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A photovoltaic (PV) array show multi local maximum power points mode under partially shaded conditions, where the operating point of the PV system tends to converge to a local maximum power point (LMPP) which is not the real maximum power point. A novel MPPT method is proposed in this paper to achieve global maximum power point tracking (GMPPT) under partially shaded conditions. The behavior of I–V...
Groundwater source heat pump system has great impact on the temperature of groundwater for a long-term. According to the continuity equations, motion equations and energy equations of fluid cylindrical coordinate system and the boundary conditions of pumping production and injection well, the forced convection in turbulent flows model of smooth cylinder has been established. Consider three ways of...
Economic rationality is currently open pit stripping ratio is well calculated by comparing the cost of industrial exploitation, the calculation does not take into account the safety of mining work well accidents, such as surface subsidence caused by enormous economic losses, but also did not consider the open-pit mining on the ecology of environmental damage and environmental management costs, This...
For parallel inverters, the sinusoidal output ac voltages in the same-phase should be ensured. This paper presents a power weighted synchronous control method, which is suitable for parallel inverters of different power capabilities. The key concept of the proposed strategy is that the sinusoidal reference signal is decided by the common synchronous pulse signal, which is determined by the majority...
A novel type single-stage inverter is proposed in this paper. Details on operation principle, control strategy and circuit design of the new single-stage inverter are presented below. The single-stage inverter is constituted of two absolutely same bi-directional DC-DC Buck converters which get high frequency electrical isolation. The converters' input and output are individually in parallel and in...
The Diode-clamped three-level reversible converter is researched in this paper. The converter can operate in four quadrants with power flow in bi-direction. The low frequency model of the converter is built. The mode-switching between the rectification and inversion is analyzed in detail with the vector relationship between voltage and current derived. The control for rectification and inversion operation...
In view of the characteristic that the effect of controlling respirable dust is very poor in current mines. This text analyzes some characteristics of dust and some problems in current dedusting technology, which introduces several new dedusting technologies that are more suitable for mine. These dedusting technologies can achieve good result to respiratory dust and create a good working environment...
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