基于虚拟仪器技术的飞机电压调节器动态性能测试方法研究

分析了飞机电压调节器与发电机信号的交联关系,介绍了一种基于虚拟仪器技术的飞机电压调节器动态性能测试系统的设计。采用程控电源模拟飞机发电机,并应用BP神经网络成功地建立了飞机直流发电机非线性模型。重点讨论了该测试系统的虚拟仪器配置方案和测试流程。     

基于CompactRIO的脉冲发电机励磁调节器

以CompactRIO作为硬件平台,采用基于图形的LabVIEW编程语言,开发了适用于脉冲工作模式下的同步发电机励磁调节器。该调节器主要包括上位机和嵌入式实时系统,实时控制和监测每一次脉冲期间的工作状态以及电压、电流波形,控制周期精确至1 ms。采用数字增量式PID算法,达到对电压脉冲的精确控制,满足了脉冲发电机励磁周期投入和退出的间歇式工作模式及励磁波形调节的要求。     

双绕组感应发电机静止励磁调节器的锁相环研究

双绕组感应发电机具有随负载变化调节励磁磁场、保持负载电压恒定不变的优点,通过静止励磁调节器输出的有功电流控制母线电压、无功电流控制负载电压,两者经过坐标变换形成反馈电流,实现系统的闭环控制。锁相环(PLL)为坐标变换提供相位信息,选用合适的PLL可以提高坐标变换的动静态性能,为控制系统提供快速准确的反馈信息。分析了双绕组感应发电机励磁电压的特点,分析了双dq变换PLL、延时信号对消PLL、基于延时信号对消的滑动平均滤波PLL的各自工作特点,最后优选了基于延时信号对消的滑动平均PLL检测励磁电压相位。     

电压敏感电路的故障诊断技术研究

电压敏感电路能够敏感发电机的输出电压,是发电机调压电路的重要环节,其发生的故障将影响电源系统的安全与稳定。利用小波子频带能量检测技术对输出电压信号进行处理,从中获取故障信息,作为神经网络的输入。训练过程及测试结果表明：基于松散型小波神经网络应用在电压敏感电路故障诊断中,具有较高故障诊断率,验证了该方法的有效性。     

励磁系统仿真模型校正技术研究

励磁控制系统作为同步发电机的重要组成部分,主要作用是向同步发电机的定子绕组提供一个可控的直流电流(电压),维持机端电压恒定,满足同步发电机的正常发电需要。通过发电机组控制系统模型,及时校正机组仿真模型,对异常响应进行预警排查,能够有效提高系统运行的稳定性。在MATLAB中搭建了一种以外部仿真机作为励磁调节器的单机无穷大系统仿真模型,模拟励磁系统PID主环异常以及电力系统稳定器(PSS)辅环异常时的输出,与理论值进行对比分析,能够及时确定故障原因和部位,实现故障维修。     

飞机直流发电机电压控制器的设计与实验

笔者所设计的飞机直流发电机电压控制器中采用了SG3524芯片,试制了电路,进行了全电流范围内的试验,调节精度较高,可以取代原有的分立元件式晶体管电压调节器.     

航空变速恒频电源系统中优化的SPWM调压研究

 在航空变速恒频系统（VSCF）中，航空发电机发出的变频交流电经整流变换为直流电，再经逆变器变换成恒频交流电。逆变器通常采用固定开关点的优化的ＳＰＷＭ技术，通过调节发电机激磁调节输出电压。由于系统是高阶系统，为了降阶，提出改变开关点的位置来调节输出电压，并提出优化ＳＰＷＭ的定义，分析了调节范围和谐波含量的变化，并给出了实现电路。     

飞机直流发电机晶体管调压器设计

本文运用以发电机输出电压的变化来控制发电机激磁电压占空比的变化,籍以改变平均激磁电流,达到调整其输出电压之原理,以现设计的由电压敏感电路、单结晶体管三角波发生器、比较器以及功率放大器所组成的晶体管调压器为例,阐述了晶体管调压器的设计方法。文中主要介绍了调压系统数学模型的建立方法,根据对调压系统性能指标的要求,对系统进行综合校正,以及校正装置的设计等。系统实验表明,用此种方法设计的调压器可以获得比较满意的结果。     

基于集成电路的航空交流发电机电压调节器设计

介绍了一种基于集成电路的脉冲调宽式航空交流发电机电压调节器的设计方法,给出了具体的硬件电路。利用仿真手段验证了电路设计的正确性,结合三级式航空交流发电机进行了调试,调试结果表明,调压系统具有抗干扰能力强、调压精度高的特点。     

一种新型Halbach阵列永磁振动发电机的设计与输出特性分析

给出了一种永磁振动发电机感应电动势的计算公式,设计了一种新型Halbach阵列永磁振动发电机,机体两侧分别固定了两组永磁体,内部6个线圈串联。采用有限元法,与普通Halbach阵列和传统永磁振动发电机进行了对比分析,新型Halbach阵列的应用大幅度提升了振动发电机的性能。正弦规律振动的振源频率为10 Hz,振幅为3 mm时,新型振动发电机的最大输出功率为355.85 mW,开路电压有效值为6.402 9 V。最后,对线圈相对永磁体的位置进行了优化,最大输出功率达到了414.81 mW,进一步提升了16.57%,此时开路电压有效值为7.036 6 V。     

Modeling of brushless DC generating systems using diakoptics

The mathematical modeling of a brushless DC generator is described, as an illustration of the application of diakoptic techniques to the analysis of small-scale electrical power supply systems. Modeling of the generator and its output rectifier is accomplished using an established matrix technique that accounts for the continuously changing conduction pattern of the diode bridge network. The advantages of using diakoptics are discussed together with the main generator linked to its exciter and to the automatic voltage regulator and permanent magnet generator which are often included in a complete unit. A solution algorithm is presented for this overall arrangement and a comparison is made between theoretical and practical results for a typical 3-stage, 4000-rev/min, 10.3-kW, 28-V unit     

Unified Voltage and Pitch Angle Controller for Wind-Driven Induction Generator System

A unified voltage and pitch angle controller (UVPC) for a wind-driven induction generator system is presented to reach effective voltage control and to stabilize generator speed and system frequency. The proposed UVPC comprises a linear optimal controller (LOC), a supplementary voltage regulator (SVR), and a supplementary pitch angle controller (SPC). An ac voltage regulator and a dc voltage regulator are designed in the SVR to generate the desired voltage magnitude and phase angle for the voltage-sourced inverter (VSI). On the other hand, the SPC is designed based on fuzzy logic inference rules in order to generate the desired pitch angle command for the variable blade pitch such that the mechanical power can be controlled in a very efficient manner. When the system is operated in the islanding condition, an approach based on the concept of relative rotating speed has been developed for the measurement of system frequency deviation. Simulation and experimental results reveal that both bus voltage and mechanical power can be effectively controlled by the proposed UVPC for the wind energy conversion system (WECS) either connected with or disconnected from the power grid when there is sufficient wind energy.     

REALIZATION OF FUZZY-FILTER CONTROL ON A BRUSHLESS AC GENERATOR

AC generators have adopted transistor volt-age regulators widely traditionally.The researchon the digital voltage regulators has arousedstrong interest[1～ 3] .The digital voltage regula-tors have some advantages on the transistor reg-ulators[4 ] :　　 ( 1 ) They can realize advanced control algo-rithm;　　 ( 2 ) They have communication function;　　 ( 3) They have data record function.　　 Recently,the DSPs ( Digital Signal Proces-sors) have been widely applied in digital controlarea with…     

波音747—400发电机调压器功能分析

本文分析了波音747-400型飞机发电机调压器的基本功能和工作原理,并对一些电路进行了实验研究,给出了部分实验结果。     

High power factor AC/DC/AC converter with random PWM

A three-phase AC/DC/AC converter is presented with a power factor preregulator to improve the power quality in the input side and a pseudorandom noise generator to reduce the emitted acoustic noise and the mechanical vibration for an induction motor drive. The space vector modulation with hysteresis current control for a voltage source rectifier is adopted to simplify the hardware circuit. A control scheme is presented to drive the supply current following the reference current. The amplitude of reference current for the pulsewidth modulation (PWM) rectifier is derived from the DC bus voltage regulator and the estimated output power. Random switching frequency technique for a three-phase PWM inverter system to reduce the annoying tonal noise and resonant vibration from an induction motor is described. By randomly varying the instantaneous PWM switching frequency from one cycle to the next, the frequency distribution of harmonics is spread in a wide frequency range. The major advantage for using such a strategy is the nonrepetitive output spectral characteristic that results in reduction of torque pulsations in motor drive systems. The nearly unity power factor at the three-phase rectifier and the absence of acoustic noise concentrated at the specific tones which is usually present with conventional sinusoidal modulation are verified by the experimental tests     

负载电流反馈补偿法在双凸极无刷直流发电机数字调压器中的应用

分析了双凸极无刷直流发电系统突加、卸负载时的工作机理及滤波电容的影响,在此基础上提出了负载电流反馈补偿控制方法,以提高系统的动态性能。实验结果表明,在系统突加和突卸负载两种情况下,加入负载电流反馈补偿控制后,不仅电压恢复时间明显缩短,而且电压波动幅值也大大减小,系统的动态特性得到了明显的提高。该方法可推广应用到不同类型的直流发电机的数字调压控制中。     

双三相永磁同步发电机多目标优化设计

为实现双三相永磁同步发电机(PMSG)的低固有电压调整率、高发电效率和低成本的特性,研究了侧重于降低固有电压调整率的多目标优化设计方案。采用解析法建立单元电机磁链模型,以永磁体磁化方向长度、永磁体所跨弧长和单元电机相绕组匝数为设计变量,分析上述参数对固有电压调整率、发电效率等评价指标的影响,并提出了基于权重系数的多目标优化函数。分别用标准遗传算法(SGA)、差分进化算法(DE)和基于以上2种算法的混合遗传算法(HGA)优化设计参数并进行对比。试验结果表明,HGA优化效果与设计目标具有良好的一致性,与初始设计参数相比,优化后的电机输出能力以及稳压能力均有所改善。     

一种改进的虚拟永磁风力发电系统模拟平台

提出了一种包含风剪塔影效应的风力发电系统的改进型模拟方案。以背靠背三相变流器平台为基础,建立了考虑包含风剪塔影效应的虚拟永磁直驱风力发电系统的数学模型,进而搭建其控制系统;针对简化叶尖速比与转矩系数拟合的问题,提出了一种基于Kalman滤波的分段线性拟合的方法来简化拟合方程;利用MATLAB/Simulink仿真软件搭建虚拟风力发电系统模拟平台,对负载变化时的模拟平台输出以及有无风剪塔影效应时风力机的机械转矩变化进行仿真分析。仿真结果表明,该平台能够较好地模拟出风力机发电机组地运行特性。