Micro-inverter alternating-current side power coupling system and control method
A power coupling and micro-inverter technology, which is applied to the AC side power coupling circuit of the six-switch micro-inverter, the micro-inverter AC side power coupling system and the control field, can solve the problems of limited efficiency, cumbersome circuits and complicated control. And other issues
Active Publication Date: 2020-03-24
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology
[0008] To sum up, the problems existing in the prior art are: the existing power decoupling circuit uses too many switches, the circuit is cumbersome, and affects the dynamic response of the main circuit
[0011] Most of the existing AC-level power decoupling technologies have complex control, many switching elements, and limited efficiency
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[0116] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0117] In the prior art, the AC-side output terminal is not connected in parallel, which affects the power coupling function of the electrolytic capacitor, and the circuit coupling capacitance value is too high, which shortens the efficiency and service life of the micro-inverter. Moreover, in the prior art, since the input power is constant on the DC side, and the output power is sinusoidally changing on the AC side, although the average values of the two are basically the same, the instantaneous values are not consistent, resulting in the energy between the two not being effective. buffer.
[0118] Aiming at the prob...
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The invention belongs to the technical field of micro-inverters, and discloses a micro-inverter alternating-current side power coupling system and a control method. S1 and D1, S2 and D2, S3 and D3, S4and D4, S5 and D5, and S6 and D6 are in anti-parallel connection. The collector of the S1 and the collector of the S3 are connected with the Uinv-. The collector electrode of the S2 and the collectorelectrode of the S4 are connected with the Uinv +. The emitter of the S1 and the emitter of the S2 are connected with one end of the coupling capacitor. The emitter of the S3 and the collector of theS5 are connected with one end of the coupling inductor. The emitter of the S4 and the collector of the S6 are connected with the other end of the coupling inductor. The emitter of the S5 and the emitter of the S6 are connected with the other end of the coupling capacitor. According to the invention, the coupling capacitance value in the micro-inverter is reduced, the miniaturization design of thecoupling capacitance is realized, the working efficiency of the inverter is improved, and the service life of the whole micro-inverter is prolonged.
Description
technical field [0001] The invention belongs to the technical field of micro-inverters, and in particular relates to a micro-inverter AC side power coupling system and a control method. Specifically relates to a six-switch micro-inverter AC side power coupling circuit. Background technique [0002] At present, the closest existing technology: the micro-inverter with many advantages is beginning to occupy the stage of the future distributed photovoltaic inverter. Based on the problem that the constant input power generated by the photovoltaic modules controlled by MPPT does not match the AC side power of twice the power frequency on the grid, the traditional solution is to use electrolytic capacitors as a buffer to achieve the balance between the photovoltaic output power and the AC side power. Unanimity. And because the service life of most semiconductor devices and passive devices is 5 to 10 times that of electrolytic capacitors. The huge gap in the life of the two limit...
Claims
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Login to View More IPC IPC(8): H02J3/38
CPCH02J3/38
Inventor 章勇高付伟东常玉严胜樊越迮思源柴成凯王小衬刘鹏
Owner EAST CHINA JIAOTONG UNIVERSITY