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Calculation method and system for maximum power flow transfer capability of distributed power flow controller
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A power flow controller and power flow transfer technology, which is applied to AC network circuits, AC networks with the same frequency from different sources, electrical components, etc., can solve the problems of heavy line power flow, no calculation method, limited installation capacity, etc.
Active Publication Date: 2022-04-19
ZHEJIANG UNIV +1
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[0007] The power flow of the AC power grid is generally distributed naturally according to the line impedance. Due to the design of the grid structure, the power flow of some lines is often heavy, and the power flow of other lines is light. It is necessary to transfer the power flow of the heavy-duty lines through technical means For other lines, DPFC is a device to realize this function. However, since DPFC can only be installed on local lines, and the installation capacity is limited, the line current cannot be adjusted without limit. After DPFC with known capacity, it is necessary to carry out corresponding analysis Obtain its maximum power flow adjustment capability in order to issue follow-up regulation orders
[0008] At present, the maximum power transfer capability of DPFC can only be simply evaluated by trial and error method, and there is no effective calculation method
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Embodiment 1
[0041] Such as image 3 A method for calculating the maximum power flow transfer capability of a distributed power flow controller is shown.
[0042] According to the conventional method of the power grid, the parameters of the grid line, load and power supply are known, and those skilled in the art can easily calculate the power flow of the power grid under the known parameters through the electromechanical transient analysis software; at the same time, according to the engineering design, the maximum controllable AC voltage of the installed DPFC is also A known.
[0043] For this reason, the steps that the present invention adopts are as follows:
[0044] 1) According to the power grid parameters, the line flow P and line current I without DPFC are calculated by electromechanical transient analysis software;
[0045] 2) Obtain the number N of DPFC modules that can be put into operation in the line and the maximum operating voltage U of each module;
[0046] 3) Calculate t...
Embodiment 2
[0055] Such as Figure 4 The calculation system for the maximum power flow transfer capability of a distributed power flow controller is shown, which includes:
[0056] The first line calculation unit calculates and obtains the line power flow P and line current I without DPFC through electromechanical transient analysis software according to the grid parameters;
[0057] The DPFC module data acquisition unit is used to acquire the number N of DPFC modules that can be put into operation in the line and the maximum operating voltage U of each module;
[0058] The first maximum impedance calculation unit is used to calculate the first maximum impedance Z that can be put into the line, Z=N*U / I;
[0059] The number of iterations setting unit, set the number of iterations n=1;
[0060] The second line calculation unit, the first maximum impedance Z is serially inserted into the line, and other power grid parameters remain unchanged, and the line flow P at this time is calculated ...
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Abstract
The invention discloses a method and system for calculating the maximum power flow transfer capability of a distributed power flow controller. At present, the maximum power transfer capability of distributed power flow controllers can only be evaluated simply by trial and error method, and there is no effective calculation method. The invention firstly calculates the power flow deviation twice before and after the installation of the DPFC, and obtains the maximum power flow transfer capability of the DPFC by judging the size of the two power flow deviations and the allowable value of the deviation. The invention can effectively calculate the maximum power flow transfer capability of the distributed power flow controller, and is convenient for issuing follow-up control commands.
Description
technical field [0001] The invention belongs to the field of distributed power flow controllers, in particular to a method and system for calculating the maximum power flow transfer capability of a distributed power flow controller. Background technique [0002] DPFC: distributed power flow controller, a power electronic device that changes the line flow by changing the impedance of the series-connected line. Its topology is as follows figure 1 shown. [0003] Fast Bypass Switch (BPS): It consists of a high-speed mechanical bypass switch (K) and an anti-parallel thyristor (TBS) connected in parallel. It is closed when the line does not need to carry out power flow control (small power flow) or when the module is faulty, so as to realize the bypass of the module , open when the line needs to carry out power flow control, and connect the converter in series to the line. [0004] Voltage Source Converter (VSC): The function strobe switch strobes the VSC module, the distribute...
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