Continuous power flow algorithm of large-scale alternating current and direct current interconnected electric power system
A technology for power systems and DC systems, applied in power transmission AC networks, electrical components, etc., can solve problems such as unapplied applications, and achieve the effect of enhancing flexibility and fast computing speed
Active Publication Date: 2014-07-30
STATE GRID TIANJIN ELECTRIC POWER +1
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Problems solved by technology
At present, the continuum power flow method is limited to the load margin and voltage collapse point analysis of the alternating current (AC) system, and the continuum power flow calculation method for static voltage stability analysis in the actual AC / DC hybrid system has not been applied
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[0041] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0042] A continuous power flow algorithm for a large-scale AC-DC interconnected power system, using a bidirectional iterative algorithm, belongs to the simultaneous solution method based on Newton's method in terms of calculation principle. In terms of technical implementation, the bidirectional iterative algorithm uses the voltage and current of the AC bus on the primary side of the DC system converter transformer as the coordination variables between the AC / DC systems, and establishes the corresponding constraint equations to realize a large-scale AC / DC hybrid system. The continuous power flow calculation of the system solves the voltage stability breakdown point of the system and the voltage change (PV) curve with the increase of active load.
[0043] The method will be described in detail below with an example. This embodiment adopts the a...
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The invention relates to a continuous power flow algorithm of a large-scale alternating current and direct current interconnected electric power system, which includes the following steps: determining the initial control mode of a direct current (DC) system, determining the initial operation state of the system, respectively building forward-backward sweep increment equations of the DC system in the prediction calculation process and the correction calculation process; building a power flow equation of an alternating current (AC) system after parameterization and a corresponding augmentation power flow equation; predicting the predicted value x p, m and lambda p, m at the position of the current operation point of the AC system through the forward-backward sweep method; conducting correction iterative calculation to obtain the value xm and lambdam of the current operation point through the forward-backward sweep method; judging whether a PV curve in a system in caluculation penetrates through the inflection point; conducting continuous power flow calculation according to the above steps to the iteration suspensive condition and outputting calculation results. The continuous power flow algorithm is reasonable in design, does not change iteration number and calculation accuracy of the whole-network connection solution power flow Newton method of an AC / DC interconnected network, separates the DC system from the AC system, only needs to locally modify the control equation of the DC system to change the control mode and improves flexibility.
Description
technical field [0001] The invention belongs to the field of static voltage stability analysis of power systems, in particular to a continuous power flow algorithm for large-scale AC-DC interconnected power systems. Background technique [0002] With the high-voltage direct current transmission (HVDC) system gradually put into grid operation, the complexity of the power system continues to increase, and the problem of voltage stability has gradually become the primary factor affecting the safe and stable operation of the system. The converter of the HVDC system consumes a large amount of reactive power during operation, which affects the voltage stability of the receiving end system. Early research methods for static voltage stability of AC / DC hybrid systems include short-circuit ratio method, maximum power method, voltage stability factor method, etc. These methods have equivalent and simplified direct current (DC) systems to varying degrees, so they are difficult to apply ...
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IPC IPC(8): H02J5/00H02J3/36
Inventor 张来薛振宇房大中闫大威赵帅赵利刚徐立志宗志刚
Owner STATE GRID TIANJIN ELECTRIC POWER