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Distributed power flow controller power flow control mode fixed value conversion method and system

A power flow controller and power flow control technology, which is applied to AC networks with the same frequency from different sources, electrical components, etc., can solve problems such as real-time power flow analysis and inability to carry out network-wide power flow analysis

Active Publication Date: 2021-12-28
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, in the actual power grid operation process, when DPFC is controlled according to the power flow control mode, the impedance is calculated by measuring the DPFC output voltage and line current, but this mode cannot carry out the power flow analysis of the whole network in advance, and can only carry out real-time power flow analysis

Method used

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  • Distributed power flow controller power flow control mode fixed value conversion method and system
  • Distributed power flow controller power flow control mode fixed value conversion method and system
  • Distributed power flow controller power flow control mode fixed value conversion method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 2 A fixed value conversion method of the power flow control mode of the distributed power flow controller is shown, which uses the power flow control fixed value P ref Convert to Impedance Rating Z ref ,Proceed as follows:

[0048] 1) Compared with the power flow control fixed value P ref The power flow P when the corresponding DPFC output voltage is maximum max size, if P ref ≥P max , then switch to injection voltage mode, the injected voltage controls the fixed value U ref equal to the maximum voltage U max , and calculate the corresponding impedance value Z ref ; if P ref max , then go to the next step;

[0049] 2) Calculate the voltage control setting value U ref =U 1 =U max / 2 corresponds to the first impedance Z 1 , U 1 is the first iteration voltage;

[0050] 3) Set the number of iterations n=2;

[0051] 4) Insert the second impedance Z in series in the line n-1 , other power grid parameters remain unchanged, and the power flow va...

Embodiment 2

[0062] Such as image 3 A distributed power flow controller voltage control mode fixed value conversion system is shown, which uses the power flow control fixed value P ref Convert to Impedance Rating Z ref , which includes:

[0063] The first comparison unit, compared with the power flow control fixed value P ref The power flow P when the corresponding DPFC output voltage is maximum max size, if P ref ≥P max , then switch to injection voltage mode, the injected voltage controls the fixed value U ref equal to the maximum voltage U max , and calculate the corresponding impedance value Z ref ; if P ref max , then go to the next step;

[0064] The first impedance calculation unit, which calculates the voltage control setting value U ref =U 1 =U max / 2 corresponds to the first impedance Z 1 , U 1 is the first iteration voltage;

[0065] The number of iterations setting unit, set the number of iterations n=2;

[0066] The first line power flow calculation unit is co...

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Abstract

The invention discloses a fixed value conversion method and system of a power flow control mode of a distributed power flow controller. At present, when the distributed power flow controller is controlled in the power flow control mode, the impedance is calculated by measuring the DPFC output voltage and the line current. However, this mode cannot carry out the power flow analysis of the whole network in advance, and can only carry out the real-time power flow analysis. In the present invention, the power flow control is first performed to set the value P ref The power flow P when the corresponding DPFC output voltage is maximum max The size comparison, and then set the value P in the power flow control ref Less than the power flow P at the maximum output voltage of the corresponding DPFC max In the case of , calculate the power flow values ​​of the first and last two times, and finally use the absolute value of the power flow difference ratio and the allowable value of the deviation to determine the fixed value of impedance. The invention converts the fixed value of the power flow control into the fixed value of impedance, so that the power flow control mode can obtain impedance data through simple calculation, and is suitable for carrying out the power flow analysis of the whole network in advance.

Description

technical field [0001] The invention belongs to the field of distributed power flow controllers, and in particular relates to a fixed value conversion method and system of a power flow control mode 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 distr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/10
Inventor 裘鹏金玉琪郭锋陆承宇徐华王松陆翌张静潘武略
Owner ZHEJIANG UNIV
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