Simple Power System Closed-loop Control Method Based on Response Information
A power system and closed-loop control technology, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of credibility of simulation results and difficulty in obtaining accurate model parameters
Inactive Publication Date: 2016-06-29
XI AN JIAOTONG UNIV
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These methods are all based on the expected set of large disturbance accidents, the judgment of stability and the control strategy formulated depend on the closeness between the actual disturbance and the accident set, and depend on the accuracy of the system model and parameters, while the system model ( Especially the load model) and parameters (especially the regulator response parameters) are difficult to obtain accurately (the system is constantly developing), so there are credibility problems in the simulation results
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[0025] Such as figure 1 As shown, in the SMIB system, the generator adopts the classic E′ constant model, the inertia constant is 8.1818s, and the function of the speed regulator is not considered, and the normal operation is at a power angle of 34.81°. The angle and angular velocity results of each step of the simulation calculation transient process are used as the response-based measurement input of this scheme.
[0026] Such as figure 2 As shown, during normal operation, the control center collects and saves the real-time data measured by the vector measurement unit, and monitors whether there is a sudden change in the system power and whether there is a large disturbance signal.
[0027] The fault setting is that a three-phase short-circuit ground fault occurs on the L2 line, and the line is tripped in 0.15 seconds. Power mutations are detected at 0s and 0.15s respectively, and the closed-loop control system is started after the last network operation 0.15s.
[0028] ...
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The invention discloses a closed-loop control method on the basis of response information for simple power systems. The closed-loop control method includes predicting the transient stability of the simple power systems according to post-failure measured response of various power generators after the simple power systems are subjected to large disturbance, computing the required minimum generator tripping control quantities for maintaining the transient stability in real time for disturbance which can cause transient instability of the simple power systems, executing generator tripping control on the simple power systems and keeping the simple power systems to run stably; keeping the simple power systems which cannot lose the transient stability to run stably without emergency control measures. The closed-loop control method has the advantages that the response information of the power generators are measured according to vector measuring units, and the control quantities required by the systems can be computed in real time when the systems are instable; application of the emergency control measures can be omitted when the systems run stably, the systems keep running stably, and the closed-loop control method can be used for carrying out online real-time closed-loop control on the simple power systems.
Description
technical field [0001] The invention relates to a power system closed-loop control method, in particular to a simple power system closed-loop control method based on response information. Background technique [0002] The problem of transient instability control of power system is very important for power system. The earlier transient instability control of power systems mainly used a large number of off-line calculations to predict large disturbance scenarios, extracted feature quantities, and used the combination of feature quantities to reflect transient stability. For unstable scenarios, the stability control strategy is obtained through trial and error calculation, and it is inserted into the stability control strategy table. When a large disturbance occurs, according to the measured characteristic quantity, query the control strategy table to determine whether to use control and what kind of control strategy to use. In order to improve the accuracy of simulation resu...
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IPC IPC(8): H02J3/24
CPCH02J3/24Y02E60/00
Inventor 张保会王怀远杨松浩郝治国
Owner XI AN JIAOTONG UNIV