On-line Calculation Method of Thevenin Equivalent Parameters of AC-DC Interconnected Grid
A Thevenin equivalent and interconnected grid technology, applied in the field of online calculation of value parameters, can solve problems such as the processing method of DC transmission branches and the judgment of AC-DC interconnected grids when identifying the Thevenin parameters of the AC side node in the AC-DC interconnected system without research, To achieve the effect of ensuring safe, reliable and stable operation
Active Publication Date: 2018-08-24
SHANDONG UNIV
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[0006] However, the existing Thevenin equivalent parameter identification methods do not judge the stability of nodes with large random fluctuations in the AC-DC interconnection grid, and the research objects of the existing Thevenin equivalent parameter identification methods are all pure AC networks, and have not studied the AC-DC interconnection. The processing method of the DC transmission branch when the Thevenin parameter identification of the AC side node in the system, so the existing method cannot be directly applied to the AC-DC interconnection grid
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[0042] The present invention will be further described below in conjunction with the drawings and embodiments:
[0043] figure 1 It is a flow chart of the online calculation method of Thevenin equivalent parameters of the AC-DC interconnected power grid of the present invention. Such as figure 1 The shown online calculation method of Thevenin equivalent parameters of the AC-DC interconnected power grid includes the following steps:
[0044] Step (1): Perform equivalent impedance or equivalent current source processing on the DC transmission unit in the AC-DC interconnected grid according to the PMU measured value to obtain the first modified admittance matrix of the AC-DC interconnected grid;
[0045] Step (2): Perform equivalent impedance processing on the load of the current state load node in the AC-DC interconnected power grid, and then modify the first modified admittance matrix again to obtain the second modified admittance after the equivalent impedance processing matrix;
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The invention discloses an alternating-current and direct-current interconnected power grid Thevenin equivalent parameter online calculation method. The method includes the steps that equivalent impedance or equivalent current source processing is conducted on a direct-current power transmission unit in an alternating-current and direct-current interconnected power grid according to PMU measurement values to obtain a primary correction admittance matrix; equivalent impedance processing is conducted on the load of current state load nodes in the alternating-current and direct-current interconnected power grid to obtain a secondary correction admittance matrix after equivalent impedance processing; load impedance at the current state load node in the alternating-current and direct-current interconnected power grid is cut off, and a node admittance matrix for open-circuit voltage is calculated according to the secondary correction admittance matrix; according to the node admittance matrix for open-circuit voltage and node state information of all nodes in the current state, a node voltage equation for open-circuit voltage is calculated; Thevenin equivalent impedance is calculated, and accordingly all Thevenin equivalent parameters of researched load nodes in the alternating-current and direct-current interconnected power grid can be obtained.
Description
Technical field [0001] The invention belongs to the field of the electric power industry, and particularly relates to an online calculation method of Thevenin equivalent parameters of an AC-DC interconnected power grid. Background technique [0002] As a complex cyber-physical system, the stable operation of the power system is inseparable from the monitoring and control of the state. Situational awareness enables grid operators to understand the current grid operation status and accurately predict what may happen in the future in order to take effective actions. Significantly improve the safety and economy of power system operation. One of the key reasons for the power outage in the United States and Canada on August 14, 2003 was the lack of situational awareness or insufficient situational awareness. Therefore, improving situational awareness is an important technical means for accurately and effectively mastering grid security. The US Federal Energy Regulatory Commission and n...
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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor贠志皓丰颖刘道伟
OwnerSHANDONG UNIV