Detailed Excitation Control Methods for Two-Phase Brushless Exciter of the Wound-Rotor Synchronous Starter/Generator in the Starting Mode

Self Cite

Wound-rotor synchronous starter-generator (WRSSG) has the advantages of less volume and weight, high safety and low cost in maintenance, so it is becoming increasingly popular in modern aircraft, especially for more-electric aircraft. The main machine (MM) and main exciter (ME) of the aircraft WRSSG are electromechanically coupled seriously, which makes the start control for the WRSSG complex in the starting mode. In this study, a decoupling start control method for aircraft WRSSG based on main field current estimation is proposed to solve the serious coupling problem and improve start control performance. In the proposed decoupling control method, the main field current is estimated first and used in the closed-loop excitation control for the ME to make the main field current meet the MM demand. With the desired field current, the MM is decoupled with the ME and controlled like a traditional synchronous motor to start the aircraft engine under maximum torque per ampere. The feasibility and effectiveness of the proposed decoupling control method is verified by experimental results.

Section: Estimation Of Main Field Currentmentioning

confidence: 99%

“…The typical structure of the wound-rotor synchronous startergenerator (WRSSG) with a two-phase brushless exciter is shown in Fig. 1 [7,8]. The WRSSG includes three electrical machines in the same shaft: the main machine (MM), the main exciter (ME) and the pre-exciter (PE).…”

Section: Introductionmentioning

confidence: 99%

Decoupling start control method for aircraft wound‐rotor synchronous starter‐generator based on main field current estimation

Jiao

Liu

Meng

et al. 2018

Self Cite

“…833-842 © The Institution of Engineering and Technology 2018 magnetic field will be generated and three-phase electromotive force will be induced in the armature winding of ME. This threephase electromotive force forms a DC field current for MM through the rotating diode rectifier [8][9][10]. After MM's field current builds up, WSSG is controlled to start aero-engine.…”

Section: Machine Modellingmentioning

confidence: 99%

Rotor position estimation method of wound‐rotor synchronous starter/generator

Zhu

Liu

Peng

et al. 2018

Self Cite

This study proposes a novel rotor position estimation method for wound-rotor synchronous starter/generator (WSSG). At the starting stage, WSSG needs a resolver to obtain the main machine's (MM's) rotor position. However, the use of resolver increases starting system's complexity, volume, weight and cost. In order to solve this problem, a novel kind of MM's rotor position estimation method is proposed, which considers the structure of WSSG as a resolver. The novel method injects a rotating voltage into MM's stator, detects main exciter's stator current and subsequently processes the current signals to estimate MM's rotor position. Experimental results show that the novel method can estimate rotor position accurately, which are in good agreement with the theoretical analyses and simulation results. Compared to the saliency tracking rotor position estimation method, the novel method does not rely on WSSG's parameters (including MM's saliency), and the signal processing procedures are more simple.

“…However, the field current could not be directly controlled and parameter errors were not considered. For the starting of an aircraft generator, two-phase and three-phase main exciter controller was proposed in [13][14][15]. During starting, the main generator acts as a motor and the twophase main exciter controller maintains the ac field current of the exciter using space vector modulation.…”

Section: Introductionmentioning

confidence: 99%

Design and direct field current control scheme of a synchronous generator with PM exciter based on the reference frequency

Lee

2019

This study presents the design and control scheme of a self-excited 10 kW-380 V synchronous generator using a permanent magnet (PM) exciter. The PM exciter generates field current according to the engine speed to maintain the output voltage of the proposed generator so that constant voltage can be produced regardless of the speed. For the direct control the field winding current, a current controller is designed and embedded on the shaft. In the proposed generator, the reference current is determined by an external voltage controller and it is transferred to the rotating embedded current controller using an infrared (IR) transmitter and receiver aligned to the shaft. In order to improve control performance, the reference field current is controlled by the actual frequency of the generator based on the reference frequency. Therefore, when the engine speed is fluctuating due to engine governor dynamics, the frequency-based field current can maintain the output voltage constant because of the compensation term for speed variations. In the compared experimental results between the conventional generator with winding type exciter and the proposed generator system, both dynamic performance and operating efficiency of the proposed system are improved.