含分布式光储发电的主动配电网无功控制方法研究

发布时间：2018-03-23 17:18

本文选题：PWM变流器　切入点：直接功率控制　出处：《沈阳工业大学》2016年硕士论文

【摘要】：伴随着光伏、风力发电等诸多可再生能源发电比重的持续提升以及环保意识的增强和能源压力的增加,高渗透率环境下的新能源发电的不间断随机接入,为配电网的顺利运作提出了新的要求。主动配电网是一种能够实现充放电设备和电网互动、大规模间歇式新能源并网运行控制以及智能配用电等诸多电网运行和剖析的关键技术的高效、合理地处理方案。怎样研发制造有关智能电力设备,并实施无功补偿、电压调节、谐波治理、可再生能源的接入与转换是当前电力电子设备亟待解决的关键性问题。本文主要以主动配电网环境下电能转换与电能质量的共通的重要技术问题、脉冲宽度调制(PWM)为对象展开具体地分析与探索,从而达成高质量、动态化的控制作用的目标。同时,开展了信号检测、自理论分析、仿真探索、实验检验再至详细程序的代码的实现、功率分析、控制手段的探索以及数学建模等工作,从而在技术与理论方面为主动配电网有关智能电能电力设备的研发、制造打下基础。本篇论文的工作主要有:(1)创设数学模型,开展功率分析计算工作。运用开关函数描述法确定在abc静止坐标系下,三相电压型PWM变流器的数学模型。从瞬时功率理论中我们可推导出abc静止坐标系下功率计算公式,通过对坐标变换的手段的分析,获取到等功率变换与等量变换的静止坐标系以及dq同步旋转坐标系下的功率的计算。(2)对PWM变流器主要发挥出逆变与整流功能,站在电力系统无功功率与瞬时有功功率控制的角度,制定一种新式的准直接功率控制方案。运用外环功率与内环定频的结构,在考虑到电流内环保护的基础上严格控制功率流向。另外,提供控制仿真结果与控制器参数设计手段,从仿真结果中可看出PWM变流器的高质量、动态控制目标的达成状态。(3)出具在abc坐标的基础上的PWM变流器自然坐标控制手段,它涵盖了无交流电压传感器控制手段、直接电流控制手段以及直接功率控制手段。就PWM变流器交流侧的相电压以及工程积分替换以往的微分方式,得到与每相磁链相近的值,依靠磁链估算与相电压估算模块达到无交流电压传感器控制的目标。依据新式的准直接功率控制策略的理念,通过功率外环、电流内环的手段,做好基于自然坐标下的直接功率控制工作。
[Abstract]:With the continuous increase in the proportion of renewable energy generation, such as photovoltaic, wind power generation and so on, as well as the increasing awareness of environmental protection and the increase of energy pressure, the uninterrupted random access of new energy generation in high permeability environment. New requirements are put forward for the smooth operation of distribution network. Active distribution network is a kind of active distribution network that can realize the interaction between charging and discharging equipment and power grid. How to develop and manufacture intelligent power equipment, how to develop and manufacture intelligent power equipment, how to implement reactive power compensation and voltage regulation, how to deal with the key technologies of power grid operation and analysis, such as large-scale intermittent new energy grid operation control and intelligent distribution power supply, etc. Harmonic control, access and conversion of renewable energy are the key problems to be solved urgently in power electronic equipment. In this paper, the important technical problems of power conversion and power quality in active distribution network environment are discussed. Pulse width Modulation (PWM) is the object of specific analysis and exploration, so as to achieve the goal of high quality and dynamic control. At the same time, signal detection, self-theoretical analysis and simulation exploration are carried out. The realization of code, power analysis, exploration of control means and mathematical modeling, etc., in order to develop intelligent power equipment for active distribution network in technology and theory. The main work of this paper is to create a mathematical model and carry out power analysis and calculation. The switching function description method is used to determine the abc stationary coordinate system. The mathematical model of three-phase voltage source PWM converter. From the instantaneous power theory, we can deduce the power calculation formula in the abc stationary coordinate system, through the analysis of the means of coordinate transformation, The static coordinate system of equal power transformation and equal quantity transformation and the power calculation in dq synchronous rotation coordinate system are obtained. The main functions of inverter and rectifier for PWM converter are obtained. From the point of view of reactive power and instantaneous active power control in power system, a new quasi-direct power control scheme is developed. Considering the current inner loop protection, the power flow direction is strictly controlled. In addition, the control simulation results and controller parameter design means are provided. From the simulation results, the high quality of the PWM converter can be seen. The natural coordinate control method of PWM converter based on abc coordinates, which covers the control means without AC voltage sensor, Direct current control and direct power control. For the phase voltage and engineering integral of the AC side of the PWM converter, the previous differential method is replaced, and the value is close to that of each phase flux. Based on the idea of new quasi-direct power control strategy, the method of power outer loop and current inner loop is used to achieve the goal of non-AC voltage sensor control based on flux estimation and phase voltage estimation module. Do a good job of direct power control based on natural coordinates.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM727

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