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Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement

A low-voltage ride-through and voltage protection technology, which is applied in the direction of emergency protection circuit devices, electrical components, single-network parallel feeding arrangements, etc., can solve problems such as protection is difficult to achieve, and achieve the effect of simple implementation, low cost, and safe operation of protection

Active Publication Date: 2012-06-20
TSINGHUA UNIV
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Problems solved by technology

[0007] Compatible with the low voltage index from the busbar measurement and the overcurrent index for each interval, the conventional protection configured according to the interval is difficult to realize; but the current rapid development can realize a s...

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  • Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement
  • Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement
  • Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement

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Embodiment Construction

[0022] An integrated protection method for reducing the demand for low-voltage ride-through capacity of wind farms proposed by the present invention includes two parts: a voltage protection criterion and a current protection criterion; the specific steps are as follows:

[0023] 1) Measure the bus phase voltage U of the grid-connected substation of the wind farm Φ , used for the voltage protection criterion, where the subscript Φ represents any phase of A, B, and C phases; measure the three-phase current I of the collector line in each interval of the substation iΦ , used for the current protection criterion, where the subscript i represents the i-th interval, and the current protection configuration adopts the traditional two-stage current protection, including the I-stage current quick-break protection and the II-stage overcurrent protection;

[0024] 2) Use the current protection criterion to realize the identification of the faulty line. When it is judged that the fault oc...

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Abstract

The invention belongs to the technical field of the electric power system and the wind power field grid-connection, in particular to an integration protection method capable of reducing the wind power field low-voltage crossing capacity, comprising the following steps: using a current protection criterion to realize the identification of a fault line, measuring a phase voltage U Phi of a bus lineof a wind power field grid-connection transformer station for a voltage protection criterion, calculating the voltage sag amplitude value percent value V lower than low-voltage crossing stable value(90% rated voltage value); if the V value is larger than or equal to 70, the II section current protection delay is canceled by the voltage protection criterion; if the V value is smaller than 70, the current protection delay on the fault line is adjusted at the real time by the voltage protection criterion, thus the relationship between the failure cut time formed by the current protection delay time and the line breaker action intrinsic time and the V value is as follow: (V2+1707)*t=5081, wherein 0.6<=t<=4. The wind power field low-voltage crossing capacity is increased on the system level, the implementation is simple and the cost is low; simultaneously the safety operation of the wind electric machine set and the electric power system is protected.

Description

technical field [0001] The invention belongs to the field of power system and wind farm grid connection, and in particular relates to an integrated protection method for reducing the demand for low-voltage ride-through capacity of wind farms. Background technique [0002] According to the requirements of the power system industry standards, large-capacity wind farms connected to the grid must have a certain low-voltage ride-through capability, and provide certain voltage and reactive power support in emergency situations such as grid-connected system failures. The low-voltage ride-through capability is mainly reflected in two key indicators: voltage drop amplitude and duration. The causes of serious voltage dips in power systems are basically caused by power system faults; relay protection is a technology for power system to detect and remove faults; therefore, the action characteristics of relay protection will directly determine the duration of voltage dips ; thus affecti...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02H7/26
Inventor 王宾董新洲
Owner TSINGHUA UNIV
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