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1.
基于虚拟同步发电机的风电场并网控制研究   总被引:4,自引:0,他引:4       下载免费PDF全文
随着风力发电容量占电网容量的比重不断加大,风电场对电网稳定性的影响也越来越大。同步发电机具有调节系统功率平衡,维持电网电压稳定的作用,并具有自同步特性,适于系统并联。通过在风电场交流侧配置储能电池,并对储能系统的逆变器采取基于同步发电机模型的控制策略,将风电场等效为虚拟同步发电机(Virtual Synchronous Generator-VSG),使风电场向电网输送的功率平滑,并对大电网体现同步发电机的特性。根据负荷的波动,调节自身输出功率,维持系统频率与电压稳定,有效提高了大规模风电场并网性能。建立了由风力发电机组、储能电池及汽轮发电机组组成的系统仿真模型,仿真结果验证了控制策略的可行性。  相似文献   

2.
飞轮辅助的风力发电系统功率和频率综合控制   总被引:14,自引:2,他引:12  
参与电网频率控制是并网运行发电机组应有的功能。该文在分析风力发电对电力系统运行影响的基础上,提出了一种用飞轮辅助风力发电的方案,研究了风力发电-飞轮系统功率和频率综合控制方法,建立了相应的Simulink仿真模型,用实际风速对飞轮平稳风力发电机输出功率波动、参与电网频率控制进行了仿真。结果表明,在飞轮辅助下,风力发电-飞轮系统可以按要求输出平稳的功率,并且可以像传统发电机组一样参与电网频率控制。  相似文献   

3.
大规模非并网风力发电避开了风电并网的技术难题。针对大规模非并网风力发电系统,提出一种飞轮储能系统辅助的风力发电方案,研究了飞轮储能系统对于非并网风力发电系统直流母线电压和输出功率的控制方法,建立了相应的Simulink仿真模型,用模拟实际风速对飞轮储能系统平稳非并网风力发电系统输出功率进行了仿真。结果表明,在飞轮储能系统的辅助下,非并网风力发电机组可以按要求输出功率曲线以满足负荷需求,并在直流母线发生故障时,飞轮储能系统加速输出所储存的能量以稳定整个风力发电机组-飞轮储能系统输出功率。  相似文献   

4.
风力发电具有随机性和间歇性等特点,大量风电的接入对电网的稳定运行带来了不可忽视的影响。详细分析了风电场各个环节的数学模型,包括风力涡轮机、传动系统和风力发电机三个部分;基于PSASP的用户程序接口(UPI),采用VC编写了用于风电场潮流和稳定计算的用户程序;结合河南方城风电场的实际情况,研究了风电场无功补偿容量的确定以及出口功率因数与转子滑差的关系;仿真分析了风力发电机组并网时对电网产生的冲击影响,并对风电场接入电网后的稳定性进行分析。仿真结果验证了所采用模型的正确性和实用性。  相似文献   

5.
建立了无刷双馈电机的数学模型和仿真模型,引入了并网型无刷双馈电机发电系统,同时建立了风力发电系统中矩阵变换器的仿真实验模型,在Matlab/Simulink中分别对并网型无刷双馈发电系统零初始状态启动到稳态运行状态、风速变化、浆距角变化、无刷双馈电机参数变化等情况进行了动态仿真。仿真结果表明并网型无刷双馈发电机模型和运行特性的正确性,为并网型无刷双馈风力发电机组的进一步应用研究提供了可靠的依据。  相似文献   

6.
陈荣德 《风力发电》1995,(1):27-29,10
在风力发电技术中并网型的风力发电机组是主要的机组型式,而异步发电机是并网型风力发电机组的主要部件之一。要实现我国风力发电机组的国产化,制造适合风力发电需要的不发电机是关键技术。作者曾参与国产200kW、55kW和10kW风力发电机组的设计、制造和安装调试工作,对风力发电机的运行环境和使用条件有一定的了解。  相似文献   

7.
风力发电机控制系统空载并网控制策略直接关系到发电机并网瞬间对大电网稳定的影响,通过对双馈型异步发电机空载并网情况下网侧变流器和转子侧变流器控制策略进行了研究,分别采用定子磁链定向和定子电压定向控制策略实现了空载并网和网侧变流器控制,将发电机参数的有功分量和无功分量进行了解耦控制,同时保证功率因数的恒定.在实时数字仿真平台中搭建了双馈型风力发电系统的空载并网模型,仿真结果验证了所提出控制策略的正确性.  相似文献   

8.
失速型风力发电机组软并网技术研究   总被引:1,自引:1,他引:0  
介绍了异步风力发电机组软并网原理,分析了基于晶闸管进行软并网的控制过程.软并网系统由反并联晶闸管、控制电路及其保护电路组成,中央处理器采用Atmel 89C51单片机.当晶闸管两端施加反向电压时可以自然关断,通过调节晶闸管的导通角即可调节发电机定子电压.控制加在发电机定子上的电压按阶梯渡的形式从某一较小的初值逐渐增加到全压状态,从而使风力发电机组并网电流控制在一定范围内,大幅降低并网时的冲击电流.根据S48/750风力发电机参数建立了Simulink仿真模型,对失速型异步风力发电机组的并网过程进行了仿真.所设计的系统在750 kW机组上做了软并网实验.仿真和实验结果表明,采用晶闸管软并网系统可以有效抑制冲击电流,使失速型异步风力发电机组平稳并网.  相似文献   

9.
串并联型超级电容器储能系统在风力发电中的应用   总被引:10,自引:1,他引:9  
基于超级电容器的串并联型储能系统可同时双向大范围快速调节有功功率和无功功率。为提高风力发电系统稳定性和改善电能质量,提出了一种将串并联型超级电容器储能系统应用于基于异步发电机的风力发电系统的新思路,建立了基于等效电路的超级电容器储能系统的动态数学模型,设计了相应的控制策略,并以随机风和电网大扰动为例,在Matlab的Simulink环境下对采用串并联型超级电容器储能系统对并网风力发电机组的电能质量和稳定性问题进行仿真。结果表明采用该控制策略的超级电容器储能系统可很好地改善并网风力发电机组的电能质量和稳定性。  相似文献   

10.
针对风力发电系统发电机转速波动较频繁,难于同时对电压和频率的稳定性实施控制等特点,结合直流发电机的工作特性,提出了基于直流发电机的风力发电系统控制技术。采用基于遗传算法的最优励磁控制技术对发电机的励磁实施控制,使发电机获得了稳定的输出电压。从理论上分析了直流风力发电系统的可行性及其特点,重点分析和研究了基于遗传算法的直流风力发电机组最优励磁控制技术在稳定输出电压方面的性能,运用Matlab对该系统进行了仿真,并用直流电动机作原动机,通过调节电动机的转速模拟风速变化引起的风力机转速变化。在电力系统动态模拟试验室中进行了大量实验,通过比较和分析获取的数据和仿真结果,进一步验证了该方法的正确性和可行性。  相似文献   

11.
建立了风电机组和超导储能(superconducting magnetic energy storage,SMES)装置的数学模型以研究SMES对并网风电场运行稳定性的改善。针对风电系统中经常出现的联络线短路故障和风电场的风速扰动,提出利用SMES安装点的电压偏差作为SMES有功控制器的控制信号的策略。并搭建了风电场接入电网后的仿真模型,对实例系统进行的仿真计算结果表明,SMES采用该控制策略,不仅可以在网络故障后有效地提高风电场的稳定性,而且能够在快速的风速扰动下平滑风电场的功率输出,降低风电场对电网的冲击。  相似文献   

12.
超导储能改善并网风电场稳定性的研究   总被引:20,自引:0,他引:20  
建立了风电机组和超导储能(SMES)装置的数学模型以研究SMES对并网风电场运行稳定性的改善.针对风电系统中经常出现的联络线短路故障和风电场的风速扰动,提出利用SMES安装点的电压偏差作为SMES有功控制器的控制信号的策略.对实例系统进行的仿真计算结果表明,SMES采用该控制策略,不仅可以在网络故障后有效地提高风电场的稳定性,而且能够在快速的风速扰动下平滑风电场的功率输出,降低风电场对电网的冲击.  相似文献   

13.
The intermittent wind power in isolated hybrid distributed generation (IHDG) may cause serious problems associated with frequency (f) and power (P) fluctuation. Energy storage devices such as battery, super capacitor, and superconducting magnetic energy storage (SMES) may be used to reduce these fluctuations associated with f and P. This paper presents a study of IHDG power system for improving both f and P deviation profiles with the help of SMES. The studied IHDG power system is consisted of wind turbine generator and diesel engine generator. Both f and P control problems of the studied power system model are addressed in presence or absence of SMES. Fuzzy logic based proportional–integral–derivative (PID) controller with SMES is used for the purpose of minimization of f and P deviations. The different tunable parameters of the PID controller and those of the SMES are tuned by a novel quasi-oppositional harmony search algorithm. Performance study of the IHDG power system model is carried out under different perturbation conditions. The results demonstrate minimum f and P deviations may be achieved by using the proposed fuzzy logic based PID controller along with SMES.  相似文献   

14.
The fast variations of wind speed during extreme wind gusts result in fluctuations in both generated power and the voltage of power systems connected to wind energy conversion system (WECS). This paper presents a control strategy which has been tested out using two scenarios of wind gusts. The strategy is based on active and reactive powers controls of superconducting magnetic energy storage (SMES). The WECS includes squirrel cage induction generator (SCIG) with shunt connected capacitor bank to improve the power factor. The SMES system consists of step down transformer, power conditioning unit, DC–DC chopper, and large inductance superconducting coil. The WECS and SMES are connected at the point of common coupling (PCC). Fuzzy logic controller (FLC) is used with the DC–DC chopper to control the power transfer between the grid and SMES coil. The FLC is designed so that the SMES can absorb/deliver active power from/to the power system. Moreover, reactive power is controlled to regulate the voltage profile of PCC. Two inputs are applied to the FLC; the wind speed and SMES current to control the amount active and reactive power generated by SMES. The proposed strategy is simulated in MATLAB/Simulink®. The proposed control strategy of SMES is robust, as it successfully controlled the PCC voltage, active and reactive powers during normal wind speeds and for different scenarios of wind gusts. The PCC voltage was regulated at 1.0 pu for the two studied scenarios of wind gusts. The fluctuation ranges of real power delivered to the grid were decreased by 53.1% for Scenario #1 and 56.53% for Scenario #2. The average reactive power supplied by the grid to the wind farm were decreased by 27.45% for Scenario #1 and 31.13% for Scenario #2.  相似文献   

15.
High temperature Superconducting Magnetic Energy Storage(SMES) systems can exchange energy with substantial renewable power grids in a small period of time with very high efficiency. Because of this distinctive feature, they store the abundant wind power when the power network is congested and release the energy back to the system when there is no congestion. However, considering the cost and lifespan of SMES systems, there is an urgent demand to conduct a cost-benefit analysis to justify its role in smart grid development. This study explores the application and performs economic analysis of a 5 MJ SMES in a practical renewable power system in China based on the PSCAD/EMTDC software. An optimal location of SMES in Zhangbei wind farm is presented using real power transmission parameters. The stabilities of the renewable power grid with and without SMES are discussed. In addition, a financial feasibility study is conducted by comparing the cost and the savings from wind power curtailment of deploying SMES and battery. The economic analysis tries to find the balance between SMES investment cost and wind farm operation cost by using real data over a calendar year. The technical analysis can help guide the optimal allocation of SMES for compensating power system instability with substantial wind power. Further, the economic analysis provides a useful indication of its practical application feasibility to fight the balance between cost and benefit.  相似文献   

16.
双馈型风力发电机面临能量输出不稳定和低电压穿越能力弱2个主要问题。为了同时解决这2个问题,提出了一种集成超导储能系统和电流型串联网侧变流器的双馈型风力发电系统。该系统利用超导磁体作为能量储存和缓冲环节,提高了能量输出的稳定性;利用电流型串联网侧变流器实现了对定子电压的保护,提升了双馈型风力发电机的低电压穿越能力。仿真结果证明了该拓扑结构及其控制策略的有效性。  相似文献   

17.
应用超导储能系统(SMES) 对提高风电场的暂态稳定性进行了研究。在深入研究超导储能系统运行原理的基础上,建立了基于电压型换流器(VSC)的超导储能系统模型,实现了有功功率和无功功率的解耦控制,并提出了有功、无功功率综合控制策略。利用PSCAD/EMTDC软件进行了仿真计算,结果说明超导储能系统不但能够在风速波动时平滑风电场的功率输出,而且能够提高风电系统的暂态稳定性。  相似文献   

18.
基于超导储能系统的风电场功率控制系统设计   总被引:21,自引:6,他引:15       下载免费PDF全文
风电场输出功率的波动性和间歇性会给电网带来不利的影响。为了降低风电场并网对电能质量的影响,文中阐述了一种基于超导储能系统的抑制风电场功率波动的间接控制方法。利用超导储能系统的四象限功率运行能力来补偿风电场输出的有功和无功功率波动,并抑制由此产生的电网电压波动;通过合理设计超导储能系统功率调节器的带宽来优化储能量。通过对风电场连接于弱电网的仿真,验证了所提出的功率控制策略的有效性。  相似文献   

19.
为了研究超导储能系统在改善并网风电场出力的作用,利用PSCAD仿真软件搭建了风电场模型、超导储能模型和4机12节点电力系统多机模型。研究了在多机模型下3种风速变化,以及在短路情况下,超导储能装置在并网风电场中所起的作用。结果表明,超导储能装置可以很好地抑制风电场的出力波动,从而使整个系统在多机、短路等情况下能更为稳定地运行。  相似文献   

20.
It has been clarified that a superconducting magnetic energy storage (SMES) is very effective for power system stabilization. The control methods proposed for power system stabilization by SMES are the pole assignment, the optimal control, and so on, each of which, however, has its drawbacks. This paper is concerned with the power system stabilization by neural network control of the active power of SMES. First, the optimal stabilizing control of the SMES power for the model power system is calculated for various power system operating conditions and fault conditions. Then these optimal controls are used as training data for the neural network. The neural network used is a multilayer type with a feedback from the output layer to the input layer. The trained neural network is examined by untrained operating conditions and faults.  相似文献   

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