Bin Wang's research while affiliated with Tsinghua University and other places
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Publications (95)
Due to the demand for temporary rapid grid connection in renewable energy power plants, the topology structure of T-connected power lines has been widely used in the power grid. In this three-terminal system, fault localization is difficult because of traditional impedance-based or traveling wave-based fault localization methods; the three-terminal...
Circuit breakers on the filter bank branches in converter stations are vulnerable to contact wear and mechanical deterioration caused by frequent operations, which can lead to circuit breaker breakdowns and explosions. It is imperative to conduct research on the early detection of abnormal states in circuit breakers. Existing electrical quantity-ba...
To stabilize the frequency of the renewable energy sources (RESs) dominated power system, frequency supports are required by RESs through virtual inertia emulation or droop control in the newly published grid codes. Since the long-term RES prediction involves significant errors, we need online configure the frequency control parameters of RESs in a...
For high wind power-penetrated power systems, the multiple renewable energy station short-circuit ratio (MRSCR) is often insufficient due to weak grid structures. Additionally, transient voltage sag/overvoltage issues may cause trip faults of wind turbines (WTs). Due to the time delay in WTs' controllers, it is difficult for WTs alone to meet the r...
Power system with large scale Inverter-based Resources (IBR) penetration is challenged with insufficient voltage and frequency support capacity. This paper restructures the control blocks of virtual synchronous generator (VSG) from the perspective of traditional synchronous generators’ control, the control path of the system over its active and rea...
Existing compliance control methods take the force/moment precision as the only metric but do not explicitly guarantee the pose precision between assembly objects. In this paper, we first find significant time-variant and coupling characteristics in the process of modelling peg-in-hole assembly. Then, piecewise strategy and decoupling control (PSDC...
To stabilize the frequency of the renewable energy sources (RESs) dominated power system, frequency supports are required by RESs through virtual inertia emulation or droop control in the newly published grid codes. Since the long-term RES prediction involves significant errors, we need online configure the frequency control parameters of RESs in a...
NiFe2O4 takes an attractive potential candidate for oxygen evolution reaction (OER) catalysts, however, its usual preparation based on high-temperature calcination limits exposure of catalytically active sites. Herein, we report a new and efficient strategy for preparing NiFe2O4 supported by three-dimensional graphene network (NFO/3DGN) electrocata...
In this study, we proposed a practical scheme for the challenging robotic cable insertion task. In general, the applied architecture is based on two YOLOs, vision-based pose estimation and admittance control. A precise and effective method was developed to estimate the pose of a manipulated connector. Our method uses a deep convolutional neural net...
The development of efficient carbon dioxide reduction reaction (CO2RR) catalysts is one of the practical solutions to the current environmental problems. Usually, metal-doped catalysts are used for the CO2RR, but the metal elements can easily aggregate, resulting in a reduction in the catalytic performance. In this study, NiFe-LDH was exfoliated to...
The robotic manipulation of a heavy industrial cable is challenging to model and control because of the high number of degrees of freedom and the rigid-flexible coupling dynamics. In this paper, we report the development of modeling the cable effect and control methodology for robotic cable manipulation. Our cable effect model is based on the 2D co...
As massive distributed energy resources (DERs) are integrated into distribution networks (DNs) and the distribution automation facilities are widely deployed, the DNs are evolving to active distribution networks (ADNs). This paper introduces the architecture and main function modules of an integrated distribution management system (IDMS) and its ap...
Abstract Optimal transmission network reconfiguration is an important means to improve the economy and reliability of power grid. However, the traditional optimal transmission switching only considers the transmission line switching strategy and some approximate power flow models are adopted to make it tractable, such as linearisation or convex rel...
Superconducting fault current limiter (SFCL) has been recommended as an idea current limiting method. And Inductive SFCL is one of the potential candidates of SFCL, with its advantages of fast responding, no quench and quick recovery characteristics. Recently years, several ISFCLs have been installed in demonstration projects all around the world....
The correlated renewable energy farms are usually aggregated as a cluster in economic dispatch to relieve computational burden. This strategy can also achieve better performance since the precision of predicting the power generation of a cluster can be higher than those of individual farms. This paper proposes an optimal decomposition method to all...
Chance-constrained economic dispatch (CCED) is widely used to cope with uncertainties brought by renewable energy sources. In CCED, security of power system is guaranteed by restricting risks under permitted level. As the penetration rate of renewable energy increases rapidly, the CCED model may be infeasible because of inadequate system reserve an...
Abstract Real‐time power dispatch can coordinate wind farms, automatic generation control units and non‐automatic generation control units. In real‐time power dispatch, the probable wind power forecast errors should be appropriately formulated to ensure system security with high probability and minimize operational cost. Previous studies and the au...
Massive adoptions of combined heat and power (CHP) units necessitate the coordinated operation of the power system and district heating system (DHS). Exploiting the reconfigurable property of district heating networks (DHNs) provides a potentially cost-effective solution to enhance the flexibility of the power system by readjusting the configuratio...
Double-circuit transmission lines play a very important role in electric power transmission. When a line-to-line nongrounded fault occurs on double-circuit transmission lines, for traditional tripping and reclosing methods, tripping of all six phases may cause power system instability, and fixed time autoreclosing may reclose the double-circuit tra...
Massive adoptions of combined heat and power (CHP) units necessitate the coordinated operation of power system and district heating system (DHS). Exploiting the reconfigurable property of district heating networks (DHNs) provides a cost-effective solution to enhance the flexibility of the power system by redistributing heat loads in DHS. In this pa...
The design of an effective protection system for in-verter-based microgrids is a complicated engineering challenge. This is due to the fact that inverters have limited fault current capabilities, and that the conventional overcurrent protection is not suitable for inverter-based microgrids. This paper introduces a novel protection method for invert...
The cascading fault caused by consecutive commutation failures of HVDC system is a serious problem in AC／DC hybrid power grid，and the lack of self-turn-off ability for thyristors is the essential reason causes commutation failure. AC fault is difficult to predict and the initial commutation failure is inevitable，while both the rapid hop of HVDC con...
To capture the stochastic characteristics of renewable energy generation output, the chance-constrained unit commitment (CCUC) model is widely used. Conventionally, analytical solution for CCUC is usually based on simplified probability assumption or neglecting some operational constraints, otherwise scenar-io-based methods are used to approximate...
Real-time power dispatch (RTD) can coordinate wind farms, automatic generation control (AGC) units and non AGC units. In RTD, the probable wind power forecast errors (WPFE) should be appropriately formulated to ensure system security with high probability and minimize operational cost. Previous studies and our onsite tests show that Cauchy distribu...
This paper proposes two anti-interference adaptive single-phase auto-reclosing (ASPAR) schemes for transmission lines with shunt reactors. This approach is based on faulty phase reactive power characteristics. Instantaneous power algorithm (IPA) is used to calculate the reactive power using voltage and current measurements at only one end of the tr...
Recently, China Power Grid has built a number of multi-infeed AC−DC systems, as the safety issues caused by voltage fluctuations have drawn much attention. The security device of a DC system is applied to correct voltage. First, it brings a new voltage control mode, classifies the DC system control device and disturbance mode, and puts forward an o...
Flux pumps are able to compensate slow current decay in high TC Superconducting (HTS) magnets through noncontact approaches. It is a promising alternative for power sources and thick current leads in operating HTS coils. Following the previous work of a rectifier flux pump, we developed a feedback control system to achieve flexible control of load...
High-impedance fault detection (HIFD) is crucial in an effectively grounded distribution system because of the po-tential threat of fire and electric shock. HIFD has been exten-sively researched for more than 30 years, and a harmonic com-ponent in zero-sequence current is typically used in detection algorithms since waveform distortion is often pro...
High impedance faults (HIFs) are easy to occur in collective feeders in wind farms and may cause the cascading of wind generators tripping. This kind of faults is difficult to be detected by traditional relay or fuse due to the limited fault current values and the situation is worse in wind farms. The mostly adopted HIF detection algorithms are bas...
The transfer characteristics of a secondary circuit consisting of a current transformer) and a secondary cable are critical to the performance of single-ended travelling-wave-based fault locators. The non-ideal nature of the secondary cable often leads to distortion of the recorded travelling waves. In addition, this may lead to wave front identifi...
Backup protection is indispensable, particularly as for adjacent devices. Unfortunately, the backup protection has played a negative role during the overload and power swing, and sometimes caused the cascading tripping blackouts. Therefore, it is necessary to re-recognize the role and the scheme of backup protection. This paper presents an integrat...
Previous work has shown that robust state estimator based on maximum normal measurement rate is accurate and reliable. However, in the existing algorithm, the optimal solutions cannot be obtained due to the approximation of evaluation function. Besides, there are no noise-filtering effects on normal measurements. To deal with these two problems, th...
Recent research has shown that the uncertainty intervals of state variables and measurements can be estimated by solving mathematical programming problems corresponding to the maximization or minimization of a component of these variables. However, the results are not guaranteed since the optimal problems are non-convex and the global optimal solut...
This study deals with guaranteed state estimation of power systems in the bounded-error context, which avoids the effect of inexact matching of the assumed statistical hypotheses on the error. A new approach, based on interval constraint propagation, is proposed to compute guaranteed estimates of state variables and measurements. According to the f...
Although a great amount of achievements on the power system state estimation have been obtained in the past decades, few results about the credibility assessment of state estimation are presented. This paper proposes a Cumulant-based approach to assess the credibility of the estimated results in the case that the true values are unknown. The credib...
Magnitude and duration of voltage sags are the most important two factors to the Lower Voltage Ride Through (LVRT) capacity of the wind generator. Since most voltage sags are caused by the system faults, and sag durations are controlled by the tripping time of overcurrent relay in power collection lines based on the sags' magnitude. The specificati...
Aimed at power system large-scale blackouts, the paper firstly analyzes the existing problems of current protective relaying and emergency control in power grid. A novel system protection based on local information, protecting both the equipment and power system secure is then proposed, which scheme consists of: identification of fault flow transfe...
Since voltage sags are mainly caused by distribution system faults, it is rational to design the sag mitigation schemes from the point of relay protection performance. This paper evaluates the voltage sag mitigation capability of definite-time overcurrent protection by introducing the protection characteristics into the CBEMA curve and analyzing th...
The problem of the low voltage ride through in distribution system with wind farm connections is actually the voltage sags propagation problems. Valid voltage Sag State Estimation (SSE) can check the possible severity of the voltage faced by the wind generators. Since SSE algorithm is a 2nd curve fitting algorithm, the estimation accuracy is mostly...
Small capacity PV substation in power system analysis was considered as the load, but it is not right to the MW PV substation due to so many bulk capacities. In response to this question, the dynamic modeling and transient fault analysis of feeder in distribution system with MW PV substation is researched. The key of the PV modeling is to consider...
MW level photovoltaic generation has enough power to support the partial loads in the island operations. But the challenge is how to balance the power supply and load while the power grid is blackout, and the power supply changes to PV power. In response to this question, the anti-islanding strategy is replaced by balancing the PV output and the lo...
Negative-sequence pilot protection (NSPP) is one of the most widely used protective principles for high-voltage/extra high-voltage transmission lines due to its excellent properties. Properties, such as immunity to system oscillation and the fact that it is not influenced by shunt capacitance, make it especially valuable for the protection of long-...
Aiming at power system large-scale blackouts, this paper analyzed the existing problems in relay protection and emergency control. The criterion of a new system protection, which can protect both the equipment and power system security, is proposed. Focusing on this criterion, this paper presents a system protection scheme based on local informatio...
The performance of the negative sequence pilot protection (NSPP) is less deteriorated by the phase-ground shunt capacitance since the negative sequence current loops in phase-phase lines. Hence NSPP is a good candidate for the main protection in UHV lines with the special characteristic of larger charging current. But as we all known, NSPP is not s...
The performance of two types of current differential protection criteria is investigated by quantitative analysis. Among which, one is the criterion based on phase current differential (PD), and the other is implemented based on the phase-phase current differential (PPD). Some manufacturers claim that the zero sequence current is removed when PPD b...
The impedance algorithm in distance protection for high voltage (HV) and extra high voltage (EHV) lines, although neglecting the influence of shunt capacitance, is able to produce satisfactory performance. However, the accuracy of the algorithm is significantly reduced when applying to ultra high voltage (UHV) lines due to the larger P.U. line shun...
Due to the different ratings of the current transformers (CT) located on different sides of power transformer, only the CT of low ratings will saturate when the power transformer experiences a heavy through fault, leading to false differential current. Such type of external fault can be identified from the internal one if the differential protectio...
Utilizing information of the wide area phasor measurement units (PMU), a novel self-adaptive fault-component based distance protection scheme is proposed. It aims at removing the defects of the conventional fault-component based distance relay. This scheme can adjust the operation threshold dynamically, depending on the real-time parameter measurem...
The paper presents a novel feeder automation system based on non-communication protection and control unit (PCU) without the need of communication. The system can be adaptive to the changes of distribution network configuration. As a fault occurs on a feeder, Non-Communication Protection at the faulted segment's terminals will operate to isolate th...
The necessity for very high accuracy in fault location is generally becoming more and more important. In this paper, a new generalized algorithm which can improve the accuracy of all fault location algorithms based on the lumped parameter model and single-ended data is presented. The measured distance resulting from the lumped parameter model can b...
The precision of impedance fault location algorithm is deteriorated by the extremely large shunt capacitance in UHV line. And the traditional improved ways are all invalid caused by the nonlinearity of measurement impedance in relay and the frequent variations of operation modes in UHV system. In response to this question, a novel impedance fault l...
Several cases of mal-operation of transformer differential protection with second-harmonic blocking after clearance of external fault are reported. These mal-operations all occurred at the nonrestraint region of percentage restraint plane. The previous theory cannot be utilized directly to analyze this phenomenon. Therefore, a mathematical model fo...
The increased interest in using ultra-high-voltage (UHV) transmissions has stimulated the research on UHV operation characteristic and correlative relay protections. Since the operational experience in UHV system is limited, there is a need to model UHV transmission systems and test the performance of traditional protection devices already in use o...
A novel impedance fault location algorithm is proposed for single-line-to-ground fault in UHV transmission line due to the limitation of direct application of traditional impedance algorithm caused by larger shunt capacitance. It is based on the precondition that the negative sequence current phase at meter location can precisely describe the phase...
A criterion using residual voltage and fuzzy decision to improve the successful rate of reclosing is proposed. Residual voltage of the faulted phase still remains after a single phase to ground fault occurs followed by the faulted phase breaking because distributed parameters of the high-voltage transmission line and coupling capacitance between on...
A distributed & hierarchical NN (DHNN) system based on the integrated module architecture and hierarchy architecture is proposed in this paper. The DHNN system adequately uses the powerful function of artificial neural networks at aspects of pattern identification, nonlinear-approaching, associative memory et al. Its information processing mechanis...
A criterion of dual-window transient energy ratio (ER) to improve the adaptability of the self-adaptive autoreclosure of transmission line is proposed. The redundancy of setting of the criterion can be enhanced in comparison with the criterion of single-window transient energy. To effectively extract the high-frequency energy of the voltages, a nov...
Distributed line model should be adopted for Ultra-High-Voltage (UHV) transmission lines, which cause the replacement linear function with hyperbola function between measuring impedance and fault distance for ground impedance relay. The performance of ground impedance relay is sensitive to earth resistance decided by the characteristics of hyperbol...
The increased interest in using ultra-high-voltage (UHV) transmissions has stimulated research in UHV operation characteristic and correlative relay protections. Operational experience in UHV is limited and hence there is a need to model UHV transmission systems and test the operational performance of traditional protection devices already in use o...
Citations
... The first fault can be considered as the transient equivalent circuit formed when switch S I in Figure 3 is closed at t = 0. Due to the extensive analysis of the transient characteristics of the first fault in previous studies [22][23][24][25], this paper does not revisit its features. Instead, the analysis in this paper concentrates exclusively on the characteristics of the secondary fault. ...
... The design of vacuum interrupters profoundly influences the switching performance and lifespan of the switch. Currently, there is a trend towards the miniaturization, cost-effectiveness, and high-voltage capabilities of vacuum interrupters [9][10][11]. ...
... ensure the safe and stable operation of the power grid [10,11], and the value of the load power change caused by the load shedding operation is called the load shedding amount. The secondary power system undertakes the transmission of load control services, and with the deepening of internet services, the demand for information exchange between internet services and energy services has continued to increase, leading to a further increase in the possibility of attacks on the power communication network. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/441167688015872-1482193981385_Q64/Chao-Yang-143.jpg)
... Performance is evaluated under various operating conditions and compared to conventional wind turbines. power production capacity, including onshore and offshore, has grown by a factor of 98 over the past 20 years, ascending from 7.5 GW in 1997 to roughly 733 GW in 2018 [5][6][7][8]. The limit of energy coastal Breeze energy expanded from 178 GW in 2010 to 699 GW in 2020, while the seaward wind limit expanded relatively more, though from a lower base, from 3.1 GW in 2010 to 34.4 GW in 2020. ...
... Consider the very fast response time of IBRs compared with SGs, the response time of DVPP is omitted while that of SGs is set as T SG [11]. The dead bands of droop control are considered in the frequency response model [12]. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/287898931875841-1445651862787_Q64/Wenchuan-Wu.jpg)
... Then corresponding model-based control modules are designed. As indicated in [42], significant nonlinear and coupling characteristics exist in the assembly process, which cannot be well settled by constant model-based control modules. Then, an RL agent is employed adaptively adjust the model-based control modules to enhance the control performance. ...
... Numerous materials have been scrutinized to detect target molecules together with metal nanoparticles, such as hybrid sp 3 -C, sp 2 -C, 2D/3D-architectures, [56][57][58][59] polymers, host-guest, core-shell, and porous carbon-based materials. At present, 3D meso-porous carbon nanomaterials 60,61 have been recommended for showing characteristic structural features like 3D pore-structures with a high degree of graphitization, large surface area, and rich active sites. ...
... Another strategy, as reported by Fu et. al., exposed the active sites of hydrotalcite through solid-phase exfoliation the bulk phase into a monolayer status followed by mixing with melamine and pyrolyzed to obtain NiFe-CN catalysts, which better dispersed the exposed metal active sites and thus improved the CO 2 reduction performance [30]. In summary, the catalytic performance of hydrotalcite can be improved by utilizing its own properties to obtain excellent catalysts towards different electrochemical reactions. ...
... For instance, Haugaard et al. [26] introduced a deep learning approach for pin and hole point estimation in multi-camera setups, facilitating visual servoing for initial alignment. Mou et al. [27] devised a technique for more precise and efficient position estimation of manipulated connectors, leveraging YOLO-based relevant region detection. [28] propose a 6D pose estimation of template geometries, to which manipulation objects should be connected. ...
... An important method of model-based strategy is to establish explicit equations between environmental characteristics or contact force and axial attitude. Gai et al. [8] discovered significant time-varying and coupling characteristics in the modeling process of the peg-in-hole insertion task and developed a piecewise strategy and a decoupled control (PSDC) method to improve the pose accuracy between the peg and the hole. Park et al. [9] analyzed four contact states of the peg-in-hole insertion task. ...
