System and method for determining transient overvoltage of sending end of multi-direct-current sending-out system
A transient overvoltage, multi-DC technology, applied in electrical components, power transmission AC networks, emergency protection circuit devices, etc., can solve problems such as lack of theoretical calculation methods
Active Publication Date: 2020-06-30
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology
[0004] For the transient overvoltage problem at the sending end caused by the large-capacity UHV DC power disturbance, especially for the system sent through multiple DC circuits, the current engineering mainly adopts the method of simulation analysis to calculate the transient voltage rise, and there is a lack of effective theoretical calculation methods
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[0033] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar promotions without violating the connotation of the present application. Therefore, the present application is not limited by the specific implementation disclosed below.
[0034] This application provides a system for determining the transient overvoltage at the sending end of a multi-DC sending system, such as figure 1 shown, including:
[0035] The parameter acquisition module is used to obtain the active power and reactive power of each DC in the multi-DC sending system, the port AC voltage of each DC, the self-impedance of each DC, and the mutual impedance between any two DC nodes;
[0036] The transient overvoltage calculation module is used to calculate the transient voltage ris...
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The invention discloses a system for determining transient overvoltage of a sending end of a multi-direct-current sending-out system, and the system comprises: a parameter obtaining module which is used for obtaining the active power and reactive power of each direct current of the multi-direct-current sending-out system, the port alternating-current voltage of each direct current, the self impedance of each direct current, and the mutual impedance between any two direct-current nodes; a transient overvoltage calculation module which is used for calculating the transient voltage rise of each DC sending end according to the parameters acquired by the parameter acquisition module and determining the transient overvoltage of each direct-current sending end according to the transient voltage rise and the port alternating-current voltage. The demand problem of a theoretical calculation method for the transient overvoltage of the sending ends of the multi-direct-current sending-out system issolved.
Description
technical field [0001] The present application relates to the field of power system operation control, in particular to a system and method for determining the transient overvoltage at the sending end of a multi-DC sending system. Background technique [0002] my country's wind and light resources are mainly concentrated in the Three North regions, and the load centers are concentrated in East China and Central China. The distance between the wind and light energy bases and the load center is between 800 kilometers and 3,000 kilometers. UHV DC transmission has the capability of point-to-point, ultra-long-distance, and large-capacity power transmission. When wind power is transmitted alone, its uncertainty will bring risks to the safe and stable operation of the power grid, and the transmission channel cannot be fully utilized, resulting in poor economy; it is ideal to use wind power and nearby thermal power to "bundle" and send it out transmission mode. [0003] In the act...
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IPC IPC(8): H02J3/36H02J3/48H02J3/50H02H7/26
CPCH02J3/36H02J3/48H02J3/50H02H7/268Y02E60/60Y02E10/76
Inventor 王铁柱马士聪赵兵曾思成张曦郭剑波柯贤波霍超张钢王吉利韩悌张振宇牛拴保程林魏平任冲
Owner CHINA ELECTRIC POWER RES INST