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To manage the microgrid effectively, it is important to get the power information among multiple distributed generation (DG) units. However, when the droop control method is adopted, as the corresponding DG units cannot be simply modeled as VF or PQ buses, the conventional power flow algorithm may become inapplicable. To solve this issue, a time domain iteration (TDI) based power flow algorithm is...
A power electronics transformer (PET) based on dual active bridge (DAB) with input series and output parallel (ISOP) cascaded topology is studied in this paper. Fe-based nanocrystalline alloys transformer cores and Silicon Carbide (SiC) power MOSFETs are adopted to improve the power density and efficiency. Mathematical derivation of the input voltage distribution is deduced with the conclusion that...
This paper proposes improved multi-loop control strategies for three-phase four-leg virtual synchronous generator with unbalanced loads. Through the decoupling control of active and reactive power, inverter can simulate the characteristics of synchronous generator, including primary frequency modulation, primary voltage modulation, inertia and excitation characteristics. To improve the dynamic performance...
In this paper, the issues of derating design of integrated circuit are discussed. The disadvantage of the traditional derating design method is discussed. This paper puts forward the method using Saber to simulate the electric stress of the electronic product, which can improve the accuracy of the result and the speed of the transient stress calculation. The method that uses derating analysis based...
This paper proposes a flexible compensation strategy for parallel-connected doubly fed induction generators (DFIGs) when connected to an unbalanced weak grid. The proposed strategy has two main advantages: 1) the voltage unbalance factor (VUF) at the point of common coupling (PCC) can be continuously controlled, thus the flexible trade-off between the balanced DFIG output current and the balanced...
A Generating system of unsteady flow rate for gas using an isothermal tank is proposed. With the servo valves installed at upstream and downstream of the isothermal tank, the unsteady flow can be completely controlled. Moreover, by analyzing the characteristics of the servo valve, a feed forward compensator is designed to improve the response of the system. A fuzzy-PID controller is introduced for...
This paper presents a 40-Gb/s phase-locked clock and data recovery (CDR) circuit with 1:4 demultiplexer in IBM 90-nm CMOS technology. The CDR circuit incorporates an inductorless eight-phase LC voltage-controlled oscillator (VCO) and a quarter-rate bang-bang phase detector (PD). A novel inductorless eight-phase LC VCO including four LC oscillator cells is presented to generate the eight-phase outputs...
The state equations of RLCM active network over F(z) are formulated in this paper by analyzing the topologic structure and the cut-set matrix Ql. The computer programming of the state equations is considered and Purslow's conclusion of the state equation is improved. We also give an example to illustrate this.
Solar energy is considered as one of the most effective, less expensive, harmless and less environment pollution effect of renewable energy sources. The problem of using solar power including varying weather condition brings different output power of the photovoltaic (PV) array, which may cause a serious waste of solar power. For solving this problem, a Maximum power point tracking (MPPT) strategy...
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