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Compensator and control method and system thereof

A control method and compensator technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, AC network circuits, etc., can solve the problems of low utilization rate, high switching loss, high frequency of switching devices, etc., to reduce investment cost, reduce switching losses, and maintain a balanced sinusoidal effect

Pending Publication Date: 2020-04-24
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some topologies proposed so far still have the problems of single function, low utilization rate and large loss.
In addition, when the carrier-phase-shifted sinusoidal pulse width modulation (CPS-SPWM) technology is used for cascaded H-bridge multilevel converters, the frequency of the switching devices is high and the resulting switching loss is also high.

Method used

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  • Compensator and control method and system thereof
  • Compensator and control method and system thereof
  • Compensator and control method and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The compensator includes: a series converter and a parallel passive filter;

[0051] The series converter is connected to the high-voltage side of the power grid, and is used to simultaneously compensate the fundamental wave voltage fluctuation and the harmonic voltage on the power grid side, and isolate the harmonic current;

[0052] The parallel passive filter is connected to the low-voltage side of the grid to provide a path for harmonic current.

[0053] The series converter includes: an IGBT tube, a diode and an LC filter;

[0054] Each of the IGBT tubes is connected in reverse parallel with a diode to form a module;

[0055] A bridge arm is formed by connecting two modules in series;

[0056] A cascaded H-bridge is formed by the two bridge arms, and the input end of the cascaded H-bridge is connected to a DC voltage;

[0057] N cascaded H-bridge inverters are formed by connecting the output ends of N cascaded H-bridges in sequence;

[0058] The output end of t...

Embodiment 2

[0072] Step 1: When a fault occurs, obtain the fault phase voltage to calculate the grid voltage to be compensated;

[0073] Step 2: The inverter simultaneously compensates the fundamental wave voltage fluctuation and the harmonic voltage on the grid side based on the grid voltage to be compensated, and isolates the harmonic current;

[0074] Step 3: Pass the isolated harmonic current into a parallel passive filter.

[0075] The cascaded H-bridge series compensator based on hybrid pulse width modulation and its control method include: modulation of three-phase N-cascaded H-bridge inverters, control of N-cascaded H-bridge series compensators, such as figure 2 As shown, the specific control process is as follows:

[0076] Step 1: When a fault occurs, obtain the fault phase voltage to calculate the grid voltage to be compensated;

[0077] Detect the power supply voltage U of phase A sa ;according to the supply voltage U of phase A sa Extract the fundamental voltage U sa * ...

Embodiment 3

[0094] Based on the same inventive concept, the present invention also provides a control system of a compensator, the system comprising:

[0095] Calculation module: used to obtain the fault phase voltage to calculate the grid voltage to be compensated after a fault occurs;

[0096] Compensation module: used for the series converter to simultaneously compensate the fundamental wave voltage fluctuation and the harmonic voltage on the grid side based on the grid voltage to be compensated, and isolate the harmonic current;

[0097] Isolation module: for passing the isolated harmonic current into a parallel passive filter.

[0098] The calculation module includes: an acquisition unit, a first calculation unit and a second calculation unit;

[0099] The acquisition unit is used to acquire the sinusoidal voltage of the same frequency and phase of the fault phase voltage, the fundamental voltage of the fault phase voltage, the equivalent output impedance, and the harmonic voltage a...

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Abstract

The invention discloses a compensator and a control method and system thereof. The compensator comprises a series converter and a parallel passive filter. The series converter is connected with the high-voltage side of a power grid and is used for compensating fundamental voltage fluctuation and harmonic voltage of the power grid side at the same time and isolating harmonic current. The parallel passive filter is connected with the low-voltage side of the power grid and is used for providing an access for the harmonic current. The balanced sine of the load voltage and the power grid current ismaintained. The voltage of the load end is always kept symmetrical and rated sine and is in the same phase as the fundamental voltage of the power grid under the condition that the power grid voltagedrops and distorts. The utilization rate of the device is improved, and the investment cost is reduced. High-quality multi-level output waveforms are guaranteed, and meanwhile switching loss can be reduced.

Description

technical field [0001] The invention relates to the field of power electronic control, in particular to a compensator and its control method and system. Background technique [0002] With the vigorous development of high-end manufacturing, sensitive loads have higher and higher requirements for power supply quality. According to statistics, the voltage fluctuation problem accounts for nearly half of the factors that cause serious harm to the load. However, a large number of applications of frequency converters, drives, household and industrial large-capacity nonlinear loads have brought serious harmonic pollution to the power grid, and thus produced a series of power quality problems. In addition, with the continuous integration of new energy into the grid, the uncertainty and randomness of its output power further aggravate the generation of voltage fluctuations on the grid side. Grid-connected converters such as wind and solar generate overcurrent, which even endangers t...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/01H02J3/24
CPCH02J3/1814H02J3/01H02J3/24Y02E40/30Y02E40/40
Inventor 段青盛万兴赵彩虹沙广林马春艳李振李鹏华谭璐
Owner CHINA ELECTRIC POWER RES INST
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