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Low voltage ride through control method for full-power high-speed permanent synchronous fan

A low-voltage ride-through, permanent magnet synchronous technology, applied in wind power generation, single-grid parallel feeding arrangement, greenhouse gas reduction, etc., can solve the problem of not considering the optimal control of the DC side crowbar, and achieve the effect of reducing the load of the unit

Inactive Publication Date: 2013-05-08
HARBIN ELECTRIC MACHINERY FACTORY (ZHENJIANG) CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the technical solutions proposed in the patent literature "A Control Method for Improving Asymmetrical Fault Ride-through Capability of Wind Power System" (Application No.: 2011 10181264.8), "Direct Drive Wind Power Converter DC Unloading Circuit" (Application No.: 201120439682.8), However, the above technical solution simply consumes the excess energy of the fan directly, without considering the influence of the unit load and the optimal control of the combination of the crowbar circuit on the DC side

Method used

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  • Low voltage ride through control method for full-power high-speed permanent synchronous fan
  • Low voltage ride through control method for full-power high-speed permanent synchronous fan
  • Low voltage ride through control method for full-power high-speed permanent synchronous fan

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Embodiment Construction

[0014] The low-voltage ride-through control method of the full-power high-speed permanent magnet synchronous fan involves two main parts: the first part is the direct torque control method of the inverter on the motor side (see figure 1 ), the second part is the crowbar circuit control method with energy storage link on the DC side (see image 3 ). in:

[0015] The first part is the direct torque control method of the inverter on the motor side.

[0016] The direct torque control is performed on a two-phase stationary coordinate system (αβ coordinate). The motor matrix equation in the αβ coordinate system is:

[0017]

[0018] In the formula,

[0019] u sa , u sβ , u ra , u rβ are the components of the stator / rotor voltage on the αβ coordinate system;

[0020] i sa i sβ i ra i rβ are the components of the stator / rotor current on the αβ coordinate system;

[0021] R s , R r , L s , L m , L r , p, ω are stator / rotor winding equivalent resistance, stator in...

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Abstract

The invention relates to the running control technique of wind power generation equipment, in particular to a low voltage ride through control method for a full-power high-speed permanent synchronous fan. The method is that mechanical load impact on a machine set when a power grid is in fault can be reduced by reducing machine side converter direct torque control reference preset orders Te* on the motor side of a wind power generation system, and simultaneously a crowbar circuit with an energy storage link is arranged on the direct current side to absorb and store redundant energy when the power grid is in fault to achieve low voltage ride through of the fan. The method can reduce load of a wind power generation set when the power grid is in fault, enables the machine set to run safely and stably and can absorb, store and utilize redundant energy when the power grid is in fault.

Description

technical field [0001] The invention relates to the operation control technology of wind power generating equipment, in particular to a low-voltage ride-through control method of a full-power high-speed permanent magnet synchronous fan. Background technique [0002] Wind energy, as a renewable energy, can effectively solve the problems of fossil energy depletion, so it has been more and more widely used recently. At present, the proportion of wind power in the power supply of the entire power system is increasing, and various countries have successively issued regulations requiring wind turbines to have a certain ride-through capability (low voltage ride-through) under grid faults. [0003] High-speed permanent magnet fans with full-power inverters are widely used in wind turbines due to their superior low-voltage ride-through performance. In the case of a power grid fault, when the motor side converter adopts the direct torque control strategy, it usually directly reduces ...

Claims

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Application Information

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IPC IPC(8): H02J3/28H02J3/38
CPCY02E10/763Y02E70/30Y02E10/766Y02E10/76
Inventor 陈毅东
Owner HARBIN ELECTRIC MACHINERY FACTORY (ZHENJIANG) CO LTD
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