Solution

双向DC/DC储能变流器技术

Release time:2017-12-01

Rated power: 5 kW (if long run, the proposed power is limited to less than 4 kW), efficiency >94%
DC power supply DC voltage: 500 V (working voltage range 300 V - 600 V)
Battery voltage: 220 DC - V (working voltage range 90 V - 240 (V) by the ratio of the battery voltage is not lower than DC, DC power supply voltage of 1/6 DC power supply: to boost output to run 600V, the low pressure side of at least more than 100V; such as Buck run, 300V-600V input to charge the battery, no this restriction allows the battery from the 0 voltage to start charging)
The control mode: constant power control, DC voltage droop control (reference manual voltage controlled current source mode, can achieve the same control effect, but because the chip shortage has shielding of this mode, you can add back, but at the same time may be shielding some other function (such as MPPT) to make the chip resources)
Communication interface: RS485
Output / input voltage ripple: = = 1%
Output / input current ripple: = 2%
The constant power control: communication input -5000 ~ 5000 W, converted into the current instruction, voltage controlled current; (the DCDC control loop for current loop, such as power control, need to calculate the current / voltage = power, the division operation requires more resources, better to set the current instruction)
The DC voltage droop control can change the output current to the DC microgrid according to the voltage change of 500 V microgrid (420 V to 520 V minimum range), and the voltage output to the DC microgrid is consistent with the voltage Vdc_bus of real-time DC microgrid. The key points of the curve (A, B, C, D) can be changed by communication, as shown in Figure 3.3 (a), figure 3.3 (b). (it is best to set the target voltage in the voltage controlled current source mode and the voltage controlled current source admittance gain, so as to achieve similar control purposes. A simple P-V function relation can be integrated into it. For complex P-V curves, it is suggested that an additional control panel should be applied to generate the corresponding current value according to the real time voltage, and to rewrite current settings through communication to achieve this function.
When V_battary < = 90 V, Power decreased gradually, gradually stop working; (by DCDC voltage ratio limit is 1.15 - 6 limit: if the grid side voltage below 450V, can stop the discharge point set to 80V; if the grid side voltage is 600V, stop the discharge point set 100V above)

图 3.3 (a) 直流电压下垂控制

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双向DC/DC储能变流器技术

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