A controlled power inverter can cause instability at the point of common coupling (PCC) with its output filter and grid. This paper analyzes influence Phase-Locked Loop (PLL) on admittance single-phase current-controlled inverters different grid stiffness. It shows that PLL introduces a paralleled into inverter, which may lead to unintentional low-order harmonic oscillation in weak Moreover, Second Order Generalized Integrator (SOGI-PLL) is also modeled. found quadrature signal generator...

With the development of intelligent waterborne transportation, mining collision avoidance patterns based on spatiotemporal and motion data ships are crucial for autonomous navigation ships, which requires accurate information under various encounter scenarios. Addressing existing issues low precision false detection in algorithms, this paper proposes a behavior model considering The is Automatic Identification System (AIS) International Regulations Preventing Collisions at Sea (COLREGs); it...

The Organization for Economic Co-operation and Development (OECD) countries, which are the world's largest economies energy consumers, have significant effects on global greenhouse gas effect. And emergence of GVCs has complicated relationship between trade Carbon Dioxide () emissions. Under GVC division labor system, it is necessary to study its impact from perspective added value, can make an important contribution reducing world First, in this study, value chain participation indices OCED...

A controlled power inverter can cause instability at its point of common coupling (PCC) with input filter and the grid. Small-signal stability such systems be determined by applying impedance-based criterion. The influence Phase-Locked Loop (PLL) on output admittance single-phase current-controlled inverters different grid stiffness is analyzed in this paper. It shows that PLL introduces a negative paralleled into inverter, which may lead to unintentional low-order harmonic oscillation weak...

The replacement of traditional fossil fuels by renewable energy sources (RESs) leads to the loss power grid's frequency support capability while reducing greenhouse effect. To improve primary reserve (PFR) and inertia response (IR) grid, a configuration method for an storage system (ESS) is proposed. relationship between maximum fluctuation that can withstand proportion RESs deduced in this paper considering requirements. capacity control parameters ESS under third-order virtual synchronous...

Convexity of a yield function must be guaranteed to ensure unique relationship between plastic strain increments and stress components. A geometry-inspired numerical convex analysis (GINCA) approach is developed analyze the convexity function. The verified by computation domains for several typical functions Drucker, Cazacu-Barlat2004, Hu2017, Cazacu2018 newly proposed differential-anisotropic hardening. GINCA applied Gao2011 since it was not determined yet. also used determine domain...

With respect to the dynamic target tracking issue in obstacle environment, this article provides a collision-free framework combining modified guidance vector field (GVF) and disturbance rejection controller. More specifically, two primary improvements are implemented compared with existing GVF methods. The first improvement involves designing variable property deforming elliptic integral curves straight lines pointing point, which prevents robot from detouring. other is construct an...

This paper presents the discrete state space mathematical model of end-effector in industrial robots and designs linear-quadratic-Gaussian controller, called LQG controller for short, to solve low frequency vibration problem. Though simplifying as cantilever beam, this uses subspace identification method determine output dynamic response data establishes model. Experimentally comparing influences different input excitation signals, Chirp sequences from 0 Hz 100 are used final estimation...

Abstract With the innovation and development of science technology, convenience intelligence home life has become a trend. This intelligent drying rack system based on Internet Things uses OneNET cloud platform as information port, selects STM32F103C8T6 single-chip microcomputer main control chip to read, judge output execution signal from collected by sensor. The smart can be operated manually remotely through touch screen, related hardware circuits mobile phone APP, which extension...

Phase-looked Loop (PLL) is a critical component for the control and grid synchronization of grid-connected power converters. This paper presents benchmarking study on small-signal dynamics three commonly used PLLs single-phase converters, including enhanced PLL, second-order generalized integrator based inverse-PLL. First, unified model those established comparing their dynamics. Then, systematic design guideline parameters tuning formulated. To confirm validity theoretical analysis,...

The accumulation of space charge in a coaxial cable under high-voltage direct current (HVDC) may lead to the serious distortion internal electrical field, and thus extremely affect long-term reliability service.Therefore, it is significant measure characteristic full-size power real time.However, because existence temperature gradient across insulation DC stress, density dielectric will be inhomogeneous.Moreover, effect structure on measuring waveforms has taken into consideration.In this...

The fault location of power cables plays an important role in quickly finding points. In this paper, the method cable high-resistance faults is studied by using pulse current method, and breakdown reflection waveforms with without time delay are measured respectively, which verify effectiveness for location.

The high proportion of renewable energy sources (RESs) in the system reduces frequency support capacity and aggravates generation unbalanced power, while dynamic dispersion makes it difficult for a centralized storage (ESS) to take into account requirements different regions. In this context, research takes region with penetration RESs frequent power fluctuations as grid node ESS. By configuring parameters ESS under control strategy virtual synchronous generators, inertia primary reserve are...

The distribution of SO2 in a boiler is an important factor affecting tube corrosion furnace. To investigate the correlation between and numerous variables (e.g., temperature, O2 distribution, etc.), hybrid deep learning model developed via computational fluid dynamics (CFD) simulation data. First, combustion process under typical working conditions simulated to output training data set. Then, LASSO algorithm adopted select input with high distribution. Finally, belief network combined...

Piezo-actuated stage (P-AS) has become the topic of considerable interest in realm micro/nanopositioning technology recent years owing to its advantages, such as high positioning accuracy, response speed, and large output force. However, rate-dependent (RD) hysteresis, which is an inherent nonlinear property piezoelectric materials, considerably restricts application P-AS. In this research paper, we develop a Hammerstein model depict RD hysteresis An improved differential evolution algorithm...

Developing agent-based collaborative multi-satellite formation flying simulation system is of great significance for the study complex change process in multisatellite flying. We first studied satellite relative kinetic model and consider effect J2 perturbation on model. Then we used adaptive decoupling generalized minimum variance control method which based state-space identification technology to In order verify performance method, designed a system. Simulation results showed that could...