Analysis of Integrated Power System With Pulse Load by Periodic Orbit

The pulse load of an integrated power system (IPS) ship can produce very high power intermittently in a short period of time. Owing to the limited DC bus capacitance, the periodic pulse load charging and discharging process can make the IPS system state variables have a periodic alternating process during electromagnetic transients, especially at the bus voltage. In order to alleviate this problem, it is necessary to find a suitable control strategy. At first, this article establishes a mathematical model of DC bus voltage dynamics and propulsion motor load. Then, a flexible energy scheduling algorithm is proposed to coordinate the propulsion motor load and the pulse load based on the flexibility of IPS energy scheduling and the concept of virtual inertia. This algorithm can adaptively change the virtual inertia of the DC bus according to the pulse load power level and the propulsion motor load level to mitigate the impact of the pulse load on the IPS system. At the same time, the algorithm is also distributed and has little impact on the propulsion system. Finally, the effectiveness of the algorithm is verified through the mixed simulation of PSCAD and MATLAB and the hardware in the loop test.

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“…Among them, the simulation step is controlled by PSCAD and set to 20 us. The main simulation parameters are shown in Table 1 according to [20].…”

Section: Resultsmentioning

confidence: 99%

A flexible virtual inertial control algorithm for ship with propulsion load and pulse load

Lin

Xiao

2021

IET Electric Power Appl

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“…In [5], [21], the rectification of the generator is equivalent to that of the voltage source, which shows a process of conduction and commutation. The model is obtained after statespace averaging.…”

Section: B Mathematical Model Of Mipsmentioning

confidence: 99%

“…The pulse load is a periodic high-power load released in a short time. Its pulse interval is a couple of seconds and its released power ranges from several hundred kilowatts to several megawatts, as is the case for radar, beam weapon and electromagnetic rail launcher [5]. Only the integrated power system can support the pulse load on board.…”

Section: Introductionmentioning

confidence: 99%

“…Dynamic state estimation is used instead of the static state estimation because it can better estimate the dynamic characteristics of the system state, and will play an important role in the control and protection of power systems. Compared with the dynamic state of the traditional land power systems which tends to be stable after disturbance, the dynamic disturbance will greatly affect the estimated effect of the filter when the MIPS operates with its pulse load changing periodically [5], [15]. A periodic change in the pulse load of the MIPS may cause trouble for the linearized algorithm of the system model, and the adaptability of the EKF to the MIPS needs to be studied.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic State Estimation of Medium-voltage DC Integrated Power System with Pulse Load

Xiao

Wang

Hao

et al. 2020

Journal of Modern Power Systems and Clean Energy

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The dynamic characteristic evaluation is an important prerequisite for safe and reliable operation of the mediumvoltage DC integrated power system (MIPS), and the dynamic state estimation is an essential technical approach to the evaluation. Unlike the electromechanical transient process in a traditional power system, periodic change in pulse load of the MIPS is an electromagnetic transient process. As the system state suddenly changes in the range of a smaller time constant, it is difficult to estimate the dynamic state due to periodic disturbance. This paper presents a dynamic mathematical model of the MIPS according to the network structure and control strategy, thereby overcoming the restrictions of algebraic variables on the estimation and developing a dynamic state estimation method based on the extended Kalman filter. Using the method of adding fictitious process noise, it is possible to solve the problem that the linearized algorithm of the MIPS model is less reliable when an abrupt change occurs in the pulse load. Therefore, the accuracy of the dynamic state estimation and the stability of the filter can be improved under the periodic disturbance of pulse load. The simulation and experimental results confirm that the proposed model and method are feasible and effective.

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Stability analysis of integrated power system with pulse load

Wang

Xiao

et al. 2020

International Journal of Electrical Power & Energy Systems

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Analysis of Integrated Power System With Pulse Load by Periodic Orbit

Cited by 7 publications

References 9 publications

A flexible virtual inertial control algorithm for ship with propulsion load and pulse load

A flexible virtual inertial control algorithm for ship with propulsion load and pulse load

Dynamic State Estimation of Medium-voltage DC Integrated Power System with Pulse Load

Stability analysis of integrated power system with pulse load

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