Safety and stability control system modeling method in power system dynamic simulation

Abstract

The invention relates to a safety and stability control system modeling method in power system dynamic simulation. The method comprises the following steps of: performing hierarchical modeling on the safety and stability control system in a hierarchical decomposition mode; simulating an operation mode, fault information and a control strategy by adopting a ladder logic diagram to obtain a main station model and a sub-station model; and connecting a safety and stability control system model and a primary system model to realize the close-loop dynamic simulation of a large-scale power system which contains the safety and stability control system model. By the method, various different action behaviors and control characteristics of the safety and stability control system in the large-scale power system can be simulated accurately; the defects that conventional simulation software cannot reflect the action behaviors of the safety and stability control system are overcome; postmortem analysis of complex and severe accidents can be performed; and the requirements of the large-scale power system dynamic simulation on the simulation of the safety and stability control system can be met.

Description

technical field [0001] The invention relates to a method for simulating and calculating a power system, in particular to a method for constructing a model of a safety and stability control system in dynamic simulation of a power system. Background technique [0002] With the continuous development of the power system, a huge national AC-DC interconnection grid has been formed, the static and dynamic behavior of the power system has become more complex, the system stability margin has decreased year by year, the severity of accidents has increased significantly, and even caused local The failure quickly propagated throughout the network. A series of blackouts at home and abroad in recent years are a good example. The power grid security and stability control system is an effective measure to improve system stability and maintain safe and stable operation of the power grid, and is an important line of defense to prevent system collapse in chain reaction accidents. [0003] T...

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Problems solved by technology

[0004] Generally speaking, the safety and stability control system is highly targeted, has a wide variety, and the device structure is complex, with many start-up links and lock-up links.

Therefore, a comprehensive and realistic simulation of a safety and stability control system in a large power grid is a complex topic

Scholars at home and abroad have done a lot of work on this topic, but most of them are limited to the application of the Dispatcher Training Simulator System (DTS), and the established automatic device models are often for specific applications, and are relatively universal. Moreover, due to real-time limitations, the built model is often rough, and the simulation results are quite different from the actual situation.

[0005] At present, power system analysis tools widely used at home and abroad, such as power system simulation software PSS / E, EUROSTAG and NETOMAC, although provide some simple SPS (Special Protection Systems) models, but the variety is not rich enough, and all are based on foreign The corresponding device is a prototype, which is quite different from the safety and stability control system widely used in my country's power system, and cannot reflect the control law of safety and stability control devices in my country's power system; Power System Analysis Software Package (PSASP) Although the stability program, PSD-BPA transient stability program and PSD-FDS whole-process dynamic simulation program have considered the simple low-cycle load shedding and low-voltage load shedding voltage-frequency emergency control device models, they are still a piece of cake in terms of safety and stability control systems. Blank, far from meeting the needs of dynamic simulation in the whole process of power system

[0006] In the power system dynamic simulation program, a model consistent with the action characteristics of the practical safety and stability control system device is established, which can effectively simulate the full dynamic process of the power system, accurately simulate the entire continuous dynamic process after the power system is disturbed, and solve the problem The lack of a safe and stable control system model in the existing simulation program cannot truly reflect the shortcomings of the components of the safe and stable control system

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