Abstract

The accurate evaluation and fair comparison of wind farms power generation performance is of great significance to the technical transformation and operation and maintenance management of wind farms. However, problems exist in the evaluation indicator systems such as confusion, coupling and broadness, and the influence of wind energy resource differences not being able to be effectively eliminated, which makes it difficult to achieve the fair comparison of power generation performance among different wind farms. Thus, the evaluation indicator system and comprehensive evaluation method of wind farm power generation performance, including the influence of wind energy resource differences, are proposed in this paper to address the problems above, to which some new concepts such as resource conditions, ideal performance, reachable performance, actual performance, and performance loss are introduced in the proposed indicator system; the combination of statistical and comparative indicators are adopted to realize the quantitative evaluation, indicator decoupling, fair comparison, and loss attribution of wind farm power generation performance. The proposed comprehensive evaluation method is based on improved CRITIC (Criteria Importance though Intercrieria Correlation) weighting method, in which the uneven situation of different evaluation indicators and the comprehensive comparison of power generation performance among different wind farms shall be overcome and realized. Several sets of data from Chinese wind farms in service are used to validate the effectiveness and applicability of the proposed method by taking the comprehensive evaluation models based on CRITIC weighting method and entropy weighting method as the benchmarks. The results demonstrated that the proposed evaluation indicator system works in the quantitative evaluation and fair comparison of wind farm design, operation, and maintenance and traces the source of power generation performance loss. In addition, the results of the proposed comprehensive evaluation model are more in line with the actual power generation performance of wind farms and can be applied to the comprehensive evaluation and comparison of power generation performance of different wind farms.

Highlights

  • IntroductionEquivalent full load hours, real availability rate, mean time between failure, mean time to repair, mean routine maintenance time, comprehensive wind farm electric power consumption rate, transmission line loss rate

  • The existing evaluation indicator systems have problems such as confusion, coupling and broadness, and the influence of wind energy resource differences could not be effectively eliminated, which makes it difficult to achieve the fair comparison of power generation performance among different wind farms

  • (2) The proposed comparative indicators are based on the wind energy resource and design level of wind farms, which can eliminate the influence of wind energy resource and design-level differences and achieve the fair comparison of power generation performance among different wind farms

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Summary

Introduction

Equivalent full load hours, real availability rate, mean time between failure, mean time to repair, mean routine maintenance time, comprehensive wind farm electric power consumption rate, transmission line loss rate. The existing evaluation indicator systems have problems such as confusion, coupling and broadness, and the influence of wind energy resource differences could not be effectively eliminated, which makes it difficult to achieve the fair comparison of power generation performance among different wind farms. The existing evaluation indicator systems cannot trace the causes of wind farm power generation performance loss, which is difficult to effectively guide the technical transformation and operation and maintenance management of wind farms. To solve the aforementioned problems, the evaluation indicator system and comprehensive evaluation method of wind farm power generation performance, including the influence of wind energy resource differences, are proposed in this paper.

The Design Principle of Indicator System
The Structure Design of Indicator System
The Indicators of Resource Conditions
The Indicators of Ideal Performance
The Indicators of Reachable Performance
The Indicators of Actual Performance
The Indicators of Performance Loss
Comprehensive Evaluation Method of Wind Farm Power Generation Performance
Improved CRITIC Weighting Method
Modeling Process
Case Study
Wind Turbines Power Generation Performance Evaluation Results
Result
Wind Farms Power Generation Performance Evaluation Results
Findings
Conclusions

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