Feathering control system of electric variable pitch system
A pitch system and control system technology, applied in the control of wind turbines, engines, wind power generation, etc., can solve the problems of inability to emergency feathering, inability to complete pitching and even emergency feathering actions, and achieve the effect of ensuring safety
Active Publication Date: 2011-01-05
SANY ELECTRIC CO LTD
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Problems solved by technology
If only the drive is used for control, no matter if the control module of the drive or the drive module fails, it may not be possible to complete the pitch change or even the emergency feathering action
If a bypass circuit is simply added, the driver's control module cannot be feathered in an emergency
Method used
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[0035] The closed-loop control system is characterized in that the output of the controlled object (the controlled quantity) will be sent back to affect the output of the controller, forming one or more closed loops. The closed-loop control system has positive feedback and negative feedback. If the feedback signal is opposite to the system given value signal, it is called negative feedback (Negative Feedback). If the polarity is the same, it is called positive feedback. Generally, closed-loop control systems use negative feedback. , also known as negative feedback control system.
[0036] The open-loop control system (open-loop control system) means that the output of the controlled object (controlled quantity) has no influence on the output of the controller (controller). In an open loop control system, there is no reliance on feeding back the controlled quantity to form any closed loop.
[0037] The invention provides a feathering control system of an electric pitch control...
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The invention relates to a feathering control system of an electric variable pitch system, comprising a first time relay connected with the first control end of a driver. The main contact of a first contactor is connected to a ring-opening pitch-closing inlet wire of the electric variable pitch system in series; the coil of the first time relay is connected to a power supply loop in series, and the contact of the first time relay and the coil of the first contactor are connected to the power supply loop in series; a connecting wire between the contact of the first time relay and the coil of the first contactor is connected with the second control end of the driver; the triggering end of the first time relay is connected with the first control end of the driver and used for receiving a pulse signal transmitted by the first control end of the driver, wherein the fixed period of the pulse signal is Td; the first time relay is triggered at the rising edge of the pulse signal; the delay time of the first time relay is T1; and the fixed period Td is less than the delay time T1. The invention provides a feathering control system of an electric variable pitch system, which is used for realizing ring-opening control to ensure the safety of the electric variable pitch system.
Description
technical field [0001] The invention relates to the field of wind power generation control, in particular to a feathering control system of an electric pitch control system. Background technique [0002] see figure 1 , which is a schematic diagram of the control principle of the existing DC pitch motor. From figure 1 It can be seen that the motor in the existing DC electric pitch system is controlled by the driver when the drive is normal, and some AC electric pitch systems are directly connected to the motor by the bypass line, such as figure 1 As shown on the right, when the power module of the drive is damaged, the control module of the drive controls the bypass contactor to close to complete emergency feathering. [0003] figure 1 Both motor control schemes shown have significant deficiencies. If only the driver is used for control, no matter whether the control module of the driver or the driver module fails, it may not be possible to complete the pitch change or e...
Claims
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Login to View More IPC IPC(8): F03D7/00
CPCY02E10/723Y02E10/72
Inventor 王建波余铁辉董召然李营
Owner SANY ELECTRIC CO LTD