scholarly journals A UNIFIED DROOP CONTROL STRATEGY FOR DC BUS VOLTAGE REGULATION AND MPPT CONTROL OF MULTI INPUT BI-DIRECTIONAL DC-DC CONVERTER IN AC-DC-MICROGRID

2020 ◽  
Vol spl5 (1) ◽  
Author(s):  
T Narasimha Prasad
Keyword(s):  
Control Strategy ◽  
Voltage Regulation ◽  
Droop Control ◽  
Dc Microgrid ◽  
Dc Bus ◽  
Bus Voltage

scholarly journals Research on Bus Voltage Control Strategy of Off-grid DC Microgrid

2020 ◽  
Vol 185 ◽  
pp. 01064
Author(s):  
Yilonɡ Kanɡ ◽  
Ningkang Zheng ◽  
Xiangyang Yan ◽  
Huanruo Qi ◽  
Kai Li
Keyword(s):  
Control Strategy ◽  
High Reliability ◽  
Voltage Control ◽  
Droop Control ◽  
Voltage Control Strategy ◽  
Dc Microgrid ◽  
Voltage Quality ◽  
Dc Bus ◽  
Bus Voltage

It is important to achieve stability of bus voltage in control of DC microgrids. In the DC microgrid, the traditional droop control method is usually adopted to stabilize the bus voltage for its high reliability and cost-effectiveness. However, line resistance will reduce the voltage quality of the DC bus in actual situations. In order to improve the voltage quality of the DC bus, a novel bus voltage control strategy based on modified droop characteristic is proposed. Finally, the simulation model of the off-grid DC microgrid with improved droop control strategy is built on PSCAD/EMTDC platform, and the results verify the effectiveness and feasibility of the proposed control strategy.

scholarly journals The Hierarchical Control Algorithm for DC Microgrid Based on the Improved Droop Control of Fuzzy Logic

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2995 ◽  
Author(s):  
Liang Zhang ◽  
Kang Chen ◽  
Shengbin Chi ◽  
Ling Lyu ◽  
Guowei Cai
Keyword(s):  
Fuzzy Logic ◽  
Control Algorithm ◽  
Voltage Drop ◽  
Hierarchical Control ◽  
Voltage Regulation ◽  
Droop Control ◽  
Dc Microgrid ◽  
Current Sharing ◽  
The Difference ◽  
Bus Voltage

In the direct current (DC) microgrid composed of multiple distributed generations, due to the different distances between various converters and the DC bus in the system, the difference of the line resistance will reduce the current sharing accuracy of the system. The droop control was widely used in the operation control of the DC microgrid. It was necessary to select a large droop coefficient to improve the current sharing accuracy, but a too large droop coefficient will lead to a serious bus voltage drop and affect the power quality. In view of the contradiction between the voltage regulation and load current sharing in the traditional droop control, a hierarchical control algorithm based on the improved droop control of the fuzzy logic was proposed in this paper. By improving the droop curve, the problems of voltage regulation and current sharing were solved simultaneously. The effectiveness of the algorithm was verified by simulation.

scholarly journals Adaptive Droop Control of a Multibus DC Microgrid Based on Consensus Algorithm

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Mingche Li ◽  
Jiangwei Fan ◽  
Lihui Qiao
Keyword(s):  
Control Strategy ◽  
Multiagent System ◽  
Consensus Algorithm ◽  
Power Balance ◽  
Droop Control ◽  
Regional Power ◽  
Consensus Protocol ◽  
Dc Microgrid ◽  
Control Objective ◽  
Bus Voltage

The main control objective of a DC microgrid with a multibus structure is to stabilize the bus voltage and maintain the power balance of the whole system. An adaptive droop control strategy for multibus DC microgrid based on consensus algorithm is proposed. It is based on platform multiagent system, which is realized by network protocol. Under the condition of a weak communication network, the bus at all levels can realize regional power autonomy through packet consensus protocol. A hybrid simulation platform composed of Jade, MacSimJX, and Simulink is built to verify the effectiveness of the control strategy.

scholarly journals Inertial and Damping Characteristics of DC Distributed Power Systems Based on Frequency Droop Control

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2418 ◽  
Author(s):  
Liancheng Xiu ◽  
Liansong Xiong ◽  
Ping Yang ◽  
Zhiliang Kang
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Control Strategy ◽  
Power Grid ◽  
Voltage Control ◽  
Droop Control ◽  
Damping Effect ◽  
Distributed Power Systems ◽  
Dc Bus ◽  
Bus Voltage

With high penetration of renewable energy, DC distributed power systems (DDPSs) need to improve the inertia response and damping capacity of the power grid. The effects of main circuit parameters and control factors on the inertia, damping and synchronization of the DDPS were studied in this paper. Firstly, the dynamic model of DDPSs based on frequency droop control is established in the DC voltage control (DVC) timescale. Then, a static synchronous generator (SSG) model is used to analyze the parameters that affect the inertial level, damping effect and synchronization capability of the DDPS. The analysis results show that an optimal design of the frequency droop coefficient and proportional integral (PI) parameters of the DC bus voltage control loop can equivalently change the characteristics of inertia and damping when the frequency droop control strategy is applied to the DC/DC converter and the DC bus voltage control strategy is used in the grid-tied inverter. Simulation results verify the correctness of the conclusions. This paper helps to design an effective control strategy for DDPSs to enhance the inertial level and damping effect of the power grid and to improve the stable operation capability of renewable energy systems.

scholarly journals Bidirectional DC/DC and SOC Drooping Control for DC Microgrid Application

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 225
Author(s):  
Chunjiang Zhang ◽  
Pengcheng Li ◽  
Yingjun Guo
Keyword(s):  
Energy Storage ◽  
Power Index ◽  
Droop Control ◽  
Distributed Energy ◽  
Dc Microgrid ◽  
Distributed Energy Storage ◽  
Dc Bus ◽  
Bus Voltage ◽  
Communication Lines ◽  
Storage Units

In DC microgrids, distributed energy storage plays a key role in stabilizing the DC bus voltage. The bidirectional DC/DC converter in the distributed energy storage system should be designed according to the voltage level and electromagnetic isolation requirements, and multiple energy storage units should be coordinated for load current distribution according to the state of charge (SOC). This paper proposes a SOC power index droop control strategy by communication lines to coordinate the fast and high-precision distribution of load current among multiple energy storage units, and the SOC between energy storage units quickly converges to a consistent state. Considering that communication lines are susceptible to interference, this paper further proposes an improved SOC power index droop control to overcome the effects of communication line failures. Considering the high cost of the energy storage unit, it should be connected to the DC microgrid in layers to achieve a reasonable allocation of resources in practical applications. In order to provide high-quality power to a large power grid, the quantification standards of the DC bus fluctuation range and the working range of each converter are further discussed to maximize the stability of the DC bus voltage and grid-connected power fluctuation.

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