Research Of The Power Quality On-line Monitoring Device For Digital Substation

In recent years the domestic Power Grid Corp are vigorously promoting the construction of smart grid, digital substation as an important part of smart grid construction, development is very raPId, is currently the main direction of the technology development of substation. With the popularization and application of IEC61850 standard and photoelectric transformer, merging unit, intelligent terminal intelligent equipment use, each provincial power network companies in the PIlot construction of digital substation, the country has begun to take shape in digital substation. In the promotion of the national smart grid planning, digital substation will become a mainstream mode of the future and the transformation of the new substation.Compared with the traditional power grid, due to renewable energy power generation, energy storage application of a large number of emerging technologies such as in smart power grid, resulting in smart grid power quality problems will be more complicated, only to carry out on-line monitoring normalized more widely, can timely, accurately grasp the power quality index data, security intelligence grid security, stability, economic operation. Digital substation power quality monitoring is the framework of smart grid problems to be solved.Digital substation is the new substation mode which has emerged in recent years, although the current fashion trend of development, but in China has not gained popularity and construction on a large scale, the domestic manufacturers for digital substation on new equipment manufacturing is still in a trial promotion, need to constantly perfect stage, complete with electric energy quality monitoring system is less. Real-time acquisition and display the network power quality data, and can calculate the power index, draw the corresponding waveform digital substation on-line power quality monitoring system now is a relatively new subject.This topic through the analysis of causes and effects of electrical railway power quality of electric energy quality monitoring method, research in digital substation spacing layer of establishing a power quality monitoring unit relates to a variety of technical problems, the development of effective signal processing and power quality analysis equipment conforms to the IEC61850 standard and the IED protocol, digital substation information for digital station of non conventional instrument transformer output data source, developed a set of suitable for digital substation power quality monitoring device, the system was tested and the results were compared and analyzed. Test results show that the measurement result is completely correct, and the measurement precision is high. To verify the theoretical analysis of this system is correct, the software and hardware design and implementation is reasonable, reached the design requirements.