Control device and control method for maintaining voltage stability of confluence DC bus in distributed power generation system
A DC bus voltage and distributed power generation technology, which is applied in the direction of parallel operation of DC power supplies, can solve the problems of DC bus voltage fluctuations and unfavorable system operation, and achieve the effect of smooth switching
Active Publication Date: 2016-06-29
HARBIN ENG UNIV
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[0003] On the other hand, in order to obtain more electric energy from nature, each power generation device may set a maximum power capture (MPPT, Maximum Power Point Tracking) algorithm according to its actual situation, and each device injects power into the busbar in a current mode (approximately controllable current source). Energy, so in the independent microgrid mode, it will cause voltage fluctuations of the DC bus bus, which is not conducive to the operation of the entire system
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[0026] The following examples describe the present invention in more detail.
[0027] combine figure 1 and figure 2 , taking the power generation system 1 as an example for illustration.
[0028] attached figure 1 Among them, CS1-CSN are current HALL sensors, which are used to detect the output current of each DC / DC converter module. VS1-VSN are voltage HALL sensors, which are used in each power generation system to detect the voltage value of the DC return bus. MPPT is the maximum power point tracking module, which generates the command current value i that can obtain the maximum power according to the operation of the power generation device (such as solar cells, wind generators, etc., not shown in the figure) r1 , this value is the same as the actual output current i of the power generation system o1 The deviation is used for PI regulation to generate a control signal v c1 ; attached figure 2 DROOP in is the voltage droop module, and its droop coefficient is K d1 ...
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The invention provides a control device and a control method for maintaining the voltage stability of a converging DC bus in a distributed power generation system. In order to realize the parallel operation of the converters of multiple power generation devices without interconnection communication, the voltage command signal is calculated from the actual output current according to the preset droop characteristics, and the current command signal is calculated by the MPPT algorithm or by the system according to Given the actual situation, the two control signals obtained by the calculation of the voltage control loop and the current control loop are sent to the small link of the CPU control software, and the output of this link is used for PWM modulation to ensure that the current control mode does not overvoltage, In the voltage control mode, there is no current flow, and the smooth switching between multiple power conversion devices in the current control mode and voltage control mode is realized, and under the condition of no interconnection communication line, multiple converters can achieve stable power according to their own available power. output in parallel.
Description
technical field [0001] The invention relates to a DC bus voltage stabilization control technology in a distributed power generation system. Background technique [0002] A distributed power generation system may include multiple photovoltaic solar power generation devices, wind power generation devices, ocean current power generation devices, and biomass power generation devices. Under the conditions of DC bus or DC microgrid, these devices transmit DC power to the busbar. Since the design capacities of these power generating devices are different, even if the capacity is the same, at the same time, due to the influence of weather and environmental factors, there may be large differences in the output power of each generating device. For example, solar power generation has no output at night, while wind power generation is available. [0003] On the other hand, in order to obtain more electric energy from nature, each power generation device may set a maximum power capture...
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IPC IPC(8): H02J1/12
Inventor游江罗耀华马佳睿张敬南巩冰孟繁荣
OwnerHARBIN ENG UNIV