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Voltage control system and method for grid-connected point of microgrid based on power coordinated regulation

A point voltage control, micro grid technology, applied in AC network voltage adjustment, reducing/preventing power oscillation, reactive power compensation, etc. The effect of small power loss and burden reduction

Active Publication Date: 2022-08-05
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When only changing the flow of active power at the grid-connected inverter to adjust the voltage at the grid-connected point, it is impossible to maximize the transmission of active power from the microgrid to the distribution network
When only changing the flow of reactive power at the grid-connected inverter to adjust the voltage at the grid-connected point, it is necessary to consider the power factor at the PCC when the microgrid is in grid-connected operation. In a microgrid with a lower voltage level, the reactive power The flow has little effect on the voltage at the PCC. To restore the PCC voltage to normal, a large amount of reactive power is needed as a support, which may cause overcompensation and reduce the power factor.
Changing the active or reactive power alone to adjust the grid-connected point voltage will also increase the burden on the capacity of the grid-connected inverter and increase the power loss of the inverter

Method used

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  • Voltage control system and method for grid-connected point of microgrid based on power coordinated regulation
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  • Voltage control system and method for grid-connected point of microgrid based on power coordinated regulation

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Embodiment 1

[0068] This embodiment provides a microgrid grid-connected point voltage control system based on power cooperative regulation.

[0069] The voltage control system at the grid-connected point of the microgrid based on power coordinated regulation is suitable for the microgrid under grid-connected conditions, including: a voltage stabilization compensation current loop, which compares the instantaneous amplitude of the voltage at a given point PCC with a given voltage amplitude reference value The difference is sent to the voltage regulator compensation current loop;

[0070] The signal adjusted by the first PI regulator in the voltage stabilization compensation current loop is added with the signal output by the active current loop to obtain the active current reference value;

[0071] The difference between the active current reference value and the given d-axis current value is input to the second PI regulator, the output signal is sent to the SPWM pulse width modulation modu...

Embodiment 2

[0101] This embodiment provides a method for controlling the voltage of a grid-connected point of a microgrid based on power cooperative regulation.

[0102] The method for controlling the voltage of the grid-connected point of the microgrid based on the power cooperative adjustment adopts the voltage control system of the grid-connected point of the microgrid based on the power cooperative adjustment described in the first embodiment, including:

[0103] Voltage at the grid connection point When fluctuations occur, the current on the line The voltage difference across the line impedance Z is make the voltage at PCC become

[0104] Three-phase full-bridge voltage grid-connected inverter needs to output power compensation current This power compensation current creates a new voltage difference on the line Restore the voltage at the PCC to steady state place.

[0105] The invention adopts a three-phase full-bridge voltage grid-connected inverter, and performs Park tr...

Embodiment 3

[0115] This embodiment provides a method for controlling the voltage of a grid-connected point of a microgrid based on power cooperative regulation.

[0116] The method for controlling the voltage of the grid-connected point of the microgrid based on the power cooperative adjustment adopts the voltage control system of the grid-connected point of the microgrid based on the power cooperative adjustment described in the first embodiment, including:

[0117] When the power factor λ of the microgrid at the PCC is not lower than the specified value λ * hour,

[0118] The power compensation current Decomposed into active current compensation components and reactive current compensation components Calculate the compensation current power factor angle β;

[0119] Make the compensation current power factor angle β equal to the line impedance angle α, and the three-phase full-bridge voltage grid-connected inverter outputs the reactive power compensation current to restore the pow...

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Abstract

The invention belongs to the field of microgrid grid-connected point voltage control, and provides a microgrid grid-connected point voltage control system and method based on power coordinated regulation, which is suitable for a microgrid under grid-connected conditions. The system includes: a voltage stabilization compensation current loop, which sends the difference between the instantaneous amplitude of the voltage at a given point PCC and a given voltage amplitude reference value into the voltage stabilization compensation current loop; after the first PI adjustment in the voltage stabilization compensation current loop The signal adjusted by the controller is added with the signal output by the active current loop to obtain the active current reference value; the difference between the active current reference value and the given d-axis current value is input to the second PI regulator, and the output signal is sent to the SPWM pulse width A modulation module, the generated modulation signal is used to control the voltage or power of the grid connection point; the input signal of the active current loop includes a given reference value of active power and a d-axis voltage value.

Description

technical field [0001] The invention belongs to the field of voltage control of a grid-connected point of a microgrid, and in particular relates to a system and method for controlling the voltage of a grid-connected point of a microgrid based on power coordinated regulation. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The point of common coupling (PCC) voltage stability between the microgrid and the large grid is a key issue in the development of microgrid technology. When the PCC voltage fluctuates, the grid-connected inverter can change the active power on the line. Or the flow of reactive power for voltage control at the PCC. [0004] When only changing the flow of active power at the grid-connected inverter to regulate the voltage at the grid-connected point, it is impossible to maximize the transfer of the active power of the mic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46H02J3/48H02J3/50H02J3/12H02J3/16H02J3/24
CPCH02J3/46H02J3/48H02J3/50H02J3/12H02J3/16H02J3/24H02J3/002H02J2203/10Y02E40/30
Inventor 侯梅毅呼延天亮丁磊朱国防于昊高浩朱振
Owner SHANDONG UNIV
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