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ANDC-DC DC converter
source:管理员 time:2018-10-17

  1. Product Overview

  The bidirectional DC converter (DC/DC) series products can be widely used in systems requiring DC conversion to realize bidirectional flow of energy between DC busbars of different voltage levels, and the product can stably operate in two modes of constant voltage and constant current. In constant voltage mode, the product can accurately control the high voltage side/low voltage side voltage as needed, and the system current can be accurately controlled in constant current mode. At the same time, in order to adapt to the access of distributed power, the product also has the functions of maximum power point tracking, external environment adaptation and droop control.

  2, product introduction

  2.1 Product Model and Description



  2.2, product working principle and function

  2.2.1 bidirectional DC converter

  The bidirectional DC converter adopts the classic BUCK/BOOST circuit topology, and has the function of buck-boost bidirectional conversion, that is, the buck-boost circuit. When the energy flows from C1 to C2, the DC converter operates in BOOST mode to realize the boost function; when the energy flows from C2 to C1, the DC converter operates in BUCK mode to realize the step-down function. The topology circuit of the bidirectional DC converter is shown in Figure 2:



  Bidirectional DC converter function description:

  l Constant voltage charging, discharge machine conversion, constant power charging, discharging and conversion;

  l Two-way lifting and lowering on the battery side and DC bus side;

  l Compatible with a variety of batteries of different configurations and models;

  l The MPPT function is provided when the battery is connected to the photovoltaic panel;

  l Multiple converters in parallel operation control function (master-slave control, droop control);

  2.2.2 Multiple DC Converter

  The multi-channel DC converter also adopts the classic BUCK/BOOST circuit topology, and has the function of buck-boost bidirectional conversion, that is, the buck-boost circuit. Different from the bidirectional DC converter, the low-voltage side is decomposed into three independent control loops, which can simultaneously access different types of power supplies, and the high-voltage sides are connected in parallel to form a DC-collecting system for the common DC bus. The topology circuit of the multi-channel DC converter is shown in Figure 3:


  Multi-channel DC converter function description:

  l Each input can be independently controlled

  l Photovoltaic / energy storage adaptive operation

  l Support energy storage unit access with different characteristics such as energy type and power type

  2.2.3 Isolated DAB

  The isolated DAB adopts the classic full-bridge circuit topology. Unlike the first two converters, the bidirectional has the function of buck-boost bidirectional conversion, and the input and output are electrically isolated. The isolated DAB topology circuit is shown below:


  Isolated DAB function description:

  l Wide DC voltage variation range for boost/buck conversion

  l High-frequency transformer between input and output for fault isolation

  l Multiple DAB high-voltage side cascades can be applied to high-voltage direct-hanging occasions

  2.3 Product Features

  l The control platform adopts dual DSP+FPGA full digital control mode, adopts advanced main circuit topology and control algorithm, with high control precision and stable operation;

  l With constant voltage, constant current control, maximum power point tracking, multi-machine parallel operation and other functions;

  l Strong overload capability, 10% overload can run for 2h, 20% can run for 2min;

  l Friendly human-machine interface design, convenient for engineering personnel to operate;

  l Provide CAN and RS485 communication interfaces for external communication;

  l Multiple DC/DCs can be connected in parallel without interconnection, which is convenient for system expansion and redundancy control.

  l Support energy storage units with different characteristics such as energy type and power type;

  l System hierarchical protection to ensure safe operation of the system while reducing malfunctions;

  l With external environment adaptive function, not only can MPPT be realized in PV access but also can start and stop equipment according to external environment to reduce power loss;

  2.4 main technical parameters

  Table 1 Technical parameters


2.5 experimental waveform diagram


图5 直流变流器多级并联波形图             图6 直流变流器接入光伏波形图



图 7 直流变流器接入储能波形                  图8 隔离型DAB运行波形

 

2.6 whole cabinet physical map



  2.7 Selection method and order range

  l Select the appropriate DC converter according to the power of the required power supply or load;

  l The working voltage range of the required power supply or load (if you are not within the parameters, you can communicate with the technician first);

  l DC converter cabinet installation method;

  l One system diagram of the power distribution system;

  l The cabinet defaults to the incoming line mode. If there are special requirements, you can communicate in advance.

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