Islanding detection device and method based on active filtering and harmonic compensation
A filtering device and island detection technology, applied in harmonic reduction devices, measurement devices, and AC networks to reduce harmonics/ripples, etc., can solve problems such as aggravating power quality, deterioration, and impact on power grid quality, and improve power quality. , the effect of short detection time
Active Publication Date: 2019-03-29
毛国全
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Problems solved by technology
[0005] Although the islanding effect can be detected through the change of impedance in the above-mentioned patent, the quality of the power grid will inevitably be affected due to the additional injection of some signals into the power grid.
If the system load is a non-linear load, the power quality of the system will be poor, and the additional injected signal will aggravate the deterioration of the power quality
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[0034] An island detection device based on active filtering and harmonic compensation, characterized in that it includes an active filtering device (1), a distributed power generation device (2), a nonlinear load (3), a three-phase power grid (4), Output current sensor (5), load current sensor (6), grid current sensor (7) and common coupling point voltage sensor (8); active filter device (1), distributed power generation device (2) and nonlinear load ( 3) connected in parallel to the output end of the three-phase power grid (4), that is, the common coupling point PCC (12); the output current sensor (5) is connected to the output end of the active filtering device (1); the load current sensor (6) is connected to the non- The linear load (3) is connected in phase; the grid current sensor (7) and the common coupling point voltage sensor (8) are connected to the output end of the three-phase grid (4). The non-linear load (3) includes a three-phase uncontrolled rectifier bridge (9)...
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The invention discloses an island detection device and an island detection method based on active filtering and harmonic compensation. The detection device comprises an active filtering device, a three-phase grid-connected inverter and a nonlinear load. According to the invention, harmonic waves generated by the nonlinear load are compensated by using the active electric power filtering device so as to improve the quality of electric energy, the compensation rate of compensating current is changed periodically, then the compensating current of the active electric power filtering device is used as the disturbance quantity of an injection system, the compensating current of the active electric power filtering device and voltage of a point of common coupling are acquired so as to calculate equivalent impedance looking towards the system from a port of the active electric power filtering device, and whether an island effect occurs or not is detected through judging variation conditions of the impedance, so that island detection can be completed quickly while improving the quality of electric energy of the system.
Description
technical field [0001] The invention relates to an island detection device and method based on active filtering and harmonic compensation, and belongs to the application field of micro-grid fault detection and power quality control. Background technique [0002] In order to solve global energy problems, renewable new energy sources such as wind energy and solar energy have been widely used, and distributed power generation has developed rapidly. The distributed power generation system normally works in the grid-connected state, but when the power grid interrupts power supply due to electrical failures, misoperations, etc., the distributed power generation system forms a power supply island, which will bring serious problems to the safe operation of the power system , and even endanger the personal safety of equipment maintenance personnel. In addition, the wide application of nonlinear loads such as power electronic equipment will generate a large number of harmonics, which...
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IPC IPC(8): G01R31/00H02J3/01
CPCY02E40/40
Inventor 冬雷韩劲草黄晓江
Owner 毛国全