A Dynamic Reactive Power and Voltage Enhanced Control Method for UHVDC Receiving-End Power Grid
An ultra-high voltage DC, receiving-end power grid technology, applied in the direction of AC network voltage adjustment, reactive power compensation, etc., can solve the fast reactive voltage control effect of difficult dynamic reactive power equipment, and cannot exert the fast reactive power control capability of dynamic reactive power equipment , weakening the dynamic voltage support of the power grid, etc.
Active Publication Date: 2020-10-27
STATE GRID HUNAN ELECTRIC POWER +2
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Problems solved by technology
These methods do not consider the voltage weak points of the UHVDC receiving-end grid and the voltage support effect of the actual dynamic reactive power equipment, and it is difficult to give full play to the fast reactive voltage control function of the dynamic reactive power equipment in grid faults
Therefore, the rapid reactive power control capability of dynamic reactive power equipment cannot be exerted, and the dynamic voltage support effect on the power grid is weakened
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[0048] The present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments, and the technical problems and beneficial effects solved by the technical solutions of the present invention are also described. It should be pointed out that the described embodiments are only intended to facilitate the implementation of the present invention understood without any limitation.
[0049] Such as Figure 1-2 As shown, the present invention proposes a dynamic reactive voltage enhanced control method for the UHV DC receiving-end power grid, the control method includes the following steps S1-S3:
[0050] Step S1: Based on the degree of fault voltage sag, the slip change of the induction motor on the load side, and the degree of UHV DC commutation failure, construct the evaluation basis for the transient voltage stability weak point of the UHV AC / DC receiving end grid, and determine the transient voltage stability of the UHV DC r...
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The invention discloses a dynamic reactive voltage enhancement type control method for an extra-high-voltage direct-current receiving-end power grid. The method comprises the steps of judging a grid voltage stabilization weak node by adopting a voltage stability recovery index which takes node voltage drop as a main part and takes load-side induction motor rotor stall and extra-high-voltage direct-current receiving-end system extinction angle recovery as auxiliary parts; taking the voltage stabilization weak point as a pivot node of a voltage control region, and accurately dividing the dynamicreactive equipment with an obvious voltage support effect by utilizing the dynamic impedance ratio of the voltage stabilization weak point to the dynamic reactive equipment node; and designing a dynamic reactive voltage enhancement control mode based on a power grid whole system dynamic mathematical model and a linear matrix inequality method by taking voltage information of the voltage weak nodeas a direct input quantity of voltage control for the dynamic reactive equipment. The control method provided by the invention effectively improves the direct voltage support effect of the dynamic reactive equipment on the grid voltage stabilization weak point, and has good popularization and application values.
Description
technical field [0001] The invention relates to the technical field of reactive voltage control of a high-voltage power grid, in particular to a dynamic reactive voltage control method of a UHV DC receiving-end power grid. Background technique [0002] In the prior art, the UHV DC transmission system has the advantages of large transmission capacity and long transmission distance, and it is a better way to realize the optimal allocation of resources. However, during the fault process of the UHV AC-DC grid, on the one hand, the reactive power required for recovery after the commutation failure of the UHV DC receiving-end system has increased significantly, and on the other hand, the reactive power required for the reconstruction of the load voltage has rapidly increased, resulting in The dynamic reactive power and voltage support capacity of the power grid is insufficient, and the risk of voltage instability is high. At present, dynamic reactive power equipment mainly includ...
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IPC IPC(8): H02J3/16
CPCH02J3/16Y02E40/30
Inventor 崔挺汪霄飞胡臻张焜沈阳武向萌王玎陈道君柳永妍
Owner STATE GRID HUNAN ELECTRIC POWER