Low voltage ride through control system and control method based on variable pitch
A low-voltage ride-through and control system technology, applied in the control of wind turbines, wind power generation, wind turbines, etc., can solve problems such as the inability to control energy in real time, achieve flexible low-voltage ride-through control, ensure rapidity and reliability, avoid Effects of residual energy treatment
Inactive Publication Date: 2015-09-09
YANSHAN UNIV
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Problems solved by technology
[0010] To sum up, most of the existing low-voltage ride-through control methods for hydraulic wind turbines cannot control the energy in real time from the source during the control process.
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[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings: a low-voltage ride-through control system based on variable pitch, its hydraulic principle and hardware configuration system diagram and control system principle are as follows figure 1 , figure 2 As shown, the system is mainly composed of three parts: the wind turbine part, the hydraulic transmission part and the power generation part. The wind turbine part is coaxially rigidly connected with the hydraulic transmission part, and the hydraulic transmission part is coaxially rigidly connected with the power generation part;
[0031] The wind turbine part mainly includes a wind speed sensor 1, a wind wheel 2 and a pitch control system;
[0032] Described variable pitch system, its structural schematic diagram is as follows image 3 As shown, it includes an angular displacement sensor 22, an inner ring gear 23, a pinion 24, a hydraulic motor 25, a proportional d...
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The invention discloses a low voltage ride through control system and control method based on a variable pitch. According to the system, a wind turbine part comprises an air velocity transducer, a wind wheel and a variable pitch system; a generator part comprises a generator, a multifunctional instrument and a power grid; and a hydraulic transmission part comprises a first rotating speed and torque transducer, a quantifying pump, a high pressure pipeline, a first one-way valve, a second one-way valve, a second overflow valve, an oil supplementing pump, an oil supplementing tank, a safety valve, a flow transducer, a rotating speed controller, a variable motor, a power controller, a second rotating speed and torque transducer and a low pressure pipeline. According to the control method, when the voltage of the power grid drops due to a fault of the power grid, the input of system energy is reduced from an energy source; and the principle of coordinating energy lies in that the swing angle control of the variable motor is preferential, remaining energy in the system is stored in the wind wheel, meanwhile, the opening degree of a proportional directional valve of the variable pitch system is controlled, the swing angle of the hydraulic motor is changed, then the pitch angle of blades is changed, and the input of system energy is changed.
Description
technical field [0001] The invention belongs to the technical field of wind power generation, and relates to the main transmission system and the variable pitch system of the hydraulic wind power generating set. The traditional transmission system is replaced by the hydraulic transmission equipment and the hydraulic control system, and particularly relates to a low-voltage ride-through based on the variable pitch. Control system and its control method. Background technique [0002] With the increasing environmental and energy problems, wind power generation has attracted more and more attention at home and abroad, and the wind power industry has also developed rapidly. [0003] As a new type of wind power generation device, the hydraulic wind turbine adopts a fixed-quantity pump-variable motor closed-type hydraulic transmission system to effectively cooperate with the excitation synchronous generator. Compared with the gearbox-type and direct-drive wind turbines, this unit ...
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Login to View More IPC IPC(8): H02J3/38F03D7/00
CPCY02E10/72Y02E10/76
Inventor 艾超陈立娟孔祥东闫桂山刘少荣
Owner YANSHAN UNIV