A flexible DC control method and device for improving power grid transient stability
A flexible DC and power grid transient technology, applied in the direction of power transmission AC network, reducing/preventing power oscillation, etc., can solve the problems of not fully tapping the benefits, and achieve the effect of improving transient stability and system operation safety
Active Publication Date: 2021-07-30
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
These methods mainly focus on the control of active or reactive power, and the coordination of the two is relatively simple, and the benefits brought by the coordinated control of active and reactive power are not fully exploited.
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[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0034] see figure 1 , is a schematic flowchart of a flexible DC control method for improving power grid transient stability provided by an embodiment of the present invention, the method includes steps S1 to S6:
[0035] S1. Obtain the active sensitivity and reactive sensitivity of the electromagnetic power of each generator in the electric AC system to the flexible DC output through simulation;
[0036] S2. Obtain the angular velocity variation of the real-time a...
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The invention discloses a flexible DC control method and device for improving the transient stability of a power grid. The method includes the steps of: obtaining the active sensitivity and reactive sensitivity of the electromagnetic power of each generator in the system to the flexible DC output through simulation; The angular velocity variation of each generator during actual operation; according to the active power sensitivity, reactive power sensitivity and angular velocity variation, the active power index value and the reactive power index value are obtained; judge whether the active power index value and the reactive power index value are in the dead zone, if so , keep the original control strategy unchanged; if not, when the active index value is outside the dead zone, the reactive index value is within the dead zone, or when both the active index value and the reactive index value are outside the dead zone, and the active index When the absolute value of the value is greater than or equal to the absolute value of the reactive index value, the active power control priority strategy is adopted; in other cases, the reactive power control priority strategy is adopted. The invention can exploit the advantages of flexible DC active and reactive power control, and improve the transient stability of the system.
Description
technical field [0001] The invention relates to the technical field of power system operation control, in particular to a flexible DC control method and device for improving the transient stability of a power grid. Background technique [0002] In recent years, due to flexible DC control and no risk of commutation failure, more and more flexible DC projects have been put into operation in China. In order to improve the operation safety of the large power grid, the flexible DC asynchronous interconnection between the sending end grid and the receiving end grid has attracted more and more attention from the power industry and academia at home and abroad, and a large number of corresponding flexible DC have been carried out to improve the stability of the feed-in system. Research work on sexual control methods. Flexible DC can achieve decoupling control of active power and reactive power to a large extent. In view of the characteristics of flexible DC, in addition to conventio...
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IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/24H02J3/36Y02E60/60
Inventor 陈雁
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD