A multi-channel mppt photovoltaic inverter control loop system
A photovoltaic inverter and control loop technology, applied in photovoltaic power generation, circuit devices, AC network circuits, etc., can solve problems such as poor practicability, reduction of common-mode current, failure to establish, etc., to facilitate maintenance, reduce common-mode voltage, improve The effect of stability and reliability
Active Publication Date: 2017-03-29
TIANJIN RES INST OF ELECTRIC SCI
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Problems solved by technology
The literature "Transformerless single-phase multilevel-based photovoltaic inverter" establishes a common-mode equivalent model for a single-phase bridge-type three-level grid-connected inverter, and draws the conclusion that the common-mode voltage is constant, thereby reducing the common-mode current. However, this conclusion does not hold in a three-phase system
The literature "Research on Common-mode Current Suppression Technology of NPC Three-level Grid-connected Inverter" analyzes the common-mode characteristics of three-level photovoltaic inverters, and proposes compensation measures to enhance the common-mode suppression performance of three-level photovoltaic inverters, but , this method has poor practicability and is difficult to use in engineering practice
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[0019] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0020] A multi-channel MPPT photovoltaic inverter control loop system, such as figure 1 As shown, it includes a master station control device and a plurality of slave station control devices, and the number of slave station control systems can be two, three, four, six or eight, etc., and the present embodiment uses four slave stations to control system as an example. The master station control device is composed of master station high-voltage acquisition board, high-speed communication board, master station control board, and master station motherboard. The slave station control device includes slave station high-voltage acquisition board, slave station PWM board, slave station motherboard, power supply Board and driver board, the high-voltage acquisition board of the slave station, the PWM board of the slave station, and the motherboard of th...
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The invention relates to a multi-way MPPT (Maximum Power Point Tracking) photovoltaic inversion control circuit system which is technically characterized by being formed by connecting a main station control device and a plurality of slave station control devices, wherein the main station control device is formed by sequentially connecting a main station high-voltage acquisition board, a high-speed communication board, a main station control board and a main station motherboard; the slave station control devices comprise slave station high-voltage acquisition boards, slave station PWM (Pulse-width Modulation) boards, slave station motherboards, power supply boards and driving boards; the slave station high-voltage acquisition boards, the slave station PWM boards and the slave station motherboards are sequentially connected; and the power supply boards and the driving boards are connected with the slave station motherboards. The system employs a high-speed communication manner between the main station control device and the slave station control devices to achieve an inversion output carrier function, and reduces common mode voltage between inverters, the stability and reliability of the system are improved, and slave station PWM board cards are mutually independent and can be replaced mutually in the system, thereby facilitating maintenance.
Description
technical field [0001] The invention belongs to the field of photovoltaic inverter technology, in particular to a multi-channel MPPT photovoltaic inverter control loop system. Background technique [0002] A photovoltaic power generation system usually consists of a battery panel array and a power conversion (inverter) part, and usually requires a low-frequency transformer to be placed between the inverter and the grid for electrical isolation between the grid and the PV array. Non-isolated inverters are more and more valued by manufacturers due to their advantages of high efficiency, low cost, and small size. However, if the transformer is removed, the PV array will be electrically connected to the grid, and the common-mode current will increase significantly, bringing Potential safety hazards, and will also have adverse effects on the battery board. At present, the use of multi-MPPT (Maximum Power Point Tracking, maximum power point tracking) to increase the power generat...
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IPC IPC(8): H02J3/38
CPCH02J3/385Y02E10/56
Inventor 楚子林袁媛杨建新金雪峰田凯宋鹏
Owner TIANJIN RES INST OF ELECTRIC SCI