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Micro-grid multi-master-slave mixed control method based on improved droop control

A hybrid control and micro-grid technology, which is applied to AC networks, electrical components, circuit devices, etc. with the same frequency from different sources, can solve the problems of system frequency offset, difficult power rapid distribution, etc., and achieve smooth system operation and improve The effect of adaptability and stability

Inactive Publication Date: 2016-04-20
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional droop control is difficult to achieve fast power distribution due to the influence of lines, etc., and a large load will cause system frequency deviation, so it is necessary to improve droop

Method used

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  • Micro-grid multi-master-slave mixed control method based on improved droop control

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Embodiment

[0029] For inverters whose line impedance is mainly inductive, the distributed power output in the microgrid has a linear relationship between P-f and Q-U (that is, P-f and Q-U characteristics). Through this relationship, the output power of parallel distributed power can be reasonably distributed. From this, the traditional droop control relationship can be obtained as:

[0030] f=f n +m(P n -P)(1)

[0031] U=U 0 -nQ(2)

[0032] Where: f n is the rated value of grid frequency; P n is the output active power of the micro power supply at the rated frequency; U 0 The reactive power output for the micro power supply is 0 (that is, Q n =0) when the voltage amplitude; P, Q are respectively the measured values ​​of the inverter power output active and reactive power; m, n are active and reactive droop coefficients, the calculation formula is:

[0033] m = f n - ...

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Abstract

The invention relates to a micro-grid multi-master-slave mixed control method based on improved droop control. A plurality of distributed power supplies DGs in a micro-grid are controlled by adopting a master-slave control method, wherein the DGs are connected with an alternating-current bus respectively. The micro-grid multi-master-slave mixing control method is characterized in that according to the master-slave control method, the improved droop control is performed on a master control DG; a frequency difference f-fn and a voltage difference U-U0 are used as feedback signals and are added into f and U respectively, wherein f, fn, U and U0 are of master control DG output frequency, a grid frequency rated value, master control DG output voltage and an output voltage amplitude when master control DG output reactive power is 0 respectively. Compared with the prior art, the master control DG adopts the improved droop control and the frequency difference f-fn and the voltage difference U-U0 are used as the feedback signals; a PI link is increased on the feedback signals and a droop coefficient is amplified and corrected; the compensation effect of a feedback link is amplified and rapid power compensation of load changes in a system is realized; the adaptability and stability of the system can be improved; a control strategy does not need to be changed and the system is operated smoothly.

Description

technical field [0001] The invention relates to a microgrid control method, in particular to a microgrid multi-master-slave hybrid control method based on improved droop control. Background technique [0002] In recent years, with the development of economic express delivery, one-time energy consumption has increased, and environmental problems have become increasingly prominent. Microgrids that use advanced power electronics technology to integrate wind power generation, photovoltaic power generation, and energy storage batteries have emerged as the times require. The microgrid can overcome the random and intermittent defects of distributed power generation to a certain extent, make more reasonable and effective use of distributed power generation, improve energy utilization, and solve the power supply problem in remote areas. However, the micro-grid contains multiple distributed generation (DG or micro-power), and each DG needs to be reasonably coordinated and controlled, ...

Claims

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Application Information

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IPC IPC(8): H02J3/06H02J3/38
CPCH02J3/06H02J3/381H02J3/388H02J2203/20Y02P80/14
Inventor 程启明褚思远杨小龙张强黄山张海清
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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