scholarly journals Finite Control Set Model Predictive Control for Complex Energy System with Large-Scale Wind Power

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Yang-Wu Shen ◽  
Jin-Rong Yuan ◽  
Fei-Fan Shen ◽  
Jia-Zhu Xu ◽  
Chen-Kun Li ◽  
...  
Keyword(s):  
Wind Power ◽  
Control Strategy ◽  
Current System ◽  
Renewable Energy Sources ◽  
Energy System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Complex Energy ◽  
Finite Control ◽  
Grid Side

Complex energy systems can effectively integrate renewable energy sources such as wind and solar power into the information network and coordinate the operation of renewable energy sources to ensure its reliability. In the voltage source converter-based high voltage direct current system, the traditional vector control strategy faces some challenges, such as difficulty in PI parameters tuning and multiobjective optimizations. To overcome these issues, a finite control set model predictive control-based advanced control strategy is proposed. Based on the discrete mathematical model of the grid-side voltage source converter, the proposed strategy optimizes a value function with errors of current magnitudes to predict switching status of the grid-side converter. Moreover, the abilities of the system in resisting disturbances and fault recovery are enhanced by compensating delay and introducing weight coefficients. The complex energy system in which the wind power is delivered by the voltage source converter-based high voltage direct current system is modeled by Simulink and simulation results show that the proposed strategy is superior to the tradition PI control strategy under various situations, such as wind power fluctuation and fault occurrences.

scholarly journals Three-terminal Hybrid HVDC Transmissions Control Strategies for Bundled Wind-thermal Power Plants

2016 ◽  
Vol 10 (1) ◽  
pp. 156-165
Author(s):  
Wu Jiahui ◽  
Wang Haiyun ◽  
Wang Weiqing ◽  
Zhang Qiang
Keyword(s):  
Wind Power ◽  
Power Plants ◽  
Control Strategies ◽  
Thermal Power ◽  
Wind Farms ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Thermal Power Plants ◽  
Power Fluctuation ◽  
Grid Side

This paper evaluates application feasibility of a Hybrid Multi-terminal HVDC system and wind-thermal-bundled plants simulated in DIgSLIENT PowerFactory environment. The proposed hybrid MTDC system consists of two line-communicated converters (LCC), which are connected to both wind farms and thermal power plants, and one voltage source converter (VSC) at the grid side. Control strategies for each converter are designed to handle this system under different disturbance conditions. Simulation results show that the wind power fluctuation can be compensated by the thermal-generated power. Results demonstrate the effectiveness of the proposed control strategies of the hybrid MTDC system compared to a conventional MTDC system. The proposed scheme combines advantages of both LCC and VSC HVDC systems and provides a new way to transmit wind power over long distances to the main grid.

scholarly journals MMC-Based PV Single-Phase System with Distributed MPPT

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3964 ◽  
Author(s):  
Simone Barcellona ◽  
Marzio Barresi ◽  
Luigi Piegari
Keyword(s):  
Control Strategy ◽  
Single Phase ◽  
Low Voltage ◽  
Renewable Energy Sources ◽  
Daily Basis ◽  
Maximum Power ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Phase System ◽  
Partial Shading

The presence and evolution of static power converters in electric grids are growing on a daily basis. Starting from the most used voltage source converter (VSC), passing through the use of multilevel converters, the most recent configuration is the so-called modular multilevel converter (MMC). Because of its intrinsic advantages, it is used not only in high-voltage systems but also in low- and medium-voltage ones to interface renewable energy sources such as photovoltaic (PV) panels. Several configurations and maximum power point tracker (MPPT) algorithms have been proposed and analyzed for MMC-PV-based systems. However, when using distributed MPPTs, partial shading conditions cause a problem. The PV panel can be directly connected to the MMC using its dc link or submodule. Based on this configuration, this paper proposes a novel control strategy that tracks both the ac grid current and ac circulating current for a single-phase low-voltage system to obtain the maximum power under any irradiance condition. The effectiveness of the proposed control strategy is demonstrated through time-domain simulation results.

Control Strategy for VSC-HVDC under Unbalanced Grid Voltages

2017 ◽  
Vol 863 ◽  
pp. 214-219
Author(s):  
Dan Li ◽  
Ting Ting Cai
Keyword(s):  
Reference Frame ◽  
Control Strategy ◽  
Frequency Component ◽  
Positive Sequence ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Negative Sequence ◽  
Dual Vector ◽  
Synchronous Reference Frame ◽  
Grid Side

This paper describes the use of an unbalanced control strategy to solve the faults occur in AC grid side of High voltage direct current based on Voltage Source Converter (VSC-HVDC) system. This method divides the voltage and current parameters into negative-sequence and positive-sequence. It can be obtained that the negative-sequence appears as double-frequency component in the positive-sequence synchronous reference frame; while, it appears as dc component in the negative-sequence synchronous reference frame. To mitigate the unfavourable impact of the unbalance fault, such as the DC link ripples, the dual vector control algorithm in dq synchrounous reference frame is designed. Simulation results demonstrate the validity and the effectiveness of the proposed control scheme.

scholarly journals Grid-connected control of PV-Wind hybrid energy system

2021 ◽  
Vol 12 (2) ◽  
pp. 1228
Author(s):  
Hakim Azoug ◽  
Hocine Belmili ◽  
Fekkak Bouazza
Keyword(s):  
Control Strategy ◽  
Renewable Energy Sources ◽  
Energy System ◽  
Speed Ratio ◽  
Efficient Manner ◽  
Hybrid Energy System ◽  
Hybrid Energy ◽  
Electrical Grid ◽  
Two Systems ◽  
Grid Side

ABSTRACT Article history: Received Oct 14, 2020 Revised Mar 22, 2021 Accepted Apr 23, 2021 This paper presented a strategy for modeling, simulation and control of a hybrid grid connected power system which is in fact a rather complex system. In this work, we study how to use two renewable energies in an efficient manner without any disturbing of the main network. Our hybrid energy system (HES) is composed by two renewable energy sources, the photovoltaic source and wind source. It is better for these two systems to work at their maximum power in order to return the investment cost of the system. The proposed solution is to connect those generators to the electrical grid via the AC bus with trackers. Where the photovoltaic generator (PVG) is followed by a DC/DC boost converter, controlled by a perturb and observe (P&O) tracker, then followed by a three-phase voltage inverter (3-ph-VSI) which is controlled by the watt-var decoupled method. The wind system is based on permanent magnet synchronous machine (PMSM) which is used as a variable speed generator and directly connected to the turbine (without gearbox) followed by back-to-back converters. The grid side converter (GSC) allows us to control the DC bus voltage and unity power factor, while the machine side converter (MSC) ensures us to control the PMSM speed. Knowing that pitch angle control is not considered in our study. The MPPT control strategy, which is based on the optimum peak speed ratio (OTSR), is used to ensure the most energy efficiency despite variations in wind speed. The coupling of the two systems is done via the Point of Common Collecting (PCC). Finally, simulation results show the feasibility of our solution and the good performances of the proposed control strategy, applied for mediumsized HES in power generation. They also demonstrate that such system topology is very advantageous.

scholarly journals Performance of Flywheel Energy Storage System for Fault Ride through Support of Grid Connected Vsc-Hvdc Based Offshore Wind Farms

2020 ◽  
Vol 9 (12) ◽  
pp. 189-192
Keyword(s):  
Power Transmission ◽  
Renewable Energy Sources ◽  
Storage System ◽  
Energy Storage System ◽  
Voltage Source ◽  
Energy Sources ◽  
Voltage Source Converter ◽  
Flywheel Energy Storage System ◽  
Squirrel Cage ◽  
Grid Side

For the sake of uninterrupted power supply to the loads we are using renewable energy sources. Among them wind energy and the solar energy is the most familiar renewable energy sources we are using now-a-days. Voltage source converter based high voltage DC transmission is considered as future of offshore power transmission. This paper proposes the high voltage DC power transmission system and maintains system balance during each faults. This results in the voltage and current losses on the switching devices. This strategy implements the flywheel energy storage system based on a squirrel cage induction machine connected in parallel to the grid side converter. It is connected in shunt which present on the grid side circuit of VSC-HVDC based squirrel cage induction motor. Due to this the FESS stores the trapped energy in the DC link during AC side faults for long transmission system using a voltage source converter. When there is insufficient of fault meet the grid at load demand. The series of simulation results we carried out the main part of theFESS system under fault conditions achieved using the software Matlab/Simulink. This project possesses the dynamic performance during ‘steady state’ during normal and fault operating conditions.

scholarly journals Reliability Assessment of a Multi-State HVDC System by Combining Markov and Matrix-Based Methods

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3097
Author(s):  
Roberto Benato ◽  
Antonio Chiarelli ◽  
Sebastian Dambone Sessa
Keyword(s):  
Current System ◽  
Estimation Method ◽  
Reliability Estimation ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Hvdc System ◽  
Critical Elements ◽  
The Matrix ◽  
The Impact

The purpose of this paper is to highlight that, in order to assess the availability of different HVDC cable transmission systems, a more detailed characterization of the cable management significantly affects the availability estimation since the cable represents one of the most critical elements of such systems. The analyzed case study consists of a multi-terminal direct current system based on both line commutated converter and voltage source converter technologies in different configurations, whose availability is computed for different transmitted power capacities. For these analyses, the matrix-based reliability estimation method is exploited together with the Monte Carlo approach and the Markov state space one. This paper shows how reliability analysis requires a deep knowledge of the real installation conditions. The impact of these conditions on the reliability evaluation and the involved benefits are also presented.

Real power regulation design for multi-terminal VSC-HVDC systems

2013 ◽  
Vol 3 (2) ◽  
Author(s):  
Guo-Jie Li ◽  
Si-Ye Ruan ◽  
Tek Lie
Keyword(s):  
Control Strategy ◽  
Control Mode ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Real Power ◽  
The Real ◽  
Hvdc System ◽  
High Voltage Direct Current ◽  
Power Regulation ◽  
Regulation Functions

AbstractA multi-terminal voltage-source-converter (VSC) based high voltage direct current (HVDC) system is concerned for its flexibility and reliability. In this study, a control strategy for multiple VSCs is proposed to auto-share the real power variation without changing control mode, which is based on “dc voltage droop” power regulation functions. With the proposed power regulation design, the multiple VSCs automatically share the real power change and the VSC-HVDC system is stable even under loss of any one converter while there is no overloading for any individual converter. Simulation results show that it is effective to balance real power for power disturbance and thus improves operation reliability for the multi-terminal VSC-HVDC system by the proposed control strategy.

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