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Low-delay robust power droop multi-loop control method

A technology of power drooping and multi-loop control, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of poor robustness of equivalent connection impedance and affecting power distribution accuracy, etc.

Active Publication Date: 2015-04-29
ZHANGZHOU KEHUA TECH CO LTD
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  • Application Information

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Problems solved by technology

However, due to factors such as line impedance parameter drift and acquisition errors, it is a very harsh condition to accurately design the equivalent output impedance of the inverter, and the quality of the virtual impedance design directly affects the accuracy of power distribution, and power distribution is still insensitive to the equivalent connection impedance. Poor stickiness

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Embodiment Construction

[0044] like figure 1 As shown, a multi-inverter parallel system in an embodiment of the present invention includes i (i=1, 2, 3...) inverters. The inverter includes a DC energy storage capacitor, an inverter circuit, an LC filter circuit, a phase-locked loop circuit, an A / D sampling circuit, a processor (DSP2812), and a drive protection circuit. The LC filter is connected to the AC bus The input end of the A / D sampling circuit is connected to the LC filter circuit; the processor is connected to the input end of the drive protection circuit, the output end of the A / D sampling circuit, and the output end of the phase-locked loop circuit; The input end of the phase-locked loop circuit is connected to the AC bus; the drive protection circuit drives the inverter circuit. Among them, K i It is the output relay of inverter #i, which controls the switching of micro-source i. is the output voltage of inverter i, U L ∠0 is the common bus voltage during island operation, for U oi...

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Abstract

The invention discloses a low-delay robust power droop multi-loop control method which comprises low-delay robust droop control strategy and a voltage and current dual-loop based on virtual complex impedance. The low-delay robust droop control strategy comprises a low-delay fast power calculation method, a robust droop controller and a restoration mechanism. The low-delay robust power droop multi-loop control method aims at a multi-inverter parallel system of a low-voltage microgrid, and has the advantages of improving the robustness of inverters output power to equivalent output impedance and line impedance, relieving the counterbalance relation of the line impedance and power, achieving the accurate allocation of the load power according to a rated capacity ratio, meanwhile reducing the control hysteresis introduced in power calculation, and improving the real time performance and the dynamics of the system.

Description

technical field [0001] The invention relates to the field of new energy distributed power generation, in particular to a low-delay robust power droop multi-loop control method. Background technique [0002] With the shortage of fossil energy and the resulting environmental pollution, distributed generation (DG) new energy power generation has been widely concerned and applied globally due to its advantages of low pollution, low transmission and distribution loss, and high energy utilization rate. Among them, the micro-grid composed of DG units interfaced with the inverter complements and supports the large power grid, and is an effective method to improve the security and flexibility of the power supply system. However, when the microgrid operates in an isolated island, because the inverter does not have the excellent external characteristics similar to the synchronous generator, it will make it difficult to accurately allocate the active / reactive power of the inverters of t...

Claims

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Application Information

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IPC IPC(8): H02J3/46
CPCH02J3/46
Inventor 罗安周乐明陈燕东陈智勇周小平李鸣慎匡慧敏
Owner ZHANGZHOU KEHUA TECH CO LTD
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