Study on VSCF wind power generation system control based on DSP

Wind power generation technology, as one of the methods of utilizing wind energy, has become increasingly mature, and its economic benefits have approached those of conventional energy sources, which has great development potential. The intelligent wind power control system of the Internet of Things is an intelligent wind power control system based on the wind power microcomputer control system, which adopts the Internet of Things technologies such as wireless sensor network, cloud computing, ZigBee network protocol and Tinyos operating system for secondary development. In this system, wireless sensor nodes are deployed on the fan to connect with the sensors inside the fan. The intelligent acquisition module in the node system software collects the running environment and running state data of the fan in real time, and the FUT-STAR cloud computing Internet of Things platform is used to realize system integration and data communication. The "real-time, remote and intelligent" supervision and control of the running state of wind power system can be realized through terminals such as mobile phones or PCs, and the safety and reliability of wind power system operation can be improved.

The new energy research and development of the development and utilization of wind power system is the focus and hot spots of the world. DFIG (Double-fed Induction Generator) has become the main object of wind power research with its unique operating characteristics. Decoupling Control of Active Power and Reactive Power of Doubly-Fed Machines is a Key Issue in the Research and Development of Wind Power Generation Technology. In this paper, the dual-PWM converter controlled variable speed constant frequency power generation system, the use of wind energy under different wind speeds, combined with the maximum wind energy tracking, to improve the traditional controller performance[1]. The stator flux-oriented DFIG generation vector control strategy with adaptive proportional resonance (PR) is proposed. The power decoupling regulation is realized by controlling the frequency, phase and amplitude of rotor current. The modeling and simulations of the DFIG power generation operation control system are carried out by Matlab. The results verify the correctness and effectiveness of the strategy and control method.

When doubly fed wind power generation system transmits power to power grid through the series compensation, once the external disturbances is close to the natural sonant frequency, there is a trouble of synchronous oscillation between the rotor side and the series capacitor. The paper analyzes the condition of resonance and its mechanism. According the actual argument provide by north china wind power plant, we use PSCAD to build a 1.25MW doubly fed wind power generation model to analyze the synchronous oscillation. We adopt time-domain simulation method to analyze that as the change of series compensation degree the system subsynchronous resonance frequency changes as well as the influence to doubly fed fan current and power. The simulation result is basically the same as the fault wave record monitoring data result of actual site when wind power plant take off the network .Consequently to verify the validity of the simulation platform. To verify the improvement of the converter control strategy to build simulation platform.

Like conventional power plants, wind power plants must provide the power quality required to ensure the stability & reliability of the power system. Increasing amount of wind turbine are connected to electrical power system in order to mitigate the negative environmental consequence of conventional electricity generation. While connecting wind turbine to grid it is important to understand source of disturbance that affect the power quality. In general voltage & frequency must be kept as stable as possible. This stability can be obtained by using FACTS devices. Recently voltage-source or current-source inverter based various FACTS devices have been used for flexible power flow control, secure loading and damping of power system oscillation. Some of those are used also to improve transient & dynamic stability of wind power generation system (WPGS). In this paper, we propose the static reactive compensator (STATCOM) based on voltage source converter (VSC) PWM technique to stabilize grid connected squirrel cage wind generator system. A simple control strategy of STATCOM is adopted where only measurement of rms voltage at the wind generator terminal is needed, there is no need of reactive power measurement. Fuzzy logic controller is used as the control a methodology of STATCOM, rather than conventional PI controller. The voltage sag and swell improvement of WPGS is compared with both fuzzy and PI controller. Moreover, the steady state capacitor value used with induction generator reduced by certain percentage when STATCOM is used with WPGS.

This paper presents the development of the wind power system and low voltage ride through (LVRT) techniques for doubly -fed induction generator (DFIG) wind energy system. In recent years, wind power has been developing rapidly. As the wind power penetration from large scale wind turbines has been increasing rapidly in the transmission system, there is a higher requirement for the frequency stability and power generation efficiency of the wind power generation system, and the power grid puts forward higher continuous operation requirements for the grid connected wind turbine in the power grid fault and demand that the wind power generator has to ride through the grid faults, especially the grid voltage dips. This overview mainly introduces DFIG and low voltage ride through technology in the wind power generation system. This paper introduces respectively their development, control strategies and future trend.

Optimization of wind power generation to minimize operation costs in the daily scheduling of hydrothermal systems

Wind power generation technology is developing rapidly on a global scale. In many wind power generation systems, which we use most commonly is the double-fed wind power generation system. This paper mainly focuses on the power relationship, modeling and simulation of the double-fed wind power generation system. First, based on the equivalent circuit diagram, this paper analyses double-fed induction generation (DFIG) operation theory and DFIG power relationship. Then, builds the model of double-fed wind power generation system. Finally, use PSCAD to simulate the double-fed wind power generation system, which proves the validity of DFIG output active and reactive power decoupled control and the maximum wind power tracking control.

This study presents a technoeconomic analysis of a hybrid wind‐PV (photovoltaic) power plant (HPP) compared to onshore wind power plants (WPPs) and photovoltaic power plants (PVPPs) in the Nordic electricity market, focusing on locations in Finland and Sweden. Wind power capacity has recently increased significantly in the Nordics, increasing the profit cannibalization of wind power. Renewable energy subsidies have been phased out in Finland and Sweden, thus new wind and PV power value creation is formed from the power market. The PV power capacity has also encountered significant growth in the Nordics. However, the capacity is still relatively low, allowing more revenue for produced PV power compared to wind power. The lower PV power profit cannibalization has increased interest in HPPs instead of WPPs. This contribution studies the economic feasibility of wind and PV power in changing market conditions in the Nordic electricity market. The market operation is modeled with three different configurations including selling all the power into the day ahead spot market and baseload or pay‐as‐produced power purchase agreement (PPA). In addition, a battery energy storage system (BESS) investment is analyzed using the operating strategy of shifting production to more profitable spot price hours. This study shows that due to the profit cannibalization and high cost of capital, the power plants are currently not profitable in the Nordic electricity market except when the bidding area has high average spot prices. The worst profitability was with WPPs when exposed to the market shape risk and with PVPPs when pay‐as‐produced PPA was agreed upon due to the higher levelized cost of electricity. However, the PV power profit cannibalization is expected to increase in the future as more PVPPs operate in the Nordic power market. Thus, the PVPP shape risk may increase in the future as well.

Wind energy is one of the primary energy sources that can be used to produce electricity. Indonesia has the potential to harness wind energy to produce electricity due to located on the equator, especially in coastal areas. An alternative to the availability of electricity in remote coastal areas is to use small-scale wind power plants. One component that plays an important role in wind power generation systems is the generator. A generator is a machine that converts mechanical energy into electrical energy. In small scale wind power plants, permanent magnet synchronous generators (PMSG) are commonly used as energy conversion machines. In this paper, a PMSG has been designed for small-scale and low-speed wind power generation as an energy conversion machine. PMSG which has been designed has the following specifications: 500 W, three phases, 18 slots, 12 poles, with a rotation speed of 500 rpm. The simulation test results obtained the following data, the output phase-phase maximum voltage of the generator is 38.84 V, and phase maximum voltage is 22.5 V.

Difference between grid connections of large-scale wind power and conventional synchronous generation

This paper reports implementation of Battery Energy Storage System (BESS) for Switched Reluctance Generator (SRG) based wind power generation system supplying stand alone load. MATLAB/Simulink model of the SRG machine is developed using the characteristics acquired by solving the Finite Element Analysis (FEA) model of the machine used for implementation. Wind turbine is incorporated with Maximum Power Point Tracking (MPPT) control technique and to mitigate the problem of wind power fluctuation a BESS for a wind powered SRG with Isolated Bi-directional DC-DC Converter (IBDC) is proposed. The response of BESS is evaluated using MATLAB/Simulink computing tool and the results are reported. For experimental purpose, the wind turbine is emulated by a 12V DC motor. The BESS for wind powered SRG is analyzed and implemented using microcontroller to validate the simulation results.

Energy storage system is an effective means to overcome the fluctuation of wind power generation and improve electrical network stability. This paper briefly introduces the impact of wind power generation on the grid and different battery energy storage technologies first. Demonstration projects of combined wind power generation and energy storage systems is then discussed. This is followed by an outline of three main operating modes of the combined wind power generation and energy storage using batteries, including smoothing wind power fluctuation, tracking wind power schedule output and load shifting. Current status of control strategies and storage capacity for the combined wind power generation and energy storage systems are then presented. Finally, further research needed for the combined system is discussed and improvement on the economic aspects is concluded to be a key aspect for future research.

The paper offers a wind turbine training system, which has supervisory layer and control layer. The supervisory layer is based on American NI Company's graphical software-LabVIEW to set up the monitoring interface. The control layer is based on Matlab/Simulink software to simulate the wind power generation system model. With researching the mathematic model of wind turbine and analyzing control strategy of Double-fed induction generator, a variable-speed constant-frequency (VSCF) wind power generation training system is presented. The main operations of wind power generation system have been implemented including cutting-in control, maximum power point tracking (MPPT) at low wind speed and power control/variable pitch control at the rated wind speed. The corresponding curves in simulink and LabVIEW platforms are acquired. And by comparing them the correctness and feasibility of the training system are proved.

This research provides an overview of Iraq's renewable energy prospects. One of the most important sorts of renewable energy resources in the world is wind energy. Wind energy is considered environmentally beneficial and very economical. These benefits are cited as the primary reasons for using wind turbines to generate power across the world. An assessment of the country's profile has been made, taking into consideration existing energy generation, crude oil production at current levels, gas flares that generate CO2 emissions, as well as industry, human activities, and grid electricity distribution. Iraq has power shortages, and several obstacles must be solved in order to satisfy projected increases in electrical demand. This analysis discovered that solar, wind, and biomass energy are now underutilized, but that they might play a key part in Iraq's sustainable energy future. Wind energy, for example, has become an important aspect in reducing pollution and improving air quality. The usage of tiny wind turbines to generate power under Iraqi meteorological conditions is examined in this study. The research evaluates the wind system that is necessary to provide electric power for highway services including lighting and parking. According to the study's findings, wind turbines can be used effectively for roadway illumination. The efficiency of a maximum wind turbine is determined by the blade design. For the planned use, the wind speed reported in Iraqi winter is pretty acceptable. Alternative and sustainable energy, wind energy, Iraqi climate are all index terms. The Iraqi government recently joined the Paris Climate Agreement and is now starting to encourage the participation of small and large consumers to generate electricity from renewable energy sources. This article analyzes the hybrid electrical system of solar and wind energy for the city of Dohuk, the northern part of Iraq, to find out the feasibility of this system compared to the local electrical network. First, access to solar and wind energy resources in Dohuk were ensured.

The grid system operators in many countries require a grid code for a wind power generation system (WPGS) or a wind power plant (WPP). For satisfying the grid code, a wind power plant control system (WPPCS) is needed because it requires the possibility for controlling active and reactive power in point of common coupling (PCC). The WPPCS should have the ability to send out set points to all WPGSs, and each WPGS must be able to ensure set points from the WPPCS. This chapter presents a performance analysis method without a real WPP to evaluate a WPPCS using hardware-in-the-loop simulation (HILS) using a real-time digital simulator (RTDS). A HILS method for a WPPCS using a RTDS is presented, and performance of the WPPCS is analyzed. A 50-MW WPP which includes 5 MW WPGS is modeled and analyzed in RSCAD/RTDS. A prototype WPPCS is developed to control and operate a 50-MW class WPP, which is connected to the RTDS through the Distributed Network Protocol (DNP)3.0. The HILS results show the proposed method can be effectively utilized to validate control functions of WPPCSs.