Research On Several Fundamental Theory And Algorithm Of Power System Operational Security

With the rapid development of smart grid and UHV power grid, the modem grid's automation and complexity level constantly strengthen. On the other hand, The uncertainty of the system also increases, making the sweep region of fault more wider and the consequence of fault more severe. The dissertation focuses on several key theory and algorithm on power system operational security. The main achievements are as follows:In this dissertation, on the basis of the in-depth research of BATS operating characteristics, a new online algorithm for analyzing the controlling strategy of BATS is proposed. Author proposes two innovative matrix models:BATS real-time rating matrix model and BATS real-time incidence matrix model, then the physical meaning of the two-matrix model is described in detail. Making an actual regional grid of Henan province as an example, author verifyes the proposed algorithm.In order to solve this problem:a series of failures may occur due to the lack of consideration of the influence of the component thermal stability limits at standby power supply side and voltage limits of relevant bus in the controlling process of BATS. This paper evaluates the available supply capability of standby power online by using repetitive power flow method. The results provide a basis for decision making in terms of switching on the BATS. At last, author adapt the SCADA data in a region grid, and the results confirm the plausibility of our strategy.Based on the flexibility of distribution network, risk theory and starting with power supplying security of distribution network, author proposes the risk indicators of load loss, overload and voltage limit violation combining with the k(n-1+1) criterion and utility theory. Using this method, the paper gives a sub-diagnosis of the safety for system from different aspects, and makes use of Analytic Hierarchy Process (AHP) to draw the whole risk indicator of system as the foundation of the static security analysis. So we can get the integer indicator of the whole system.An integrated indices system for the regional power grid on-line security assessment is proposed. Regarding the presented indices system as the core, an approach, in which the real-time database is combined with relational database, is adopted to design the hardware structure and software architecture of the on-line security assessment system based on real-time data for regional power grid. Author also describes the specific way of how to collect and transmit SCADA and PAS real-time data from regional power grid dispatching system, and display the safety indicators.Putting forward an operational risk assessment algorithm for generating system, in which the operating conditions of generator was considered. The outage rate of generator was calculated by a method in which the operating conditions of generator had been considered. The economic loss model which was caused by unplanned shutdown of generator was also established. At last, the algorithm developed three indices, including the probability of all kinds of active power output states, active power output expectation and economic loss expectation, which can measure the real time operational risk of power plant. The calculation and analysis of IEEE-RTS79reliability test systems show that the proposed algorithm is effective.