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This paper proposes a new control scheme for a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS). In this scheme, the generator and grid currents are controlled using a hysteresis current controller (HCC). The control system of the back-to-back converter based on the HCC is described. Modeling and simulation of the system are developed using Matlab/Simulink to...
A coordinated pitch and generator control strategy is presented in this paper in order to realize flexible power tracking of wind turbine. With the proposed method, the output power of wind turbine can be regulated flexibly by pitch control system and/or the generator control system according to the dispatch command, in order to ensure the steady-state power balance of the local grid and play an active...
Hydraulic wind power transfer systems deliver the captured energy by the blades to the generators through an intermediate medium i.e. hydraulic fluid. This paper develops a control system for an experimental setup of hydraulic wind power transfer systems. To maintain a fixed frequency electrical voltage by the system, the generator should remain at a constant rotational speed regardless of the wind...
Wind energy, as an important part of the new energy, is a power generation of the most mature technology, the most commercial development conditions and broad prospects in the new energy fields. As an important part of the wind turbine, therefore its control system has also been full attention of the world, and it has become a hot topic. Wind turbine control system has become a major problem if wind...
The need for an emergency braking system for the wind turbine is discussed in this paper. This system should be installed as the addition to a general control system. To solve the problem of emergency braking we propose an electromechanical device. It is equipped with electric and manual drives. The assembly with small outline dimensions transmits a high braking torque value due to the specific kinematic...
Battery energy storage systems (BESSs) have been widely used to minimize wind power fluctuations in microgrids. BESSs control systems are usually based on vector-controlled techniques with inner current control loops and outer control loops. Owing to the complexity of a control system, it is difficult to apply additional functions such as predicting wind power. This paper presents a detailed description...
This paper demonstrates a combined control system for grid connected Doubly Fed Induction Generator (DFIG) based wind turbine and few water electrolyzers connected to the output of this wind turbine. DFIG is getting popularity for modern high power and variable speed wind farms. Renewable hydrogen is a modern concept to minimize the cost of production of hydrogen, which is usable in fuel cell. The...
Renewable energy has to perform pivotal role in the development of present world as the globe has limited amount of fossil fuel. Wind energy is one of the prospective clean energy to provide reliable power but the intermittent nature of wind generation makes its operation and planning a major challenge to use wind as a source of power. In order to develop power system stability, it is essential for...
An optimal wind power curtailment strategy considering operation capacity credit is proposed in this paper to minimize the uncertain wind power curtailment and minimize the system operation cost. The relevant definitions in capacity credit assessment are applied in the power system operation situation. Based on operation capacity credit prediction, the optimal operation control strategy is defined...
This paper discusses the overall volume evaluation of capacitors in Modular Multilevel Converter (MMC). First, a theoretical formula of the ripple voltage on each cell capacitor in the MMC is clarified. Second, a formula of the total electrostatic energy is clarified. As a result, it is difficult to evaluate the overall volume of the capacitors because the total electrostatic energy is constant even...
Variable pitch control technology is one of the key technology of wind power generation technology. This paper has studied the pitch control system of wind turbine and the variable pitch power control strategy for wind turbine. Based on the control system and control strategy, Hydraulic variable pitch control system model is established, and build a variable pitch wind turbine system. Then, it has...
The paper analyzes the capability of a wind power plant, based on doubly-fed induction generators (DFIGs) with an improved control system, to fulfill low voltage ride-through (LVRT) capability of the wind turbines providing the reactive power support. According to grid code requirements, tripping of wind generators under grid faults is not allowed. The sensitivity of DFIGs to grid faults requires...
This paper discusses a AC-DC converter which is constructed by a Modular Multilevel Converter (MMC) for a wind power generation system connected to Micro-grid. The proposed system which is constructed the MMC with an H-bridge cell achieves to convert from a generator voltage of 3.3 kV into DC bus voltage of 340 V. Moreover, as a fundamental evaluation, the experimental result by miniature model of...
Hydraulic wind power transfer systems deliver the captured energy by the blades to the generators differently and through an intermediate medium i.e. hydraulic fluid. This paper develops a control system for a nonlinear model of hydraulic wind power transfer systems. To maintain a fixed frequency electrical voltage by the system, the generator should remain at a constant rotational speed. The fluctuating...
A new control system for a wind farm consisting of series connected wind generators and a current-source thyristor inverter is proposed. In this type of wind farm since the rectified outputs of all generators are connected in series, the armature currents of all generators become the same. So, it is hard to keep the tip speed ratios of individual turbines constant for any cases of wind conditions...
This paper describes the performance of permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS) using modified hill climb searching (HCS) Maximum Power Point Tracking (MPPT) algorithm. The proposed system consists of back to back sinusoidal pulse width modulation (SPWM) converters. The generator side converter is used to track the maximum wind power using modified...
The purpose of integrating a battery energy storage system (BESS) with large scale wind farms is to compensate the intermittency of the wind power and also to make wind farms more dispatchable and competitive against the conventional power plants. This paper presents a novel wind power dispatch control scheme with a BESS based on model predictive control to manage the amount of energy generated and...
A transformerless wind power generator concept with the potential to achieve 100 kV DC output is introduced in this work. The work is presented in two papers. Part I: The Generator, describes the electrical machine properties of the special, 10 MW generator. This part, Part II, presents a modular AC/DC-converter system suitable for this wind turbine drive train solution. A conceptual description of...
Due to the complexity and non-linearity of the pitch control system, the pitch angle could not be controlled accurately by traditional PI control. To solve the problem, a prediction-correction pitch control strategy is proposed in this paper. The strategy first processes the wind speed by moving average method, and then gets the prediction value of pitch angle by using wind speed-pitch angle curve-fitting...
This paper present stabilization control of fixed speed wind generator by using variable speed permanent magnet wind generator in a wind farm connected with multi-machine power system. A novel direct-current based d-q vector control technique of back to back converter integrated with Fuzzy Logic Controller for optimal control configuration is proposed, in which both active and reactive powers delivered...
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