The working principle of on-load automatic capacity regulating distribution transformer is elaborated in this study, a layout scheme with anti-parallel thyristor valve assembly as capacity regulating switch is designed. The thyristor valve assembly is selected. The respective character in the system of electromagnetism trigger and online monitoring as well as photoelectricity trigger and online monitoring is described. With the comparison, it takes the system of electromagnetism trigger and online monitoring at last.
An improved TS algorithm is put forward on the condition that reactive power compensation location and capacity have been identified in rural distribution lines. The Algorithm is based on capacitor optimal on-off model aimed at a minimum network loss, it can control the capacitor on-off according to the load changing and the system operation status and keep real-time voltage qualified and network loss minimum. A distributed control system is designed by using the algorithm to realize reactive power optimization, which is composed of reactive power optimal terminals and background control center. The terminal is in charge of data collection and transmission, on-off instruction receiving and executing. The control center in in charge of receiving data from every compensation point, calling control algorithm to process data, forming and sending instructions. GPRS technology is adopted to realize the system’s foreground-background communication. The actual application in some experimental networks has proved that the system can realize global optimal control for distribution lines, and is suitable to be widely used in rural distribution network.
The access of DG changes the operation and structure of traditional distribution network. This study mainly focused on controlling DG output current to reduce network loss of the system. Select a simple radial distribution system as example for theoretical analysis and derive the expressions of load current and node voltage. Assuming that there exists a real number k between DG output current and load. Then list the network loss and voltage deviation expressions. For the purpose of operation optimization, k can be determined by mathematical calculations. It proves that the method has a certain rationality to be effective in controlling network loss.
As the basis of power distribution network automation, the feeder automation plays an important role in the distribution network. The traditional feeder automation system has a long fault isolation time, the frequent switching and outgoing and then overlap power filter troubleshooting repeatedly. 10 kv feeder automation system in the thesis is controlled by the upper PC computer system and the lower machine system, and the lower machine system's intelligent controller collects the operation information of the voltage and current of the line being monitored in real time with AC-sampling technology, and through the GPRS wireless communication network will field data is passed to the remote control center. When the short circuit faults occur, the controller will immediately disconnect the switch, and the incorrect information will be sent to the remote control center, the remote control center to collect incorrect information from all the controllers, then provide the fault judgment and control strategy through relevant logic. Practices have proved that the system could improve the level and reliability of power distribution network effectively.
The maximum power tracking and Grid-connected is the urgent need to solve the problem which exists in the grid-connected PV system. This article expounds on the maximum power point tracking and grid inverter control strategy. It puts forward the control strategy of researching maximum power point tracking, which is effective in improving solar panels convert solar energy into energy. With the development of photovoltaic technology, requirements of photovoltaic grid control strategy are getting higher and higher. This article examines adaptive disturbance observed method integrated control combined BOOST boosted circuit, in order to achieve the maximum power point tracking for photovoltaic panels .The photovoltaic inverter control structure is to meet the photovoltaic conversion efficiency and power quality of the main technical indicators. It put to use double topology and feed forward decoupling control strategy, which provides protection for the flexible grid.
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