were analyzed in subsonic, transonic, supersonic, hypersonic conditions using finite element method. Contrasting strength stiffness characteristics, estimating weight, it...

With the increasing demand for renewable energy, stability of multi-paralleled grid-connected inverters is important factor evaluation capacity connected to power grid. In this paper maximum assessment using global-admittance based harmonic analysis proposed. The method with global admittance has clear physical concept and convenient real-time calculation. illustrated first. are sorted by capacity. sequence can be divided into two groups on stable critical point obtained method. group large...

An accurate model of network topology is the fundamental to design a new protocol. Recent efforts have been made produce many topologies for Internet, but few can give attention power-law distribution characteristic in each tier Internet. We propose Leetar, Internet generator, which generate that contains tiers and match characteristic. By emulating Leetar simulator, it successfully most characteristics Finally, we make comparisons between other generators. The simulation results indicate...

Considering further optimizing control costs and improve the stability of joint delivery system, emergency generator tripping strategy wind-thermal bundling system is changed from only thermal power unit to coordinated strategy. During fault, influence wind farm on angle determined by its low voltage ride through (LVRT) Therefore, it should be meaningful for according transient characteristics make accurate selection carry out tripping. Aiming at this problem, necessary analyze LVRT how...

It is difficult to deal with the randomness and volatility of new power system in fault disposal mode grid, this paper proposes a method grid auxiliary decision generation based on generative adversarial imitation agent. Firstly, generator network constructed, generated by observing operation status condition. The expert dispatch experience sensitivity calculation results are used as strategies guide learning network. Then, discriminant constructed identify strategy output discrimination...

Control stability when Multi-level STATCOM is applied on weak power system discussed in this paper. In order to research the of quantitatively, current inner open-loop transfer function with impedance presented. Nyquist curve used demonstrate relationship between and control performance. Then a new strategy - adding current's proportion-differential (PD) feed forward voltage, proposed. This can eliminate positive feedback action caused by impedance. Finally, test result proves that above...

Flexible DC transmission technology can isolate the impact of faults to a certain extent. It is grid-connected mode worthy in-depth study for large-scale wind farms. In this paper, operation control flexible direct power delivery system reviewed from aspects strategy and fault protection. Firstly, traversal performance VSC-HVDC summarized. Secondly, existing strategies are analyzed compared, advantages disadvantages systematically reviewed, after AC emphatically discussed. Finally, research...

The impact on the grid transient stability under action of coordinated control strategy is unclear for multi-terminal voltage source converter-based high direct current transmission (VSC-HVDC) system receiving converter stations connected to different locations same AC grid. existing optimization scheme single station fault ride-through improve increases change DC VCS-HVDC and reduces voltage. How take advantage VSC-HVDC security needs be studied. Based Zhangbei project, external power key...