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Modified dynamic programming based unit commitment technique 改进的基于动态规划的单元承诺技术
Pub Date : 2010-07-25 DOI: 10.1109/PES.2010.5588184
Joonhyung Park, Sun-kyo Kim, Geun-Pyo Park, Y. Yoon, Sang-Seung Lee
This paper represents a modified dynamic programming solution to the unit commitment (UC) problem. The UC is a complex decision-making process because of multiple constraints which may not be violated while finding the optimal or suboptimal commitment schedule. There are many methods to solve the UC problem gradually. So, before we present our method, we will show the drawbacks of the standard dynamic programming methods which use general purpose optimization techniques to the UC problem. The priority list method, the lagrange relaxation and the mixed integer linear programming (MILP) are possible to apply to a real power system for performing the unit commitment. However, by using these methods, we could not get an optimal solution but only a suboptimal silution. Therefore we propose to get an optimal solution by using dynamic programming. Performing dynamic programming takes a lot of simulation time, so it is not optimal to use in a real power system for performing the unit commitment. Therefore, we need a modified dynamic programming method to satisfy both the simulated and the real power system to get the optimal solution. For those not familiar with UC problem, we introduce the constraints, production cost and start-up cost. The goal of the objective function is in cost minimization, so we use the economic dispatch using the lambda iteration method when we calculate the production costs. Finally, we compare the UC solution by using both methods.
提出了一种改进的动态规划方法来解决机组投入问题。UC是一个复杂的决策过程,因为在寻找最优或次优承诺时间表时存在多个约束条件,这些约束条件可能不被违反。逐步解决UC问题的方法有很多。因此,在我们提出我们的方法之前,我们将展示使用通用优化技术来解决UC问题的标准动态规划方法的缺点。优先列表法、拉格朗日松弛法和混合整数线性规划(MILP)可以应用于实际电力系统执行机组承诺。然而,使用这些方法,我们不能得到最优解,而只能得到次优解。因此,我们提出用动态规划的方法求出最优解。进行动态规划需要大量的仿真时间,因此在实际电力系统中执行机组承诺并不是最优的。因此,我们需要一种改进的动态规划方法来同时满足模拟和实际电力系统的需求,从而得到最优解。对于不熟悉UC问题的人,我们介绍了约束条件、生产成本和启动成本。目标函数的目标是成本最小化,因此在计算生产成本时,我们使用lambda迭代法进行经济调度。最后,我们比较了使用这两种方法的UC解决方案。
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引用次数: 21
Energy-based hybrid excitation control for synchronous generators 基于能量的同步发电机混合励磁控制
Pub Date : 2010-07-25 DOI: 10.1109/PES.2010.5589516
W. Qiao, Qing Hui
This paper presents an energy-based hybrid control, which replaces the traditional automatic voltage regulator (AVR) for excitation control of a synchronous generator connected to an infinite power system. The proposed controller is based on energy representation of the power system by using a port-controlled Hamiltonian form. The controller uses a hierarchical hybrid architecture characterized by continuous-time dynamics at the lower level of the hierarchy and logical decision-making units at the higher level of the hierarchy. The lower-level units, i.e., the subcontrollers, are each designed for a power system operating mode and directly interact with the power system to be controlled; while the higher-level decision-making units perform logical checks that identify system mode of operation and activates the corresponding lower-level unit; the activated lower-level unit then executes continuous control actions for the power system. Consequently, the controller can adapt to different power system operating modes. Simulation studies are carried out to show the effectiveness of the proposed controller for excitation control of the synchronous generator.
本文提出了一种基于能量的混合控制方法,以取代传统的自动电压调节器(AVR)来控制与无限电力系统相连的同步发电机的励磁。所提出的控制器是基于电力系统的能量表示,使用端口控制的哈密顿形式。控制器采用层次混合体系结构,其特点是在层次结构的较低层次上采用连续时间动力学,在层次结构的较高层次上采用逻辑决策单元。下级单元即子控制器,每一个子控制器都是针对一种电力系统运行方式设计的,并与被控电力系统直接交互;上级决策单位进行逻辑检查,确定系统运行模式并激活相应的下级单位;被激活的下层单元然后对电力系统执行连续的控制动作。因此,该控制器可以适应不同的电力系统运行模式。仿真研究表明了该控制器对同步发电机励磁控制的有效性。
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引用次数: 9
Superheater steam temperature control for a 300MW boiler unit with Inverse Dynamic Process Models 用逆动态过程模型控制300MW锅炉过热器蒸汽温度
Pub Date : 2010-07-25 DOI: 10.1109/PES.2010.5589600
Liangyu Ma, Yongjun Lin, Kwang Y. Lee
An Inverse Dynamic Neuro-Controller (IDNC) is developed to improve the superheater steam temperature control of a 300MW boiler unit. A recurrent neural network was used for building the Inverse Dynamic Process Models (IDPMs) for the superheater system. Two inverse dynamic neural network (NN) models referring to the first-stage and the second-stage water-spray attemperators are constructed separately. To achieve highly accurate approximation of the superheater system, the NN models are trained with sufficient historical data in a wide operating range, which consists of both different steady-state conditions and dynamic transients. Then the IDNCs are designed based on the well-trained IDPMs and applied to superheater steam temperature control. In order to eliminate the steady-state control error arisen by the model error, a simple feedback PID compensator is added to an inverse controller. Detailed control tests are carried out on a full-scope simulator for a 300MW coal-fired power generating unit. It is shown that the temperature control is greatly improved with the IDNCs compared to the original cascaded PID control scheme.
为改善300MW机组过热器蒸汽温度的控制,研制了一种逆动态神经控制器(IDNC)。利用递归神经网络建立了过热器系统的逆动态过程模型。分别建立了一级和二级水喷雾减温器的动态神经网络模型。为了实现对过热器系统的高精度逼近,在广泛的工作范围(包括不同的稳态条件和动态瞬态)中使用足够的历史数据来训练神经网络模型。然后在训练好的idpm的基础上设计idnc,并将其应用于过热器蒸汽温度控制。为了消除模型误差引起的稳态控制误差,在逆控制器中加入了简单的反馈PID补偿器。在300MW燃煤发电机组全范围模拟机上进行了详细的控制试验。结果表明,与原来的级联PID控制方案相比,采用idnc的温度控制效果有很大改善。
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引用次数: 14
Considerations on distance relay setting for transmission line with STATCOM 用STATCOM对传输线距离继电器设置的考虑
Pub Date : 2010-07-25 DOI: 10.1109/PES.2010.5588192
Wenhao Zhang, Seung-Jae Lee, Myeon-Song Choi, S. Oda
The distance relay plays an important role in the protection for transmission lines and application of FACTS devices such as Static Synchronous Compensator (STATCOM) would affect distance relay's performance because of the compensation effect. This paper presents the analytical and simulation results of the application of distance relay for the protection of transmission line containing STATCOM. A typical 500kV transmission system employing STATCOM is modeled using Matlab/Simulink and the impact of STATCOM on distance protection scheme is studied for different fault types, fault locations and system configurations. Based on these analytical and simulation results, the performance of distance relay are evaluated and new setting principle of the distance relay are proposed for the transmission line with STATCOM.
距离继电器在输电线路的保护中起着重要的作用,静态同步补偿器(STATCOM)等FACTS器件的应用会由于补偿作用而影响距离继电器的性能。本文给出了距离继电器在含STATCOM的输电线路保护中的应用分析和仿真结果。利用Matlab/Simulink对采用STATCOM的典型500kV输电系统进行了建模,研究了不同故障类型、故障位置和系统配置下,STATCOM对距离保护方案的影响。在分析和仿真结果的基础上,对距离继电器的性能进行了评价,并针对STATCOM线路提出了距离继电器的整定原理。
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引用次数: 22
CO2 price development in the European power market considering climate objectives 考虑气候目标的欧洲电力市场二氧化碳价格发展
Pub Date : 2010-07-25 DOI: 10.1109/PES.2010.5590221
T. Mirbach, A. Schafer, A. Moser
The implementation of emission certificates in Europe in 2005 has lead to new uncertainties especially for power companies resulting in additional costs for the power generation. The introduction of certificates goes along with political conditions and objectives particularly in the European Union until 2020. In consequence, these regulations take influence on the power plant scheduling as well as on market prices for electrical energy and CO2 certificates. By using market simulation methods which simulate supply and demand for electrical energy the price development of the emission certificates can be investigated based on system marginal costs for CO2 emissions. In view of these circumstances this paper presents investigations on the CO2 price development in the European power market for different scenarios up to 2020 e.g. concerning the power generation park as well as the demand of electrical energy based on a market simulation method.
2005年欧洲实施的排放证书制度带来了新的不确定性,特别是对电力公司来说,这导致了发电成本的增加。证书的引入符合政治条件和目标,特别是在欧盟,直到2020年。因此,这些法规对发电厂的调度以及电能和二氧化碳证书的市场价格产生了影响。利用模拟电力供需的市场模拟方法,研究基于CO2排放系统边际成本的排放证书价格发展。鉴于这些情况,本文提出了对欧洲电力市场的二氧化碳价格发展的不同情景的调查,到2020年,例如,关于发电园区以及基于市场模拟方法的电能需求。
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引用次数: 4
Impact on utilization factor with increasing wind power penetration level in Jeju Island 济州岛风力发电普及率提高对利用系数的影响
Pub Date : 2010-07-25 DOI: 10.1109/PES.2010.5590000
Jin-Woo Park, G. Pyo, S. Moon
Many Korean companies are eager to construct wind farms in Jeju Island, thanks to the Government's policy of supporting renewable energy. Total capacity of planned wind farm is 250MW and government's target is 500MW. At the same time local government of Jeju Island has plans to build new 300MW LNG power plant or 400MW HVDC#2 with mainland. However local power demand of Jeju Island will not be increased largely in near future. Therefore the utilization factors of conventional units are to be decreased significantly. Over construction compare with scale of Jeju power system is worried in this case, it is needed to verify the feasibility of both plans. In this research, the impact on utilization factor of conventional units and HVDC transmission with increased wind power penetration level is presented. And impact of devices planned - LNG, HVDC- is also investigated. The best way for Jeju Island case to increase wind power is presented in this paper.
由于政府支持可再生能源的政策,许多韩国公司都渴望在济州岛建设风力发电场。规划的风电场总容量为250兆瓦,政府的目标是500兆瓦。与此同时,济州岛地方政府计划与大陆新建300兆瓦的LNG发电厂或400兆瓦的HVDC 2号。但是,短期内济州岛的电力需求不会大幅增加。因此,常规机组的利用系数将显著降低。在这种情况下,与济州电力系统的规模相比,令人担忧的是过度建设,有必要对两个计划的可行性进行验证。研究风电穿透水平的提高对常规机组和直流输电利用系数的影响。并对LNG、HVDC等设备的影响进行了研究。以济州岛为例,提出了增加风电的最佳途径。
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引用次数: 2
The Tres Amigas Superstation: Linking renewable energy and the nation's grid (July 2010) 特雷斯阿米加斯超级电站:连接可再生能源和国家电网(2010年7月)
Pub Date : 2010-07-25 DOI: 10.1109/PES.2010.5590084
Z. Alaywan
New Wind generating facilities are the fastest renewable resource to install and interconnect to the power grid. Wind generation, however, presents the largest operational challenges. Wind generation energy production is extremely variable; it often produces its highest energy output when the demand for power is at a low point. During some periods of the year, wind generation is difficult to forecast because it does not follow a predictable day-to-day production pattern. In general, wind generation has a pattern of maximum wind generation at night, a ramp down of energy production during the morning load pick up period, and a ramp up of generation in the evening. Integration of large amounts of wind generation is technically feasible, but there are transmission, operating and forecasting challenges. The West Texas wind CREZ, Southwest Power Pool (SPP), West Texas wind expansion and eastern New Mexico renewable collector system will add 12,00 to 20,00MW of predominately wind and solar energy to the grid.
新的风力发电设施是最快安装并连接到电网的可再生资源。然而,风力发电带来了最大的运营挑战。风力发电的能源产量变化很大;它通常在电力需求处于低谷时产生最高的能量输出。在一年中的某些时期,风力发电很难预测,因为它不遵循可预测的日常生产模式。一般情况下,风力发电具有夜间风力发电量最大,上午负荷回升期间发电量下降,晚上发电量上升的模式。大量风力发电的整合在技术上是可行的,但存在传输、运行和预测方面的挑战。西德克萨斯风能CREZ、西南电力池(SPP)、西德克萨斯风能扩展和新墨西哥东部可再生能源收集系统将为电网增加1.2万至2万兆瓦的风能和太阳能。
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引用次数: 11
The implication and implementation of smart grid in China 智能电网在中国的含义与实施
Pub Date : 2010-07-25 DOI: 10.1109/PES.2010.5589979
T. Bi, Sumei Liu, Zhenyu Huang, N. Hadjsaid
In recent years, smart grid becomes the trend of future power systems in China and abroad. Present status and the facing challenges of electric power industries in different countries are different, and thus the understanding and the development plan of smart grid are also different from one country to another. In this paper, the motivations and implications of smart grid in USA, Europe and China are compared. Furthermore, the implementation and the key technologies of smart grid in China are introduced.
近年来,智能电网已成为国内外未来电力系统发展的趋势。各国电力行业的现状和面临的挑战不同,因此各国对智能电网的认识和发展规划也不同。本文比较了美国、欧洲和中国发展智能电网的动机和意义。此外,还介绍了中国智能电网的实施情况和关键技术。
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引用次数: 13
Impacts of bulk wind generation and waste-to-energy on the economic operation of the Puerto Rico Electric Power Authority system 大规模风力发电和垃圾发电对波多黎各电力局系统经济运行的影响
Pub Date : 2010-07-25 DOI: 10.1109/PES.2010.5590056
A. del Rosso, D. Brooks, Yolanda Ramos Jusino
The Puerto Rico Electric Power Authority (PREPA) supports an orderly development of the renewable energy potential on the islands. To attain this goal, PREPA is conducting science-based analytical studies and research to increase knowledge on these technologies. As part of this effort, PREPA commissioned the Electric Power Research Institute (EPRI) to assess the potential impacts that different penetration levels of waste-to-energy (WTE) and wind generation on PREPA power system operations. The study covered different technical and economic aspects of wind integration. This paper summarizes the impact of hourly wind power variability and wind generation forecast uncertainty on system operation cost The analytical approach and evaluation results are described.
波多黎各电力管理局(PREPA)支持岛上可再生能源潜力的有序发展。为了实现这一目标,PREPA正在开展以科学为基础的分析研究,以增加对这些技术的了解。作为这项工作的一部分,PREPA委托电力研究所(EPRI)评估不同渗透水平的废物发电(WTE)和风力发电对PREPA电力系统运行的潜在影响。这项研究涵盖了风能整合的不同技术和经济方面。总结了风电小时变异性和风电预测不确定性对系统运行成本的影响,给出了分析方法和评估结果。
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引用次数: 0
Estimating energy imbalance due to integration of wind power 风电整合后的能量不平衡估算
Pub Date : 2010-07-25 DOI: 10.1109/PES.2010.5589283
E. Sortomme, R. R. Irani, H. V. Nguyen, M. El-Sharkawi
As demand for clean renewable sources of energy continues to grow, utilities will increasingly rely on wind power to fit that demand. This paper presents a Wind Energy Imbalance Estimation Technique (WEIET). The WEIET estimates the impact on the system energy imbalance from integrating new wind generating facilities. The area control error (ACE) is used in the WEIET to account for the imbalance of the load as well as other system components. The method relies on known and calculable quantities derived from the ACE equation taking into account the additional automatic generation control (AGC) response to the wind schedule/actual mismatch. In its simplest form, this method provides the worst case scenario of the impact on the system reliability metrics from additional wind facilities. This simplest form is easily implementable on all systems. More comprehensive analysis can be performed by expanding on the simplest form. Simulation results on a northwest utility system verify that the proposed technique predicts the impact of integrating an actual wind facility into the balancing area.
随着对清洁可再生能源的需求持续增长,公用事业将越来越依赖风能来满足这种需求。提出了一种风能不平衡估计技术(weet)。weet估计了整合新的风力发电设施对系统能量不平衡的影响。区域控制误差(ACE)在WEIET中用于解释负载以及其他系统组件的不平衡。该方法依赖于从ACE方程中导出的已知和可计算的量,并考虑到风力计划/实际失配的附加自动发电控制(AGC)响应。在其最简单的形式中,该方法提供了额外风力设施对系统可靠性指标影响的最坏情况。这种最简单的形式很容易在所有系统上实现。通过在最简单的形式上展开,可以执行更全面的分析。对西北某公用事业系统的仿真结果验证了所提出的技术对实际风电设施纳入平衡区影响的预测。
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引用次数: 1
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IEEE PES General Meeting
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