A transient stability feature preservation method for power systems with high proportion of wind power
A power system and transient stability technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of large amount of calculation, decreased prediction accuracy, and difficulty in meeting online prediction, so as to maintain the stable operation and balance of the power system. contradictory effect
Inactive Publication Date: 2022-07-05
SOUTHEAST UNIV +3
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Problems solved by technology
[0004] Traditional methods for predicting transient power angle stability based on physical mechanisms, such as time-domain simulation method and transient energy function method, have high accuracy, but due to the large amount of calculation, their timeliness is poor, and it is difficult to meet the needs of online prediction; Although some data mining-based transient stability prediction methods represented by trajectory fitting and artificial intelligence have great advantages in online prediction speed, ignoring the physical mechanism of the transient process may lead to a decrease in prediction accuracy
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[0058] like figure 1 As shown, an embodiment of the present invention provides a transient stability feature preservation method applicable to a wind power system with a high proportion of wind power, including:
[0059] Step S1: based on the classical second-order model of the synchronous generator of the power system, establish an equivalent single-machine infinity (OMIB) system model with a high proportion of wind power power system;
[0060] Step S2: Obtain the data of n synchronous generators in the system at m different times after the fault is removed through WAMS where δ i , P ei respectively represent the power angle and electromagnetic power of the i-th synchronous generator;
[0061] Step S3: fitting the established OMIB system model parameters;
[0062] Step S4: Calculate the transient stability margin of the system based on the equivalent acceleration area and deceleration surface.
[0063] In this example, the New England 39-node test system with wind power...
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The present invention proposes a transient stability feature preservation method suitable for a power system containing a high proportion of wind power for a power system containing large-scale wind power. The method firstly derives the equivalent injection current source model of the DFIG, and on this basis establishes the general form of the equivalent power-equivalent power angle curve of the equivalent single-machine infinite bus (OMIB) system with DFIG; The machine-end information collected during a period of time is projected to the equivalent power-equivalent power angle plane of the OMIB system and fitted, and the transient stability of the system is predicted by calculating the acceleration / deceleration area. This method can effectively preserve the transient stability characteristics of the power system with large-scale wind power, which is helpful for the prediction of the transient stability of the power system, and is of great significance for maintaining the stable operation of the power system.
Description
technical field [0001] The invention relates to the technical field of power system model equivalence and situational awareness, in particular to a transient stability feature preservation method suitable for a power system with a high proportion of wind power. Background technique [0002] The world energy crisis, environmental stress, and the low cost of wind power have prompted global power system planners to continuously increase the share of wind power in total system power generation. A high level of wind power penetration produces economic and environmental benefits, and at the same time, due to the high randomness of wind power and the reduction of the effective inertia of the system caused by the replacement of synchronous motors by wind power, it will also have a huge impact on the transient stability of the power system. [0003] Transient power angle instability is one of the most serious events in the power system. In the transient process after the system is s...
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IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 汤奕戴剑丰李碧君侯玉强李海峰
Owner SOUTHEAST UNIV