new energy photovoltaic on grid solar power system technology
Welcome to the information network of solar photovoltaic power technology. Here, we provide information about photovoltaic cells, solar power system circuit topology and on grid solar system Inverter control strategy, etc.
Do you know the solar photovoltaic power technology? We will introduce basics of photovoltaic cells
Photovoltaic miniature inverter produced by American Phase Energy Co., Ltd. is shown in Figure 7.15. The front stage uses an active clamp interleaving flyback converter for sinusoidal PWM wave modulation, forms a power frequency sinusoidal half wave envelope through a high-frequency flyback transformer and a fast recovery diode rectifier circuit, and the rear stage uses […]
1.The impact of part of the shadowSome shadows are divided into hard shadows and soft shadows. Soft shadow refers to some shadow problems caused by dust, fallen leaves, clouds, snow, shadows, tall buildings, etc. The hard shadow components of the hard shadow are aging due to different orientation, angle, parameters, and some battery components. The […]
1. Parallel transformer detection methodThe detection circuit of the parallel transformer detection method consists of a small -power industrial frequency transformers with a Tan ratio of 1: 1, and the sub -filter circuit of the sub -edge of the sub -edge of the small power. The DC voltage component in the power grid is mainly […]
In recent years, the photovoltaic industry has developed rapidly, the non-isolated photovoltaic grid-connected power generation system has developed rapidly, and the photovoltaic grid-connected capacity has increased significantly. Therefore, the impact of the injection of the DC current component into the AC grid has attracted more and more attention, and the problem of injection of the […]
1.Refusol three-phase photovoltaic grid-connected power generation circuit: Refusol three-phase photovoltaic grid-connected power generation circuit consists of three single-phase circuits, which share two symmetric BOOST converters, and their common connection nodes are V1, V2, Vn, V3 and V4, as shown in FIG. 6.29. Each single phase has BUCK and BOOST working modes in half A grid […]
At present, many different islanding detection methods have been proposed. Generally speaking, islanding detection methods can be divided into two categories: remote technology and local technology. ①Remote technologyThe remote technology is to complete the detection through the communication between the power grid and the distributed power sources. It refers to the communication between the power […]
Photovoltaic modules of the same type are connected in parallel to form a parallel photovoltaic array, as shown in Figure 1. m(m≥2) battery modules are connected in parallel, the voltages on the battery modules are Vz1, Vz2, .. ., Vzm, the output currents are lz1, Iz2, …, Izm, and the output voltage of the parallel […]
① Equivalent mathematical model of photovoltaic arrayA single photovoltaic cell module is composed of multiple photovoltaic cells in series and in parallel. If the characteristics of each photovoltaic cell in the cell module match, under the same temperature condition and the light is uniform, the engineering mathematical model of the photovoltaic cell moduleIt can be […]
① Equivalent mathematical model of photovoltaic cellA typical equivalent circuit of a photovoltaic cell is shown in Figure 1, and its output characteristic equation can be described by equation (1): IPV=IPC﹣Io{exp[(q/nckcT)(VPV＋RSIPV)]﹣1}﹣(VPV＋RSIPV/Rsh) （1） In the formula, Io is the PN junction reverse saturation current of the equivalent diode inside the photovoltaic cell, and the mathematical expression […]
According to the materials used, photovoltaic cells can be divided into silicon photovoltaic cells, multi-compound photovoltaic cells and organic semiconductor photovoltaic cells, etc. ⑴Silicone photovoltaic cell①Single crystal silicon photovoltaic cellMonocrystalline silicon photovoltaic cells are manufactured from high-purity monocrystalline silicon wafers. The appearance of the cells and components is shown in Figure 1. The processing technology […]