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In order to deal with the voltage drop caused by grid fault, this paper proposes the control strategy of cascaded H-bridge SVG under balanced and unbalanced voltage drop, respectively. In condition of balanced voltage drop, this paper proposes a control strategy which can rapidly compensate reactive power to the grid so that the voltage can be supported in a certain extent. In condition of unbalanced...
Presently, the quality of power supplied is essential to many customers. Power quality (PQ) is a valued utility service where many customers are prepared to pay and get it. In the future, distribution system operators ought to decide, to provide their customers with distinct PQ ranges at different prices. Here, in this paper, a new control action to improve and maintain and enhance the power quality...
The overall system behavior of a three-terminal DC grid with symmetric monopole configuration is the focus of this paper. The modeling of the DC grid test system which includes converter stations, hybrid DC breakers, cables, etc. is carried out in real-time digital simulator (RTDS) platform. For control and protection, ABB's MACH system is used. Some important system aspects of DC grid, e.g. AC fault-ride-through,...
Existing transmission corridors in power systems have to be efficiently utilized because new transmission systems are expensive and the realization is complex and time consuming. Upgrading existing AC transmission systems by adding DC circuits is a potential solution for increasing the transmission capacity of a corridor. It results in an AC and DC hybrid transmission system in which the converter...
A design methodology of a dual active bridge (DAB) converter for solid state transformer applications is proposed using an elaborate mathematical model of the converter. The DAB converter is popular in bi-directional power conversion applications because of soft switching capability and seamless control in bi-directional power flows. However, several design considerations should be considered to overcome...
This paper describes the power system study required by Malaysian Sustainable Energy Development Authority (SEDA) prior to the Distributed Generation (DG) interconnection. A number of DG interconnection guideline and document are described. A case study is used to demonstrate the procedure of steady state analysis. Load flow analysis under steady state conditions and short circuit analysis are discussed...
The IEEE Test Feeders provide a benchmark for the power distribution systems analysis community. This panel summary will provide a discussion of experiences matching the results published by Kersting and Shirek in this panel. [1] Benchmarking the short circuit currents for the Test Feeders is important to users of the Test Feeders for determining whether the system impedances are defined correctly...
DG-energized distribution feeder islands are generally not desired. Anti-islanding schemes based on local detection have significant shortcomings, and can only detect an island after it occurs. A Coordinated Direct Transfer Trip scheme can avoid islanding altogether, but becomes very complex if a feeder is reconfigurable.
Wind generation has been the fastest growing power source over the past decade and this growth is forecasted to continue. Grid code requirements on wind power plant are becoming more stringent as the wind power penetration level increases. In order to identify the risk of incompliant with grid code requirements at the planning stage of a wind power plant project, a standard grid code study process...
The west coast and islands of Taiwan have abundant wind resource, which offers a great opportunity for large-scale offshore wind power generation. In Taiwan, the first stage of offshore wind farms at Jhang-Bin and Peng-Hu areas have been planning. Particularly, the Jhang-Bin wind farm would become the first and one of the largest wind farms in Taiwan. Therefore, its impacts on the system operation...
Admissible range of grid voltage is one of the strictest constraints for the penetration of distributed photovoltaic (PV) generators especially connection to low voltage (LV) public networks. Voltage limits are usually fulfilled either by network reinforcements or limiting of power injections from PVs. In order to increase PV penetration level further, new voltage support control functions for individual...
The rapid increase in installed distributed generation (DG) has led to concerns about the impact on the proper operation of the protection system. In particular, the limited fault current capability of inverter interfaced distributed generation (IIDG) could lead to malfunctioning of the distribution network protection system which largely relies on overcurrent based protection techniques. The absence...
While it is difficult to estimate how much distributed generation (DG) capacity will be connected to distribution systems in the coming years, it is certain that increasing penetration levels require robust tools that help assess the capabilities and requirements of the networks in order to produce the best planning strategies. This work presents an overview of some of the uses to which a tailored...
Grid code requirements on wind power plant are becoming more stringent as the wind power penetration level increasing. In order to identify the risk of incompliance with grid code requirements at the planning stage of a wind power plant project, a standard grid code study process has been established in Vestas. The study process includes steady state load flow, short circuit studies and transient...
The distribution network reconfiguration is a process that consists of changing the status of the network switches for re-routing the power after a fault occurrence, or to optimize some given criteria. Traditionally, feeder reconfiguration is a complex combinatorial and constrained optimization problem because of the numerous combinations of candidate switches. A multi-agent based system for distribution...
Our study aims at minimization of power not supplied (PNS) under the severe fault condition such as a tripping of transmission lines. In this paper, we propose a new static control method which can minimize PNS by coordinately controlling multiple unified power flow controllers (UPFCs), generators and loads. The proposed method is based on multiple optimal power flow (OPF) calculations, and determines...
A multi-terminal DC (MTDC) transmission system based on an innovative modular multilevel converter (MMC) is presented as a feasible approach to address the concerns regarding reliability and fault ride through capability of multi-terminal dc systems. Furthermore, MTDC using MMC may reduce construction costs and power losses in the converter stations. To demonstrate control flexibility, improved reliability...
The capacity of combined heat and power (CHP) generation connected to and urban distribution network will increase significantly as a result of EU government targets and incentives. The connection of CHP at urban distribution level creates a number of technical problems that for individual connections can be mitigated, albeit at a cost to the developer and network operators. For significant volumes...
When distributed generation (e.g., PV) is installed for feeder imbalance, it is difficult to maintain a proper voltage range. In such cases, a loop distribution system has an advantage at voltage fluctuation. A loop power flow controller (LPC) may be expected to control loop distribution systems without any increase in short-circuit current. In this paper, we describe the relationship between loop...
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