Study of Harmonic Suppression of Ship Electric Propulsion Systems

Yifei Wang,Youxin Yuan,Jing Chen 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5

This paper studies the harmonic characteristics of ship electric propulsion systems and their treatment methods. It also adopts effective measures to suppress and prevent ship power systems from affecting ship operation due to the serious damage caused by harmonics. Firstly, the harmonic characteristics of a ship electric propulsion system are reviewed and discussed. Secondly, aiming at problems such as resonant frequency and filter characteristics variations, resonance point migration, and unstable filtering performances in conventional passive filters, a method for fully tuning of a passive dynamic tunable filter (PDTF) is proposed to realize harmonic suppression. Thirdly, to address the problems of the uncontrollable inductance L of traditional air gap iron core reactors and the harmonics of power electronic impedance converters (PEICs), this paper proposes an electromagnetic coupling reactor with impedance transformation and harmonic suppression characteristics (ECRITHS), with the internal filter (IF) designed to suppress the harmonics generated by PEICs. The ECRITHS is characterized by both harmonic suppression and impedance change. Fourthly, the ECRITHS is investigated. This investigation includes the harmonic suppression characteristics and impedance transformation characteristics of the ECRITHS at the fundamental frequency, which shows the good performance of the ECRITHS. Simulation and experimental evaluations of the PDTF are carried out. Multiple PDTFs can be configured to realize multi-order simultaneous dynamic filtering, and can effectively eliminate the current harmonics of ship electric propulsion systems. This is done to reduce the total harmonic distortion (THD) of the supply currents to well below the 5% limit imposed by the IEEE-519 standard. The PDTF also can eliminate harmonic currents in different geographic places by using a low voltage distribution system. Finally, a detailed discussion is presented, with challenges and future implications discussed. The research results are intended to effectively eliminate the harmonics of ship electric power propulsion systems and to improve the power quality of ship power systems. This is of theoretical and practical significance for improving the power quality and power savings of ship power systems.

Study of Harmonic Suppression of Ship Electric Propulsion Systems

Wang, Yifei,Yuan, Youxin,Chen, Jing The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5

This paper studies the harmonic characteristics of ship electric propulsion systems and their treatment methods. It also adopts effective measures to suppress and prevent ship power systems from affecting ship operation due to the serious damage caused by harmonics. Firstly, the harmonic characteristics of a ship electric propulsion system are reviewed and discussed. Secondly, aiming at problems such as resonant frequency and filter characteristics variations, resonance point migration, and unstable filtering performances in conventional passive filters, a method for fully tuning of a passive dynamic tunable filter (PDTF) is proposed to realize harmonic suppression. Thirdly, to address the problems of the uncontrollable inductance L of traditional air gap iron core reactors and the harmonics of power electronic impedance converters (PEICs), this paper proposes an electromagnetic coupling reactor with impedance transformation and harmonic suppression characteristics (ECRITHS), with the internal filter (IF) designed to suppress the harmonics generated by PEICs. The ECRITHS is characterized by both harmonic suppression and impedance change. Fourthly, the ECRITHS is investigated. This investigation includes the harmonic suppression characteristics and impedance transformation characteristics of the ECRITHS at the fundamental frequency, which shows the good performance of the ECRITHS. Simulation and experimental evaluations of the PDTF are carried out. Multiple PDTFs can be configured to realize multi-order simultaneous dynamic filtering, and can effectively eliminate the current harmonics of ship electric propulsion systems. This is done to reduce the total harmonic distortion (THD) of the supply currents to well below the 5% limit imposed by the IEEE-519 standard. The PDTF also can eliminate harmonic currents in different geographic places by using a low voltage distribution system. Finally, a detailed discussion is presented, with challenges and future implications discussed. The research results are intended to effectively eliminate the harmonics of ship electric power propulsion systems and to improve the power quality of ship power systems. This is of theoretical and practical significance for improving the power quality and power savings of ship power systems.

Research on grid‑connected harmonic current suppression of three‑phase four‑wire energy storage inverters

Hongyang Qing,Chunjiang Zhang,Xiuhui Chai,Hao He,Xiaohuan Wang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.6

When a three-phase four-wire grid-connected energy storage inverter is connected to unbalanced or single-phase loads, a large grid-connected harmonic current is generated due to the existence of a zero-sequence channel. A controller design approach for grid-connected harmonic current suppression is proposed based on proportion–integral–repetitive (PI–repetitive) control for a three-level neutral point clamped (3L-NPC) three-phase four-wire inverter. By designing the variable parameters n (gain coeffi cient of the PI controller) and Qs (gain of the repetitive controller), the eff ect of the PI–repetitive controller gain on current harmonic suppression is analyzed using a three-dimensional amplitude gain curve. A simplifi ed impedance model in the d 0-frame for a three-phase four-wire inverter is proposed. Based on the impedance model in the d0-frame, the system stability is analyzed under diff erent PI–repetitive control gains by the generalized Nyquist criterion. Finally, the optimal controller design is obtained by a gain characteristic and system stability analysis. The controller obtained by this harmonic suppression analysis method can simultaneously ensure the best grid-connected current quality of the three-phase four-wireinverter and the dynamic stability of the system. Simulation and experimental results verify the effectiveness and correctness of the proposed controller design approach for grid-connected harmonic current suppression.

2차 고조파 기반 표적 탐지 레이다용 S-대역 GaN HEMT 전력 증폭기

문단아,김지수,이다주,오준택 한국전자파학회 2024 한국전자파학회논문지 Vol.35 No.7

본 논문은 2차 고조파 기반 표적 탐지 레이다용 2.9∼3.2 GHz 범위의 S-대역 전력 증폭기의 설계 및 제작 결과를 제시한다. 90도 개방 스터브를 활용하여 높은 고조파 억제 특성을 달성할 뿐만 아니라, 입력 및 출력 정합단의 추가적인 삽입손실이 없도록 정합단을 효과적으로 구현함으로써 높은 효율을 가지는 전력 증폭기 구성이 가능하다. 제작된 전력 증폭기의 단일 측정 결과, 2.9∼3.2 GHz 범위에서 40 dBm 이상의 최대 포화 전력, 11.6∼13.3 dB의 전력 이득, 60.3∼73.7 %의드레인 효율, 58.6 dBc 이상의 2차 고조파 억제 레벨을 확인하였다. 구동 증폭기로 구현된 송신 시스템의 전력 증폭기측정 결과, 3.0∼3.2 GHz 범위에서 60 dBc 이상의 고조파 억제 레벨을 달성하여 2차 고조파 기반 표적 탐지 레이다용전력 증폭기에 대한 적합성을 검증하였다. This paper presents an S-band power amplifier (PA) operating in the 2.9∼3.2 GHz range for 2nd harmonic-based target detection radar. The input and output matching networks utilize transmission lines and λ/4 open stubs at 2nd harmonic frequencies to effectively match the load impedance to the optimal power matching contours at fundamental frequencies while achieving high 2nd harmonic sup- pression characteristics. This design achieves these goals without simultaneously introducing additional insertion losses at the input and output. Single measurements of the fabricated PA demonstrate a maximum saturated power exceeding 40 dBm, power gain ranging from 11.6 to 13.3 dB, and 2nd harmonic suppression level of 58.6 dBc or better across the 2.9∼3.2 GHz range. When employed as a driver amplifier in the transmitter system, the PA exhibits a 2nd harmonic suppression level of 60 dBc or better within the 3.0∼3.2 GHz range, affirming its suitability for 2 nd harmonic-based target detection radar applications.

Size and Harmonic Reduced Wilkinson Baiun Using Parallel Coupled Line with Open Stub

Won-Kyun Lee,Hee-Yong Hwang 한국전자파학회JEES 2014 Journal of Electromagnetic Engineering and Science Vol.14 No.4

In this paper, a size-reduced Wilkinson balun with wide harmonic-suppressed band is presented. An accurate analysis of the parallel coupled line with an open stub (PCL-OS) is carried out. The PCL-OS structure shows excellent low pass filter and harmonic- suppression characteristics, which is useful for designing a low pass filter unit cell (LUC) with a reduced size. The designed Wilkinson balun at a 2.45 GHz center frequency not only shows an excellent harmonic suppression including the 5th harmonics up to 14 GHz over 15 dB, but it also has an area reduced to 48% of the conventional one.

무선전력전송 및 에너지 하베스팅을 위한 고조파 억제 기반의 고효율 및 소형화 정류기 설계

최유진,기아 탕 부이,남형석,서철헌 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.12

This paper proposes the design of a compact and highly efficient 2.45 GHz rectifier based on harmonic suppression. The proposed rectifier enhanced the RF–DC efficiency by suppressing the second and third harmonics. Additionally, a second harmonic suppression network was used for matching, thereby eliminating the need for an additional input impedance matching network and resulting in a smaller size. The fabricated rectifier demonstrated a very high power conversion efficiency (PCE) of 81.22 % at an input power of 12.5 dBm, with dimensions of 19 mm×15.5 mm.

Novel Method for Circulating Current Suppression in MMCs Based on Multiple Quasi-PR Controller

Qiu, Jian,Hang, Lijun,Liu, Dongliang,Geng, Shengbao,Ma, Xiaonan,Li, Zhen The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.6

An improved circulating current suppression control method is proposed in this paper. In the proposed controller, an outer loop of the average capacitor voltage control model is used to balance the sub-module capacitor voltage. Meanwhile, an individual voltage balance controller and an arm voltage balance controller are also used. The DC and harmonic components of the circulating current are separated using a low pass filter. Therefore, a multiple quasi-proportional-resonant (multi-quasi-PR) controller is introduced in the inner loop to eliminate the circulating harmonic current, which mainly contains second-order harmonic but also contains other high-order harmonics. In addition, the parameters of the multi-quasi-PR controller are designed in the discrete domain and an analysis of the stability characteristic is given in this paper. In addition, a simulation model of a three-phase MMC system is built in order to confirm the correctness and superiority of the proposed controller. Finally, experiment results are presented and compared. These results illustrate that the improved control method has good performance in suppressing circulating harmonic current and in balancing the capacitor voltage.

Novel Method for Circulating Current Suppression in MMCs Based on Multiple Quasi-PR Controller

Jian Qiu,Lijun Hang,Dongliang Liu,Shengbao Geng,Xiaonan Ma,Zhen Li 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.6

An improved circulating current suppression control method is proposed in this paper. In the proposed controller, an outer loop of the average capacitor voltage control model is used to balance the sub-module capacitor voltage. Meanwhile, an individual voltage balance controller and an arm voltage balance controller are also used. The DC and harmonic components of the circulating current are separated using a low pass filter. Therefore, a multiple quasi-proportional-resonant (multi-quasi-PR) controller is introduced in the inner loop to eliminate the circulating harmonic current, which mainly contains second-order harmonic but also contains other high-order harmonics. In addition, the parameters of the multi-quasi-PR controller are designed in the discrete domain and an analysis of the stability characteristic is given in this paper. In addition, a simulation model of a three-phase MMC system is built in order to confirm the correctness and superiority of the proposed controller. Finally, experiment results are presented and compared. These results illustrate that the improved control method has good performance in suppressing circulating harmonic current and in balancing the capacitor voltage.

위상 지연 선로를 이용한 새로운 구조의 주파수 2체배기

조승용,이경학,김용환,도지훈,이형규,홍의석,Cho, Seung-Yong,Lee, Kyoung-Hak,Kim, Yong-Hwan,Do, Ji-Hoon,Lee, Hyung-Kyu,Hong, Ui-Seok 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.2A

본 논문에서는 입력단에 위상 지연 선로와 하모닉 출력단에 $90^{\circ}$ 하이브리드 결합기를 사용하여 억압특성을 개선한 새로운 구조의 주파수 체배기를 설계 및 제작하였다. 제안된 구조의 주파수 체배기는 출력전력 결합특성과 기본주파수의 억압특성을 개선하였다. $2.13{\sim}2.15GHz$의 주파수를 2체배 하여 $4.26{\sim}4.30GHz$의 신호원을 얻는 능동주파수 2체배기이며, 입력전력이 10dBm일 때 0.79dB 변환이득과 기본주파수에서 -55.54dBc, 3체배 주파수 6.42GHz에서 -44.76dBc, 4체배 주파수 8.56GHz에서 -39.19dBc의 개선된 억압특성값 얻을 수 있었다. In this paper, A novel structure of frequency doubler using Phase Delay line and $90^{\circ}$ Hybrid coupler at harmonic output have been designed and implemented to improve suppression. Proposed structure of frequency doubler improve output. coupling and fundamental suppression. Active frequency doubler with band from $2.13{\sim}2.15GHz\;to\;4.26{\sim}4.3GHz$ was designed and fabricated with 10dBm input power, 0.79dB conversion gain and -55.54dBc suppression at fundamental frequency, -44.76dBc suppression at third harmonic frequency 6.42GHz and -39.18dBc suppression at fourth harmonic frequency 8.56GHz.

A Hybrid Static Compensator for Dynamic Reactive Power Compensation and Harmonic Suppression

Jia-Qiang Yang,Lei Yang,Zi-peng Su 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.3

This paper presents a combined system of a small-capacity inverter and multigroup delta-connected thyristor switched capacitors (TSCs). The system is referred to as a hybrid static compensator (HSC) and has the functions of dynamic reactive power compensation and harmonic suppression. In the proposed topology, the load reactive power is mainly compensated by the TSCs. Meanwhile the inverter is meant to cooperate with TSCs to achieve continuous reactive power compensation, and to filter the harmonics generated by nonlinear loads and the TSCs. First, the structure and mathematical model of the HSC are discussed Then the control method of the HSC is presented. An improved reduced order generalized integrator (ROGI)-based selective current control method is adopted in the inverter to achieve high-performance reactive and harmonic current compensation. Meanwhile, a switch control strategy is proposed to implement precise and fast switching of the TSCs and to avoid changing the time delay needed by the conventional switch strategy. Experiments are implemented on a 20 KVA HSC prototype and the obtained results verify the validity of the proposed HSC system.