Steady state power system issues when planning large wind farms

Wiik, J.A.; Gjerde, J.O.; Gjengedal, T.; Gustafsson, Martin V.

doi:10.1109/pesw.2002.985021

Cited by 39 publications

(10 citation statements)

References 2 publications

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“…Then 0 h  is the total harmonic distortion rate of the compensated front-net current and 0 g  is the reactive coefficient of the current before the grid is compensated. The reactive power factor is defined as the ratio of reactive power to quarterly apparent power, that is, the ratio of reactive current to fundamental current I 1 : (6) Assuming that the THD and the reactive power of the grid current after compensation are…”

Section: Inverter Harmonic Analysis and Optimized Compensation Controlmentioning

confidence: 99%

Research on Harmonic Problem of Micro-grid with Distributed Grid Connected Inverter

Zhao¹,

Zhao²

2017

Proceedings of the 2nd International Conference on Computer Engineering, Information Science &Amp; Application Technology (ICCI

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With the grid connected inverter is widely used in the new energy power generation, which is represented by wind energy and photovoltaic power generation, the resonance problem caused by the grid connected inverter becomes more and more a threat to the safe and stable operation of power system. This paper firstly introduces the basic structure of the new energy grid connected system, which is represented by wind power and photovoltaic system. Secondly, the harmonic resonance of the new energy grid connected system is analyzed. Finally, this paper introduces the optimization operation control process of the multi-function grid connected inverter, and proposes a power quality and reliability management strategy based on summarizing the advantages and disadvantages of various methods. 2. Grid-Connected Mechanism of Distributed Inverter System Grid-connected inverter is the core component of the grid-connected system. According to the type of DC-side power supply, can be divided into voltage source and current source inverter. In the distributed power generation system, the working mode of the grid-connected inverter can be divided into grid-connected mode and island mode [6]. Inverter output filter is the role of power electronic switching devices to produce high-order harmonic filter, in addition to isolation and energy storage auxiliary function. At present, the grid-type inverter filter types are L-type, LC type, LCL type, LLCL type [7].

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Section: Inverter Harmonic Analysis and Optimized Compensation Controlmentioning

confidence: 99%

Research on Harmonic Problem of Micro-grid with Distributed Grid Connected Inverter

Zhao¹,

Zhao²

2017

Proceedings of the 2nd International Conference on Computer Engineering, Information Science &Amp; Application Technology (ICCI

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“…In many wind farms, the wind measure tower has not been installed, and many real-time data have no access to the EMS system, including wind speed, active power, reactive power, unit operations and power projections. As mentioned in papers by Dresden J and Belmans R (2006), Niknam T et al (2008), Wiik J et al (2002), and Chun-Lung Chen (2008), due to lack of effective technical means to support, some control methods such as peak shaving, frequency and voltage regulation, and real-time planning can not keep up with the development of wind power. Furthermore, wind power output is not included in AGC and AVC closed-loop system.…”

Section: Inadequate Technical Support Of Wind Power Dispatching Technmentioning

confidence: 99%

Effects of Large-Scale Wind Integration on China Northwest Regional Power System and Future Solutions

Bai¹,

Wang

Xiao-zhong³

et al. 2011

IFAC Proceedings Volumes

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Abstract:The paper introduces the current planning integration situation of the wind power in Northwest Grid of China. The large-scale wind power integration, characterized by concentrated and high voltage level interconnection, makes appreciable effects on power system in stability control, frequency control, load tracking and voltage control. In this situation, the paper studies new requirements of power generation scheduling, dispatch, operation management, power market modelling, grid-connecting operation management, ancillary service management and so on. Finally, the paper introduces the solutions and strategies such as to strengthen the 750 kV grid construction, increase power export of the region, develop a Wind EMS, improve wind power forecasting, explore combined dispatching of wind power and other power plants, and introduce new power market mechanisms.

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“…Such kind of use case, where from technical perspective the WP PCC is the best location for providing a system service, is here referred to as ‘privileged’. Another privileged use case, closely linked to managing PCC voltage, is the aim of increasing VR hosting capacity …”

Section: Introductionmentioning

confidence: 99%

Models of reactive power‐related wind park losses for application in power system load flow studies

Kaempf

Braun

2017

Wind Energy

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In power system load flow studies, it is common to ignore wind park (WP) losses completely, since WPs are obliged to provide reactive power as a free-of-charge ancillary service. Strongly simplified WP loss estimations are also widespread. Prevailing loss modelling approaches may result in substantial and so far usually ignored reactive power allocation inefficiencies. The innovation of this paper lies in demonstrating this and in presenting an alternative modelling approach that combines speed, ease-of-use and accuracy. Calculations are based on a generic WP connected to 110 kV. It is simulated once using gearless permanent magnet synchronous generators and once using doubly fed induction generators. In this way, for the first time, the consequences of neglecting differences between wind generator types when calculating reactive power-related losses are systematically quantified. Loss-minimal dispatch is assessed using heuristic optimal power flow. Relevance of findings is demonstrated for the application of reducing system losses based on reactive power control of WPs in closed-loop optimal power flow schemes. It is shown that non-consideration of WP losses may lead to dispatch decisions where the increase in WP losses outweighs the achieved loss reduction in the 110 kV system by 400%. The study facilitates comparing reactive power ancillary services from WPs to that of other technologies from an economic perspective. It concludes by a benchmarking overview of pros and cons of modelling alternatives

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Steady state power system issues when planning large wind farms

Cited by 39 publications

References 2 publications

Research on Harmonic Problem of Micro-grid with Distributed Grid Connected Inverter

Research on Harmonic Problem of Micro-grid with Distributed Grid Connected Inverter

Effects of Large-Scale Wind Integration on China Northwest Regional Power System and Future Solutions

Models of reactive power‐related wind park losses for application in power system load flow studies

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