Safety and stability control system and method based on real-time decision-real-time control mode

Abstract

The invention provides a real-time decision-real-time control mode-based safe and stable control system ("on-line real-time stable control system" for short). The system adopts an implicit fine integration method, a lesser degree minimum active precursor node number optimization algorithm, a multi-channel set sparse vector method, generator node voltage prediction, an on-line dynamic equivalence algorithm, an ultra-real-time transient stability simulation algorithm of an early termination calculation algorithm, as well as a power vacancy line searching algorithm, and a real-time stable controldecision algorithm for system damping characteristic distinguishing, instability energy and comprehensive sensitivity; and an adaptive control strategy rapid optimization algorithm and a high-speed communication technology are adopted for different instability types, so that a safe and stable control system of a "real-time decision-real-time control" mode is realized, and accurate closed-loop self-adaptive stable control is completed according to the real-time running state and fault information of a power grid.

Description

technical field [0001] The invention designs a safety and stability control system and a control method based on a "real-time decision-making and real-time control" mode, and belongs to the technical field of power system safety and stability control. Background technique [0002] The security and stability control system is the second line of defense to ensure the safe and stable operation of the power grid, and it is implemented according to the control strategy during actual operation. According to the different technical routes adopted by the control strategy, the decision-making methods of the safety and stability control system are divided into three types: [0003] (1) Offline decision-making, real-time matching [0004] The technicians use offline simulation software (such as BPA, PSASP, etc.) to perform a large number of simulation calculations based on the expected fault set to form an offline strategy table, which is then programmed by the developers of the stabi...

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Problems solved by technology

[0009] Compared with the three decision-making methods, the "offline decision-making and real-time matching" decision-making method is the most mature technology and is widely used at present, but it still has a large amount of offline calculation, poor self-adaptation, and strong dependence on professional technical level and scheduling operation experience. There are cases of strategy mismatch or inaccuracy; the "online pre-decision, real-time matching" decision-making method can significantly improve the accuracy of the stability control strategy, reduce the probability of strategy mismatch, and reduce the workload of manual calculations. For example, if the expected fault is not completely consistent with the actual fault form and fault location, then there will be a problem of low precision of control measures. For multiple faults, cascading faults, or other situations where the operating state of the power system changes continuously and rapidly, there are still strategies The risk of mismatch; the "real-time decision-making, real-time control" decision-making method does not depend on the policy table, and there is no risk of mismatch in theory, but it has extremely high requirements for computing speed and real-time communication, and is still in the hot research stage

[0010] In the prior art, CN105656207A discloses an online real-time stability control system and control method for a power system, including a stability control device at the station end, an online decision server at the dispatch end, and a data communication interface, providing a "real-time decision-making, real-time control" The online real-time stability control system, but when the online real-time decision server judges the stability of the power system, it only performs transient stability prediction and emergency control strategy search, and does not calculate and optimize the stability control strategy for the unstable state. The error is large, and the practical application After the process is unstable, it cannot be stabilized in time

Similarly, the prior art CN103166219A discloses a power grid online stability decision-making control system and control method based on ultra-real-time simulation, and only discloses an online stability decision-making system, which regularly scans and judges weak links in the power grid based on expected fault sets, and makes preventive control decisions and emergency control decisions, generate a stability control strategy and send it to the stability control device, and send the global power grid information to the stability control device; generate a stability control strategy through the offline stability control strategy table generation module and the online stability control strategy table generation module , the stability control strategy is not optimized based on actual data, and the stability control is not accurate

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