Summary
Wind energy is a kind of green renewable energy that is widely used at home and abroad. In recent years, my country's wind power industry has developed very rapidly. Then, more and more wind power systems are built and connected to the grid. The electric energy generated by wind power is greatly affected by external factors, and has certain randomness and volatility, which has a huge impact on the stability of the grid-connected power system. Then building an energy storage system for wind power plants is the best solution to improve this situation. Therefore, in recent years, the equipment and capacity configuration of wind farm energy storage devices and the topology research of wind farm power collection system considering the 3D seabed environment have become the focus of research and application demonstration.
Due to the improvement of domestic people's living standards, continuous advancement of science and technology, and continuous improvement of control, the consumption of non-renewable energy is serious, or even exhausted, thus promoting renewable energy to become the industry leader. Wind power has become a beautiful landscape at this stage. Due to its mature development technology, relatively low cost and almost no pollution, it has a high prospect in the new energy power generation industry and has become the focus of attention of countries all over the world. At the same time, due to the strong variability, randomness and uncontrollability of wind direction, the grid connection of wind power generation has a great impact on voltage stability and electrical performance. The wind power industry is constantly innovating, and the number of grid connections is increasing. Therefore, the new generation of us must seriously study the impact of wind power grid integration.
Due to the high cost and relatively short service life of energy storage batteries, it is often necessary to configure a small energy storage capacity to smooth the active output of wind farms, which also brings challenges to the control of the battery system. In this paper, taking a medium-sized actual wind farm as an example, the control strategy in the combined operation of wind storage is studied, focusing on the control strategy of using lithium-ion battery energy storage system to suppress the output fluctuation of double-fed wind turbine wind farm, and at the same time realize the control strategy of power generation. The virtual inertia compensation strategy for the transient support of the system, and the reactive power compensation strategy for grid-connected points that are smoothly synchronized with active power.
Key words: wind power generation; doubly-fed asynchronous generator; energy storage system; grid-connected
Abstract
Wind energy is a kind of green renewable energy widely used at home and abroad.Then, more and more wind power generation systems are built and connected to the grid. The electricity generated by wind power generation is greatly affected by external factors and has certain randomness and volatility, which has a great impact on the stability of the power system after being connected to the grid.The best way to improve the situation is to build energy storage systems for wind farms.Therefore, in recent years, the equipment, capacity configuration and joint operation control of wind farm energy storage devices have become the focus of research and application demonstration.
Due to the improvement of people's living standard, continuous progress of science and technology, and continuous improvement of control, the consumption of non-renewable energy is serious or even exhausted, thus promoting the renewable energy to become the leading industry.Wind power generation has become a beautiful scenery at the present stage. Due to its advantages of mature development technology, relatively small cost and almost no pollution, it has a high prospect in the new energy power generation industry and has become the focus of attention in the world.At the same time, due to the strong wind direction variability, randomness and non-controllability, grid connection of wind power generation has a great impact on voltage stability and electrical performance.The wind power industry continues to innovate and is increasingly connected to the grid.Therefore, the new generation of us should seriously study the impact of wind power grid connection.
Due to the high cost and short service life of the energy storage battery, it is often necessary to configure a small energy storage capacity to take on the active power output smoothing task of the wind farm, which also brings challenges to the control of the battery system.This article in a medium-sized actual wind field, for example, is the wind storage in operation of the joint control strategy are studied, emphatically discusses the inhibition of doubly-fed fan in lithium ion battery energy storage system, the control strategies of wind power fluctuations at the same time of power system transient support virtual inertia compensation strategy, as well as active smooth synchronization and network reactive compensation strategy.
Keywords: Wind power; Doubly-fed asynchronous generator; Energy storage system; interconnection
Chapter One Introduction
1.1 Research topic background
In the past 35 years, with the continuous advancement of science and technology, problems such as food, transportation, and communication have been well solved, and people's quality of life has been greatly improved. However, if we continue to consume a large amount of conventional fossil energy In exchange for economic growth, the sustainable development of human beings will become nonsense. Therefore, if we want to have fresh air, clean water resources, and a green living environment, we must improve the utilization rate of clean energy and use clean energy to save us. life, and improve the living environment of human beings in a real sense.
As non-renewable fuel fossil fuels are constantly being exhausted, countries around the world are over-exploiting non-renewable energy, making global climate warming, pollution continues to be serious, and endangering people's health. Nowadays, protecting the environment has become a key task in today's society, such as global temperature rise and air pollution. However, fortunately, with the continuous advancement of science and technology, wind power technology has achieved unprecedented development and improvement both in function and technology, and has gradually become an indispensable daily tool for people in today's society. Improved people's way of life.
Now my country's light and wind power technology has made unprecedented progress, the intelligence of wind power grid connection is getting better and better, and the performance is also tending to perfection. It is completely achievable to achieve the control of wind power grid connection with the current technology. With the improvement of foreign wind power grid-connected performance, and high cost performance, it does not need to spend a lot of money. With the development of control technology and the innovation of wind power generation technology, wind power grid connection is becoming more and more intelligent. It is the development direction of today's society to gradually realize the intelligence of grid connection control system, leading the new course of wind power generation.
1.2 Current status of subject research
1.2.1 Current situation and trend of wind power generation
The wind's energy comes from the Earth's locally heated sun, which makes temperature and heat uneven in different parts of the planet, causing air currents. The use of wind power will not produce air pollutants, and the construction of new wind power plants will not pollute the atmosphere and protect people's physical and mental health. Among the renewable energy sources, wind energy is undoubtedly the most popular. It has many advantages such as excellent foundation, high cost performance, continuous resources, green and pollution-free, making wind energy one of the energy sources most likely to be developed and utilized on a large scale in the future. one. There is wind all over the world, so wind energy resources are everywhere. At the same time, there are many areas that meet the wind speed requirements of wind power generation, and it is relatively easy to develop. All that needs to be done is to build wind farms, install wind turbines, and connect them to the grid. Therefore, from an economic point of view, the acquisition cost of wind power is relatively low. Building a new wind farm does not take long, requires relatively few materials compared to other power generation facilities, and is almost non-polluting. The construction of a new wind power plant requires steps such as construction, layout, and power generation, and it can be put into use in less than a year. Figure 1.1 The development of global wind turbines in recent years.
Figure 1.1: Development of global wind turbines in recent years
For some large-scale wind power markets, 2015 is undoubtedly a big year of development. Wind power technology is developing rapidly, and many key technologies have also been broken through. Due to the innovation of control technology, the quality of wind power is getting higher and higher. The efficiency is getting higher and higher, and it has gradually become a mainstream and stable renewable energy source, and there is no big problem with grid connection. The cost of wind power is also gradually decreasing, and at this stage it is almost the same as the price of commercial electricity. Figures 1.3 and 1.4 respectively show the ranking and capacity of wind power generation in 2015.
Figure 1.2: Ranking of wind power generation in 2015
Figure 1.3: my country's wind power generator capacity from 2005 to 2015
1.2.2 Research status of wind power grid connection
In recent years, experts from all over the world are actively researching solutions to problems related to wind power grid integration. At present, the main difficulties that need to be solved are as follows:
(1) Impact on grid frequency
With the use of wind energy in grid connection, the output power of wind energy varies greatly, causing fluctuations in the national grid.
(2) Impact on power quality
Wind power grid connection also has a certain impact on power quality.
(3) Impact on power generation plan
Common power generation schemes are designed depending on the demand of loads. Due to wind energy fluctuations and insufficient forecasting, compared with traditional energy sources, wind energy stability factors seriously affect power generation plans. In large-scale wind power grid integration, the power of the grid is not enough to balance the load and charge fluctuations of wind power grid integration, which is limited, which seriously affects the design and formulation of power generation plans.
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