Siqi Bu

Siqi Bu
The Hong Kong Polytechnic University | PolyU · Department of Electrical Engineering

PhD CEng SMIEEE

About

166
Publications
24,029
Reads
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1,721
Citations
Citations since 2016
146 Research Items
1591 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Introduction
I was a National Transmission System Planner and Operator with National Grid UK, and I am an Associate Professor with Hong Kong Polytechnic University.
Additional affiliations
August 2012 - March 2016
National Grid Plc
Position
  • UK National Transmission Planner and Operator

Publications

Publications (166)
Article
Full-text available
Oscillatory stability has received immense attention in recent years due to the significant increase of power-electronic converter (PEC)-interfaced renewable energy sources. Synchrophasor technology offers superior capability to measure and monitor power systems in real time, and power system operators require better understanding of how it can be...
Article
Full-text available
Situation awareness (SA) has been recognized as a critical guarantee for the stable and secure operation of electric power systems, especially under complex uncertainties after renewable energy integration. In this paper, an artificial-intelligence-powered solution is presented to reach a full realization of SA covering perception, comprehension an...
Article
Full-text available
The capability of on-board bidirectional chargers to deliver both real and reactive power makes electric vehicles (EVs) become suitable candidates for the voltage regulation in the distribution network considering the higher R/X ratio of distribution lines. This paper proposes a distributed voltage regulation scheme for dominantly resistive distrib...
Article
Full-text available
In the presence of geographically dispersed distributed energy resources (DERs), the microgrid (MG) can be organized into a number of nanogrids (NGs) which provides an efficient approach to aggregating DERs for the participation of ancillary service with a high level of efficiency and controllability. In this regard, this paper presents a multi-mar...
Article
Full-text available
Full converter-based wind power generation (FCWG, e.g., a permanent magnet synchronous generator (PMSG)), though normally considered to be decoupled from the external power grid can be actuated as an inertia source to suppress modal resonance in wind generation penetrated power systems by installing auxiliary resonance controllers (ARCs). In this p...
Article
As wind power continues to integrate into modern power systems, the bidding strategies of wind power producers are becoming more important than ever. However, the current trading strategies of wind power producers may be impractical because their market uncertainties, financial risk, and cooperative behaviors are generally not considered. Therefore...
Article
Full-text available
With increasing penetration of renewable energy in power systems, conventional unit commitment (UC) focusing on static constraints may fail to meet dynamic constraints, such as converter-driven stability. This paper proposes a practical paradigm to perform UC considering the requirement of converter-driven stability in wind generation penetrated po...
Article
Full-text available
Incidents of sub‐synchronous oscillations (SSOs) reported in the Hami power network of western China indicate that the torsional dynamics of a synchronous generator (SG) can be excited by a grid‐connected wind farm and trigger torsional SSOs. The concept of open‐loop modal resonance (OLMR) reveals the excitation mechanism from the standpoint of sys...
Article
Full-text available
The increasing penetration of renewable generations, along with the deregulation and marketization of power industry, promotes the transformation of energy market operation paradigms. The optimal bidding strategy and dispatching methodologies under these new paradigms are prioritized concerns for both market participants and power system operators....
Article
Full-text available
This paper presents a comprehensive analysis of the consumer-centric business model for rooftop solar PV installations in India. We explore areas where potential policy interventions may be introduced to improve collective stakeholder benefits and incentivize more domestic consumers to adopt rooftop solar power generation in their premises. The pro...
Conference Paper
Inverter-based resources (IBRs) are key components in future power electronics dominated power systems. Virtual synchronous generator control-based IBRs will take the role of a certain number of synchronous generators (SGs). Although VSG imitates SG using control loops, it still demonstrates different dynamic performances and is worth a careful stu...
Article
The exponential growth of renewable energy generation, electronic loads, and electromobility in active distribution networks has severe consequences on the network's power quality (PQ) and economic impacts on the utility. The conventional active energy tariff for low-voltage (LV) consumers do not consider the cost associated with the PQ parameters,...
Preprint
Full-text available
The paper contains the online supplementary materials for "Data-Driven Prediction and Evaluation on Future Impact of Energy Transition Policies in Smart Regions". We review the renewable energy development and policies in the three metropolitan cities/regions over recent decades. Depending on the geographic variations in the types and quantities of...
Article
Full-text available
The penetration of photovoltaic (PV) power into modern power systems brings enormous economic and environmental benefits due to its cleanness and inexhaustibility. Therefore, accurate PV power forecasting is a pressing and rigid demand to reduce the negative impact of its randomness and intermittency on modern power systems. In this paper, we explo...
Chapter
The utilisation of HVDC transmission has brought complex dynamics to the conventional AC power grids dominated by the synchronous generator. Rotor angle stability, as one of the major dynamic concerns, has been considerably affected by the frequent interactions with different HVDC systems. This chapter provides a comprehensive overview on the conce...
Conference Paper
In this paper, a novel energy flow analysis (EFA) is proposed based on the signal reconstruction and decomposition to investigate the electromechanical oscillations. In contrast to the conventional EFA, the connection between the proposed EFA and modal analysis (MA) can be quantitatively revealed for arbitrary models of synchronous generators in mu...
Article
Full-text available
The deregulated active distribution network (ADN) would incorporate numerous autonomous stakeholders, including some emerging distributed virtual alliances (DVAs) like virtual microgrids and virtual power plants. Those DVAs would autonomously participate in energy market trading through bidding among themselves and dispatching conducted by the ADN....
Article
Treynor Ratio (TR), a reward to volatility measure in finance, is used to quantify excess return per unit risk taken by the investor, where risk implies volatility in returns relative to market portfolio return. In this paper, TR is modified (TREP) to suggest the hourly weight of each risky energy asset at which it is worth using in the transmissio...
Article
Full-text available
The harmonics and reactive power have severe consequences on the power electronics-enabled distribution networks. Imposing a penalty to a consumer for violation of limits and providing an incentive for utility-related problems promote good practices. Therefore, we need to reframe the prevailing tariff structure to improve the power quality (PQ) of...
Article
Full-text available
The increasing penetration of renewable energy sources (RES) and electric vehicles (EVs) demands the building of a microgrid energy portfolio that is cost‐effective and robust against generation uncertainties (energy risk). Energy risk may trigger financial risk in the local energy market, depending on bid values, cost of generation and price of up...
Article
Metaverse is a new stage of digital revolution, which transforms the universe to highly interactive and hyper-spatiotemporal eco-system supported by multiple technologies. The application of metaverse in the power system can further improve the informatization and intellectualization of the system, becoming the next generation smart grid. This pape...
Article
Potential malicious cyber-attacks to power systems which are connected to a wide range of stakeholders from the top to tail will impose significant societal risks and challenges. The timely detection and defense are of crucial importance for safe and reliable operation of cyber-physical power systems (CPPSs). This paper presents a comprehensive rev...
Preprint
Full-text available
The increasing penetration of renewable generations, along with the deregulation and marketization of power industry, promotes the transformation of power market operation paradigms. The optimal bidding strategy and dispatching methodology under these new paradigms are prioritized concerns for both market participants and power system operators, wi...
Article
Full-text available
It is vital to improve the stability of the power system by accurately identifying the modal parameters of damped low-frequency oscillations (DLFO) and controlling the oscillation in time. A new method based on empirical mode decomposition (EMD), stochastic subspace identification (SSI), and Prony algorithms, called synthetical modal parameters ide...
Article
Full-text available
The machine-side oscillation (MSO) of the full converter-based wind generation (FCWG) systems is a critical threat to the reliable wind power supply. The introduction of the auxiliary resonance controller (ARC) to the machine-side converter (MSC) controls of FCWG can effectively improve the converter-driven stability of the power grid, but it would...
Article
Due to the shortage of freshwater and energy crisis, seawater desalination with renewable energy has been proposed. A method for determining optimal planning of coastal hybrid renewable energy system (HRES) is proposed in this paper. Firstly, the system composition is introduced, and the virtual energy storage (VES) characteristics of the seawater...
Article
Full-text available
The damping performance evaluation for electro-mechanical oscillations in power systems is crucial for the stable operation of modern power systems. In this paper, the connection between two commonly-used damping performance evaluation methods, i.e., the damping torque analysis (DTA) and energy flow analysis (EFA), are systematically examined and r...
Article
This paper proposes a multi-energy trading framework for a hybrid-renewable-to-H2 provider (HP) to coordinate the interaction and trading of electricity and H2 while promoting the efficient accommodation of renewable energy resources (RESs). In this framework, the HP can harvest hybrid RESs for green H2 production based on electrochemical effects o...
Article
Full-text available
This paper proposes two-level ensemble methods for an efficient risk assessment of the maximal frequency deviation (MFD) caused by stochastic outputs of the multiple renewable energy sources (RESs) in the operational planning. At the foundation level, an ensemble method (PAM-CH) is proposed to enable a fast evaluation and region visualization of MF...
Article
Full-text available
Massive integration of converter-interfaced distributed energy resources (CDERs) has resulted in many emerging stability issues and significantly complicated the dynamics of active distribution networks (ADNs). Large quantities of CDER systems with complex structures, time-varying parameters and ‘black-box’ controllers not only make the system mode...
Article
Full-text available
Fast and reliable transient stability assessment (TSA) is significant for safe and stable power system operation. Deep learning provides a new tool for TSA. However, it is difficult to apply the TSA models based on deep learning practically because of their inexplicability. Therefore, an interpretable time-adaptive model based on a dual-stage atten...
Chapter
This chapter delineates the fundamental and advanced concepts associated with frequency stability and control of hybrid AC/DC power grids. As power grids are transforming to hybrid AC/DC power grids with HVDC transmission systems and high penetration of power electronic converter (PEC) interfaced renewable power generation sources, the electrical d...
Chapter
In contrast to the conventional synchronous generators, power electronic converter interfaced renewable power generation, such as wind and solar-PV plants is typically sited in remote geographic locations in the power grid. Therefore, inevitably, the generated power from these sources has to be transmitted through long-distance transmission corrido...
Chapter
Voltage stability is considered as one of the key concerns of hybrid AC/DC power grids, the mechanism of which can be quite complicated and involves multiple factors. This chapter provides a comprehensive overview on the concepts, and main causes and analysis methods of two voltage stability issues including the large-disturbance and small-disturba...
Chapter
Modelling and control of hybrid AC/DC power grids are of paramount importance for power grid stability and dynamics studies. Therefore, accurate representation of the AC and DC grid equipment is vital to capture the stability boundaries of the hybrid AC/DC power grid. This chapter provides a comprehensive overview on the modelling and control techn...
Chapter
This chapter introduces different HVDC technologies used in HVDC systems with fundamental theories associated with each HVDC technology. The line commutated converter HVDC technology is introduced with details of different line commutated converter HVDC topologies and the fundamental operation principles of line commutated converter HVDC technology...
Book
This book covers modeling, control and stability aspects of hybrid AC/DC power networks. More specifically, this book provides an in-depth analysis of the stability and control aspects of hybrid AC/DC power grids, with comprehensive coverage of theoretical aspects of conventional stability issues (e.g., small-signal stability, voltage stability and...
Chapter
This chapter introduces coordinated control schemes used in hybrid AC/DC power networks. A variety of control schemes including control schemes which can control multiple system parameters, realise balanced power sharing, minimise transmission power losses, and damp oscillations are discussed in this chapter. Moreover, the model predictive control...
Article
This paper proposes a novel bilateral inertia and damping emulation (BIDE) control scheme for VSC-HVDC transmission systems that can autonomously provide inertial and damping responses to two VSC-HVDC interconnected asynchronous AC grids in a similar fashion of synchronous generators. For each VSC station, the energy for inertia emulation comes fro...
Article
This paper proposes a novel imbalance-status (IS)-enabled autonomous global power-sharing scheme for a solid-state transformer (SST) interconnected hybrid AC / DC microgrid system. Firstly, the proposed scheme globally estimates instantaneous active power imbalances according to the existing droop regulation characteristics of each sub-microgrid, a...
Article
Full-text available
The joint Peer-to-Peer (P2P) electricity market (EM) and carbon emission auction market (CEAM) among prosumer microgrids (MGs) in the distribution network is a promising paradigm to facilitate the participation of distributed energy resources (DERs) and incentivize the decarbonization. In this market, MGs will modify their bidding strategies to be...
Conference Paper
With the wide application of the measurement and communication technology in the modern power grid, the physical coupling degree of the information has been gradually deepened in the power network. Under this condition, the cyber-physical power system (CPPS) arises at the right moment. The phasor measurement unit (PMU) is the essential part of CPPS...
Conference Paper
The small-signal stability analysis is of great significance for the secure operation of power systems. The most widely used tool for small-signal stability analysis is Lyapunov’s first method which requires the detailed modeling of the system and the calculation of eigenvalues. In order to avoid the time-consuming calculation of eigenvalues, some...
Article
Full-text available
Driven by the fact that the structural topology of the communication network has a significant effect on the dynamical performance of the related physical network, this paper addresses the communication network planning problem for islanded microgrids (MGs). The optimal communication topology with the lowest communication cost, which supports the d...
Article
Full-text available
In the context of the current development of active distribution grids, flexible loads including seawater desalination have been introduced into the distribution grid as important resources in order to improve the ability of source-grid-load interaction. This paper focuses on the seawater desalination loads, and comprehensively considers the demand...
Article
Full-text available
Regarding the modern power smart grid, distribution consumers and prosumers are highly concerned about power quality (PQ). In fact, they would prefer to pay higher prices for a reliable and good quality power supply. Unfortunately, utility operators still aim for reliability alone, ignoring the quality of supply voltage and current. There are no cl...
Article
Few studies have focused on assessing the transient and steady-state voltage stability status of dynamic systems simultaneously. This motivated us to propose a new concept referred to as joint voltage stability assessment (JVSA). Towards this end, this paper proposes a novel data-driven JVSA method considering load uncertainty. It combines multiple...
Article
Full-text available
In order to incorporate the independent Virtual Microgrids (VMGs) to the real-time operation of upstream active distribution network (ADN), an interactive dispatching model of VMGs and ADN is proposed, in which the downstream VMGs perform self-dispatching while trading both energy and ancillary service procurement to the Distribution System Operato...
Article
Full-text available
Local heterogeneity of the frequency response of modern grids becomes more severe than ever before due to 1) weaker grid connection strength brought by the favorable grid interconnection, and 2) more uncertainties and less system inertia brought by the increasing renewable integration. This dominant characteristic is difficult to be accurately char...
Article
Full-text available
This paper proposes a load transfer optimization (LTO) model involving hot-spot temperature (HST) and top-oil temperature (TOT) limits of transformers. This work aims to address the overload problem and trans-former HST and TOT excursions via LTO. First, the equivalent thermal model for the HST and TOT of transformers under external cooling con-dit...
Preprint
Full-text available
This paper presents a novel framework for cooperative trading in a price-maker wind power producer, that participates in the short-term electricity balance markets. In this framework, market price uncertainty is first modeled using a price uncertainty predictor, consisting of ridge regression (RR), nonpooling convolutional neural network (NPCNN), a...
Preprint
Full-text available
This paper presents a novel framework for cooperative trading in a price-maker wind power producer, that participates in the short-term electricity balance markets. In this framework, market price uncertainty is first modeled using a price uncertainty predictor, consisting of ridge regression (RR), nonpooling convolutional neural network (NPCNN), a...
Book
Power network operators are rapidly incorporating wind power generation into their power grids to meet the widely accepted carbon neutrality targets and facilitate the transition from conventional fossil-fuel energy sources to clean and low-carbon renewable energy sources. Complex stability issues, such as frequency, voltage, and oscillatory instab...
Article
When the deep learning network is used to realize the transient stability assessment of the power system, the classification performance of the assessment algorithm is greatly affected due to the insufficient sample diversity and the poor anti-interference. In view of the above problems, this paper proposes a transient stability assessment method b...
Article
Full-text available
In this paper, a novel energy flow analysis (EFA) is proposed based on the signal reconstruction and decomposition to investigate the electromechanical oscillations. In contrast to the conventional EFA, the connection between the proposed EFA and modal analysis (MA) can be quantitatively revealed for arbitrary models of synchronous generators in mu...
Article
Full-text available
In this letter, the evolutionary game theory (EGT) with replication dynamic equations (RDEs) is adopted to explicitly determine the factors affecting energy providers (EPs) willingness of using the market power to uplift the price in the bidding procedure, which could be simulated using the win-or-learn-fast policy hill climbing (WoLF-PHC) algorith...
Preprint
Full-text available
BACKGROUND: Domestic solar PV installations in India are yet to become a valuable proposition for both the prosumers and utility because of the deficiencies in the formulation of the policy parameters. This paper presents a comprehensive analysis of the consumer-centric business model for rooftop solar PV installations in India. We explore areas wh...
Conference Paper
This paper proposes a novel method to improve electricity experience for normal electric users, aiming at reduce the adverse impact of plug-in hybrid electric vehicle (PHEV) charging behavior on normal electric users under gas station network attacked. When gas station network is attacked, more power is required from grid to PHEVs, leading to the r...
Article
Full-text available
Renewable energy sources such as wind power and photovoltaics (PVs) have been increasingly integrated into the power system through power electronic converters in recent years. However, power electronic converter-driven stability has issues under specific circumstances, for instance, modal resonances might deteriorate the dynamic performance of the...
Article
Full-text available
Power network operators are rapidly incorporating wind power generation into their power grids to meet the widely accepted carbon neutrality targets and facilitate the transition from conventional fossil-fuel energy sources to the clean and low-carbon renewable energy sources [...]
Article
Full-text available
This paper proposes a novel variable-inertia emulation control (VIEC) scheme that enables voltage-source-converter based high-voltage DC (VSC-HVDC) transmission systems to flexibly support AC grid frequency stability like synchronous generator. The VIEC scheme allows us to extract the energy from the augmented DC capacitance for inertia emulation b...
Preprint
Full-text available
Various renewable energy sources such as wind power and photovoltaic (PV) have been increasingly integrated into the power system through power electronic converters in recent years. However, power electronic converter-driven stability issues under specific circumstances, for instance, modal resonances might deteriorate the dynamic performance of t...
Article
The majority of traditional techniques for voltage stability assessment do not account for load power-voltage characteristics and assume a constant PQ load model, which is proven unreliable especially if the system load contains a large percentage of induction motor loads. This work presents a generalized voltage stability index which has two impor...