Miao Zhu

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Verified

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• Doctor of Philosophy
• Professor at Shanghai Jiao Tong University

DC grid has been deemed as the enabling technology for future power system. Within the DC grid, multi–terminal DC node (MTDN) serves as the key component for voltage/power conversion and fault protection. Configurations of MTDN are explored in this paper. The similarity of MTDN with classical AC substation is first indentified, and three series of...

DC substation serves as a MIMO (multiple-input multiple-output) system in DC grid for voltage regulation and power dispatching. Based on the DC substation configurations investigated in part I, a two-layer hierarchical control strategy is proposed with simultaneous terminal voltage/current control aims. The primary layer is implemented on single-in...

The utilization of DC power flow controller in Multi-terminal HVDC (MTDC) can increase the control dimension of DC power flow, by which both the active power distribution capability and coordination control performance can be enhanced in MTDC. In this paper, a novel concept of “composite DC power flow controller (CDCPFC)” has been proposed, and the...

DC power flow controller (DCPFC), is regarded as an effective technology to improve the active power distribution capability in a complex dc grid. Among different types of DCPFCs, the interline dc power flow controller (IDCPFC) can realize multi-line power flow control functions in a complex dc grid. In this paper, a modular multi-line IDCPFC has b...

On the basis of the classical Z-source inverter, this paper presents a developed impedance-type power inverter that is termed the switched inductor (SL) Z-source inverter. To enlarge voltage adjustability, the proposed inverter employs a unique SL impedance network to couple the main circuit and the power source. Compared with the classical Z-sourc...

In this article, the concept of asymmetrical bidirectional converter (ABC) is proposed for PV-storage generation station. The asymmetrical power flow is introduced by the massive PV power generation during the daytime and relatively smaller load supply/energy storage requirement at the night. To meet the asymmetrical bidirectional power flow need,...

The multiport DC hub has been evaluated as a cost-effective solution for interconnecting several HVDC grids. To address the stability issues of the isolated multiport DC hub, in this article, a comprehensive stability assessment has been conducted under different working modes, especially after DC fault occurrence. The multiport DC hub engages to i...

In this article, the concept of monopolar fault reconfiguration is proposed for bipolar DC distribution system. For traditional HVDC grid, the healthy pole can maintain continuous power transmission during monopolar fault. Similarly, bipolar DC distribution system also has the potential for monopolar fault-tolerant operation. However, DC distributi...

Hybrid hydrogen–energy storage systems play a significant role in the operation of islands microgrid with high renewable energy penetration: maintaining balance between the power supply and load demand. However, improper operation leads to undesirable costs and increases risks to voltage stability. Here, multi-time-scale scheduling is developed to...

In this article, the concept of quasi-transformer (Quasi-T) mode control is proposed for DC-DC interlinking converter. In multi-voltage levels DC systems, the interlinking converter serves for voltage conversion and mutual power support. The traditional operating modes for converters can be classified into constant voltage, current, power or a mix...

In this paper, the dual-mode bipolar hybrid triple active bridge (HyTAB) converter is proposed for bipolar DC systems with a wide output voltage operation range and bidirectional power transfer capability. The converter operates in the quasi-parallel mode at lower output voltages and switches to the series mode at higher output voltages. Moreover,...

The DR-based offshore platform has been accepted as a preferable solution for wind power collection from large-scale offshore wind farms (WF) and exporting to the high-voltage direct-current (HVDC) transmission system. In this paper, for the promising implementation in the all-DC offshore wind power transmission system (OWPTS) in future, a novel de...

In this article, the effect of parasitic resistance on multimode operation of four-switch Buck Boost converter is first revealed. To meet the wide voltage range of distributed energy resource, the converter operates as a versatile circuit with Buck, Transition and Boost modes. At the boundary between Buck and Transition mode, the parasitic resistan...

In this article, to mitigate the double-line frequency power ripple at dc-link caused by unbalanced grid voltage conditions, a developed virtual phase-current regulation (VPCR) method has been proposed for three-phase grid-tied inverters. The proposed method is featured with an optimized virtual phase current gain in the current feedback of the fau...

With the fast expansion of inverter-based renewable energy integration, the novel grid synchronization technology, power synchronization control (PSC), has attracted much attention. However, the synchronization characteristics of PSC, e.g., the perturbation suppression ability, synchronization speed, and its relationship with control parameters hav...

Increasing global environmental concerns encourage a continuous reduction in carbon emissions from the shipping industry. It has become an irreversible trend to replace traditional fossil fuels with advanced energy storage technology. However, an improper energy management leads to not only energy waste but also undesired costs and emissions. Accor...

This letter proposes a feedback-based setpoint mechanism in model predictive control (MPC) to improve frequency dynamics of load frequency control. Unlike standard tracking MPC with fixed setpoints, an extra closed-loop is introduced in the MPC strategy to self-adjust the setpoints to enhance frequency restoration performances. Moreover, the propos...

In a bipolar DC distribution system, a monopolar fault can result in a power outage for the load connected to the faulted pole. To provide a resilient load supply, a bipolar semi-active bridge (BiSAB) converter is proposed in this paper as an interface converter. With the proposed BiSAB converter, the monopolar short-circuit fault can be blocked fr...

Owing to extensive seaport electrification and growing concerns about maritime carbon emissions, efficient coordination of logistics services and energy services among the seaport authorities and the shipowners has become crucial to maximize potential operational flexibility and to improve energy efficiency. However, existing studies rely on centra...

Unbalanced grid conditions caused by asymmetrical faults or voltage distortions extremely deteriorate the grid reliability, resulting in power fluctuation of three-phase grid-tied inverters at dc link. A virtual phase-current regulation (VPCR) method is introduced in previous research to solve the power quality problem depending on controller feedb...

With the rapid development of global offshore wind power, the scale and capacity of offshore wind farms (OWF) are continuously expanding, making it crucial to enhance the overall economic efficiency of OWFs. However, previous studies on DC collector systems of OWFs mainly focus on the DC series-parallel (SP) topology, which escalates the overall co...

This article proposes a multiport wireless power router (MWPR) and its control strategy which is capable of processing multiway bidirectional power flow and can be potentially applied in multiport power processing applications, such as battery management and interfacing systems. The MWPR connects multiple sources and loads through vertically stacke...

Marine power systems are isolated from external grids, making them more vulnerable than land-based power systems. When ships are sailing on the ocean, complicated maritime environment and electrical component failure pose a crucial challenge to a safe and resilient shipboard power system. Different from fixed terrestrial microgrids, all-electric sh...

The triple active-bridge (TAB) DC-DC converter, as a representative multiport converter, is widely used in DC distribution system. The open-circuit fault (OCF) of TAB seriously threatens the system safety operation. In this article, an OCF diagnosis and tolerant method is proposed for TAB converter to reduce the impact of OCF. The fault mode of TAB...

DC short‐circuit fault has become one of the major concerns in bipolar DC system operation under complicated conditions. Compared with conventional two‐port DC‐DC converter, fault‐tolerant DC‐DC converter with multiple external ports is evaluated as a preferential choice for high reliability, availability and flexibility required bipolar DC system...

The increasing penetration of volatile renewable energy poses a significant challenge for islanded microgrids in maintaining the seasonal power balance on a long-term timescale. To support renewable integration, seasonal energy storage techniques are expected to coordinate with short-term storage systems to compensate for power mismatches on multip...

As a nonlinear control method, the Euler–Lagrange- (EL-) based passivity-based control (PBC) has been studied for grid-tied converters based on energy function to achieve better performance. However, the EL-based PBC method is dependent on an accurate mathematical model. In the traditional EL-based PBC research for LCL-filtered grid-tied inverter,...

Owing to the global concern for serious energy crises and increased greenhouse gas emissions, the wind energy capacity has grown rapidly in recent years. However, due to weather variations, dramatic power fluctuations exacerbate the uncertainty of wind power generation. To enhance stability and maximize utilization, the precise prediction of wind p...

The power flow control capability of HVDC power grid can be improved by integrating a DC power flow controller into the grid. In this paper, an expandable interline DC power flow controller (IDCPFC) is proposed. Compared with the existing DC power flow controller, the proposed IDCPFC has the advantages of high expandability, less active switching d...

All-electric ship fleets, which are distinct from landbased microgrid clusters, operate as maritime mobile microgrid clusters, navigating among multiple ports to satisfy various spatial-temporally logistics service demands of each port. In this context, unlike a traditional ship fleet dispatching problem which only focuses on logistics, a joint opt...

Low frequency AC transmission system (LFAC) is a potential solution for deep-sea offshore wind power utilization besides HVAC and HVDC. Multi-port converter is the key device for the interconnection of hybrid frequency wind farms and power grid. An improved multi-port modular multilevel converter with dual AC ports and single DC port (DASD-MMC) is...

DC power flow controller is a research hotspot to increase control freedom degrees of power flow and improve rationality of power flow distribution in meshed HVDC grid. Based on previous analysis and research on C-based full-bridge interline DC power flow controller, a modular n-line C-based full-bridge interline DC power flow controller is propose...

Non-inverting Buck Boost converter (NIBB) operates with both voltage-step and step-down capability due to the combination of buck, boost and transition working modes. In endogenous multimode operation of NIBB, the real-time working mode selection requires high performance control strategy applicable for the multiple working modes. In this paper, wi...

This article proposed the concept of monopolar fault reconfiguration for bipolar dc distribution system realized with Bipolar Half Bridge (BiHB) converter. Monopolar fault reconfiguration oriented from bipolar high voltage direct current (HVdc) transmission grid. For dc distribution, the operation aim is to provide uninterrupted power supply to cri...

Based on the nature of wind, wind power fluctuations can cause significant problems in the distribution network. One of the solutions is to integrate an energy storage system with wind farm to mitigate the output power fluctuations. Therefore, an energy storage coordinated control strategy based on model predictive control is proposed to smooth min...