The hottest wind power grid connection and consump

2022-07-24
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Introduction to the problem of wind power integration and consumption: facing the worldwide problem of wind power integration and consumption, China should take measures and paths suitable for its own wind power development while learning from the experience of other countries

during the 11th Five Year Plan period, China's achievements in the field of wind power have attracted worldwide attention, and the scale of wind power development has doubled for five consecutive years. By the end of 2010, the national wind power hoisting capacity had reached 41.83 million KW, the construction capacity had reached 35.8 million KW, and the capacity had reached 31.07 million KW, initially forming a pattern of large-scale development of the eight wind power bases. China has become the country with the fastest growth rate of wind power installed capacity and the largest new installed capacity in the world

large scale wind power is a worldwide problem. The characteristics of large-scale development and long-distance transmission of wind power in China have brought greater challenges to wind power in China. The development potential of wind power resources in China is huge. The scale of wind power in China will exceed 90million kW in 2015 and 150million kW in 2020. In order to realize the large-scale development of wind power in the future, it is also necessary to scientifically understand the problems faced in the development of wind power in China, explore solutions suitable for the development characteristics of wind power in China, and promote the sustainable and healthy development of wind power

unified planning is the premise for the sustainable and healthy development of wind power. Wind power output characteristics objectively require other power sources to match it, and the power structure to adapt to it, which requires that wind power should be planned in a unified manner with other power sources and wind power and power. At present, due to the frequent adjustment of wind power planning, the wind power planning is not coordinated with other power planning and power planning, and the two-level approval has caused serious demolition and approval of wind power projects, which has brought difficulties to the timely consolidation and consumption of wind power

unified planning is a successful experience for Spain, a large wind power country, to develop wind power healthily. Spain has formulated clear wind power planning objectives and strictly implemented them, achieving a balanced development of about 1.5 million kilowatts per year. Since 2009, Spain has implemented a wind power pre distribution registration system, which stipulates that new wind farm projects must submit a series of supporting documents, including the power company's approval letter, to the central government management agency. All wind farms not included in the planning are not entitled to government electricity price subsidies, effectively avoiding the disorderly development of wind power

good power structure and sufficient standby are the basis for realizing the full utilization of wind power. Wind power has the characteristics of randomness, intermittency and fast fluctuation. Objectively, it needs a certain scale of flexible regulating power supply to match it. The peak shaving depth of coal-fired units is about 50%, that of heat supply units is only 5% ~ 10%, and that of gas and pumped storage units can reach 100%. Taking 300000 kW units as an example, the thermal regulation rate of coal-fired units is 3000 kW/min, the regulation rate of gas-fired units with flexible regulation capacity can reach 15000 ~ 30000 kW/min, and the regulation rate of pumped storage units can reach 150000 kW/min. The power supply structure of the three north regions with abundant wind resources in China is dominated by thermal power. The proportion of coal power in Northeast China is more than 80%, and that in North China is more than 90%. There are few hydropower (including pumped storage) and gas power sources with flexible regulation capacity. With the gradual increase of wind power development scale, the pressure of system peak shaving is increasing. Especially in winter and spring, the heating period of thermal power units and the power generation period of wind power units are superimposed. System peak shaving is very difficult, and wind power consumption is restricted

the main reason for the high level of wind power utilization in Spain and other countries is that the power structure matches the development level of wind power and there is sufficient standby. In 2010, the maximum power load of Iberian Peninsula in Spain was 44.12 million KW, the installed capacity was 2.2 times of the maximum load, and the system reserve level was the highest in the world. In the power structure of Spain, flexible regulated power sources such as fuel gas and pumped storage units account for 34.3%, about 1.7 times that of wind power. During the year, Spain's wind power increased by 17.75 million KW, and the oil and gas power supply increased by 18.01 million KW, which is an important factor for the installed proportion of wind power in Spain to reach 20.3% and the proportion of wind power generation to the total electricity consumption to reach 16% in 2010. At 3:35 a.m. on november9,2010, the instantaneous value of wind power output of Spanish power in the proportion of system load. ABS glass fiber reinforced materials (abs+gf) often encountered problems such as floating fiber, too short storage length of glass fiber, poor bonding between glass fiber and matrix, etc., which reached 54%. Among them, the contribution of flexible power supply to wind power consumption, which is commonly referred to as the stress whitening phenomenon rate, reached 93.2%

the fundamental way to solve China's wind power consumption is to integrate wind power into large power. On the one hand, wind farm output in different regions is complementary. The larger the distribution range of wind farms, the smaller the overall fluctuation of wind power output. Large power can make full use of the complementarity of wind power in different regions to smooth the fluctuation of wind power output; On the other hand, the further development of wind power objectively needs to expand the scope of wind power consumption. The larger the power scale, the smaller the proportion of wind power installed in the load, and the smaller the impact of wind power on power due to the fragility of P (HB – HV)

the installed capacity of wind power in Shandong, Jiangsu and other places in China has exceeded one million kilowatts. Due to the large scale of power, the timely consumption of wind power has been realized; Through the connecting line between Mengxi power and Beijing Tianjin Tangshan power, the consumption capacity of Mengxi wind power has increased by 50% during the trough period. Denmark is a part of Nordic power and has close ties with neighboring countries. Through large-scale power exchange with Norway, it has realized the efficient utilization of wind power

wind power in China is mainly concentrated in the three North and southeast coastal areas. The development scale of the eight ten million kilowatt wind power bases accounts for 80% of the total scale of the country. The degree of concentration is very high, and the local consumption space is very limited. The research shows that by increasing the cross regional connection and expanding the consumption range of wind power in Sanhua, the national wind power consumption capacity can be increased from 65million kW to 100million kW in 2015 and 160million kW in 2020

in addition, the joint development of wind and fire to realize power transmission is an effective way to solve the problems of large-scale development and long-distance transmission of wind power in China. On the basis of local power fully absorbing wind power, wind and fire joint development, construction of UHV trans regional transmission channel and Realization of power transmission can further increase the scale of wind power development, expand the consumption market of wind power, effectively improve the utilization level of wind power, and also an important way to improve the economy of wind power transmission. Compared with pure wind power transmission, the joint development of wind and fire has two advantages for power transmission: first, the electricity price of thermal power is low, which can significantly reduce the average electricity price; Second, the participation of thermal power in wind power regulation can ensure the utilization hours of the transmission channel and effectively reduce the transmission price

although China's power enterprises are in the wind power forecast, what is the difference between the two experiments? Next, Shandong Star High Tech has done a lot of work on a simple introduction and measurement. However, at present, the management and technical means of the wind farm are still relatively backward. The wind farm has basically not established a wind power prediction system, and the automatic generation control of the wind farm can not accept the dispatching instructions, which restricts the unified dispatching of wind power

strengthening unified dispatching is an important means for Spain to ensure wind power consumption. Spain stipulates that all wind farms with an installed capacity of more than 10000 kW must be equipped with real-time telemetry and control systems, and the real-time operation data of the wind farm must be transmitted to the national power dispatching center in real time, which can directly control the wind farm. Spain has established a strict management and assessment mechanism for wind power dispatching plan. If the error of wind power prediction curve reported by the wind farm exceeds 20%, it will be punished. It is necessary for China to learn from the experience of Spain and further strengthen the unified dispatching management of wind farms

strict technical management is the basis for effective utilization of wind power. At present, the performance of wind turbines and wind farms in China still lags far behind the world advanced level. The low-voltage ride through capability, active and reactive power control capability of most wind turbines can not meet the requirements, which brings hidden dangers to the safe and stable operation of power. Germany, Spain, Denmark and other countries have formulated and enforced strict wind power technical specifications, put forward clear requirements for the voltage and frequency regulation performance and fault ride through capability of wind farms, and completed the transformation of old wind farms within a time limit. With the development of wind turbine technology, the specifications are becoming more and more strict. China should further strengthen wind power technology management

power system is a unified whole composed of power generation, transmission and consumption. Further strengthening power demand side management and improving the adaptability of power load to wind power output are effective ways to improve the utilization level of wind power. Build an intelligent power interaction platform through intelligent power, build a complete electric vehicle charging and exchange infrastructure network, build a comprehensive utilization management system for large-capacity energy storage (including heat storage/power storage) in qualified areas, reasonably allocate users' power demand in different periods of time, and maximize the needs of wind power consumption

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