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Receiving end power grid dynamic load flow analysis method and system after DC fault of electric power system

A technology of the receiving-end power grid and power system, which is applied to AC networks, circuit devices, and AC network circuits with the same frequency from different sources. Primary frequency modulation response and other problems, to achieve the effect of improving the level of safe and stable operation and improving the accuracy

Inactive Publication Date: 2018-05-25
CHINA ELECTRIC POWER RES INST +2
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AI Technical Summary

Problems solved by technology

Existing power flow calculation algorithms usually use a single balancing machine or multiple balancing machines for joint adjustment after a large-scale power loss, without considering the primary frequency modulation response of the unit and load, resulting in distortion of the power flow calculation results, and the frequency change process cannot be reflected

Method used

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  • Receiving end power grid dynamic load flow analysis method and system after DC fault of electric power system
  • Receiving end power grid dynamic load flow analysis method and system after DC fault of electric power system
  • Receiving end power grid dynamic load flow analysis method and system after DC fault of electric power system

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Embodiment Construction

[0065] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0066] Such as figure 1 As shown, the present invention provides a dynamic power flow analysis method for a receiving-end power grid after a DC fault in a power system, comprising the following steps:

[0067] Step 1: Collect real-time power grid operation data information of the power system;

[0068] Step 2: Calculate the missing power of the receiving end grid after the DC fault;

[0069] Step 3: Calculate the dynamic primary frequency of the receiving system;

[0070] Step 4: Calculating load and operating unit output adjustments;

[0071] Step 5: Calculate the unbalanced power of the power grid at the receiving end;

[0072] Step 6: Determine whether the unbalanced power satisfies the convergence criterion, if so, proceed to step 7, otherwise return to step 3 for iterative calculation;

[0073] Step 7: Carry out the power flow calculation...

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Abstract

The invention provides a receiving end power grid dynamic load flow analysis method and system after a DC fault of an electric power system. The method includes the following steps: acquiring the real-time power grid operation data information of an electric power system, computing deletion power of a receiving end power grid after a DC fault, computing one dynamic modulation frequency of a receiving end system, computing a load and an operation set output adjusting amount, resolving an unbalanced power of the receiving end power grid, determining whether the unbalanced power meets convergencecriterion, if the unbalanced power meets convergence criterion, computing the load flow of the electric power system of the entire power grid, and if the unbalanced power does not meet convergence criterion, returning to step 3 and performing iterative computation, and if the unbalanced power meets convergence criterion, performing load flow computation, and finally outputting a computation result. The system includes: a data acquiring module, a computation module, a determination module and an output module. According to the invention, the technical solution herein addresses the inaccurate computation that is caused by failure to consider system dynamic frequency characteristics of traditional load flow computation of the electric power system, and can increase the accuracy of system load flow analysis result after the fault of the electric power system.

Description

technical field [0001] The invention relates to power system analysis, in particular to a dynamic power flow analysis method for a receiving-end power grid after a DC fault in the power system. Background technique [0002] The power flow calculation of the power system is a basic calculation for studying the steady-state operation of the power system. It is an indispensable and important part of the planning and operation of the power system. The basis for security, economic analysis and real-time control. [0003] During the 13th Five-Year Plan period, my country's UHV AC and DC transmission projects will be put into operation intensively, the long-distance inter-regional and inter-provincial transmission capacity will increase significantly, the power grid structure will undergo major changes, and the requirements for the accuracy of online analysis and calculation results of the power system will increase. Existing power flow calculation algorithms usually use a single ...

Claims

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 宋旭日王磊王淼马晓忱马超刘金波常乃超王轶禹葛睿郎燕生郭子明张昊赵昆罗雅迪李静李理邢颖张印王少芳刘鹏庄伟冯长有金一丁杨建平王治华
Owner CHINA ELECTRIC POWER RES INST
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