A method and system for solving dynamic reactive power demand of receiving-end HVDC converter station
A DC converter station, dynamic technology, applied in reactive power compensation, power transmission AC network, AC network voltage adjustment, etc., can solve problems such as power grid protection action, power grid security operation threat, power grid accident occurrence, etc., to achieve strong applicability , good technical support, simple calculation effect
Active Publication Date: 2022-08-02
国网江苏省电力有限公司淮安供电分公司 +3
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Problems solved by technology
When a unipolar or bipolar blocking fault occurs in the DC, the voltage of the receiving end DC landing point rises sharply, which will trigger the protection of the filter capacitor and perform round cuts. If the voltage near the DC landing point is too high or lasts too long, it is easy to cause The protection action of the power grid causes power grid accidents, which brings great threats and challenges to the safe operation of the power grid
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[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.
[0026] The invention discloses a method for solving the dynamic reactive power demand of a receiving-end DC converter station, comprising the following steps:
[0027] Step 1: Calculate the voltage change of the receiving end DC landing point after the DC fault is blocked by scanning the traditional fault N-1;
[0028] Step 2: Calculate the total recovery time of the DC landing point voltage according to parameters such as the capacitor capacity, quantity, and protection cut-off time setting of the receiving-end DC converter station and the upper limit of the DC landing point voltage.
[0029] Step 3: Calculate the dynamic reactive power demand in the DC converter station by compari...
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The invention relates to the technical field of power system operation and control, and discloses a method and a system for solving the dynamic reactive power demand of a receiving-end DC converter station. The traditional N-1 fault scanning is used to calculate the value of the receiving-end DC landing point after the DC fault is blocked. The amount of voltage change is calculated according to the capacitor capacity, quantity, protection cut-off time setting and the upper limit demand of the DC landing point node voltage of the receiving-end DC converter station and other parameters to calculate the total recovery time of the DC landing point voltage; compare the total DC landing point voltage recovery time and The voltage recovery time demand calculates the dynamic reactive power demand of the DC converter station. Compared with the prior art, the present invention conducts the safety analysis of the receiving terminal voltage by considering the voltage recovery capability of the receiving terminal DC converter station after a fault, and reduces the harm of the potential DC fault to the receiving terminal power grid. , its calculation is simple, its applicability is strong, and it has the characteristics of inevitable convergence.
Description
technical field [0001] The invention relates to the technical field of power system operation and control, in particular to a method and a system for solving the dynamic reactive power demand of a receiving-end DC converter station. Background technique [0002] UHVDC can greatly alleviate the power situation of our unbalanced energy and load distribution. Since DC only transmits active power, its reactive power demand is only compensated near the point where the sending-side DC sends out and the receiving-side DC landing point. For the receiving end, the capacitors in the DC converter station can perform a large amount of reactive power compensation to support the large-scale transmission of DC power. When a unipolar or bipolar blocking fault occurs in the DC, the voltage of the receiving terminal DC landing point rises sharply, which will trigger the protection of the filter capacitor and perform rounds of removal. If the voltage near the DC landing point is too high or th...
Claims
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IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/36H02J3/16H02J2203/10Y02E60/60
Inventor 徐晓春戴欣陈建华王栋颜长鑫陈天华戴则梅闪鑫王毅杜磊徐陆飞熊正勇徐柳飞
Owner 国网江苏省电力有限公司淮安供电分公司