42results about "Engine output effect" patented technology

A method of controlling a wind turbine farm includes programming at least one algorithm within at least one processor. The wind turbine farm has at least one wind turbine that includes a generator. The at least one algorithm is representative of a relationship between at least one electric power grid tolerance range and an electric power generation rating. The method also includes determining the electric power grid tolerance range. The method further includes generating at least one wind turbine farm tolerance adjustment signal representative of a wind turbine farm tolerance range. The method also includes changing the wind turbine farm tolerance range.

The present invention discloses an extremum seeking-based control method for maximum output tracking of a wind turbine generator, mainly comprising three steps of first closed-loop feedback, second closed-loop feedback, and third closed-loop feedback. The method for resisting mechanical fatigue of a double-fed variable speed constant frequency wind turbine generator by controlling mechanical torque while capturing maximum wind energy provided in the present invention is applied to a double-fed variable speed constant frequency wind turbine system by improving the control based on sliding mode extremum seeking with the following effects that, with regard to the maximum wind energy tracking effect, the rotating speed can be quickly adjusted to keep the tip speed ratio λ as its optimum value after the wind speed changes, so that the wind energy utilization coefficient is restored to the maximum value.

It is described an arrangement for determining a target value of an operational variable of a wind turbine, the arrangement comprising: at least one input terminal for receiving at least one operational parameter of the wind turbine; a determining unit adapted to determine a target value of an operational variable of the wind turbine based on the operational parameter. Further, a corresponding method and a wind turbine are described.

An assembly for retrofitting fixed speed, doubly fed and fully converted wind turbines. A differential having an output shaft coupled to the main generator and a control shaft to change a ratio between differential input and output and coupled to the auxiliary generator. The main generator operates at constant frequency and is coupled to an electric power grid without a power converter. A variable speed auxiliary generator may be coupled to the electric grid through auxiliary power electronics. A controller may during low loads assign a full load to the auxiliary generator, during typical loads assign a variable shared load between the auxiliary and main generators based on an optimization algorithm and during high loads assign a fixed shared load between the auxiliary and main generators based on the internal gear ratio of the differential. For step-down differentials, at high loads the full load may go to the main generator.

A method of operating a wind turbine above a predefined wind velocity comprising the step of operating a control parameter of the wind turbine within a tolerance band from a reference set-point curve of that control parameter. A wind turbine and a cluster of wind turbines is also contemplated.

An apparatus and method is disclosed for over-rating a wind turbine using turbulence prediction. Weather forecast information is used to determine whether there is a risk of turbulent conditions occurring at the site of the wind turbine. The wind turbine is over-rated if turbulent conditions are not predicted, and conversely over-rating is cancelled or reduced if turbulent conditions are expected. This allows an increase in the annual energy production of the wind turbine to be realised. The weather forecast information may be combined with real time measurements of operating conditions to supplement the predictions.

Disclosed is a helical turbine power generation system for generating electricity by using a helical turbine and an overload prevention generator, the system including: a helical turbine rotatably provided in a frame so as to continuously generate rotation force under unidirectional or multidirectional fluid flow; a step-up gear for increasing a rotational velocity of the helical turbine up to a level required for generating electricity; and an overload prevention generator for generating electricity by using the rotational velocity transferred from the step-up gear, and for preventing overload caused by a sudden increase in a rotational velocity. Therefore, it is possible to reduce equipment costs and to prevent environmental pollution.

The present invention relates to a system and method for harvesting wind energy from air exhausted by other systems. Ventilation and heat exchange systems force air movement using fans. Exhaust airflow may also be the result of a combustion system. The exhaust air is generally wasted as it is diffused back to the atmosphere. Significant energy may be recovered from this exhaust air using relatively small turbines inserted into the airflow. Careful positioning of the turbine maximizes the recovery efficiency.

A wave energy converter (WEC) having an asymmetrically shaped float and a spar which move relative to each other in response to the waves. The asymmetrical float has one side longer than the other. A power take off device (PTO) is coupled between the asymmetric float and the spar for converting their relative motion into useful power. Apparatus is coupled to the WEC for: (a) orienting and rotating the longer side of the float to face and receive oncoming waves to increase energy capture when the waves have an amplitude below a predetermined value for improving the power generation of the WEC; and (b) rotating the float to orient the narrower side of the float to face and receive the incoming waves when the waves have an amplitude above a predetermined value, so as to reduce the forces to which the WEC is subjected.There is no known WEC system with an asymmetrical float which is raised and lowered by the waves.

Method of operation of a variable speed wind turbine (11) having control means for its regulation tracking a power vs. generator speed curve (31) comprising a nominal zone (39) where the power is kept constant at a nominal value, a first sub-nominal zone (33) where the generator speed is kept constant at its coupling value, a second sub-nominal zone (35) where both generator speed and power are allowed to increase / decrease in line with wind speed and a third sub-nominal zone (37) between the second sub-nominal zone (35) and the nominal zone (39) that comprises a first vertical segment (41) at a generator speed nr2 higher than the generator nominal speed nr1 and a second vertical segment (43) at the generator nominal speed nr1 connecting with the nominal zone (39), each of both segments (41, 43) to be followed in function of the wind speed changes for optimizing the energy production.

A gas turbine control system which can suppress an increase in rotating speed. of a gas turbine easily upon occurrence of abrupt drop in gas turbine load even if its power generation facility is employing low calorie gas as fuel. The gas turbine control system comprises a fuel flow rate control valve (9) arranged in a passage (3) for supplying fuel gas to the gas turbine (2) in order to regulate the flow rate of fuel gas, a heat reduction gas supply unit (5) for supplying heat reduction gas to the fuel gas supply passage (3), and a system controller (10). In order to decrease the quantity of heat input to the gas turbine (2) when an abrupt drop in load on the gas turbine (2) is detected, the system controller (10) controls heat reduction gas supply operation by the heat reduction gas supply unit (5) in addition to controlling the opening of the fuel flow rate control valve (9).

A wind turbine power plant comprises a plurality of wind turbines, each having a rated output and under the control of a power plant controller. The power plant also has a rated output which may be over-rated in response to one or more of electricity pricing data, power plant age and operator demand. The power plant controller can send over-rating demand signals to individual turbines. The controllers at the turbines include a fatigue life usage estimator which estimates a measure of the fatigue life consumed by key components of the turbine. If this measure exceeds a target value for any component, over-rating is prevented at that turbine.

The invention relates to a method for operating a wind energy system wherein when a first settable boundary value (G1) is reached by a first parameter (M1) a process is automatically started whose course is monitored by measuring a second parameter (M2). By comparing the measured values of the second parameter (M2) with a second settable boundary value (G2), the first settable boundary value is changed upon reaching the second boundary value (G2) by the second parameter (M2).

The invention relates to an intelligent through flow turbine with safety, reliability and excellent performances. The intelligent through flow turbine comprises a filter mechanism, a water guide pipe and a water inlet pipe; the filter mechanism includes a third driving motor, a driving wheel, a second pulley, a first lifting wire and a filter unit; the filter unit includes a pull rod, a filter screen and two connecting modules; a guide chamber is formed below the water guide pipe; and a guide mechanism is arranged in the guide chamber, and includes a second driving motor, a first connecting rod, a second connecting rod, a slide block and a support frame. The intelligent through flow turbine with safety, reliability and excellent performances uses the filter screen for effectively isolating impurities in water currents, uses the filter mechanism for driving the filter screen to ascend through monitoring flow data, is convenient for removing the impurities, guarantees normal operation of a power generation mechanism, and has improved safety and reliability; and in addition, a guide plate upwards rotates through the guide mechanism, so that the contact area between the water currents and blades is increased, the work of the water currents applied on the blades is improved, and the excellent power generation performance of the water turbine is guaranteed.

An assembly for retrofitting fixed speed, doubly fed and fully converted wind turbines. A differential having an output shaft coupled to the main generator and a control shaft to change a ratio between differential input and output and coupled to the auxiliary generator. The main generator operates at constant frequency and is coupled to an electric power grid without a power converter. A variable speed auxiliary generator may be coupled to the electric grid through auxiliary power electronics. A controller may during low loads assign a full load to the auxiliary generator, during typical loads assign a variable shared load between the auxiliary and main generators based on an optimization algorithm and during high loads assign a fixed shared load between the auxiliary and main generators based on the internal gear ratio of the differential. For step-down differentials, at high loads the full load may go to the main generator.

The invention relates to a method, system and computer readable code for diagnosis of pitch and / or load defects of e.g. wind turbines as well as wind turbines using said diagnosis method and / or comprising said diagnosis system.

The invention discloses an automatically stretching type vertical-axis wind driven generator comprising a generator, a spindle, a spoke, vanes, a support rib and a screw rod. The screw rod is mounted on the spindle which is connected with the generator, and the vanes are mounted on the spindle through the spoke and connected with the screw rod through the support rib. The automatically stretching type vertical-axis wind driven generator further comprises a support frame, a heavy ball, a gear, an inner sleeve, an outer sleeve, an inner brake and an outer brake, when the wind speed is too high, the heavy ball locks the outer sleeve, the gear drives the screw rod to move downwards, the vanes close up, and the outer brake limits the displacement of the screw rod; when the speed is too low, the heavy ball lock the inner sleeve, the gear drives the screw rod to move upwards, the vanes expand, and the inner brake limits the displacement of the screw rod. The automatically stretching type vertical-axis wind driven generator is driven without a motor, vanes' sweeping area is decreased automatically when wind speed is too high and increased automatically when wind speed is too low, the generating capacity of the vertical-axis wind driven generator is increased, safe and stable running of the vertical-axis wind driven generator is guaranteed.

A method of operating a wind turbine with pitch control, in which values of the generated power and the operating speed of the rotor are established at a discrete number of secure ranges for wind speeds above a critical wind velocity. A wind turbine and a cluster of wind turbines employing such a method are also contemplated.

The present invention relates to a system and method for harvesting wind energy from air exhausted by other systems. Ventilation and heat exchange systems force air movement using fans. Exhaust airflow may also be the result of a combustion system. The exhaust air is generally wasted as it is diffused back to the atmosphere. Significant energy may be recovered from this exhaust air using relatively small turbines inserted into the airflow. Careful positioning of the turbine maximizes the recovery efficiency.

The invention relates to a method, system and computer readable code for diagnosis of pitch and / or load defects of e.g. wind turbines as well as wind turbines using said diagnosis method and / or comprising said diagnosis system.

The invention discloses a pitch and torque instruction processing system of a main control system of a wind turbine. The pitch and torque instruction processing system comprises a controller input unit, a pitch control unit and a torque control unit; the controller input unit comprises a generator rotating speed module, a rotating speed setting module and a switching control module; the pitch control unit comprises a pitch controller and a pitch amplitude limiting module; the torque control unit comprises a torque controller and a torque amplitude limiting module; and the generator rotating speed module and the rotating speed setting module are used for obtaining rotating speed deviation, the switching control module is used for determining the rotating speed deviation to serve as input ofthe pitch controller or the torque controller, a pitch instruction or a torque instruction is obtained through input determination, and therefore pitch changing or flow changing is achieved. According to the pitch and torque instruction processing system, smooth switching of the wind turbine under various power generation working conditions can be achieved, and maximum power operation of the windturbine under various working conditions is achieved; meanwhile, the wind turbine can be prevented from frequently entering and exiting from a rated working point through the switching control module, the reliability of the wind turbine is improved, and the service life of the wind turbine is prolonged.

The invention relates to a power plant system (10), comprising a turbine branch (11) made of a gas turbine (12) and a generator (18), which is directly driven by the gas turbine (12) and generates analternating current have an operating frequency, wherein the output of the generator is connected to a grid (21) having a predefined mains frequency. Between the generator (18) and the grid (21), an electronic decoupling device, or a variable electronic gear mechanism (27) is provided, which decouples the operating frequency from the mains frequency. In such a system, flexible operation with highefficiency is achieved in that the gas turbine (12) is configured for power greater than 100 MW, and that the electronic device (27) is a frequency converter in the form of a matrix converter.