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2020 19th International Conference on Harmonics and Quality of Power (ICHQP)最新文献

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High gain DC-DC converter for DC power transmission for offshore wind farms 用于海上风电场直流输电的高增益DC-DC变换器
Pub Date : 2020-07-01 DOI: 10.1109/ichqp46026.2020.9177909
T. Adefarati, M.S.L. Nozakuzaku, R. Naidoo, R. Bansal
The public concerns for a potential alternative power generation has been attributed to global warming, depletion of fossil fuels, greenhouse gas emissions that associated with the operation of conventional power plants, health hazards, soil degradation, ozone layer depletion and high cost of fossil fuels. The life span of reserved fossil fuel based on the global record is short and this has prompted many government agencies to put different strategic structures or platforms in place and adopt green technologies as the prospective means of satisfying the load demand. With renewable energy, electricity production can be distributed to various customers by using microgrid system to shorten transmission and distribution distances and losses as well as to save costs. This research work proposes the use of DC transmission on offshore wind farms to solve electricity shortage problems based on some technical and economic benefits. The power generated from the offshore wind farms is three times higher than power generated from onshore wind farms since offshore winds are stronger than onshore winds. Hence, offshore wind should be harnessed by the independent power providers for electrical power production. The simulation was carried out by using PSIM and the results were analyzed to show the impacts of offshore winds on the optimal operation of the power system.
公众对潜在的替代发电的关注是由于全球变暖、化石燃料的消耗、与常规发电厂运行有关的温室气体排放、健康危害、土壤退化、臭氧层消耗和化石燃料的高成本。基于全球记录的化石燃料储备的寿命很短,这促使许多政府机构采取不同的战略结构或平台,并采用绿色技术作为满足负荷需求的潜在手段。利用可再生能源,可以利用微电网系统将生产的电力分配给不同的客户,缩短输配电距离和损耗,节约成本。本研究工作在一定的技术经济效益的基础上,提出在海上风电场采用直流输电解决电力短缺问题。海上风力发电场的发电量是陆上风力发电场的3倍,因为海上风力比陆上风力强。因此,海上风能应该由独立的电力供应商利用来发电。利用PSIM软件进行了仿真,并对仿真结果进行了分析,揭示了海上风对电力系统优化运行的影响。
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引用次数: 1
Modeling of LVDC Distribution System: An Assessment of Control, Power Quality, and DC Faults LVDC配电系统建模:控制、电能质量和直流故障的评估
Pub Date : 2020-07-01 DOI: 10.1109/ICHQP46026.2020.9177920
Brenna Morris, Ghazanfar Faheem, Ragaini Enrico, Zaninelli Dario
The main goal of this paper is to design, control, and perform power quality analysis in the LVDC domain by using a three-level neutral point clamped converter. A ± 500 Vdc two-terminal VSC-LVDC distribution system uses, and time-domain simulation model is implemented in the Simulink environment. The stability of network controllers VSC (voltage & power) has analyzed during voltage and power perturbations. Furthermore, the power quality and faults in the DC network are studied. The inclusive simulations show the transients in DC bus voltage, while the proposed filter design can limit adequate harmonics content in the customer-end network. Finally, the LVDC faults analysis propose an advanced control strategy that can offer robust performance during steady-state and transient conditions, while improved DC voltage handling capabilities.
本文的主要目标是通过使用三电平中性点箝位转换器来设计,控制和执行LVDC域中的电能质量分析。采用±500vdc双端VSC-LVDC配电系统,并在Simulink环境下实现时域仿真模型。分析了网络控制器在电压和功率扰动下的稳定性。在此基础上,对直流电网的电能质量和故障进行了研究。仿真结果显示了直流母线电压的瞬态,而所提出的滤波器设计可以限制客户端网络中足够的谐波含量。最后,LVDC故障分析提出了一种先进的控制策略,可以在稳态和暂态条件下提供鲁棒性能,同时提高直流电压处理能力。
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引用次数: 1
The impact of aggregation interval on current harmonic simulation of aggregated electric vehicle loads 聚集间隔对聚集电动汽车负荷电流谐波模拟的影响
Pub Date : 2020-07-01 DOI: 10.1109/ICHQP46026.2020.9177899
G. Foskolos, K. Lundengård
Electric vehicles (EVs) poses new challenges for the Distribution System Operator (DSO). For example, EVs uses power electronic-based rectifiers for charging their batteries, an operation that could significantly impact Power Quality (PQ) in terms of harmonic distortion. The DSO responsibilities include ensuring grid code compliance confirmed by PQ metering. In general, 10 min rms values are sufficient. However, the large scale integration of non-linear loads, like EVs, could lead to new dynamic phenomena, possibly lost in the process of time aggregation.This paper presents an analysis of the impact on time aggregation (3 s-, 1min-and 10 min rms), when modelling current harmonics of aggregated EV loads, using power exponential functions. The results indicate that, while3 s rms and 1 min rms marginally affect the outcome, 10 min rms aggregation will lead to a significant deviation (>30%) in terms of maximum current harmonic magnitude.
电动汽车的发展对配电系统运营商提出了新的挑战。例如,电动汽车使用基于电力电子的整流器为电池充电,这一操作可能会严重影响谐波失真方面的电能质量(PQ)。DSO的职责包括确保电网代码符合PQ计量确认。一般来说,10个最小有效值就足够了。然而,像电动汽车这样的非线性负荷的大规模集成可能会导致新的动态现象,并可能在时间聚合过程中丢失。本文利用功率指数函数对聚合电动汽车负载的电流谐波建模,分析了对时间聚合(3秒、1分钟和10分钟均方根)的影响。结果表明,虽然3 s rms和1 min rms对结果影响不大,但10 min rms聚集会导致最大电流谐波幅值的显著偏差(>30%)。
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引用次数: 2
Level-Crossing Sampling for Li-Ion Batteries Effective State of Health Estimation 锂离子电池有效健康状态估计的交叉采样方法
Pub Date : 2020-07-01 DOI: 10.1109/ICHQP46026.2020.9177915
S. Qaisar, Maram AlQathami
Use of Li-Ion batteries is increasing exponentially. The Battery Management Systems (BMSs) are used to achieve a longer battery life and to maximize its usefulness. Contemporary BMSs are complex, creating a greater overhead consumption on the battery. The purpose of this work is to improve the power efficiency of the modern BMSs. To this end the processes of level-crossing sensing and processing are used. The emphasis is on developing a reliable, efficient, and real-time technique for estimating battery cells’ state of health (SoH). Using an original event-driven approach, the SoH is approximated. Comparison of the designed system is performed with traditional equivalents. Results show an outperformance of 4.7-fold in terms of compression gain and computational efficiency while maintaining sufficient precision of the SoH estimation.
锂离子电池的使用呈指数增长。电池管理系统(bms)用于实现更长的电池寿命,并最大限度地发挥其效用。当代的bms很复杂,对电池造成了更大的开销消耗。这项工作的目的是提高现代bms的功率效率。为此,采用了平交传感和处理过程。重点是开发一种可靠、高效、实时的电池健康状态(SoH)评估技术。使用原始的事件驱动的方法,SoH是近似的。将设计的系统与传统等效系统进行了比较。结果表明,在保持足够的SoH估计精度的同时,在压缩增益和计算效率方面的性能优于4.7倍。
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引用次数: 2
Analysis of Harmonic Levels from PWM Rectifiers due to Background Voltage Distortion 背景电压畸变引起的PWM整流器谐波电平分析
Pub Date : 2020-07-01 DOI: 10.1109/ICHQP46026.2020.9177882
R. O. Abdelqader, D. Robinson, P. Ciufo
PWM rectifiers receive significant attention due to their flexible control and perceived low harmonic currents, and as a consequence are replacing controlled and uncontrolled rectifiers as the preferred technology in industrial applications. However, low harmonic currents from PWM rectifiers are generally limited to applications where supply voltages have very low background distortion. An investigation using derived mathematical equations, simulation and laboratory measurement is presented to assess the influence of higher levels of background voltage distortion on the harmonic current distortion of PWM rectifiers. The mathematical expression for the harmonic current is derived using the Double Fourier Integral method. A simulation model is developed to quantity the effect of increased supply voltage distortion on harmonic currents from PWM rectifiers. Simulation results and laboratory measurements are presented for the simple case of a PWM rectifier to validate the methodology, which will ultimately be used for future work to quantity the influence of supply voltage distortion. As expected the increase in harmonic current of a PWM rectifier is heavily impacted by the severity of the voltage distortion appearing at the PWM rectifier terminals.
PWM整流器由于其灵活的控制和感知低谐波电流而受到极大的关注,因此正在取代受控和非受控整流器作为工业应用中的首选技术。然而,来自PWM整流器的低谐波电流通常仅限于电源电压具有非常低的背景失真的应用。通过推导数学方程、仿真和实验室测量,研究了高水平的背景电压畸变对PWM整流器谐波电流畸变的影响。用二重傅立叶积分法推导了谐波电流的数学表达式。建立了仿真模型,定量分析了电源电压畸变增大对PWM整流器谐波电流的影响。仿真结果和实验室测量给出了一个PWM整流器的简单案例来验证该方法,最终将用于未来的工作,以量化电源电压畸变的影响。正如预期的那样,PWM整流器谐波电流的增加受到PWM整流器端电压畸变严重程度的严重影响。
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引用次数: 0
Harmonic Resonance Assessment Based on Field Measurements Data in an Industrial Plant 基于现场测量数据的工业厂房谐波共振评估
Pub Date : 2020-07-01 DOI: 10.1109/ICHQP46026.2020.9177930
Amin Nafisi, M. Rezvani, R. Arababadi, Saeed Esmaeili
Harmonic resonance is a major concern in harmonic analysis of industrial power systems. This event can jeopardize system reliability and lead to significant issues in industrial plants. Consequently, assessment of electrical industrial networks from harmonic study point of view is essential. Field measurements can determine conditions and causes of a resonance phenomenon. In this study, the electrical network of Golgohar (GEG) Mining and Industrial Company is investigated using a power quality monitoring device. Measurements show a harmonic resonance at the frequency of 350 Hz. Moreover, this resonance is caused by the interaction of 6.3 kV shunt capacitors and the grid. In order to mitigate the resonance phenomenon, the whole electrical grid of the GEG Company is simulated in DIgSILENT PowerFactory software in details. A practical solution to eliminate the harmonic resonance is proposed. Results show the effectiveness of using single-tuned filters for harmonic resonance mitigation.
谐波共振是工业电力系统谐波分析中的一个重要问题。该事件可能危及系统可靠性并导致工业工厂的重大问题。因此,从谐波研究的角度对电网进行评估是必要的。现场测量可以确定谐振现象的条件和原因。本研究采用电能质量监测装置对Golgohar (GEG)矿业公司的电网进行了研究。测量结果显示频率为350赫兹的谐振。此外,这种谐振是由6.3 kV并联电容器与电网的相互作用引起的。为了减轻谐振现象,在DIgSILENT PowerFactory软件中对GEG公司整个电网进行了详细的仿真。提出了一种消除谐波共振的实用方法。结果表明,使用单调谐滤波器对谐波共振进行抑制是有效的。
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引用次数: 1
Market Structure for Enabling Volt/Var Control in Australian Distribution Networks: A Practical Perspective 在澳大利亚配电网启用伏特/无功控制的市场结构:一个实用的观点
Pub Date : 2020-07-01 DOI: 10.1109/ICHQP46026.2020.9177936
Izzah Afandi, A. Agalgaonkar, S. Perera
The proliferation of distributed generation (DG) poses new challenges in management of voltages in distribution networks. Excess generation by DG systems can cause voltage rise and reverse power flows, changing the paradigm of unidirectional power flow in distribution networks. Among many mitigation strategies, volt/var control methods that utilise inverter-interfaced DG systems to rectify voltage issues would be beneficial not only because DG system are typically located closer to customers, but the inverters can also provide fast response in contrast to mechanically operating volt/var control devices. As yet, DG owners only generate revenues from the production of active power while no incentives are provided for reactive power import/export, signifying the need for an update in the market structure to follow the growth of inverter-interfaced DG systems in distribution networks. This paper aims to propose an economic incentive scheme for utilising the full capacity of photovoltaic (PV) systems in Australian distribution networks. A ‘lost opportunity’ market structure that considers non-unity power factor operation of PV inverters in volt/var control strategies is proposed. The results show that the proposed market structure can encourage participation of domestic PV systems in volt/var control by providing a win-win solution for all stakeholders in a distribution network.
分布式发电的发展对配电网的电压管理提出了新的挑战。分布式发电系统的过量发电会引起电压上升和反向潮流,改变配电网单向潮流的模式。在许多缓解策略中,利用逆变器接口的DG系统来纠正电压问题的电压/无功控制方法将是有益的,不仅因为DG系统通常位于离客户更近的地方,而且与机械操作的电压/无功控制设备相比,逆变器还可以提供快速响应。到目前为止,DG所有者仅从生产有功电力中获得收入,而没有为无功电力进出口提供激励措施,这表明需要更新市场结构,以跟上配电网络中逆变器接口DG系统的增长。本文旨在提出一种经济激励方案,以利用澳大利亚配电网络中光伏(PV)系统的全部容量。提出了一种考虑光伏逆变器电压/无功控制策略中非单位功率因数运行的“失去机会”市场结构。结果表明,所提出的市场结构可以通过为配电网中的所有利益相关者提供双赢的解决方案,鼓励国内光伏系统参与伏特/无功控制。
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引用次数: 1
Measurements of Harmonic Voltages at Multiple Locations in LV and MV Networks 低压和中压网络中多个位置谐波电压的测量
Pub Date : 2020-07-01 DOI: 10.1109/ICHQP46026.2020.9177926
N. Nakhodchi, T. Busatto, M. Bollen
This paper presents harmonic voltage measurements for a part of a distribution network including low-voltage (400 V) and medium-voltage (10 kV). Measurements were performed during 2017 and 2018 in the north of Sweden. This paper shows correlations between different harmonic orders in low voltage and the correlation between low and medium-voltage harmonics. This information can be used for harmonic propagation studies in distribution networks. The results showed significant correlation between the 5th and 7th harmonics for low-voltage side and very high correlation between 5th harmonic order in low-voltage and medium-voltage. It is also observed that 5th harmonic has almost the same values for all transformers connected to the same 40 kV network.
本文介绍了配电网中低压(400v)和中压(10kv)部分谐波电压的测量方法。测量于2017年和2018年在瑞典北部进行。本文给出了低电压下不同次谐波之间的相关关系以及中、低压谐波之间的相关关系。这些信息可用于配电网中谐波传播的研究。结果表明,低压侧的5次谐波和7次谐波显著相关,低压和中压侧的5次谐波阶相关性非常高。还观察到,连接到同一40kv网络的所有变压器的5次谐波值几乎相同。
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引用次数: 8
Probabilistic Component-Based Models for Harmonic Analysis of Generic Aggregate LED Lamp Loads 基于概率分量的综合LED灯负载谐波分析模型
Pub Date : 2020-07-01 DOI: 10.1109/ICHQP46026.2020.9177934
Z. Guo, S. Djokic, X. Xu, A. Collin, R. Langella, A. Testa
This paper proposes a methodology for improving the representation of component-based models intended for harmonic analysis of generic aggregate LED lamp loads by deriving pdfs of the parameter values. The methodology is illustrated using time-domain current waveform measurements of LED lamps with switch-mode driver circuits (without power factor correction). Following the model derivation, Monte Carlo simulations are used to synthesize generic aggregate LED lamp loads, which are compared against random aggregations of 51 measured lamps. It is demonstrated that a single model with mean values of the parameters, scaled by the total power demand, can be used to simplify the representation of generic aggregate LED lamp loads in large-scale emission assessment studies. Correction factors, which reduce the effect of this simplification in frequency domain applications, are also derived and discussed.
本文提出了一种方法,通过导出参数值的pdf来改进用于通用聚合LED灯负载谐波分析的基于组件的模型的表示。该方法是用带开关模式驱动电路的LED灯的时域电流波形测量来说明的(没有功率因数校正)。在模型推导之后,采用蒙特卡罗模拟方法合成了通用聚合LED灯负载,并将其与51个测量灯的随机聚合进行了比较。结果表明,在大规模排放评估研究中,采用单个模型,将参数的平均值按总功率需求进行缩放,可以简化一般LED灯负载的表示。文中还推导并讨论了在频域应用中减小这种简化影响的校正因子。
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引用次数: 0
Improving dynamic microgrid modelling through the use of synchronised field data 通过使用同步现场数据改进动态微电网建模
Pub Date : 2020-07-01 DOI: 10.1109/ICHQP46026.2020.9177929
RJ Erasmus, A. Rens, G. V. Schoor, K. Uren
Simulation during the design and operation of microgrids should include dynamic phenomena that would be a result of the unpredictable variation in renewable generation and loading. Detailed modelling of different components is constrained when using simplified models from suppliers. Accurate prediction of system response is needed to maintain voltage stability within a microgrid during islanded conditions and when grid-connected, between interconnected microgrids. Distributed energy resources in a microgrid are constituted by local generation (mostly renewable and standby diesel), a grid connection and increasingly, local storage (most commonly batteries). Synchronised field data is used to validate, and improve, the results obtained from a microgrid simulation model during both steady-state and transient conditions. This microgrid simulation approach makes use of MATLAB™ and DIgSILENT™, and is shown to be useful in designing for predictable performance. With field representative results, the model developed in DIgSILENT™ can be used as a development tool allowing various control strategies and component configurations to be tested.
微电网设计和运行过程中的模拟应包括可再生能源发电和负荷不可预测变化的动态现象。当使用来自供应商的简化模型时,不同组件的详细建模受到约束。在孤岛状态下、并网时、互联微电网之间,需要对系统响应进行准确的预测,以保持微电网内的电压稳定性。微电网中的分布式能源由本地发电(主要是可再生能源和备用柴油)、电网连接以及越来越多的本地存储(最常见的是电池)组成。同步现场数据用于验证和改进稳态和瞬态条件下微电网仿真模型得到的结果。这种微电网仿真方法利用了MATLAB™和DIgSILENT™,并被证明在设计可预测的性能方面是有用的。有了具有现场代表性的结果,在DIgSILENT™中开发的模型可以用作开发工具,允许测试各种控制策略和组件配置。
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引用次数: 0
期刊
2020 19th International Conference on Harmonics and Quality of Power (ICHQP)
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