Feng Zheng

• Central South University

As an effective carrier of new energy collection, DC power grid has characteristics of low inertia and weak damping, which makes DC fault propagate extremely fast. However, the existing protection and DC circuit breaker (DCCB) technique still could not match its fault propagation speed. Therefore, to solve this problem, a novel of flexible fault cu...

In order to solve the defect that the resistance value of the superconducting quench state cannot be adjusted when a fault occurs. This paper proposes a hybrid superconducting current limiter (H-SFCL) with the bridge circuit topology based on resistance superconducting current limiter (SFCL) and insulated gate bipolar transistors (IGBT) control cur...

To promote the coordinated development between renewable energy and the distribution network, a capacity allocation model of battery energy storage systems (BESS) is proposed to achieve the coordinated optimization for active and reactive power flow, which can reduce the voltage deviation and improve the absorptive capacity for renewable energy. In...

Based on the separation voltage type of cascaded H bridge-modular multilevel converters (CHB-MMC) and current predictive model control (CPMC) technology, a novel flexible fault-current limiter (NFFCL) is firstly proposed for restraining the negative impact of the distribution network’s disturbance in this paper. When a disturbance occurs, the inner...

With the sustainable growth in the integration of distributed generation units in the distribution network, the probability of the fault current level exceeding the rating of existing components increases. Cascaded H bridge fault current limiter is widely used in the power grid due to its advantage in inhibiting surge current flexibly. In order to...

The advance of the dynamic wireless charging technique for electric vehicles makes the electrified transportation system to be the development trend. On the other hand, the interdependency between electricity and natural gas systems has been intensified increasingly with the expansion of renewable energy. This creates a critical motivation to formu...

The rapid growth of gas-fired units and the development of power-to-gas (PtG) technology have strengthened the interdependency of power system and natural gas system and provided a new way for the absorption of renewable energy. This paper proposes a distributionally robust optimization (DRO) scheduling model for the electricity-gas coupled integra...

With the remarkable growth of natural gas consumption and the development of renewable energy worldwide in recent years, the penetration capacity of gas-fired generators and uncertain renewable energy has significantly become larger, which poses a great challenge to the reliable and economic operation of the gas–electricity interconnected system. T...

The increasing expansion of wind and gas turbine installation has intensified the interdependency between power system and natural gas network, which poses great challenges to the coordination scheduling of the multi-energy coupled system (MECS). The data-driven robust optimization (DDRO) model is proposed for the energy coupled system. In this mod...

Comparing with the LCL‐type single‐inverter parallel system, the multi‐inverter parallel system has more complex resonance characteristics which are generated by three type resonance sources (reference current changing in the inverter control system, reciprocal effect among multi‐inverters and grid background harmonic) and cause great negative effe...

One of the most important issues that must be taken into consideration during the planning of energy storage systems (ESSs) is improving distribution network economy, reliability, and stability. This paper presents a two-layer optimization model to determine the optimal siting and sizing of ESSs in the distribution network and their best compromise...

With the continuous expansion of the installation capacity of wind turbines and gas‐fired units, the interdependency between power systems and natural gas systems has increasingly intensified. To deal with wind power uncertainty, an interval optimization‐based cooperative scheduling model for integrated electricity and natural gas systems is propos...

The development of DC distribution network technology has provided a more efficient way for renewable energy accommodation and flexible power supply. A two-stage stochastic scheduling model for the hybrid AC/DC distribution network is proposed to study the active-reactive power coordinated optimal dispatch. In this framework, the wind power scenari...

Relay protection equipment is important to ensure the safe and stable operation of power systems. The risks should be evaluated, which are caused by the failure of relay protection. At present, the fault data and the fault status monitoring information are used to evaluate the failure risks of relay protection. However, there is a lack of attention...

The extensive installation of gas-fired units and the integration of large-scale wind power connected to power grid have strengthened the interdependency between power system and natural gas network. Consequently, wind power uncertainty accompanying with the coupling interaction by gas-fired units has brought new challenges to the safe and economic...

A novel hybrid control strategy for energy storage (ES) is applied in accordance to the recommendations by the IEEE Std. 1676. The strategy mainly consists of the model predictive controller (MPC), two-degree of freedom algorithm and modified droop control. In inverter control layer, MPC and two-degree of freedom algorithm are adopted to construct...

This paper proposes a novel control algorithm to enhance the fault ride-through (FRT) capability of a photovoltaic (PV) system. In this method, the overcurrent of the grid-tied inverter is suppressed to a preset value using model current predictive control (MCPC) algorithm, and its DC-link overvoltage is removed using a non-maximum power point trac...

This paper proposes a hybrid coordination control strategy to improve the low voltage ride-through (LVRT) capability of microgrids. During microgrid external failure, the overcurrent and the voltage sag of the microgrid can be effectively suppressed. Compared with traditional control strategies, the microgrid transient performance can also be enhan...

Since the intermittency and volatility of wind power has restricted its penetration into power grid, coordination scheduling of flexible resources and wind energy becomes a promising technique for promoting wind power utilization. Hence, this paper integrates large-scale electric vehicles (EVs) with wind power generation to formulate multi-objectiv...

Accurate wind power prediction can alleviate the negative influence on power system caused by the integration of wind farms into grid. In this paper, a novel combination model is proposed with the purpose of enhancing short-term wind power prediction precision. Singular spectrum analysis is utilized to decompose the original wind power series into...

As the interdependency between natural gas system and power system is significantly close and the integration of renewable energy with uncertainty and volatility greatly increased in the last decades, the operation security and economics of the gas-electricity integrated energy system has attracted growing concerns. A two-stage distributionally rob...

This paper proposes an advanced hybrid control method to enhance low voltage ride-through (LVRT) capability of grid connected photovoltaic (PV) power plants. Using the proposed method, when a low voltage fault occurs at the point of common coupling, the grid connected inverter overcurrent and its DC-link overvoltage can be effectively suppressed by...

Commutation failure is a serious malfunction in high-voltage direct current (HVdc) converters and is mainly caused by ac side faults, where the change of dc current during fault conditions should be given adequate attention. Employing superconducting fault current limiters (SFCLs) for an HVdc system can suppress its dc fault current’s amplitude and...

In this paper, a resistive-type superconducting fault current limiter (SFCL) is suggested to improve the transient performance of a microgrid system during a fault. The microgrid is connected to the main network at the point of common coupling, where the resistive-type SFCL is applied. When a short-circuit fault happens at the connecting line, the...

Doubly fed induction generators (DFIGs) have attracted a wide interest for wind power generation, but they suffer from high sensitivity to grid disturbances, particularly grid faults. In this paper, a modified flux-coupling-type superconducting fault current limiter (SFCL) is suggested to improve the fault ride-through (FRT) capability of DFIGs. Th...

Based on the considerations in creating a smart grid roadmap, an integrated application of renewable energy sources and superconducting power devices may bring more positive effects. This paper suggests a voltage-compensation-type active superconducting fault current limiter (SFCL) to enhance the fault ride-through capability of doubly fed inductio...

In this paper, a novel inertial control method for Doubly Fed Induction Generator (DFIG) is proposed, namely mode conversion. An excellent inertial response performance is obtained by adopting the mode conversion method. DFIG operating mode can be switched between normal operating mode and inertial response mode by setting logic judgment conditions...

In view of the development of high-temperature superconducting materials, more applications on electric utility devices are used in the power industry. In this paper, a modified flux-coupling-type superconducting fault current limiter (SFCL) is suggested to mitigate the effect of DC short circuit in a voltage source converter-based high-voltage dir...

With the increasing of photovoltaic (PV) penetration in the distribution network recent year, the impact of PV is more and more obvious. This paper first study the mechanism of PV impact on distribution network through the equivalent circuit of grid-tied PV system. Then we establish a typical distributed network model which contain PV generator, th...

In light of the rapid development of the electric power grid, the integrated application of distributed generation (DG) units can be considered as a key driver. Nevertheless, along with large number of DG units are connected into a distribution network, maybe different kinds of effects are accordingly induced. In particular, regarding the configure...

Since the interactivity, integrality and instantaneity of information communication in smart substation have been improved to higher levels, it can contribute to promote the realization of a centralized type substation area backup protection (SABP), acting as an integrated protection system for whole substation. On the side, in the case that fault...