Author: A.kristoff Time: 2007-11-2512: 04: 00 Source: Paper World paper net.

On September 30th, 2003, the Goldisthal Pumped Storage Power Station with 1060MW was officially inaugurated in Thuringia, Germany. In this paper, the innovative design of generator set and its online monitoring system is summarized and commented.

Keywords: innovative design of Gold Pumped Storage Power Station

After more than six years of construction, the first pump turbine of Goldisthal Pumped Storage Power Station in Vattenfall Europe Generation (VE-G)1060 MW was put into operation on February 3, 2003.

Goldistar Power Station, located on the Schwartza River in the south of Thuringia, Germany, is one of the largest pumped storage power stations in Europe. The first two power stations, both with installed capacity of 265 MW, have been put into use and successfully delivered electricity to Vattenfall's high-voltage transmission network. At the beginning of 2004, two other variable speed units will also be put into operation. Goldisthal power station will become one of the largest and most advanced pumped storage power stations in the world.

The group responsible for the pump-turbine unit (Konsortium Goldisthal Hydropower Station) includes VA TECH Escher Wyss Co., Ltd., Voith Siemens Hydropower Station and CKD Blansko Engineering Department. Generators are provided by ARGE AEV group, including Alstom energy technology co., ltd. and VA TECH ELIN co., ltd.

The civil works include the main power plant, tunnel and upstream reservoir, and the contractor is Argepsw Goldishal Group.

The asphalt lining of the ring dam of the upper reservoir was constructed by Walo Bertschinger of Switzerland, and the asphalt lining of the main dam of the lower reservoir was completed by Strabag.

1. Innovation and cooperation

Goldisthal is the single largest hydropower design scheme newly built in Germany, at least 20 years ahead of schedule. Because it includes four generator sets with a generating capacity of 3,365,438+0 MVA, it is not only one of the most powerful devices of its kind in the world, but also has some innovations.

Automatic girth welding technology (TIG- hot wire technology) is first applied to girth welding of tunnel steel lining, which has high safety and welding quality, and its efficiency is twice that of manual welding, and it is the best method to weld high-strength QT steel. Before spot welding, all welding parameters and procedures have been displayed in the Linz factory of VA TECH Hydropower Station according to the ratio of1:1. The training of welders and the testing of welding procedures will also be carried out in the future.

VA TECH Hydro provides Goldisthal with detailed design of variable speed asynchronous generators and synchronous generators, production of moving parts, bearings, shafts and rotating parts, installation of AC coils, supervision and management of installation and operation of all equipment, and installation of DITECH tracking and diagnosis system. Larger hydropower equipment, including gates, bifurcated pipes and hydraulic steel structures of all water inlets and outlets, is provided by VA TECH Hydro and Linz, and the motors are provided by VA TECH Hydro and Vienna/Weiz of Australia.

increase efficiency

8400 tons of steel tunnel lining is produced in the temporary site factory. The culvert gate and tunnel lining total 320,000 tons, of which the temporary construction site produces160,000 tons.

One of the main advantages of this kind of motor generator is that it can significantly improve the efficiency in the mode of uniform load turbine operation (standard operation). In order to realize variable speed operation, two of the four starter generators are doubly-fed asynchronous motors with rotating furnaces.

Different from ordinary synchronous motor, its rotor is powered by three-phase alternating current, and the rotor is driven by low-frequency rotating magnetic field to change its rotation, and a set of programs is designed in a planned way to ensure efficient operation. In the operation of the pump, the output can be controlled for the stable output of the high-voltage transmission network. The rated power of these machines is 33 1MVA, the rated voltage is 18KV, and the rotating speed is 300347 (535 rpm). The other two motors are designed as traditional static excitation synchronous motors.

This kind of asynchronous motor is unique in Europe. Similar products have only been produced in Japan. Many large motors used in Europe and America are produced by VA TECH Hydro.

In Germany, VA TECH Hydro has completed the design and supply together with its partners Voith Siemens Hydro and CKD Blansk, and will complete the installation and entrust the installation of four pump turbines (including accessories). In the mechanical aspect, the innovation of pump-turbine unit design has been realized. The most remarkable design features include the design concept of guide vane running device with light speed regulating ring, finite element calculation, optimized volute design and no water pressure embedded volute. The prestressed guide vane bearing used in Goldisthal pump turbine proves that VA TECH hydropower generation technology has been developed several years ago, especially for pump turbine units.

VA TECH Hydro, as the leader of the Pump-Turbine Association, should be responsible for the basic engineering technology of the pump-turbine, providing a set of volute with seat ring, two sets of complete guide vane devices with guide vanes, upper and lower covers, two sets of runners, complete sets of tools specially built for installing the pump-turbine, and high and low pressure systems of the power station.

3. Monitoring and fault early detection

In view of the importance of maximizing output and minimizing cost, it is very important for advanced monitoring and diagnosis system to give monitoring instructions under environmental changes and conduct trend analysis and early warning outside the warning water surface. They should provide rapid diagnosis of the causes of abnormal aging and fault changes before serious damage occurs. These analysis and diagnosis results can help power plant operators, technical experts and power plant owners make wise choices, thus reducing maintenance costs and improving power generation efficiency.

The use of software and hardware is a future-oriented development and supplement according to the modern system concept, and it should also support the integration of existing monitoring components and the expansion of some users.

Early fault diagnosis, reducing irregular operation interruption and shortening repair time are the main purposes of future operation process. In addition, the long-term electronic storage of accurate results can make it easier to understand historical data, which not only has great advantages in data analysis, but also can help improve the operation of power stations. The peak energy supply indicates that the efficiency has been improved.

In order to achieve these goals, DIA TECH monitoring and diagnosis system was installed in Goldisthal Pumped Storage Power Station.

4. Online intelligent monitoring system

To some extent, DIA TECH system cooperates with international power supply utilities. Both software and hardware are developed from the technology of "Windows" operating system produced by Microsoft. Its modular structure makes it possible to enhance and supplement the special scheme of a single operator. This open system architecture allows simple synthesis of the results of the three parties.

Various diagnostic modules (known modules) can be used to identify mechanical, insulation and thermal problems, verify and monitor different operation modes (stop, start, steady state, shut down) and models (such as power generation, synchronous capacitor operation and water pump operation).

Using this online intelligent monitoring system, the state changes of main machine parts can be found earlier, and the stress can be judged more easily, thus providing basic and reliable maintenance strategies in advance. This simplifies the management of monitoring machines and improves the practicability and efficiency of the power station.

5. Climate and topography

In the dry season, the reservoir will provide 2.9 106m3 of water, and play a role in controlling and increasing floods in the rainy season. Because the water level difference between the upper and lower reservoirs is very large, the water in both reservoirs is allowed to be used.

In the field, special climatic conditions require that all installation and production must be completed in cold conditions. Many environmental laws must be strictly observed, especially the field assembly work. Close cooperation with civil contractors is also crucial to the completion of tunnel engineering.

The Upper Reservoir is located on Fadeng Kopf Mountain, which is an asphalt concrete sealed rockfill annular dam. The upper reservoir has a storage capacity of 12 106m3, which is connected with two steel pressure tunnels with a length of 920m and a diameter of 6.2m through a bell-shaped entrance and leads to the powerhouse cavern.

The main tunnel is137m long, 26m wide and 49m high. The power station consists of water pump-turbine, generator, ball valve and auxiliary equipment. Two tailrace canals with a length of 380 meters and a diameter of 8.2 meters lead to the outlet of the lower reservoir, which consists of a 67-meter-high rockfill dam on the Schwarza River and a small power generation device.

6. Environmental protection

Goldisthal project aims to develop reliable and environment-friendly hydropower energy. By building underground power stations, crops can continue to grow on the ground, and both owners and construction teams can protect the environment, thus avoiding major environmental changes. The operation of underground cavern power station will also be more economical.

In addition to providing 1060MW of energy, the power station will also bring other benefits, including regulating the primary and secondary power of the high-voltage transmission network and other standby power stations. In addition, nearly 1000 workers will be employed during the construction period, and there will be 50 permanent jobs. In addition, 80 jobs will be created for local service and maintenance departments.

The Upper Reservoir covers an area of 55 hectares, and it is planned, designed and constructed accurately, including river closure, drilling a 4.74-kilometer-long tunnel into the mountain and excavating a lot of stones. In order to avoid geological faults, the position of the main line of vortex cave has to be changed. No matter how big the project is, we should adopt a simple and easy way.

In the past, it was usually anchored with large stones, then sprayed with concrete, and reinforced bars were used to protect piers and some internal passages. About 155000m3 of excavation materials are used as rockfill for the dam. In order not to affect the landscape, the waterfront slope of the downstream main dam and the outer slope of the surrounding dam are covered with turf, and the building of the management department is built according to the local architectural style.

During the whole project, Vattenfall continuously monitored the local flora and fauna, and took active measures to prevent and correct the imbalance and damage caused by the project. In eastern Germany, in order to protect the natural environment and promote the adaptation of the environment to the project, a cooperation foundation was established with the German Association. [