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Grid-connected point voltage rise suppression method for distributed generation system

A technology of distributed generation and point voltage, applied in the direction of AC network voltage adjustment, high-efficiency power electronic conversion, electrical components, etc., can solve the problem of not considering the change of load, etc., to suppress the voltage increase at the grid connection point and improve the penetration of the grid connection. efficiency, enhanced reliability and stability

Active Publication Date: 2020-06-05
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

fixed power factor method and The method is based on the measured active power value to indirectly realize the voltage support of the grid-connected point, and it is assumed that the increase of the grid voltage is related to the active power generated by the inverter, without considering the change of the load

Method used

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  • Grid-connected point voltage rise suppression method for distributed generation system
  • Grid-connected point voltage rise suppression method for distributed generation system
  • Grid-connected point voltage rise suppression method for distributed generation system

Examples

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] The structure of the three-phase inverter applying the method for suppressing the voltage rise at the grid-connected point of the distributed power generation system of the present invention is as follows: figure 1 Shown: includes inverter main circuit part 10 and inverter control circuit part 20 . The grid-connected point voltage, inverter output current, DC voltage, and current signals enter the inverter control circuit part 20 through the sampling circuit 201, and the PWM control signal calculated by the inverter control circuit part 20 controls the inverter through the drive circuit 204 The main circuit.

[0038] The inverter main circuit part 10 includes a DC bus power supply Vdc, a three-phase inverter bridge 101 , a three-phase filter inductor 102 , a three-phase filter capacitor 103 and a three-phase transformer 104 . The DC bu...

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Abstract

The invention relates to a grid-connection point voltage rise suppression method for a distributed power generation system, the method is based on grid-connection point voltage and output active power, three-phase reactive power control is adopted, the grid-connection point voltage and the inverter output active power are comprehensively considered, absorbed reactive power value is finally determined, and the control for the distributed power generation system and the grid-connection point voltage can be dynamically realized. The method is suitable for a distributed power generation system with high density and a plurality of access points.

Description

technical field [0001] The invention relates to a method for suppressing voltage rise at grid-connected points of a distributed power generation system. Background technique [0002] With climate warming and energy crisis becoming increasingly prominent, renewable energy has become a development trend, among which solar photovoltaic power generation is an important form of renewable energy utilization. The grid-connected operation of large-scale photovoltaic power generation systems may cause the problem of reverse current flow, resulting in voltage rise or overvoltage at the point of common connection (PCC) of the photovoltaic power generation system. The problem of voltage rise is especially prominent in the low-voltage network of high-density multi-access point distributed generation system. The increase in voltage not only affects the quality of power supply for local loads, but also increases the loss of power transmission and distribution equipment such as transformer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/16H02M7/5387H02M1/42
CPCH02J3/16H02J3/381H02M1/42H02M7/5387Y02B70/10Y02E40/30
Inventor 张颖杨子龙王一波
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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