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State-of-charge (SOC)-based improved droop control method for DC microgrid

A technology of DC micro-grid and control method, which is applied in the direction of load balance in DC network, parallel operation of DC power supply, etc. It can solve the problems of different initial charge states, overcharge and overdischarge load current distribution, unevenness, etc., and achieve reduction of busbars Effects of voltage offset, load current balance, and stability improvement

Inactive Publication Date: 2019-05-10
TAIYUAN UNIV OF TECH
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Problems solved by technology

This method solves the problems of overcharge and overdischarge of one group of components and uneven distribution of load current caused by continuous charging and discharging at the same speed when the initial charge states of parallel battery energy storage units are different.

Method used

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  • State-of-charge (SOC)-based improved droop control method for DC microgrid
  • State-of-charge (SOC)-based improved droop control method for DC microgrid
  • State-of-charge (SOC)-based improved droop control method for DC microgrid

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Embodiment Construction

[0026] For ease of understanding, the specific experimental implementation of this method will be further introduced in detail with reference to the accompanying drawings. In this experiment, two sets of storage batteries are connected in parallel, which can be extended to multiple sets in actual use.

[0027] 1. Build to attach Figure 4 The experimental platform is shown. The DC bus voltage, the inductance current and output current of the two battery packs, and the terminal voltage of the energy storage part are sampled through the Hall element and the conditioning circuit, and then input into the DSP.

[0028] 2. If figure 1 As shown, in this method, the photovoltaic array constitutes the distributed energy system of the DC microgrid, the parallel battery pack constitutes the energy storage system, and the resistance acts as the DC load; the bus voltage value of the DC microgrid is used as the feedback value, and the given Combined with the voltage value of the battery,...

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Abstract

With regard to the problem of overcharge and over-discharge due to different initial states-of-charge (SOC) of a DC microgrid during the process of system power supplement or absorption of a pluralityof energy storage units and the defect that the load current of an energy storage system cannot be reasonably allocated in real time by a traditional droop control method, a novel storage SOC index function-based droop control method is research and developed. The difference from a traditional method lies in that a droop coefficient can be changed in real time according to the change of the SOC index function, so that the storage battery SOC and the load current reach a balance state, and the effects of equally dividing the load and prolonging the service lifetime of the storage battery are finally achieved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to an improved SOC-based droop control method for DC microgrids. Background technique [0002] With the continuous application and development of renewable energy, it has become a trend to improve the comprehensive utilization of renewable energy and the overall energy efficiency of the system. The output power of photovoltaic power generation is intermittent, random and fluctuating. If only the adjustment of the photovoltaic power generation system itself will reduce its power utilization rate, it will also limit the flexibility of energy utilization. In order to improve the operating capability of the photovoltaic power generation system, it is necessary to use the energy storage system to compensate the system's deficit or surplus power, so as to smoothly control the output power of photovoltaics, and then meet the requirements of stable operation of the DC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J1/14
Inventor 李岚李冰王浩柴伦
Owner TAIYUAN UNIV OF TECH
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