Learned, formerly jiuquan jiuquan economic and technological development zone industrial park

Founded in April 2000, approved, approved by the national development and reform commission (NDRC), gansu province in 2006 the government named the first provincial key development area, this approval of classics the state council officially upgraded to a 1 state-level economic and technological development zone.

So far, the development zone area is 30 square kilometers, the total project investment of 15.69 billion yuan, in enterprise 325 households, preliminarily formed new energy equipment manufacturing, agricultural and sideline products deep processing, JianHua circular economy, biological pharmaceutical, new building materials, and other leading industries, modern logistics has developed into a facilities, supporting functions, rational layout, the industrial characteristic of provincial key development zone.

Jiuquan city government spokesman, said that the jiuquan is the national planning and construction of the first tens of mw wind turbine inverter base, million kilowatt photovoltaic base, production base of new energy equipment manufacturing industry.

In recent years, with the rapid rise of the new energy equipment manufacturing industry, jiuquan economic and technological development zone has signed with 39 Dan photoelectric equipment manufacturing leader in agreement, sinovel, goldwind, DongQi, catic HuiTeng capital holdings, sinoma science and technology, hefei, zhejiang chint, scenery electric equipment manufacturing companies such as sun.

By the end of may this year, with annual production capacity is 6 million kw wind power equipment, 500 mw battery components, production capacity of 1000 megawatts of photovoltaic inverter, become the domestic industry's largest, most product model, gathering effect the best wind power equipment manufacturing base and the northwest's largest photovoltaic module production base.

Henceforth, jiuquan economic and technological development zone will be around one hundred billion yuan of new energy and new energy equipment manufacturing industry chain and 6 ten billion yuan of industrial chain, growing industry, foster new industry cluster, argues vigorously by the end of the 12th five-year economic and technological development zone built wine jia economic core area, urban functions fusion zone and the domestic industry the largest and strongest supporting capacity, service level, the best new energy equipment manufacturing base with leading western state-level economic and technological development zone.

The convenient mobile energy storage powerstation district

Sense of fujian anxi town of enron tea with anxi no.6 middle school to the fujian electric power co., LTD electric power research institute sent a thank-you note, and thanks to its application mobile energy storage power station in anxi tea to provide reliable power supply during peak and this year the university entrance exam, brings to the tea farmers and the university entrance exam candidates electricity protection and peace of mind.

In this year's fresh tea production peak, fujian electric institute independently developed the domestic first powerful mobile energy storage device to help pilot area turned to share the one third of the power supply load, for the production of fresh tea brought the "timely rain", and anxi in no.6 middle school for the college entrance examination in the university entrance exam day electricity, more than 1000 students for the school entrance exam escort.

Problem: local time peak load

Affect the power supply reliability

They each have its characteristics,wind turbine inverter applicable occasions is different also

In order to make full use of the different power inverter  speed of wind, should to do in-depth research of variable speed constant frequency technology, to develop practical, is suitable for variable speed constant frequency of wind power inverter technology. 

3 constant speed constant frequency power inverter control 

3.1 soft start grid-connection of power inverter 

In wind turbine inverter  unit, the control system in the change of wind speed for continuous detection, when 10 minute mean wind turbine inverter speed is greater than the starting wind turbine inverter speed, the control of wind turbines to cut into the power grid all the preparation work: loosen the mechanical brakes, recover the tip damping plate, the direction of wind turbine inverter turbines in the wind. 

Control system continuously detect the sensor signal is normal, such as hydraulic system pressure is normal, whether the wind deviation, wind turbine inverter parameter is normal, etc. 

Such as 10 minutes on average grid tie inverter  is greater than the starting wind speed, whether the detection of grid tie inverter has begun turning, and open the thyristor current limit rapid start soft starting device of wind turbine, and the starting current control, which does not exceed the maximum limit. 

Asynchronous wind turbine when starting, because its speed is very small, cut into the grid when the slip is very big, so will produce equivalent generator rated current of the 5 ~ 7 times the impact of the current, not only caused great impact to power network, the current may also affect the life of the wind turbines.