Islanding detection mothod for inverter and apparatus
AssigneeDelta Electronics (Shanghai) Co., Ltd.
InventorsLi Chen, Changyong Wang, Aibin Qiu
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Abstract
The present disclosure provides an islanding detection method for an inverter and a corresponding apparatus. The islanding detection method includes: step A1: obtaining a parameter of an output voltage of a three-phase AC system and a steady-state value corresponding to the parameter within a period of time; step A2: obtaining a disturbance signal based on the parameter and the steady-state value; step A3: superimposing the disturbance signal on at least one reference value of a droop control; and step A4: detecting the parameter added with the disturbance signal, and determining that island occurs in response to the parameter greater than an upper limit or less than a lower limit.
Claims15
An islanding detection method for an inverter in a three-phase alternating current (AC) system, the method being performed by a controller in the three-phase AC system and comprising:
- a step A1:
- obtaining, by the controller, a parameter of an output voltage of a three-phase alternating current (AC) system and a steady-state value corresponding to the parameter within a period of time;
- a step A2:
- obtaining, by the controller, a disturbance signal based on the parameter and the steady-state value;
- a step A3:
- superimposing, by the controller, the disturbance signal on at least one reference value of a droop control of the inverter;
- and
- a step A4:
- detecting, by the controller, the parameter after superimposing the disturbance signal on the at least one reference value, and determining, by the controller, that island occurs in the inverter in response to the parameter being greater than an upper limit or less than a lower limit,
- wherein the step A2 comprises:
- a step A21:
- comparing the steady-state value with the parameter;
- a step A22:
- obtaining a new parameter by superimposing an increment to the parameter when the steady-state value is not equal to the parameter;
- and
- a step A23:
- calculating an error between the steady-state value and the new parameter, and obtaining the disturbance signal by reversing the error.
An electronic device, comprising:
- a processor;
- and
- a memory for storing instructions executable by the processor;
- wherein the processor is configured to:
- obtain a parameter of an output voltage of a three-phase alternating current (AC) system and a steady-state value corresponding to the parameter within a period of time;
- obtain a disturbance signal based on the parameter and the steady-state value;
- superimpose the disturbance signal on at least one reference value of a droop control;
- and
- detect the parameter after superimposing the disturbance signal on the at least one reference value, and determine that island occurs in response to the parameter being greater than an upper limit or less than a lower limit,
- wherein the processor is further configured to:
- compare the steady-state value with the parameter;
- obtain a new parameter by superimposing an increment to the parameter when the steady-state value is not equal to the parameter;
- and
- calculate an error between the steady-state value and the new parameter, and obtain the disturbance signal by reversing the error.
A non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when being executed on a computer, causes the computer to perform operations for detecting islanding in an inverter, the operations comprising:
- obtaining a parameter of an output voltage of a three-phase alternating current (AC) system and a steady-state value corresponding to the parameter within a period of time;
- obtaining a disturbance signal based on the parameter and the steady-state value;
- superimposing the disturbance signal on at least one reference value of a droop control;
- and
- detecting the parameter after superimposing the disturbance signal on the at least one reference value, and determining that island occurs in response to the parameter greater than an upper limit or less than a lower limit,
- wherein said obtaining the disturbance signal based on the parameter and the steady-state value comprises:
- comparing the steady-state value with the parameter;
- obtaining a new parameter by superimposing an increment to the parameter when the steady-state value is not equal to the parameter;
- and
- calculating an error between the steady-state value and the new parameter, and obtaining the disturbance signal by reversing the error.
Dependencies are inferred from the claim text.