Current situation and development of wind power in China

Bao, Nengsheng; Ni, Weidou

doi:10.1007/s11708-007-0056-4

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…1, Us is the stator-side voltage, is denotes the stator-side current, Ur refers the rotor side voltage, ir represents the rotor-side curr ent, if is the line side three-phase current, Ude is intermediate DC voltage. (1) where x, u, y IS state variables, input and output.. …”

Section: Modeling Frameworkmentioning

confidence: 99%

“…As renewable energy technology already commercially available and with great potential to be further exploited, wind power generation experienced fast development in the last two decades.Variable-speed wind-energy conversion systems (WECS), especially the doubly fed induction generator-based WECS attract big attention for their exclusive advantages [1][2]. Compared with the generator and other mechanical components, the inverter is one of the relatively poor stable links in a wind power system.…”

Section: Introductionmentioning

confidence: 99%

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Open-circuited fault detection on switch of convertor in double-fed wind power generator set based on parameter estimation

Peng

Mao

Han

et al. 2015

2015 Chinese Automation Congress (CAC)

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The reliability of the convertor in double-fed wind power generator set is relatively poor. Once the switch of the convertor fails, the entire wind turbine set may be severely damaged or shut down. As to the issues, an open-circuited fault detection method is proposed on the basis of parameter estimation for the switch of rotor side convertor in double-fed wind power generator set. A whole model is built combining the induction motor and the convertor according to the topology structure of double-fed wind power generator set; the least square method is used to estimate the model parameter online; the model parameter is compared with the threshold values to diagnose whether there exists a fault. The simulation results show that the method is feasible and valid.

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Section: Modeling Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Open-circuited fault detection on switch of convertor in double-fed wind power generator set based on parameter estimation

Peng

Mao

Han

et al. 2015

2015 Chinese Automation Congress (CAC)

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show abstract

“…With the acceleration of the industrialization process, the pollution problems caused by the use of fossil fuels and problems of the energy shortage have attracted people's attention, which also promotes the development of renewable energy technologies, such as photovoltaic power generation technology [1][2], wind power generation technology [3][4]and tidal power generation technology [5][6]. In order to meet the demands of users, the power generated by these renewable energy power generation devices needs to be connected into grid through inverters [7].…”

Section: ⅰ Introductionmentioning

confidence: 99%

A Grid Voltage Feed-forward Control Strategy Based on The Virtual Impedance

et al. 2017

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Abstract. This paper initially investigates the conventional LCL filter grid-connected inverts system, which introduces the control strategy with inverter-side current feedback, and analyzes the deficiencies within the strategy. The stability of the controller can be improved by adopting the active damping scheme.However, the output current of the inverter is severely influenced by the external grid voltage distortion and the grid low-order harmonic voltage. In order to reduce this impact and gain high-quality power, a novel control strategy is proposed in this paper, in which the virtual complex impedance is introduced to feed grid voltage forward. By using the proposed control strategy, the total harmonic distortion can be greatly decreased, allowing the grid current to synchronize the reference current well. In addition, the modulation of the virtual complex impedance by controller can also quantificationally regulate the equivalent output impedance, which brings great convenience for inverters system designers to calculating and devising. Simulation results are presented to prove the validity and improvements achieved by the proposed controller. Ⅰ IntroductionWith the acceleration of the industrialization process, the pollution problems caused by the use of fossil fuels and problems of the energy shortage have attracted people's attention, which also promotes the development of renewable energy technologies, such as photovoltaic power generation technology[1-2], wind power generation technology[3-4]and tidal power generation technology [5][6]. In order to meet the demands of users, the power generated by these renewable energy power generation devices needs to be connected into grid through inverters [7]. Hence, stable operation of the inverter can greatly improve the overall capacity and the stability of the grid.In the case of grid connection, the total harmonic distortion(THD) of the grid current and the power factor of the generation are two important technical indicators [8].Under the condition in which inverters are required to work both independently and corporately, the inverter normally adopts an LCL filter to inhibit harmonics and control the THD of the grid current in a reasonable range. The distortion of the inverter can also meet the distortion limits as recommend in IEEE Std [9]. However, the LCL filter increases the order of the grid-connected inverter, thereby reducing the system's stability. To address this problem, many kinds of strategies are presented, including double-closed loop control strategy with active damping [10][11][12][13],closed-loop control in inverter-side current [14],Split capacitance in closed-loop control [15][16]. In active damping control schemes, the closed-loop control in inverter-side current and the split capacitance in closed-loop control are the most widely used, and compared with other control strategies, the power factor of grid is lower. However, these two strategies have both a stable system and only single

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“…There're 2 trillion kW wind energy resources every year in the world, and only 1% of the ground wind can meet the energy demand for the whole world [1]. The main style of utilization of wind energy is wind power generation internationally [2].…”

Section: Introductionmentioning

confidence: 99%

Structure Topology Optimization Design of Brake Pad in Large Megawatt Wind Turbine Disc Brake

Sha¹,

Yin²,

Zhang³

et al. 2015

Proceedings of the First International Conference on Information Sciences, Machinery, Materials and Energy

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Abstract. The brake pad of disc brake, as an actuator while wind turbine braking, plays an important role in braking system. For seeking an optimum structure of brake pad, its mechanical model during braking process of large megawatt wind turbine in actual working circumstance is established in this paper. Accordingly, model of topology optimization is figured out. Based on the results of topological optimization, a new structure of brake pad is analyzed and a new design plan combined with actual working circumstance is suggested. Testing about new structure which has been done in this paper assures the accuracy.

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Current situation and development of wind power in China

Cited by 4 publications

References 24 publications

Open-circuited fault detection on switch of convertor in double-fed wind power generator set based on parameter estimation

Open-circuited fault detection on switch of convertor in double-fed wind power generator set based on parameter estimation

A Grid Voltage Feed-forward Control Strategy Based on The Virtual Impedance

Structure Topology Optimization Design of Brake Pad in Large Megawatt Wind Turbine Disc Brake

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