An emergency power support method for DC systems based on generalized dynamics
A DC system, power support technology, applied in the direction of power transmission AC network, electrical components, etc.
Active Publication Date: 2015-11-04
STATE GRID CORP OF CHINA +2
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Problems solved by technology
However, factors such as the time and quantity of emergency power support play a decisive role in the support effect, how to determine the appropriate amount of power support in real time needs to be further studied
Method used
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[0058] Such as figure 1 As shown, the specific method flow of a DC system emergency power support method based on the generalized dynamics principle of the present invention is as follows:
[0059] Step 1: When the control method of the present invention is started, obtain the inertia center power angle of the AC and DC systems at both ends when the AC and DC systems are in normal operation before the disturbance occurs, and simultaneously set the variable n to zero and the flag variable h to zero, and turn to step 2. The variable n is used for counting, and the flag variable h is used to indicate whether the power reduction is started, h=0 indicates that the power reduction has not yet started, and h=1 indicates that the power reduction has started. The control method is triggered by a disturbance signal or manually.
[0060] Step 2: Get t 0 Establish the generalized dynamic model of the AC-DC system at this moment, and turn to step 3.
[0061] Step 3: Let n=n+1,t n = t ...
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The invention relates to a direct current system emergency power support method based on the general principle of dynamics. The method includes the steps of step 1, initialization, specifically, obtaining relevant parameters at t0 moment and establishing a general dynamical model of an alternating current / direct current system at the moment, step 2, establishing a general dynamical model of the alternating current / direct current system at the moment by utilizing tn moment parameters of an alternating current system, step 3, judging system states at the tn moment, step 4, computing relevant parameters at the tn moment, and step 5, computing the direct-current power support amount under a swing state. According to the direct current system emergency power support method, through information of power angles, voltage, power and the like of the alternating current / direct current system after disturbance, the proper direct current emergency power support quantity is computed in real time, therefore, a direct-current high-voltage transmission system is controlled to carry out emergency power support for the alternating current system, and transient stability of the alternating current / direct current system after the disturbance is improved. Compared with a conventional direct current emergency power support method, the direct current system emergency power support method does not need a failure assembly control pre-arranged plan and has better adaptability.
Description
technical field [0001] The invention relates to an operation control method of an AC-DC power system, in particular to an emergency power support method for a high-voltage DC power transmission system based on generalized dynamics principles. Background technique [0002] In recent years, benefiting from the rapid development of power electronics technology, control theory and computer technology, high-voltage direct current transmission (HVDC) technology has become increasingly mature, the cost of direct current transmission has been continuously reduced, and the operational reliability has been gradually improved. [0003] The HVDC transmission system has the characteristics of flexible control and fast adjustment speed. Studies have shown that the HVDC transmission system has the ability of emergency power support, and compared with the emergency control measures of the AC system, using the emergency power support of the DC system to improve The stability of the AC-DC sys...
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IPC IPC(8): H02J5/00H02J3/36
CPCY02E60/60
Inventor 刘建涛王珂冯树海徐鹏李亚平曾丹毛文博周竞
Owner STATE GRID CORP OF CHINA