Practical Research On Power Flow

In electric power network computing, it is always necessary to perform a power flow on a given operating mode, whether it is an off-line calculation or an online one. Therefore, it requires different power flow in different fields.In engineering practices, the power flow is required to not only take up small memory and have reliable convergence, but also compute fast. First, the thesis compares the memory overhead of two different types of storage, arrays and linked list, on the basis of the sparse technology. Second, it compares the speed of operation of this two types of storage. Last, it comes to the conclusion that it is the array storage which has certain advantages. Meanwhile, in Dispatching Automation, the power network structure is almost unchanged, which provides facility for the use of an array.As the modern electric power industry is developing to have large-scale system, the ultrahigh voltage, the long-distance range and the large capacity, the electric power network architecture is getting more and more complex. Therefore, more researches need to be done on power flow calculation, especially in the scientific research, where further improvements on the original power flow procedure need to be made. The power flow in scientific research requires a power flow procedure easy to maintain and revise, and therefore the thesis designs an algorithm of Newton power flow for study purpose. When this algorithm is used to design a procedure, the operating speed is reduced a little, but it brings greater convenience to the maintenance and the readability of the procedure. This algorithm uses traditional power flow calculation instead of the sparse technology, and analyses the admittance matrix in culculating process, and then deal with Jacobi matrix. Using this algorithm can reduce the number of operation and get rid of unnecessary calculations. As a result, it makes great progress in speed compared with the traditional power flow.Power flow of power system is a basic tool of designing and analysing the power system. There are a variety of reasons for the convergence in power flow because of the complication of power network. The thesis analyses the reasons from the several aspects of the power flow, which are building the network model, the voltage vector initialization, listing, initializing, solving the power flow equation and correcting voltage vector. In the end, the thesis designs the expert power flow.