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Direct drive wind-driven power generation system control method

A wind power generation system and power control technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve problems such as aggravating faults, affecting the safe operation of the power grid, increasing the difficulty of system recovery, and achieving strong low voltage ride-through capability , the effect of power leveling

Inactive Publication Date: 2017-06-20
张凤军
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Problems solved by technology

On the other hand, as the proportion of wind power in the power grid continues to increase, if the wind turbine still adopts a passive protective disconnection method when the power grid fails, it will increase the difficulty of restoring the entire system, and may even aggravate the failure, seriously affecting the power grid safe operation of

Method used

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Embodiment Construction

[0017] specific implementation plan

[0018] figure 1 Among them, the motor side converter is composed of three-phase uncontrollable rectifier bridge, filter capacitor and Boost converter, which is used to control the active power output of the wind turbine; the grid side converter controls the d-axis and q-axis current of the grid side to control its The DC side voltage and the reactive power flowing to the grid realize the decoupling control of active and reactive power, and usually operate in the state of unity power factor. The DC side of the grid-side converter is integrated into the energy storage system, which is composed of a supercapacitor bank and a bidirectional DC-DC converter to control the active output of the wind power system. When the power grid is running normally, when the output power of the wind turbine is higher than the system output power reference value, the excess energy is stored in the energy storage device immediately; when the generator output po...

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Abstract

A direct drive wind-driven power generation system control method comprises four parts: a permanent-magnet direct drive wind-driven power generation system, motor-side converter control, grid-side converter control and energy storage system control. The invention provides a safe, stable and high-quality-operating direct drive wind-driven power generation system control strategy. The control strategy has a power stabilization effect when the grid is running normally. When a power grid fails, the method has good low-voltage crossing ability so that the normal operation of the system is not affected by power grid failure.

Description

[0001] Technical field [0002] The invention relates to a direct-drive wind power generation system, in particular to a power control method for the direct-drive wind power generation system. Background technique [0003] Compared with the doubly-fed wind power generation system, the direct-drive wind power generation system has gradually been widely used in wind farms in recent years due to its characteristics of small mechanical loss, high operational reliability, high power generation efficiency, large installed capacity, and easy maintenance. . [0004] As the grid penetration rate of wind power generation (that is, the proportion of wind power generation in the grid) continues to increase, the interaction between the wind power system and the grid is also becoming more and more important. Its main manifestations are as follows: On the one hand, due to changes in wind speed, wind direction and other natural conditions, the wind power system cannot continuously and stably...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28H02J3/24H02J3/12
CPCH02J3/12H02J3/24H02J3/28H02J3/386Y02E10/76
Inventor 张凤军
Owner 张凤军
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