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This paper design a simple initial rotor position detection method which is both suitable for surface Permanent Magnet Synchronous Generator(PMSG) and interior PMSG in wind power system which is not need keep still before generator start. Based on the field oriented control, this strategy can be easily applied to PMSG speed sensorless drive system without extra complexity and independent to generator...
This paper analyzes the stator flux oriented vector control theory for doubly fed induction generator, control strategy of grid connected based on speed feedback and the arithmetic of tracking the peak power independent of the turbine characteristics and air density are used in this system. a principle of power characteristic for variable speed wind power generation systems is first explained. To...
A utility-connected wind-power generation scheme using permanent magnet synchronous machines (PMSMs) in conjunction with a direct AC-AC matrix converter is proposed. The matrix converter converts the high-frequency of a micro-turbine generator to a conventional frequency of the utility system, based on a novel switching strategy. The control algorithm regulates magnitude and phase-angle of the converter...
Converter system plays an important role in power drive train of a wind turbine. In order to achieve higher reliability, the modular concept is popularly utilized in converter system design in modern wind turbines. A converter module can be a channel composed of AC/DC/AC or a module composed of AC/DC or DC/AC. AC/DC module can be used on either generator side or grid side which depends on system operation...
This paper proposes a robust control strategy of the PMSG wind power system for the grid voltage sag. The DC-link voltage control is achieved by the generatorside converter instead of the grid-side converter. Considering the nonlinear relationship between the generator speed (ωm) and DC-link voltage (vdc), a DC-link voltage controller is designed using feedback linearization technique. The grid-side...
Due to the inherent complexity, traditional ant colony optimization (ACO) algorithm is inadequate and insufficient to the reactive power optimization for distribution network. Therefore, firstly the ACO algorithm is improved in two aspects: pheromone mutation and reinitialization strategy. Then the thought of DE is proposed to be merged into ACO, and by producing new individuals with random deviation...
Multi-module cascaded multi-level inverters are more and more widely used in high voltage and large power industrial applications. Its unique topological structure requires multi-channel drive pulse. Therefore, generating multi-channel drive pulse becomes one of the key issues. This paper presents a digital implementation method, which combines double and multicarrier horizontal phase shift PWM modulation...
With increased wind power penetration level, new grid codes generally require the wind power system be able to stay connect during a grid voltage sag. Voltage sag generator (VSG) is a kind of device used to simulate the fault condition so as to verify the reliability and stability of wind power system during low voltage ride-through (LVRT). Firstly, two existing VSG topologies which are based on the...
In order to research the actual state of the wind power generation in the laboratory, a 22KW wind power generation experimental platform using SCIG was developed. The platform includes: wind simulator, L-speed gear box, back-to-back converter, filter inductor and a 10-ton platform base. The wind simulator is composed by ABB's ACS550 inverter, three-phase squirrel-cage induction motor and reduction...
Recently more attention has been paid to the distributed power systems due to their high flexibility and reliability. The high speed permanent magnet (PM) generator driven by micro-turbine has been widely investigated since it has small size, high efficiency and power density. The output high frequency AC power of the high speed PM generator needs to be converted into the AC power with constant frequency...
The introduction of distributed generation will bring new challenges to the theory of power electricity market. The problem of loss allocation is one of them. Firstly, a loss allocation method is presented for power distribution network with distributed generation. Secondly, the changes of loss allocation which introduction of distributed generation before and after brings about are analyzed and compared...
With the single unit capacity of wind power is increasing, the grid-connection impact current can't be neglected now, that the grid-connection control technology should be had an in-depth study. In this paper the vector control based on the stator flux-oriented is transplanted to the grid-connection control, the no-lode grid-connection control strategies of AC excitation wind power generator is established,...
This paper extends the highly versatile method, known as the Plug-in Modeling Technique(PMT) to several FACTS devices, such as TCSC, SVC and TCPS, and a new type of generator, i.e. DFIG type of wind turbine generator. A case study to illustrated the FACTS and DFIG type of wind turbine is demonstrated.
Based on analysis of off-grid wind power system characteristics, a maximum power point tracking (MPPT) control strategy is investigated. The new control strategy employs double grey relation analysis (GRA) for maximum power extraction. The first GRA is used the generator output voltage to estimate the maximum power under various wind speed. Then the second GRA is used to estimate the convert duty...
Wind farms are confronted with increasing demands for power quality and fail-safe operation at grid fault. State-of-art techniques applied to meet low voltage ride-through (LVRT) requirements for fix speed wind farms are blade pitching and dynamic reactive power compensation. Besides, breaking resistor and energy storage unit is also helpful to LVRT performance. However, these approaches have their...
Islanding protection is a necessity for grid-connected inverters in distributed generation systems. Diversified anti-islanding algorithms have been developed for the single-unit grid-connected inverter system in the past few decades. However, few literatures demonstrate a clear verification of the effectiveness under the multi-inverter circumstance. The objective of this paper is to present a novel...
Aimed at the application of directly driven PMSG (Permanent Magnet Synchronous Generator) in MW wind power system, a strategy of compound vector control with the orientation at the direction of stator current is proposed in this paper. This strategy adopts the MTCRC (Maximum Torque / Current Ratio Control) mode to perform normal power generation within the range between the cut-in speed and a turning...
Kinetic hydropower system (KHPS) is an energy conversion system that utilizes river, marine or tidal current without the involvement of a dam. Efficiency is a key factor that affects the energy extraction and annual energy production of KPHS. This paper presents a method to evaluate the energy efficiency of various kinetic hydropower systems. The proposed calculation method can contribute to a design...
One of the most important issues in the development and utilization of wind-based distribution generation is to quantify the impact of wind power on distribution system reliability. This paper proposes how to deal with wind generators connected to sub-feeders of distribution system in reliability evaluation by means of the network-equivalent approach. The random nature of wind power, which is quite...
In order to make up for the deficiencies of centralized power production and distant transmission, microgrids become a hot topic of research in distributed energy systems in recent years. And they will play an important role during development of sustainable energy, electric utility deregulation and restructuring efforts. Microgrids, which include various distributed energy resources and controllable...
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