Control method and control device of microgrid inverter and microgrid inverter
A control method and a technology of a control device, which are applied in the directions of single-net parallel feeding arrangement, multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, etc., can solve fast response speed, fluctuation sensitivity, and poor system stability and other problems to achieve the effect of suppressing resonance, improving stability and improving ability
Active Publication Date: 2019-10-22
BEIJING ETECHWIN ELECTRIC
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However, the droop-controlled microgrid inverter responds quickly, lacks rotating devices to provide moment of inertia, and the output frequency is sensitive to load fluctuations; moreover, the adjustment of the droop coefficient is complicated, and the stability of the system is poor
In addition, the unbalanced load (that is, single-phase load) of the microgrid will cause the output voltage of the microgrid inverter to produce negative sequence components, which will lead to the three-phase unbalance of the output voltage of the microgrid inverter, causing microgrid inversion. Inverter output overvoltage or overcurrent
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[0038] Various example embodiments will now be described more fully with reference to the accompanying drawings, in which some example embodiments are shown.
[0039] Refer below Figure 1 to Figure 16 A control device for a microgrid inverter, a control method for a microgrid inverter, and a microgrid inverter according to embodiments of the present invention are described.
[0040] figure 1 A block diagram showing a control device for a microgrid inverter according to an embodiment of the present invention, figure 2 A schematic diagram of a topology structure of a microgrid inverter according to an embodiment of the present invention is shown.
[0041] refer to figure 1 , according to the embodiment of the present invention, the microgrid inverter control device includes: a detection unit 100 , a double closed-loop control unit 200 and a driving pulse signal generation unit 300 .
[0042] refer to figure 2 , the microgrid inverter includes a power device 400, a reacto...
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The invention provides a control method and device of a microgrid inverter and a microgrid inverter. The microgrid inverter comprises a power device. The control method comprises the steps of: a stepof detection: detecting an output voltage, a working voltage and a working current of the microgrid inverter in an off state of the microgrid; a step of double closed-loop control: based on the outputvoltage, the working voltage and the working current of the microgrid inverter, executing double closed-loop control through a PI regulator and a resonance controller which are connected in parallel;and a step of diving generation of a pulse signal: generating a drive pulse signal used for controlling the power device according to the result of the double closed-loop control to allow the microgrid inverter to output power consistent to the load of the microgrid. The control method and device of the microgrid inverter and the microgrid inverter can improve the capacity of the microgrid inverter with an unbalanced load.
Description
technical field [0001] The present invention generally relates to the field of new energy technology, and more specifically, relates to a control method, a control device and a micro-grid inverter for a micro-grid inverter. Background technique [0002] A microgrid is a system unit composed of a group of control devices, energy storage devices, loads and micro power sources, supplying electric energy to the loads. A microgrid can either be connected to an external grid or run in isolation. In a microgrid, it is usually necessary to access an external grid or load through a microgrid inverter (ie, a power electronic converter). [0003] Usually, microgrid inverters use droop control to realize functions such as off-grid support voltage and frequency, and grid-connected power regulation. However, the droop-controlled microgrid inverter responds quickly, lacks rotating devices to provide moment of inertia, and the output frequency is sensitive to load fluctuations; moreover, ...
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IPC IPC(8): H02J3/38H02J3/26
CPCH02J3/38H02J3/26H02J3/388Y02E40/50
Inventor 秦承志赵帅央
Owner BEIJING ETECHWIN ELECTRIC