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A frequency modulation control method and frequency modulation controller considering the coupling characteristics of active power and reactive power

A controller and inertial control technology, applied in the direction of reducing/preventing power oscillation, single-network parallel feeding arrangement, etc., can solve problems such as rising proportion of residential electricity load, aggravated short-term load change, and insufficient power frequency modulation capability

Active Publication Date: 2020-12-22
STATE GRID HUNAN ELECTRIC POWER +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the large-scale grid-connection of wind power / photovoltaic power and the commissioning of high-voltage direct current transmission projects, the power structure of the power system has undergone tremendous changes, and the rapid frequency modulation capability of the power supply is insufficient; in addition, the adjustment of the industrial structure has increased the proportion of residential electricity loads, Short-term variations in load intensify
As a result, the frequency regulation capability of the existing receiving-end power grid has been difficult to meet the requirements brought about by the change of source-network-load characteristics
On the other hand, in the receiving-end power grid with large-scale traditional DC power transmission, the reactive power compensation equipment based on conventional capacitors has poor voltage regulation characteristics, and lack of dynamic reactive power support capability is a huge challenge for the receiving-end power grid.

Method used

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  • A frequency modulation control method and frequency modulation controller considering the coupling characteristics of active power and reactive power
  • A frequency modulation control method and frequency modulation controller considering the coupling characteristics of active power and reactive power
  • A frequency modulation control method and frequency modulation controller considering the coupling characteristics of active power and reactive power

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Embodiment 1

[0039] Embodiment 1 provides a frequency modulation controller considering the coupling characteristics of active power and reactive power, such as figure 1 As shown, including additional frequency modulation control module and terminal voltage control module;

[0040] The additional frequency modulation control module includes: a data acquisition unit, a first adder, an inertial control unit, a primary frequency modulation control unit, and a second adder;

[0041] The data acquisition unit is used to collect the actual frequency f of the power system in real time grid , the actual terminal voltage amplitude U t , The three-phase current i output by the grid-connected converter abc And the three-phase voltage u output by the LC filter tabc ;

[0042] The first adder is used to convert the actual frequency f of the power system grid with frequency reference f ref Make a difference to get the frequency deviation Δf of the power system;

[0043] The inertia control unit i...

Embodiment 2

[0051] Corresponding to the frequency modulation control method provided in the first embodiment, the second embodiment provides a frequency modulation controller considering the coupling characteristics of active power and reactive power, including the following steps:

[0052] Step 1, collect the actual frequency f of the power system in real time grid , the actual terminal voltage amplitude U t , The three-phase current i output by the grid-connected converter abc And the three-phase voltage u output by the LC filter tabc ;

[0053] Step 2, the actual frequency f of the power system grid with frequency reference f ref Make a difference to get the frequency deviation Δf of the power system:

[0054] Δf=f grid -f ref ;

[0055] Step 3: Input the frequency deviation Δf of the power system into the inertia control unit and the primary frequency modulation control unit respectively, and obtain the terminal voltage amplitude reference value U under inertia control respect...

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Abstract

The invention discloses a frequency modulation control method and a frequency modulation controller by considering active and reactive coupling characteristics. The frequency modulation control methodcomprises the steps of: firstly obtaining the actual frequency of a power system by detecting the frequency of a port voltage of an LC filter at the output end of a grid-connected converter, so as toobtain frequency deviation relative to a frequency reference value; then, adding an additional frequency control module in front of a terminal voltage control module, performing inertia control and primary frequency modulation control by taking the frequency deviation as input, directly correcting a terminal voltage amplitude reference value according to the obtained result to achieve adjusting of the terminal voltage amplitude of the grid-connected converter by the terminal voltage control module. The active power output or absorbed by the grid-connected converter can be changed, so that thegrid-connected converter has the capability of resisting frequency disturbance.

Description

technical field [0001] The invention relates to frequency dynamic stability analysis of a power system, in particular to a frequency modulation control method and a frequency modulation controller which are applied to a grid-connected converter and consider the coupling characteristics of active power and reactive power. Background technique [0002] With the large-scale grid-connection of wind power / photovoltaic power and the commissioning of high-voltage direct current transmission projects, the power structure of the power system has undergone tremendous changes, and the rapid frequency modulation capability of the power supply is insufficient; in addition, the adjustment of the industrial structure has increased the proportion of residential electricity loads, Short-term variations in load are exacerbated. As a result, the frequency regulation capability of the existing receiving-end power grid has been difficult to meet the requirements brought about by the change of so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/48H02J3/50H02J3/24
CPCH02J3/24H02J3/48H02J3/50
Inventor 王玎沈阳武胡臻严亚兵崔挺左剑呙虎张可人毛荀曹伟李龙向萌李晨坤
Owner STATE GRID HUNAN ELECTRIC POWER
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