Design and Control of Power Fluctuation Delivery for Cell Capacitance Optimization in Multiport Modular Solid-State Transformers

Zhou, Jianqiao; Zhang, Jianwen; Wang, Jiacheng; Zang, Jiajie; Shi, Gang; Feng, Xin; Cai, Xu

doi:10.1109/tpel.2020.3006956

Cited by 51 publications

(10 citation statements)

References 14 publications

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“…MV AC at the primary side and MV DC, LV DC, and LV AC at the secondary side (three outputs) [117] Multi-stage based on modular multilevel converters (primary side), isolation based on DC-DC DAB, and full-bridge DC-AC (secondary side)…”

Section: Referencesmentioning

confidence: 99%

Review of a Disruptive Vision of Future Power Grids: A New Path Based on Hybrid AC/DC Grids and Solid-State Transformers

et al. 2021

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Power grids are evolving with the aim to guarantee sustainability and higher levels of power quality for universal access to electricity. More specifically, over the last two decades, power grids have been targeted for significant changes, including migration from centralized to decentralized paradigms as a corollary of intensive integration of novel electrical technologies and the availability of derived equipment. This paper addresses a review of a disruptive vision of future power grids, mainly focusing on the use of hybrid AC/DC grids and solid‑state transformers technologies. Regarding hybrid AC/DC grids in particular, they are analyzed in detail in the context of unipolar and bipolar DC grids (i.e., two‑wire or three‑wire DC grids), as well as the different structures concerning coupled and decoupled AC configurations with low‑frequency or high‑frequency isolation. The contextualization of the possible configurations of solid‑state transformers and the different configurations of hybrid transformers (in the perspective of offering benefits for increasing power quality in terms of currents or voltages) is also analyzed within the perspective of the smart transformers. Additionally, the paper also presents unified multi‑port systems used to interface various technologies with hybrid AC/DC grids, which are also foreseen to play an important role in future power grids (e.g., the unified interface of renewable energy sources and energy storage systems), including an analysis concerning unified multi‑port systems for AC or DC grids. Throughout the paper, these topics are presented and discussed in the context of future power grids. An exhaustive description of these technologies is made, covering the most relevant and recent structures and features that can be developed, as well as the challenges for the future power grids. Several scenarios are presented, encompassing the mentioned technologies, and unveiling a progressive evolution that culminates in the cooperative scope of such technologies for a disruptive vision of future power grids.

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Section: Referencesmentioning

confidence: 99%

Review of a Disruptive Vision of Future Power Grids: A New Path Based on Hybrid AC/DC Grids and Solid-State Transformers

et al. 2021

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“…The CHB-based SSTs because of the control flexibility, modular capability, and a classical form of configuration are a reasonable option, and the three-stage SSTs have many capabilities to improve the power quality of the grids. This type of SSTs is composed of an MV AC/DC stage, an isolation DC/DC stage, and an LV DC/AC stage, that enables input/output current control-ability, guarantees four-quadrant power flow, and as a result, provides the system control more degrees of freedom [24][25][26]. Therefore, many researchers have been focused on different structures of the three-stage SSTs.…”

Section: Three-stage Chb-based Sstsmentioning

confidence: 99%

Flexible control for power‐sharing in the CHB‐based SST under voltage unbalance conditions

Babaei

Ghandehari

2021

IET Power Electronics

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Solid-state transformers (SSTs) have flexible capabilities to improve the power quality issues. These improvements impose disturbances into the SST converters that require proper control algorithms. In this paper, the problems of the unequal active power flow in different phases of the SST due to the grid voltage unbalance conditions and the negative sequence current injection are discussed, and an effective method is proposed to equally sharing the active powers between the SST clusters by creating an optimum zero sequence current. Based on the power dependencies, an analytical vector for the zero-sequence current is proposed, which can equally share the power among the SST clusters and balance the HVDC-link voltages. Also, the proposed control strategy by using PIR controllers can achieve the zero-sequence current based on a direct current control method. The provided equal power-sharing among the clusters is kept in the considerable unbalanced voltage of the grid and prevents the SST outage during faults. The simulation and experimental results confirm the proposed control method to equalise the power-sharing among the SST clusters and voltage equalisation of the HVDC-links while the SST tries to improve the grid voltage unbalance and in the fault conditions of the grid.

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“…Unlike classical two-port power interfaces, the MMC-based three-port SSTs can connect the LVDC system to both the MVAC and MVDC systems. Most of the MMC-based SSTs require large quantity of submodule capacitors, which brings high cost and control difficulty (Ma et al, 2020;Ma et al, 2021;Zhou et al, 2021). A novel kind of MMC-based SSTs, isolated MMC (I-M 2 C), decreases the capacitor number to one by sharing a single capacitor among all the submodules (Liu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

LVDC Bipolar Balance Control of I-M2C in Urban AC/DC Hybrid Distribution System

Sun

Liu

et al. 2022

Front. Energy Res.

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With the high proportional renewable energy integration and rapid increase in the DC loads, such as the electric vehicle and distributed energy storage, the DC distribution system becomes a prospective solution for the urban power grid enhancement for its high-efficiency and eco-friendly nature. In most DC distribution systems, power interfaces are applied to connect low-voltage DC (LVDC) distribution systems with multiple medium-voltage (MV) systems in order to improve the operating reliability and economy. Compared to other types of multiports power interfaces, the three-port-isolated modular multilevel converter (I-M2C) has shown many advantages, including low cost, high power density, and low control complexity. However, the I-M2C cannot handle the power imbalance at the bipolar LVDC port like the other MMC-based three-port power interfaces, which limits the operating range and decreases the stability of the I-M2C in bipolar LVDC application. In order to solve the bipolar imbalance problems, a novel balance control method is proposed in this article. The proposed balance control method is based on symmetrical decomposition. By decoupling the MV power control and the LV bipolar power compensation control, the proposed method can eliminate the bipolar voltage deviation under different working conditions. The simulation results prove the validity and good control performance of the proposed method.

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Design and Control of Power Fluctuation Delivery for Cell Capacitance Optimization in Multiport Modular Solid-State Transformers

Cited by 51 publications

References 14 publications

Review of a Disruptive Vision of Future Power Grids: A New Path Based on Hybrid AC/DC Grids and Solid-State Transformers

Review of a Disruptive Vision of Future Power Grids: A New Path Based on Hybrid AC/DC Grids and Solid-State Transformers

Flexible control for power‐sharing in the CHB‐based SST under voltage unbalance conditions

LVDC Bipolar Balance Control of I-M2C in Urban AC/DC Hybrid Distribution System

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