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Island microgrid droop control method based on Logistic exponential function

A control method and technology of micro-grid, applied in the field of micro-grid, can solve the problems that active power or reactive power cannot be allocated reasonably, affect the power quality of micro-grid system, system frequency fluctuation and grid frequency mismatch, etc., and achieve improved droop control Equations, improving power control accuracy, and achieving precise control effects

Pending Publication Date: 2022-07-12
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of droop control are also very obvious. The droop controller reduces the frequency and voltage amplitude in order to simulate the synchronous generator to adjust the power, which will lead to poor system stability, deviation of the frequency and amplitude of the output voltage, active power or reactive power Can not be allocated reasonably, affecting the power quality of the microgrid system
In addition, in traditional droop control, when the load is put in or cut out, the frequency fluctuation of the system will cause the problem of mismatching with the grid frequency

Method used

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  • Island microgrid droop control method based on Logistic exponential function
  • Island microgrid droop control method based on Logistic exponential function
  • Island microgrid droop control method based on Logistic exponential function

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In this embodiment, a method for controlling the droop of an islanded microgrid based on a Logistic exponential function is provided.

[0032] figure 1 It is a schematic diagram of the three-phase inverter system of the island microgrid in Embodiment 1 of the present invention.

[0033] like figure 1 As shown, the droop control method of the island microgrid based on the Logistic exponential function involved in this embodiment includes the following steps:

[0034] In step S1, an islanded microgrid three-phase inverter system is established. The islanded microgrid three-phase inverter system includes a main circuit, a measurement system, a power calculation module, a droop control module, and a voltage and current double closed-loop module.

[0035] Step S2, the measurement system measures the output voltage and output current output by the three-phase inverter of the island microgrid, and after the abc-dq coordinate transformation, the measured output voltage value ...

Embodiment 2

[0052] In this embodiment, a specific application of a droop control method for an islanded microgrid based on a Logistic exponential function is provided. The droop control method of the island microgrid based on the Logistic exponential function in this embodiment is specifically described for two distributed power sources.

[0053] The capacity of distributed power source 1 (DG1) is 10kw+8kVar, and the capacity of distributed power source 2 (DG2) is 20kw+16kVar. The operating time of the microgrid system is 1s, and the entire microgrid is in a no-load operation state within 0 to 0.2s. The first group of loads is 7.5kw+6kVar at 0.2s, and the second group of loads is 10.5kw+12kVar at 0.5s. The first set of loads is removed at 0.8s.

[0054] Image 6 It is the output load current waveform diagram of DG1 in the second embodiment of the present invention.

[0055] like Image 6 As shown, when DG1 is put into the first group of loads at 0.2s in the system, the amplitude of th...

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Abstract

The invention discloses an island micro-grid droop control method based on a Logistic exponential function, and the method comprises the following steps: 1, building an island micro-grid three-phase inverter system which comprises a main circuit, a measurement system, a power calculation module, a droop control module and a voltage and current double-closed-loop module; 2, measuring an output voltage and an output current output by the three-phase inverter of the island micro-grid by a measuring system; step 3, inputting into a power calculation module, and calculating to obtain active power and reactive power output by the inverter in real time; and step 4, inputting into a droop control module to obtain a frequency value and a reference voltage value of the three-phase inverter system of the island micro-grid. Step 5, subtracting the reference voltage value from the output voltage value to obtain a voltage offset, inputting the voltage offset into a voltage and current double-closed-loop module, and processing to obtain a space vector pulse width modulation (SVPWM) wave; and step 6, controlling on and off of a power tube of the system through SVPWM, thereby controlling the output voltage of the system and realizing integral accurate control.

Description

technical field [0001] The invention relates to the field of microgrids, in particular to a droop control method for island microgrids based on a Logistic exponential function. Background technique [0002] Driven by the increasing demand for energy and the urgent need to protect the environment, distributed generation has become a focus of attention in various countries due to its advantages of environmental protection, high efficiency and flexibility. However, distributed generation is often limited by environmental conditions, and the penetration of a large number of distributed generation also adversely affects traditional large power grids. Microgrids can effectively solve these problems. In a microgrid, in order to meet the load's demand for electrical energy, it is necessary to control the output voltage and frequency within the allowable range. The distributed power generation in the island microgrid is usually operated with the inverter paralleling technology base...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/50H02J3/16H02J3/24H02M7/5387H02M1/088G06F17/18
CPCH02J3/388H02J3/48H02J3/50H02J3/16H02J3/241H02M7/53871H02M1/088G06F17/18H02J2203/20Y02P80/14
Inventor 曹璟徐丽李丽花赵峰峰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER