Large Capacity Wind Power Access By The Adaptability Of The End Grid

With economic development, modern society’s increasing demand for energy, in order to ensure energy security, diversify energy sources and climate change, the need to actively develop renewable energy sources. Wind energy is inexhaustible, clean, non-polluting, renewable energy, in the current development and utilization of new energy to occupy a dominant position and priorities. At present, China’s wind power generation is in a stage of rapid development, many have been built or are building million kilowatts of wind power base are at the end of the grid, grid structure is not strong enough, the power structure is a single, large-scale wind power access to these areas stable operation of power has brought a lot of pressure, while the volatility of the wind power output of wind farms are volatile, with the expansion of wind farms, wind power capacity in the increasingly high proportion of the grid, and its impact on the grid range from the local gradually expanded. Wind power capacity long-range transport network is also the trend of the entire system, transient stability and frequency stability will have an impact. Therefore, further strengthen power grid construction and planning, operation scheduling method to achieve new breakthroughs in the development of wind power and the use of great significance.Currently, for the wind power system after the impact, many scholars have conducted a lot of in-depth analysis and research, including the system power flow problem, power quality problems, transient stability, voltage stability and frequency stability issues. And after a run for the wind power access scheduling, economy, reliability and other aspects of the research is relatively small. Access to in-depth study of wind power on the grid effect, rich sound of wind power capacity by the end of the grid after access adaptive research, this paper mainly from the following aspects for large-capacity wind power grid access technical problems analysis:1. for wind power output forecasts, the existing load forecasting based on the results, determine the corresponding changes in wind power output random regularity. This generation has been introduced to the planning process, including the configuration of power generation from alternative aspects from research on the grid connected wind power generation plan development impact. Shandong Yantai area, for example, carried out wind speed and wind power output of the short-term forecasts, and analyzes of wind power after the Shandong power grid connected power generation planning problems. Prediction using neural network structure and methods to predict the wind speed, and can achieve more satisfactory prediction accuracy; simulation shows that, for the same level of reliability as to improve the access of wind power capacity, the system’s operating costs will decrease gradually; wind farm Yantai run on electricity generation system adequacy will not have a significant impact, with the installed capacity of wind power Yantai area increases, the system requires a corresponding increase in spare capacity. Because wind farm output fluctuations, wind farms set spare capacity of about wind farm installed capacity of10%to12%.2. wind power access fees can be avoided mainly reflected in fuel savings and reduction of environmental pollution, to meet the system reliability requirements of the premise, you need to analyze separately calculated and access when there is no wind farm wind farm operation of the system after the two aspects costs and emissions. For both cases, analysis and comparison of the cost of wind power can be obtained when the access after the thermal power units can save production costs and pollutant emissions costs. In this paper, stochastic simulation method to calculate the production of wind power grid after access Yantai costs can be avoided, by imposing or increasing emissions of fossil fuel power plants can be improved to avoid tax costs, increase wind farm in the electricity market competitiveness. Based on reliability analysis models and algorithms for various modes of operation reliability analysis, in wind power generation costs by increasing the reliability of the system, namely through additional spinning reserve certain capacity of wind power output in response to random fluctuations, maintaining system the power balance and stability.3. in order to ensure the reliability of the whole system should take into consideration economic and reliability of the number of fans and other indicators rational decisions, we use non-sequential Monte Carlo simulation analysis of wind integration on the impact of Shandong power grid reliability. Simulation results show that the system more vulnerable to the original bus, wind power access can significantly reduce the probability of loss of load bus and expectations of loss of load capacity, reducing power loss risk, improve power supply reliability; relatively strong for the original system bus, wind power access has little effect on its reliability, access to the bus before and after class and expectations of loss of load probability of loss of load were not changed significantly; for part of the original system bus voltage110kV and below, the wind power integration could lead to loss of power increased risk. However, the voltage level of grid operation mode for the closed loop design, open-loop operation, so the reliability of wind power connected after it was not obvious.