TAILIEUCHUNG - Electrical Generation and Distribution Systems and Power Quality Disturbances Part 2

Tham khảo tài liệu 'electrical generation and distribution systems and power quality disturbances part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Integration of Hybrid Distributed Generation Units in Power Grid 7 Requirements on voltage frequency As the system voltage waveform is generated by the interface converter its frequency can be set by acting on the frequency of the reference voltage and current in the voltage regulator and if present in the current regulator . As for the voltage regulation in stand-alone microgrids several control techniques can be adopted to maintain the frequency of the supply in the range required for the power quality with or without communication between paralleled generation units. The only difference from voltage regulation is that the control system of each generation units measure the same electrical frequency in every node of the system. To maintain the nominal frequency of the supply the control actions of each interface converter must be coordinated through a signal coming from a higher level control system if a communication system is present or through a correct setting of the regulation parameters of each converter if no communication is available. Overvoltages and voltage dips The electrical system of a micro hybrid plants is composed by three elements the hybrid power plant the loads and the low voltage grid converter. Usually the loads are concentrated in a small area not bigger than a medium rural village and the hybrid power plant is located as near as possible to the loads so the low voltage grid has usually a reduced extension and presents a very simple radial structure. If the interface converter and its regulator working correctly overvoltage on the low voltage grid can only be generated by faults or environmental phenomena lightening on the grid. Due to the reduced extension of the grid these events are very rare and can be reduced by carefully designing and installing the grid components. The considerations about the overvoltages can be extended also for voltage dips sags . The main cause of voltage dips on grid connected loads is the fast reclosing

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