Core Tip: With the continuous development of society, the demand for electricity has increased year by year, making China pay more and more attention to the development of power companies. Especially after the 2008 snowstorm, the Southern Power Grid system was hit hard by the snowstorm. With the continuous development of society, the demand for electricity has increased year by year, making China pay more and more attention to the development of power companies. Especially after the snowstorm in 2008, the southern power grid system was hit hard by the snowstorm, which brought great inconvenience to the people of the south. Therefore, in the construction of infrastructure, the capital investment in power facilities has been increased. It not only expands the scale of power grid construction, but also introduces the concepts of new energy and renewable energy into the construction of power facilities. The emergence of micro-grid has alleviated the shortcomings of excessive distribution of power companies, poor background control performance, and poor operational flexibility. During the operation of the microgrid, it can be divided into two modes, which are operated separately and connected to the grid. These two modes of operation can effectively solve the pressure of power consumption during peak hours and play a role of peak clipping and valley filling for the entire power grid. At the same time, the energy generated by electricity in the microgrid mainly comes from new environmentally friendly energy sources such as wind energy and light energy and renewable energy. The microgrid concept was proposed by Professor RHLasserter of the University of Wisconsin in 2001, and the microgrid was defined at major international conferences. The microgrid is a new network system consisting of micro-sources, storage devices, monitoring equipment, loads, and security devices. It is also an automated system that can self-repair, self-monitor, and protect management. In current transportation, not only can it operate independently, but it can also be connected to an external grid system for grid operation. An important function of power electronics in a microgrid is to provide power, energy and control of the system to the microgrid. In order to improve the comprehensive utilization rate of energy, the microgrid adopts wind power generation, photovoltaic power generation, and fuel cells. The large fluctuations of these new energy sources affect the stability of the microgrid system. In order to solve the problem of fluctuations in wind power and photovoltaic power generation, this paper has carried out detailed analysis. At the same time, it also studies the role of energy storage devices in the microgrid, and analyzes its role in solving wind power, photovoltaic fluctuations and gaps. Compared with traditional electric energy sources, the new energy used in the microgrid can carry out long-distance and high-efficiency current transmission without the need to build a large-scale power grid system. Not only does it save investment in the construction of the power grid system, but it also has an increase in functionality. Due to the transitional exploitation of energy in economic development, the ore energy has become increasingly exhausted, which has aggravated the energy crisis. Therefore, China is now developing new energy sources. In particular, China is currently in a period of social and economic transformation. The development of clean and renewable energy has become a key project for China's development. Therefore, three different types of power generation units, such as wind power, photovoltaic and energy storage, used in the microgrid can continuously promote the development of China's power grid system. Therefore, it is necessary to analyze and study its volatility. 60Hz Diesel Generator,Diesel Generator,Diesel Genset,Diesel Generator Set Shanghai Kosta Electric Co., Ltd. , https://www.generatorkosta.com
Compared with the traditional large power grid, the microgrid is one of the sub-concepts. It is a steerable unit that can give external power transmission response in a very short time to meet the requirements of transmission and distribution. At the same time, the load, micro power supply, that is, the distributed power supply in the micro power grid, the common ones are wind power generation, photovoltaic power generation and the like. The micro-electric network is composed of a certain amount of distributed power supply according to the relevant power carrying load, and controls the entire micro-electric network through static switches during operation. Vigorously developing and using micro-electric systems can not only connect distributed power sources with new energy sources, but also realize the reuse of power load energy and improve the power supply of power companies. The reliable supply of multiple energy sources is an effective means of power system reform and a necessary stage for traditional power grids to the microgrid. The microgrid has a very broad development prospect. The microgrid can not only adjust and control under the large grid system, but also smoothly connect into the large grid system, and can realize the unified operation of electric energy and voltage in its interior. In addition, the microgrid itself has a small scale and a relatively dispersed system. Therefore, using advanced technology and adopting new energy sources for power production will help improve construction efficiency, reduce production cycle, save production costs, and meet power consumption. Supply demand. At the same time, the microgrid directly connects the energy storage equipment and the power supply to the user side, which reduces the occupied area of ​​the transmission corridor.
China's understanding of the concept of micro-grid is relatively late, and research is only in its infancy. Therefore, in the study of new energy, China has placed micro-grid construction in an important position and has established many research institutes in China. The hospital has caused research on this issue by relevant departments. At present, the microgrid has been able to meet the user's demand for electrical energy, and also ensure the safety of power supply, improve the utilization of energy, and reduce the environmental pollution caused by energy generation. The internal power supply of the microgrid is distributed. Compared with the traditional centralized power supply, it not only greatly reduces the charge pressure of the large power grid, but also improves the reliability of the power grid. In the power supply area, the power network and the user end are closely connected, and various schemes such as power generation, heating, and the like are implemented. However, there are still some shortcomings in the use of new energy sources such as wind power and photovoltaic. Among them, the volatility and intermittent characteristics of power generation affect the stability of the power grid system and cannot provide sufficient power supply to users. Inconvenience caused by electricity production in life.
The microgrid system parallels modern devices such as wind power, photovoltaics, and energy storage, which not only improves the safety and reliability of electric energy production, but also meets the high requirements for power quality in life and production. The many advantages of modern power production technology can make up for the shortcomings of existing power grid systems. However, wind power, photovoltaics, and energy storage devices are also affected by natural conditions and difficult to predict control. Therefore, when using new energy technologies, we must focus on the study of fluctuations in power generation and improve the stability of the entire grid voltage. Effectively control the electrical load output value during high and low peak periods and maintain the voltage value of each load node. The article mainly analyzes the characteristics of power fluctuations of wind power, photovoltaic and energy storage devices, collects and analyzes the data of three different power generation equipments in the work operation, and studies the influence of volatility on the microgrid.
2.1 Analysis of wind power fluctuation characteristics
The most significant characteristic of wind power is volatility. Therefore, scientific research on wind power fluctuation characteristics is beneficial to the development of new energy utilization by microgrid, and it also has important significance for microgrid. The working principle of wind power engines is not the same as that of traditional generators. There are certain differences in technical structure and operation. In this paper, the research on wind power power fluctuation characteristics is mainly carried out from the following two points: a) Wind power engine is often subject to natural conditions during operation, so the output power has intermittent and volatility characteristics, which makes the engine generate electricity in power production. It will be less than the rated load; b) The structure of the wind power system is more complicated, and the wind turbine engine unit is not concentrated enough due to the influence of the natural environment. The size of the wind power capacity accepted by the power grid is mainly determined by the peaking capacity of the regional power grid system. There may be multiple wind farms in areas with good wind conditions, and each wind farm is equipped with ten or hundreds of wind turbines, but the capacity of wind turbines is small. Therefore, in order to increase the power of wind power generation, wind farms in the same region will choose to be dispersed, and the scope is relatively wide. However, the dispersed wind farm is not conducive to the management of power companies, reducing the safety and stability of the operation of the grid system. Therefore, when improving the fluctuation of the wind power system, sufficient rotating equipment should be reserved in the construction to adjust the fluctuation power of the entire power grid system.
At present, China's energy power generation, wind power engine units are widely used, and there are also applications in thermal power generation. Thermal power generation has a large proportion of overall power capacity production in China. However, due to its large pollution, weak regulation ability of the generator set and slow regulation of wind power, the power generation efficiency is greatly affected. Therefore, improving the volatility of power generation is necessary to improve the working efficiency of the wind turbine engine.
2.2 Analysis of photovoltaic power fluctuation characteristics
The second type of microgrid new energy is to use photovoltaics to generate electricity. Its characteristics are similar to those of wind power generation, and they are characterized by spacing and volatility. Since photovoltaic power generation also has power fluctuations, the photovoltaic system will fluctuate greatly when the power is output, which has a great impact on the microgrid, and also brings inconvenience to the regulation and management of the power grid. For example, in a photovoltaic system, there is a large fluctuation in power due to photovoltaic power output, which causes the entire power grid management equipment to frequently adjust the power. Excessive actions greatly reduce the safety performance of the microgrid system, and also affect the economic benefits of power companies due to large voltage fluctuations. Therefore, improving the stability of photovoltaic power generation is an important guarantee for the rational planning of microgrids.
The analysis of photovoltaic power fluctuation characteristics is beneficial to the dispatching department in the grid enterprises to reasonably coordinate the arrangement between the traditional power supply and the photovoltaic power generation. By analyzing the output power time domain, the entire power dispatch can be coordinated in a timely manner to make the power system more standardized during operation. This greatly reduces the negative impact of the photovoltaic power generation system on the normal operation of the power grid after accessing the microgrid, and effectively improves the safety and stability of the grid operation. Photovoltaic systems make full use of solar energy and other renewable energy sources to generate electricity, which not only reduces system operating costs, but also reduces the scale of traditional power system equipment, and can also promote the rapid development of power companies and improve the economic efficiency of enterprises.
2.3 Analysis of energy storage pulsation characteristics
The energy storage device can release the dynamic energy in time to make up for the short interval and large fluctuation of wind power and photovoltaic power generation, so it plays a vital role for the whole microgrid. At the same time, through the dispatching of the power generation side or the power side, the partial load during the load period of the peak power period is arranged into the low valley load period, so as to reduce the peak load of the system, increase the valley load of the system, and increase the load rate, and effectively The intermittent power load rate is controlled. It not only plays a role in peaking and filling the valley of the microgrid system, but also strengthens the stability and safety of the entire transmission system. In addition, the selection of appropriate energy storage equipment in the microgrid transmission system can also enhance the power of wind power generation, effectively improve the penetration function of the entire wind power equipment at low load voltage, and increase the limit value of penetration power. Improve the economic efficiency of power companies while optimizing power quality.
The energy storage equipment is put into the micro grid for use, which effectively alleviates the volatility and intermittent pressure on the power output, keeps the voltage value stable, reduces the difference between the high and low peak power consumption, and effectively generates electricity. Side and power side management. In the process of use, it can be connected in parallel with other power generation devices, which not only has the effect of safe production, but also reduces production costs and guarantees social and economic benefits. In addition, vigorous development of renewable clean energy will help alleviate the pressure of ore energy demand and improve the stability of the entire system from production to output. The fluctuation of energy storage power is an extremely important part of the microgrid system. It is not only scientific and reasonable to adjust the output power of the grid, but also an important method to make up for the fluctuation of power supply.