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通过对唐山恒通精密薄板有限公司 (以下简称唐山恒通 )所产生的谐波对电网及用户本身设备危害的分析 ,提出谐波监测的必要性和治理措施。为当前供电系统谐波管理提供了可借鉴的经验 相似文献
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通过对唐山丰南恒通精薄板有限公司(以下简称丰南恒通)所产生的谐波对电网及用户本身设备危害的分析,提出谐波监测的必要性和治理措施;为当前供电系统谐波管理提供了可借鉴的经验。 相似文献
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通过对唐山恒通精密薄板有限公司(以下简称唐山恒通)所产生的谐波对电网及用户本身设备危害的分析,提出谐波监测的必要性和治理措施。为当前供电系统谐波管理提供了可借鉴的经验。 相似文献
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介绍天津百思特制管有限公司10kV配电系统谐波治理过程中的测试分析、参数设计及谐波治理后的效果评估等情况。 相似文献
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配电网谐波治理降损效果实证方法 总被引:1,自引:0,他引:1
针对配电网谐波治理前后的负荷水平不完全一致所导致的谐波治理真实节能效果无法量化的问题,以将谐波治理前后的负荷状态化归至同一水平为目标,提出了配电网谐波治理降损效果实证方法。首先对主要电力设备谐波损耗倍数进行原理分析;进而得到谐波损耗的数学模型,并给出了配电网谐波损耗与基波损耗的关系;最后将谐波治理前后的网络基波损耗值化归为同一基准,提出了谐波损耗折算值求解的方法,得到了谐波治理后的真实节能量,并通过算例验证了本方法的实用性和有效性。 相似文献
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谐波主要是由称为谐波源的大功率换流设备及其它非线性负荷产生。谐波源产生的谐波不但危及电网及其它电力用户,而且也危及自身,因此,谐波的治理是十分必要且有实际经济效益的。本文以大明铝合金型材有限公司为实例,对谐波的产生及治理方案进行了分析研究。治理方案充分考虑了经济和技术方面因素,既获得良好治理效果又节约了成本。 相似文献
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Harmonic distortion caused by increasing size of inverter-based distributed generation (DG) can give rise to power quality problems in distribution power networks. Therefore, it is very important to determine allowable DG penetration level by considering the harmonic related problems. In this study, an optimization methodology is proposed for maximizing the penetration level of DG while minimizing harmonic distortions considering different load profiles. The methodology is based on updating the voltage magnitude and angle at point of common coupling depending on the size of DG to be utilized in the harmonic power flow modeling. The harmonic parameters are determined by using decoupled harmonic power flow method, in which the harmonic source modeling with harmonic current spectrum angle adjustment is embedded, while the nonlinear loads and inverter-based DGs are connected to the distribution power network. The allowable penetration level of DGs is determined based on power quality constraints including total harmonic voltage distortion, individual harmonic voltage distortion, and RMS bus voltage limits in the optimization framework. Fuzzy-c means clustering method is also applied to decrease the computational effort of the optimization process in the long-term load profile. The effectiveness of the proposed method is illustrated on the IEEE 33-bus radial distribution network for different scenarios. 相似文献
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唐山供电公司本着"谁干扰、谁污染,谁治理"的原则,有计划、有步骤地对谐波源用户开展谐波测试工作。对谐波超标的单位下达整改通知书,令其整改,效果明显。为唐山电网的安全、稳定、经济运行发挥了一定的作用。 相似文献
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唐山供电公司对谐波源用户的谐波测试及治理 总被引:1,自引:0,他引:1
唐山供电公司本着"谁干扰、谁污染,谁治理"的原则,有计划、有步骤地对谐波源用户开展谐波测试工作。对谐波超标的单位下达整改通知书,令其整改,效果明显。为唐山电网的安全、稳定、经济运行发挥了一定的作用。 相似文献
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电气化铁路用混合电力滤波器的研究 总被引:25,自引:16,他引:25
该文针对电气化铁道谐波、无功的综合治理要求和特点提出了一种新型的混合型电力滤波器,它由TSF(晶闸管投切滤波器)和APF(有源电力滤波器)构成。通过分析混合滤波器谐波补偿原理,文中提出了一种复合控制策略。在负载功率为1MVA的中功率试验装置上得到的试验结果证明了此方案的有效性。 相似文献
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Anthoula Menti Thomas Zacharias John Milias-Argitis 《Electrical Engineering (Archiv fur Elektrotechnik)》2009,91(2):89-100
In this paper, the optimal sizing and limitations of shunt, passive, single-tuned harmonic filters for industrial loads are
examined. The investigation takes into account not only harmonic current sources due to nonlinear loads, but also the presence
of background voltage harmonic distortion. First, an analytical approach in simplified cases is developed, which leads to
closed form expressions. These expressions help in gaining a deeper insight into the role of the filter branches and the influence
of the various parameters of the system. They also show, both quantitatively and qualitatively, the limitations of passive
filters with respect to harmonic control. Next, the general case of this constrained optimization problem is formulated and
solved using genetic algorithms. The constraints ensure acceptable solutions in accordance with Standard recommendations,
utility regulations and filter parameter variations. The proposed objective function to be maximized is a modified version
of the power factor and ensures the optimal solution among acceptable ones. Through extensive simulations of an example system
for a variety of voltage and current harmonic levels, potentialities and limitations of filter branches are thoroughly investigated.
Practical conclusions drawn can be considered as guidance on engineering judgment for harmonic control in any specific application. 相似文献
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基于比例复数积分控制的单相逆变器并网研究 总被引:1,自引:0,他引:1
设计了一种具有零稳态误差和低谐波注入的单相并网逆变器控制系统,系统的控制器由比例调节器K和复数积分调节器构成。与传统PI控制器相比,比例复数积分控制器(PCI)在基波频率处增益无穷大,因此可以完全消除稳态误差。通过理论分析,构造了单相系统虚拟的伪三相静止坐标系进行坐标变换,利用由旋转坐标系实现复数域的实数化。理论分析和仿真实验结果都证明了系统具有良好的稳态性能和抗干扰性能,并且对并网电流有一定的谐波抑制作用。 相似文献
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级联多电平逆变器因其具有众多优点,在高压大功率应用场合受到了越来越多的关注。混合级联多电平逆变器是级联多电平逆变器的一种特殊形式,它可以采用尽可能少的功率器件和独立直流电压源,得到尽可能多的电平数。本文混合级联多电平逆变器的直流侧采用1:3:9的电压比例,控制策略采用最近电平逼近调制(NLM),得到了27个电平数的输出电压,推导出输出电压的Fourier级数表达式,计算了理论上基波、谐波特性。最后通过Saber的联合仿真功能,仿真验证了最近电平逼近调制方法的有效性和基波、谐波特性的正确性。 相似文献
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Instead of injecting harmonic currents to compensate those drawn by distorting loads, in this paper a shunt active filter is used for generating harmonic voltages to compensate harmonic voltages at the point of common coupling; the main advantage in using such a compensation approach is that, when the aim is to reduce or eliminate the harmonic voltages at the point of common coupling only one active filter is required. For determining the harmonic voltages such a filter must generate, two simple and practical methods are proposed in this paper; the effectiveness of these methods was evaluated using a 1-kW prototype of an active filter operating according to the shunt harmonic voltage compensation approach. In addition, the laboratory results were comparable to those obtained with the ATP-EMTP simulation software. 相似文献
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用户装设交流滤波装置后,背景谐波电压也会引起PCC点谐波电流超标。通过该类典型工程实例各种工况下的测试结果,分析背景谐波电压引起其谐波超标的原因,并通过谐波潮流分析阐明其谐波超标的机理,提出解决问题的相关措施。实践结果和理论分析表明分析方法的有效性和可行性,在工程应用中可分析、解决相关问题。 相似文献