CN105743092A - 一种车载双向充电机网侧电流谐波抑制方法 - Google Patents
一种车载双向充电机网侧电流谐波抑制方法 Download PDFInfo
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Abstract
一种车载双向充电机网侧电流谐波抑制方法,建立单极性与双极性正弦脉宽调制(SPWM)产生谐和波的解析表达式,根据该表达式建立对单相系统和三相相系统的谐波模型,制定整流器或塑变器的控制策略和设计网侧滤波器,对于网侧电流产生的过零点畸变,采用混合调制方法,将一个开关周期进行分段,在电流波形峰谷时段内采用单极性倍频调制,用逆变器控制可有效降低输出电压的总谐波含量,采用SPWM调制进行逆变器控制方案,通过升高开关频率来提高网侧谐波的频率,再利用低通滤器来滤除谐波。采用本发明的技术方案能有效对车载双向充电机网侧电流谐波进行抑制。该方法优于现有的网侧电流谐波抑制。
Description
技术领域:
本发明涉及车载双方向充电机,具体涉及车载双向充电机网侧电流谐波抑制领域。
背景技术:
近年来,随着电动汽车相关技术研发取得的成果,电动汽车在性能和经济性方面已经接近甚至优于传统燃油汽车,并逐渐开始在世界范围内推广应用。国际能源展望报告指出世界交通能源的利用到2035年预计将增加44%(与2008年比),因此减少车辆燃油消耗是当今研究的技术热点。电动汽车的类型主要有混合动力电动汽车(HybridElectricVehicles,HEVs),插电式混合动力汽车(Plug-inHybridElectricVehicles,PHEVs)和纯电动汽车(BatteryElectricVehicles,BEVs),其中,PHEVs和BEVs是当前发展的主体,本项目中将PHEVs和BEVs统一定义为PEVs电动汽车以电作为驱动能源,具有能源多样性和环保性等优点,发展电动汽车取代燃油汽车被视为缓解能源短缺和环境恶化问题的有效手段之一。
开发车载双向充电机具有极其重要的意义,研究车载双向充电机的电力电子电路及其关键控制策略。虽然电动汽车充电机拓扑及相关控制技术的研究比较成熟,符合电池特性的充电方案己较普遍,相应的V2G能量控制也可借鉴并网逆变技术,但仍然不能满足飞速发展的V2G应用和智能电网发展的需求。当前研究高效率、高功率密度和高可靠性的车载双向充电机己刻不容缓。
在电动汽车参与电网的调频服务或调峰服务时都需要充电机的AC-DC变换器对网侧电流进行控制,充电机AC-DC变换器在进行交直流变换的过程中不可避免地会引入谐波,而电网为了保证自身的电能质量和用电设备的正常安全运行,对于接入电网的设备的谐波含水量量有着严格限制,因此在设计充电机时网侧THD是一项重要设计指标。申请人研究了一种车载双向充电机网侧电流谐波抑制方法,它是电动汽车车载双向充电机的核心技术。
发明内容:
本发明的目的是提供了一种车载双向充电机网侧电流谐波抑制方法。
本发明采取的技术方案如下:
一种车载双向充电机网侧电流谐波抑制方法,其特征是:建立单极性与双极性正弦脉宽调制(SPWM)产生谐和波的解析表达式,根据该表达式建立对单相系统和三相相系统的谐波模型,制定整流器或塑变器的控制策略和设计网侧滤波器,对于网侧电流产生的过零点畸变,采用混合调制方法,将一个开关周期进行分段,在电流波形峰谷时段内采用单极性倍频调制,用逆变器控制可有效降低输出电压的总谐波含量,采用SPWM调制进行逆变器控制方案,通过升高开关频率来提高网侧谐波的频率,再利用低通滤器来滤除谐波。
进一步,通过面积等效原理研究知矩形脉冲和梯形脉冲生成SPWM波形的谐波含量特性,利用离散傅立叶级数(DFS)来分析两种SPWM调制产生谐波的特性,用SVPWM控制AC-DC变换器,减少死区时间调制的角度电流谐波。
进一步,为了减少充电机对电网的谐波污染,采用外加有源滤波器(APFC)、多脉波整流、PWM整流。
通过试验证明,采用本发明的技术方案能有效对车载双向充电机网侧电流谐波进行抑制。该方法优于现有的网侧电流谐波抑制。
具体实施方式:
本发明的具体实施方式:
实施例1:一种车载双向充电机网侧电流谐波抑制方法,其特征是:建立单极性与双极性正弦脉宽调制(SPWM)产生谐和波的解析表达式,根据该表达式建立对单相系统和三相相系统的谐波模型,制定整流器或塑变器的控制策略和设计网侧滤波器,对于网侧电流产生的过零点畸变,采用混合调制方法,将一个开关周期进行分段,在电流波形峰谷时段内采用单极性倍频调制,用逆变器控制可有效降低输出电压的总谐波含量,采用SPWM调制进行逆变器控制方案,通过升高开关频率来提高网侧谐波的频率,再利用低通滤器来滤除谐波,通过面积等效原理研究知矩形脉冲和梯形脉冲生成SPWM波形的谐波含量特性,利用离散傅立叶级数(DFS)来分析两种SPWM调制产生谐波的特性,用SVPWM控制AC-DC变换器,减少死区时间调制的角度电流谐波,为了减少充电机对电网的谐波污染,采用外加有源滤波器(APFC)、多脉波整流、PWM整流。
Claims (3)
1.一种车载双向充电机网侧电流谐波抑制方法,其特征是:建立单极性与双极性正弦脉宽调制(SPWM)产生谐和波的解析表达式,根据该表达式建立对单相系统和三相相系统的谐波模型,制定整流器或塑变器的控制策略和设计网侧滤波器,对于网侧电流产生的过零点畸变,采用混合调制方法,将一个开关周期进行分段,在电流波形峰谷时段内采用单极性倍频调制,用逆变器控制可有效降低输出电压的总谐波含量,采用SPWM调制进行逆变器控制方案,通过升高开关频率来提高网侧谐波的频率,再利用低通滤器来滤除谐波。
2.根据权利要求1所述车载双向充电机网侧电流谐波抑制方法,其特征是:通过面积等效原理研究知矩形脉冲和梯形脉冲生成SPWM波形的谐波含量特性,利用离散傅立叶级数(DFS)来分析两种SPWM调制产生谐波的特性,用SVPWM控制AC-DC变换器,减少死区时间调制的角度电流谐波。
3.根据权利要求1所述车载双向充电机网侧电流谐波抑制方法,其特征是:采用外加有源滤波器(APFC)、多脉波整流、PWM整流,减少充电机对电网的谐波污染。
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