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Current sensorless grid access current control method applicable to grid-connected inverter

A current control and inverter technology, which is applied in the field of grid-connected inverter current control, can solve problems such as poor grid-connected adaptability, complex controller structure, and difficult parameter design, so as to achieve strong adaptability and avoid resonance and the possibility of cascading failures, and the effect of improving safe operation

Active Publication Date: 2018-08-24
SOUTHEAST UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a sensorless current control method suitable for grid-connected inverters to solve the existing controller structure of PI closed-loop control based on DQ rotating coordinates and PR closed-loop control under static coordinates Complicated, difficult parameter design, poor adaptability and poor grid connection adaptability and other problems

Method used

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  • Current sensorless grid access current control method applicable to grid-connected inverter
  • Current sensorless grid access current control method applicable to grid-connected inverter
  • Current sensorless grid access current control method applicable to grid-connected inverter

Examples

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Embodiment

[0026] Example: such as figure 2 As shown, a schematic diagram of the circuit connection for a single-phase photovoltaic grid-connected inverter scenario with an LCL filter is given. Phase locking is performed through multiple grid voltages to provide phase information for the grid current reference signal, and the capacitance in the LCL filter is detected. The instantaneous value of the voltage provides feed-forward compensation; the output voltage of the detection bridge arm and the input DC voltage are sent to the switch tube voltage drop compensation unit; the reference signal of the input current is passed through the first proportional regulator and the second proportional regulator of the open-loop control module of the input current. The regulator, the delayer, together with the feedforward compensation amount and the switching tube voltage drop compensation amount form a modulated wave and send it to the PWM generation module.

[0027] Specifically, the ratio of the ...

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Abstract

The invention relates to a current sensorless grid access current control method applicable to a grid-connected inverter, and relates to a system which consists of a grid-connected inverter main circuit and a grid-connected inverter control circuit; the grid-connected inverter control circuit comprises a grid access current open loop control module and a PWM generation module; the grid access current open loop control module comprises a first proportional regulator, a second proportional regulator, a time-delay device and an summator; the input ends of the first proportional regulator and thesecond proportional regulator are both led out to be used as the grid access current reference signal input end; the output end of the first proportional regulator is connected with the input end of the summator; the output end of the second proportional regulator is connected with the input end of the time-delay device; the output end of the time-delay device is connected with the input end of the summator; and the output end of the summator is connected with the PWM generation module. By virtue of the open loop current control method adopted by the system, non-static-error tracking of the grid access current reference signal by the grid access alternating current can be realized, and the severe operation conditions of power grid harmonic, imbalance and fault can be adapted.

Description

technical field [0001] The invention relates to the technical field of grid-connected inverter current control technology, in particular to a current control strategy for grid-connected inverters suitable for accessing various voltage levels of grids, specifically a grid-connected inverter current control strategy suitable for grid-connected inverters. The current sensorless type grid current control method of the device. Background technique [0002] At present, the rapid development of new energy sources, such as photovoltaic power stations and wind farms, requires a large number of grid-connected inverters to send electric energy into the traditional grid; at the same time, offshore wind power is particularly suitable for sending power into the AC grid system through high-voltage direct current transmission. Therefore, a large number of power electronic converters connecting the DC system and the AC grid operate in different voltage levels of the power system. [0003] W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/38H02J3/381H02J2300/24Y02E10/56H02M7/53871Y04S40/121Y02E60/00H02J13/00009H02M7/49H02M7/4803
Inventor 肖华锋
Owner SOUTHEAST UNIV
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