光伏逆变器控制参数的分步辨识方法

发布时间：2018-05-24 23:28

本文选题：光伏发电 + 逆变器　；参考：《电网技术》2015年03期

【摘要】：由于光伏逆变控制器的内外环之间是级联关系,在以往一次侧制造短路以产生电压跌落,或者在控制器参考值上制造阶跃扰动的激励下,参数存在不可唯一辨识的问题。为此,提出了一种在二次侧量测信号上施加扰动的方法,称为虚拟量测激励。其突出优点是施加某个量测信号激励时可以屏蔽其他量测信号的变化,从而可以实现内外环控制器动作的解耦,进而解决参数的可辨识性问题。在此基础上,提出了一种光伏逆变器控制参数的分步辨识方法。该方法首先使用电容电压量测信号的方波和正弦激励,先后辨识得到电压外环的积分和比例系数;然后在屏蔽并网点电压和电容电压量测信号变化的条件下,利用并网点电流q轴量测信号的正弦激励确定电流内环3个控制参数的比例;再通过测量或辨识方法得到电感参数的数值后,即可获得电流内环的全部控制参数值。如果电感参数可测量,则整套方法都不需要使用优化算法。仿真算例表明了该方法的可行性。
[Abstract]:Because of the cascade relationship between the inner and outer loops of the photovoltaic inverter controller, there is a problem that the parameters can not be uniquely identified when the voltage drop is caused by a short circuit at the previous side or the step disturbance is made on the reference value of the controller. For this reason, a new method called virtual measurement excitation is proposed, in which the disturbance is applied to the secondary side measure signal. Its outstanding advantage is that the variation of other measurement signals can be shielded when a measurement signal is excited, so that the decoupling of the internal and external loop controller can be realized, and the problem of parameter identifiability can be solved. Based on this, a step-by-step identification method for control parameters of photovoltaic inverter is proposed. In this method, the square wave and sinusoidal excitation of the capacitance voltage measurement signal are used to identify the integral and the proportional coefficient of the voltage outer loop successively, and then under the condition of shielding and measuring the voltage of the capacitance voltage and the measuring signal of the dot voltage and the capacitance voltage, the integral and the proportional coefficient of the voltage outer loop are obtained successively. The proportion of three control parameters of the current inner loop is determined by using the sine excitation of the measurement signal of the Q axis of the parallel dot current, and the value of the inductance parameter is obtained by measuring or identifying method, all the control parameters of the current inner loop can be obtained. If inductance parameters can be measured, the whole method does not need to use an optimization algorithm. A simulation example shows the feasibility of the method.
【作者单位】：河海大学能源与电气学院;中国电力科学研究院;
【基金】：国家自然科学基金项目(51407059) 国家高技术研究发展计划(863计划)(2011AA05A103)~~
【分类号】：TM464

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