With the continuous development of science and technology and industrial technology, the global energy crisis is becoming increasingly severe. The shortage of traditional fuels and the environmental pollution problems caused by them are also increasing. At the same time, the continuous improvement and maturation of solar-based renewable energy technologies has provided a new path for solving the energy crisis. Therefore, many countries have turned their attention to distributed generation that uses renewable energy as an energy source.
Distributed power generation technologies include photovoltaic power generation, wind power generation, biomass power generation, gas turbines, and tidal power generation. At present, mainly at home and abroad to develop photovoltaic power generation and wind power generation. In particular, the technology R&D and market application of photovoltaic power generation is relatively mature.
Compared with the traditional large-scale centralized power distribution mode, the distributed power generation technology has the independence, real-time control of the power quality and performance of the regional power grid, low investment, flexible installation site, short construction period, high energy utilization rate. And environmental pollution and other advantages. However, the large-scale application and access of renewable distributed energy sources also bring huge challenges and impacts to traditional grids. The reasons are as follows:
1. The distributed renewable energy has randomness and volatility. It is obviously affected by its own energy characteristics and its controllability is relatively poor.
2. The access of distributed renewable energy sources has changed the basic pattern of traditional unidirectional power flows. Changes in the pattern will affect the power quality and reliability of power supply.
Based on the above analysis, in order to reduce the adverse effects of distributed power access to large power grids, and at the same time to make full use of energy in light of the characteristics and advantages of renewable energy sources, researchers have proposed a more flexible, intelligent, and more reliable system. ----Microgrid.
The emergence of microgrids can improve the randomness of distributed renewable energy and the low reliability of access. The main advantages are as follows:
1. It helps to improve the distribution network's ability to accept distributed energy;
2. It can effectively improve the utilization rate of distributed renewable energy, and provide corresponding power quality services according to actual application requirements.
3. It can reduce the loss of distribution network and optimize the operation mode of distribution network.
4. It can ensure the power supply of key load under the condition of grid fault and improve the reliability of power supply;
5. Can be used to solve power problems in remote areas, deserts or islands;
The micro-grid incorporates advanced information technology, control technology, and power technology to provide reliable power supply to meet a variety of user needs while ensuring that energy, economic, and environmental benefits are maximized. At the same time, the microgrid can provide grid support, improve energy efficiency, and save energy and reduce consumption in the conventional power grid. Micronet will be an indispensable part of the smart grid construction. In China, the promotion of micro-grid technology is a concrete embodiment of the road of sustainable development. It is a strong support for China to adjust its energy structure, solve power problems in remote areas, and protect the environment.
Line array sound is a speaker system, and its technology and manufacturing have been developing steadily for many years. Recently, the situation has changed, and linear array speaker systems have appeared at many major sports events and large performances in the world.Linear array is a group of radiating elements arranged in a straight line and closely spaced, and has the same amplitude and phase. Through linear transmission, the transmission distance is increased and the attenuation during sound transmission is reduced.The advantages of linear array sound reinforcement systems are obvious.
(1) Due to the characteristics of the linear array, the directivity in the vertical plane of the main axis is a narrow beam, and the energy superposition can be radiated at a long distance. The lower end of the curved part of the linear column covers the near area, forming a coverage from near to far.(2) The improvement of the linear array amplifier is more in line with the requirements of technology, process and installation. The middle high-frequency part is more special, 2 (JBL) or 3 (V) tweeter outlets are connected together fJ2j, JBL company called it a sound wave generator, E-V company called it a plane wave generator. According to the analysis with MAPP software, the directivity of the linear array becomes more and more uniform with the increase of frequency. When a certain frequency is reached, such as 1000Hz, the directivity is radial, that is, the flap appears in the directivity map. At this time, the acoustic waveformer composed of the tweeter comes into play, so that the high-frequency directivity is superimposed. (3) Linear arrays cannot ignore mutual interference, and linear arrays themselves do not improve sound quality.
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