| With the rapid development of China’s economy, more and more enterprises to establish self owned power plant, the captive power plant are often not connected with the large power grids, forming an "isolated grid". Generator frequency isolated power grid operation fluctuates greatly, and may even collapse of frequency, blackout, causing serious economic losses. Therefore, appear in the user side of large load fluctuation and generation side big fluctuations, how fast and stable solitary network, ensure the isolated grid power supply quality, to protect the equipment and products from great loss has important significance. In view of the above problems, this paper makes a thorough analysis and study of simulation.In the enterprise owned power plant, aiming at different downstream electricity load, often with load fluctuation changes quickly, fluctuation of strong randomness, this paper first from the downstream load characteristics, separately from the electricity generation side side and analyzes the existing problems and difficulties in the construction of the isolated net.The risk and difficulty of isolated grid face mainly has lost plant power risk, the transient stability level of power generation side load impact downside risk, make a success of life loss angle oscillation generator acceleration risk and generating units, to mainly solve the active power balance and reactive power balance, transient stability, on the problem of generating units life the impact of, in the face of these problems, according to the generation side and grid side and supply side demand, this paper designed a machine network coordination control system, machine network coordination system is to realize the core of the whole isolated grid safe operation, the coordinating control of generation side electricity output and lateral load, the realization of AGC/AVC, stability control life optimization of unit system, and other functions, to ensure the electrical side of the transient stability, optimal power flow distribution and equipment safety, ensure the whole system of active and reactive power dynamic stability, so that the safe and stable running of grid. |
