Optimization and Coordination of HAFDV PINN Control by Improved PSO

The new hybrid active filter (HAF) is composed of the larger-capacity passive filter banks and the smaller-capacity active filter. It is difficult to tune the parameters of a PI controller using the DC capacitor voltage control. In this paper, the improved particle swarm optimization (improved PSO) algorithm is proposed to solve the coordinated design problem, and the neural network weights as the particle swarm optimization are adopted to optimize the system parameters. Comparing with the conventional PI controller, the results of PINN controller prove the effectiveness of designed method on both the transient and steady-state performance of the hybrid active filter DC bus voltage (HAFDV) controllers

Weight-Constrained Reliability Allocation for All Electric Aircraft Powertrains

The shift towards electric aircraft poses significant challenges in balancing lightweight design and high reliability of powertrains. Typically, improving reliability requires redundancy, which adds weight, while lightweight designs often compromise reliability. In this paper, we propose a weight-constrained reliability allocation model for the powertrain design of electric aircraft. The relationship between reliability and weight for each component, including battery, inverter, and electric motor is analytically and linearly expressed using universal generating functions (UGF) and McCormick envelope technique. Our model considers variable operating conditions that impact component reliability, such as changes in core temperature caused by high-attitude and variable thrust power caused by wind speed and direction. Our approach enhances the overall performance of electric powertrains systems for aircraft. Using the " Spirit of Innovation " electric aircraft as a case study, the proposed method can improve the powertrain reliability from 0.9786 to 0.9870 through reasonable allocation without adding extra weight. Alternatively, it can reduce the weight by 3.1% without compromising the reliability of the powertrain.</p

Wavelet-based EMTR method for fault location of VSC-HVDC transmission lines

A wavelet-based electromagnetic time reversal method for locating faults in voltage source converter-high-voltage direct current (VSC-HVDC) transmission lines is proposed in this study. This principle, firstly, is to use wavelet decomposition to filter the 1-mode fault currents, which are recorded at ends of the transmission line. Secondly, the filtered currents are mirrored on time axes, which called time reversal. Thirdly, the time-reversed currents are set as current sources at ends of the lossless mirror lines. Through assuming a fault at each point of line, the assumed fault currents are calculated, and the RMS of fault current at actual fault location is maximal according to a strict scientific proof. Theoretically, the Wavelet-based Electromagnetic Time Reversal (WEMTR) method is robust against fault types and resistance. A multilevel converter-HVDC system is established in Power Systems Computer-Aided Design (PSCAD)/Electromagnetic Transients including DC (EMTDC) to verify the feasibility of the proposed method, and the transmission line is simulated by frequency independent phase model. The results show that, the fault location can be calculated exactly without high sampling rates

C I R E D 22 nd International Conference on Electricity Distribution M MU UL LT TI IF FU UN NC CT TI IO ON NA AL L D DI IS SP PA AT TC CH HE ER R T TR RA AI IN NI IN NG G S SY YS ST TE EM M F FO OR R S SU UB BS ST TA AT TI IO ON N

ABSTRACT Using the dispatcher training system (DTS

Novel grid connection interface for utility-scale PV power plants based on MMC

The ever-increasing integration of photovoltaic (PV) energy has led to the fast development of utility-scale PV power plants worldwide. A novel grid connection interface for utility-scale PV power plants based on the modular multi-level converter (MMC) is explored. The grid connection interface is a DC boost interface by nature. It adopts the multistring topology, employs DC/DC boost converters, utilises a centralised MMC, and integrates an energy storage system. Meanwhile, the two-level control system for the DC boost interface is also designed. Compared with the conventional AC boost interfaces, the proposed DC boost interface avoids problems regarding reactive power transmission, harmonic resonance, and synchronous stabilisation. It also improves the power quality, efficiency, and the integration capacity of the PV generation. A case study of a utility-scale PV power plant with the DC boost interface is carried out in PSCAD/EMTDC. The simulation results validate the effectiveness and the merits of the DC boost interface under different operation conditions. The proposed DC boost interface proves more suitable for utility-scale PV power plants in areas with high solar irradiance. It also lays a solid foundation for the future research regarding the control and protection of utility-scale PV power plants

Lyapunov-Based Large Signal Stability Assessment for VSG Controlled Inverter-Interfaced Distributed Generators

Inverter-interfaced distributed generators (IIDGs) have been widely applied due to their control flexibility. The stability problems of IIDGs under large signal disturbances, such as large load variations and feeder faults, will cause serious impacts on the system. The virtual synchronous generator (VSG) control is an effective scheme for IIDGs to increase transient stability. However, the existing linearized stability models of IIDGs are limited to small disturbances. Hence, this paper proposes a Lyapunov approach based on non-linearized models to assess the large signal stability of VSG-IIDG. The electrostatic machine model is introduced to establish the equivalent nonlinear model. On the basis of Popov&rsquo;s theory, a Lyapunov function is derived to calculate the transient stability domain. The stability mechanism is revealed by depicting the stability domain using the locus of the angle and the angular frequency. Large signal stability of the VSG-IIDG is quantified according to the boundary of the stability domain. Effects and sensitivity analysis of the key parameters including the cable impedance, the load power, and the virtual inertia on the stability of the VSG-IIDG are also presented. The simulations are performed in PSCAD/EMTDC and the results demonstrate the proposed large signal stability assessment method

Identification and Isolation of Faults in Multi-terminal High Voltage DC Networks with Hybrid Circuit Breakers

This paper presents a protection scheme to protect multi-terminal high voltage dc (MTDC) networks for interconnection of renewable energy sources. The proposed scheme detects faults by using the Consecutive Data Window Method (CDWM) and harmonics of the system voltage to avoid maloperation of breakers without communication. Fault location is classified and faulty parts is isolated from the rest of the healthier network by using hybrid circuit breakers (HCBs). Moreover; it also categorises the fault with the help of the voltage drop. The rapid response to isolate the faulty portion in a few milliseconds is primarily considered to enhance the reliability and security of the network. The results of simulations verify the efficient fault detection and isolation for different DC faults and the investigation for the impact of significant parameters of the proposed scheme has been considered. The simulations are performed in PSCAD for four terminal MTDC networks to validate the proposed scheme. The performance is also verified under different fault conditions by using Matlab after computing the data from simulations