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

Abstract

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.

Intelligent control algorithm for dynamic positioning control system

“…Lin et al designed a flexible energy scheduling algorithm to solve the problem of high inter continuity in pulse loads of integrated power system ships in a short period of time. The test results have verified the effectiveness of the algorithm (Lin et al, 2021). The application of the above ICAs in power system ships can effectively reduce energy consumption, while the proposed ICA can simultaneously balance economy, accuracy, and safety.…”

Virtual inertia control of distribution grids under automobile charging and discharging load uncertainty

“…Therefore, virtual inertia control of the power grid can reflect the current power grid's stability ability to the system under uncertain load conditions. The formula for the inertia constant of AC power in the automotive distribution network is shown in equation (1). 2), it can be seen that the inertia of the entire DC power grid is relatively small when the capacitance and rated voltage are small.…”

“…At the same time, with the popularization of electric vehicles and the gradual increase of renewable energy, the power system is also facing increasingly complex challenges. One of the main issues is the uncertainty caused by electric vehicles' charging and discharging process on the distribution network [1]. In traditional power systems, the inertia of the distribution network mainly relies on the electromechanical inertia provided by synchronous generators.…”

Dynamic power management for all‐electric ships based on data‐driven propulsion power modelling

“…Instead of the physically connected structure by a main shaft between the engines and propellers in traditional ships, AESs adopt a physically isolated structure between power sources and the load demand by an integrated power system [5,6] to fully supply various types of onboard load demand, such as propulsion, radar, navigation systems, and auxiliary services, which greatly improve the system efficiency and reduce the redundancy of the onboard components [7] and thus can be viewed as an isolated mobile microgrid.…”