A rlc load simulation system for anti-islanding detection and its control method
A load simulation and analog control technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of poor accuracy and reliability, large parasitic influence, and high requirements for component selection, saving electric energy and achieving high performance. The effect of stepless adjustment of precision to meet the needs of anti-islanding characteristics test research
Active Publication Date: 2020-05-12
CHINA ELECTRIC POWER RES INST +2
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[0007] Aiming at the deficiencies of the prior art, the present invention proposes an RLC load simulation system for anti-islanding detection and its control method, in order to solve the current anti-islanding test device's high requirements for component selection, large parasitic influence, accuracy and It can conveniently and flexibly realize various load characteristic simulations to meet the requirements of anti-islanding detection of grid-connected inverters due to problems such as poor reliability
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[0058] The present invention will be described in further detail below in conjunction with the accompanying drawings. In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0059] Grid-connected inverter anti-islanding detection scheme such as figure 2 , the grid-connected inverter is the device under test (EUT). The EUT is connected to the power grid at nodes U, V, W, and the anti-islanding RLC load ...
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The invention provides an RLC load simulation system for preventing island detection, and a control method of the RLC load simulation system. The system comprises an energy feedback unit, a load characteristic simulation unit, a control module, and a control platform. An AC end of the energy feedback unit is connected to an AC power grid, and a DC end of the energy feedback unit and the load characteristic simulation unit share a DC bus. An AC end of the load characteristic simulation unit is connected with a grid-connected inverter, and then is connected to the AC power grid. The control module receives an instruction of the control platform, and transmits the instruction to the energy feedback unit and the load characteristic simulation unit. The energy feedback unit carries out the pulse width modulation rectification of a power grid voltage according to the instruction of the control platform. The load characteristic simulation unit selects the working mode according to the instruction of the control platform. According to the technical scheme of the invention, the energy is transmitted to the load characteristic simulation unit from an EUT, and then is fed back by the energy feedback unit to the power grid, thereby saving an energy consumption resistor in a conventional RLC island prevention load device, and saving a large amount of electric energy, so the system is greenand environment friendly.
Description
technical field [0001] The invention belongs to the technical field of variable flow control, and in particular relates to an RLC load simulation system for anti-islanding detection and a control method thereof. Background technique [0002] The smart grid and distributed power generation technology containing renewable energy have been rapidly developed and popularized in the past ten years. Since the grid-connected system directly inverts the electric energy generated by renewable energy and feeds it to the grid, it must meet the grid-connected requirements during work. technical requirements to ensure the safety of system installers and the reliable operation of the grid. For fault states such as overcurrent of power devices, overheating of power devices, and over / undervoltage of the power grid that may occur during normal system operation, it is relatively easy to detect, identify and deal with them through the cooperation of hardware circuits and software. However, for...
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IPC IPC(8): H02J3/38G01R31/00
CPCG01R31/00H02J3/38H02J3/388
Inventor 杨波李官军庄俊陶以彬周晨余豪杰胡安平刘欢曹远志桑丙玉崔红芬鄢盛驰李跃龙
Owner CHINA ELECTRIC POWER RES INST