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A Flywheel Energy Storage System (FESS) can solve the problem of randomness and fluctuation of new energy power generation. The flywheel energy storage as a DC power supply, the primary guarantee is to maintain the stability of output voltage in discharge mode, which will cause the variation of motor internal magnetic field. In this paper, taking a flywheel energy storage permanent magnet motor as...
In this paper, we report and demonstrate a divide-by −4.5 injection-locked fractional frequency divider using hybrid integrated circuits (PCB process). The presented frequency divider operates at a fundamental frequency of f0 = 2 GHz, and achieves an operation range of 187 MHz under a sweeping input frequency fin around 9 GHz. At a supply current of 5.8 mA, the DC power dissipation is 5.3 mW. The...
New high speed electric locomotives put into operation which use AC-DC-AC type of drive system has cause the influence of the electric railway load to the electrical network present the new features. In this paper, with the actual tests data in substation, researched the impact of 350km/h high-speed passenger line to grid power quality separately from harmonics, negative sequence and unbalance, voltage...
This paper describes two methods of harmonic measurement based on MAXQ3180 and MSP430FG4619 for grid. It details the composition of the hardware and software realization of harmonic measurement methods. Besides, it describes the principle of the MAXQ3180 internal harmonic measurement in detail; it introduces specific process of the two methods and the key issues that need be paid attention to in implementation.
The paper presents a hybrid power filter for suppressing harmonics caused by the nonlinear load in drilling rig electric power system, and analyzes the impact and the harm of the harmonic. The principle and the control method of system are discussed. A composite control model is adopted. The experimental results show that the hybrid power filter has the good characters of harmonics elimination and...
The modified harmonic balance finite element method was applied to investigate the DC biased problem in the saturated electromagnetic devices. The electromagnetic field was solved by the block Gauss-Seidel algorithm combined with the relaxation iterative method. The DC bias effects on magnetizing current and magnetic induction was analyzed by means of harmonic solution in multi-frequency domain. The...
The DC biased problem of the Epstein Frame-like core model is investigated by using the Harmonic Balance Finite Element Method (HBFEM). It considers coupling between the electric circuit and the magnetic field. The magnetizing current and its harmonic components can be calculated directly in the harmonic domain. Comparing the calculated results with the experimental data shows consistency. The DC...
The harmonic balance finite element method (HBFEM) is combined with the fixed-point technique to calculate the steady-state magnetic field in a laminated core model (LCM). The magnetic intensity is divided into linear and nonlinear parts in the form of harmonics. The hysteresis model based on the consuming function is taken into account in the harmonic computation. The magnetic field and magnetizing...
DC bias of transformers will generate some important effects on power transformers. Furthermore it can bring about a malfunction of the power system. A simulation model is set up and the equivalent coupled electric circuit and magnetic circuit method is used to analyze the electromagnetic influence of DC bias. The method is testified by experiment results. Some results are concluded from the analysis...
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