In light of the growing complexity and demand in modern power systems, there is an increasing need for reliable, efficient, flexible flow control mechanisms. The Unified Power Flow Controller (UPFC), as a fundamental component Flexible AC Transmission Systems (FACTSs), has garnered considerable attention due to its exceptional capabilities regulating maintaining voltage stability. Nevertheless, expense associated with high-capacity UPFCs considerable, thereby rendering their practical...

The thyristor-controlled phase-shift transformer (TCPST) is an effective means of controlling power flow, exhibiting a simple structure and long operating life. However, conventional TCPSTs are limited in their ability to regulate the phase-shifting angle, necessitating matching step-up/down control amplitude voltages. Therefore, this paper puts forth two distinct structures TCPSTs, each which capable regulating both angle voltages: two-core (TCSUD-TCPST) single-core (SCSUD-TCPST). Moreover,...

To address the issue of curtailment in wind and photovoltaic power due to high penetration distributed renewable energy sources multi-partition distribution networks, enhance operational efficiency voltage quality, a day-ahead intra-day scheduling strategy based on Phase Shifting Transformer (PST) loop-closing device is proposed. The model aims maximize benefits from operations by incorporating errors new load forecasts. Robust optimization techniques are employed solve this model, resulting...

As one of the most effective approaches in dealing with energy crisis, combined electricity and natural gas systems have become more popular worldwide. To take full advantages such hybrid networks, a proper operation control method is required. In this paper, novel approach coordinating heating power generation proposed. First, state excursion rate, criterion describing deviation system operation, defined for evaluation. Then, thermal storage allocated to provide better modes generation. By...

With the high-proportion accession of renewable energy and randomness load side in new power system, unbalanced feeder heavy overload transformer caused by massive access highly uncertain source loads become more serious. In order to solve aforementioned problems, a honeycomb topology multi-station integrated system is proposed. The soft open point (SOP) used as key equipment internal unit system. grid structure composed flexible nodes, multi-network interconnection. Based on characteristics...

Commutation failure is an important factor on safe and stable operation of the receiving-end power grid for high voltage direct current (HVDC) project. A commutation event in Jinsu DC transmission project caused by a complex AC was taken as background, process fault action sequences protection introduced, reason analysed from principle. Real-time digital simulation (RTDS) connected to true-type device ultra-high (UHVDC) control form closed-loop platform. The inversed, result compared with...

Research on evaluation for overload probability, probability-limit and static safety of voltage based stochastic trend, can be used to discover vulnerabilities in the power grid. Wind output, load changes, forced outages generator fault lines other uncertainties were considered. Random disturbances large-scale new energy generation accessing grid concerned, linear Monte Carlo method, probability distribution node voltages branch flow obtained. IEEE-30 test was taken, impact wind limit...

This study proposed an algorithm for calculating the maximum transmission capacity considering unified power flow controller (UPFC). At beginning, equivalent virtual generator, located on ends of UPFC's branch, is obtained based source model UPFC. Then, purpose obtaining range power, (minimum) active/reactive treated as optimising object. Meanwhile, series voltage and shunt current UPFC, well other generators’ reactive are selected control variables. As a result, optimisation could be formed...

A two-stage stochastic model of unit commitment with wind farms is introduced in this paper, which contains AC security constraints. The generating cost thermal units and the expectation dispatching that could be decomposed into units' regulating load shedding penalty are included objective function. Benders theory a auxiliary variable employed to divide whole UC main model, constrained sub-model real-time model. After above procedure, linearization single cut L-shaped method used solve...

In order to study coastal intensive large-scale wind farm output characteristics and interrelatedness, take in Jiangsu as an example, based on the measured power data EMS systems correlation between farms active probability distributions, monthly maximum were analyzed. Studied fluctuations of impact integrated load grid was discussed also peak shaving. It's important for improving new energy efficiency optimizing scheduling distributed operation.

In recent years, renewable energy generations, such as wind power generation, have a rapid development in large scale all over the world. The trend of energy, from auxiliary supply to main even leading supply, is becoming increasing obviously. Due fluctuation and intermittence power, safe stable operation system has been threatened. modeling generation become key factor hotspot issue that influence interaction between plant grid, with scholars domestic overseas weight in. Hence institutions...

This paper studies the interaction characteristics of voltage and frequency between HVDC offshore wind farm in receiving end power grid. Based on concept multi infeed DC interactive influence, propose a fast calculation method for evaluating interaction. Analyses from electrical distance them, equivalent impedance access point system, control strategy UHVDC turbines. The results show that smaller power, greater more obviously effect. It can also get mode inverter side, reactive low have...

In the progress of grid planning schemes selection, annual wind power data in different timescale is needed calculation characters. this paper, a multi-timescale forecasting method based on selection similar days proposed. The will be clustered by scale days, and then LS-SVM model each cluster trained separately. progress, day forecasted selected its as training data. used to get results, time-resolution which level hour. combined into power. A case studied shows that proposed correct effective.

To achieve automatic generation control (AGC), the constant active power is required for wind turbine generators (WTG). The accurate estimation of available (AWP) a prerequisite WTGs to effectively participate in AGC and enhance performance AGC. In such case, maximum point tracking (MPPT) not adopted accordingly MPPT principle cannot be utilized estimate AWP. Therefore, it necessary explore factors influencing AWP undertaking investigate their influence mechanism so that can accurately...

In order to achieve the maximum power extraction below its rated value, wind turbine is generally controlled by point tracking (MPPT) strategies. However, due large inertia of turbines, it difficult adjust rotor speed according highly fluctuant accurately and quickly. Consequently, efficiency energy will not reach theoretical value. To address this problem, a more conservative reference that suitable for sluggish behavior turbines was proposed improve MPPT performance. paper, first-order...

Doubly-fed induction generator (DFIG)-based wind farms integrated by series compensated transmission lines are confronting with the problem of subsynchronous oscillation (SSO). In this study, configuration and control stratagem hybrid compensator composed a static synchronous (SSSC) fixed capacitor proposed, SSO DFIG-based farm studied. The results reveal that risk system is lower using compensator, damping larger higher proportion SSSC in as well compensation impedance or voltage SSSC....

Under the background of large-scale development and utilization clean energy, there are serious security stability risks load balance problems in power grids with high penetration energy portion external supply. Therefore, Jiangsu Electric Power Company has started construction millisecond accurate control system (MALCS). In this article, theoretical basis MALCS is introduced from several aspects: interruptible load, steady state, transient state technique load. On basis, authors put forward...

This paper focuses on the problem of low accuracy when wind farms are dynamically equated without considering impacts collection lines and proposes a dynamic cluster equivalence method coherent generators. Based hierarchical clustering analysis, it considers intra-site lines. Firstly, uses rotor current doubly fed induction generator (DFIG) as characteristic quantity to analyze influence topology in farm (DFWF) process. Then, correlate disturbed trajectory DFIGs obtains results. Finally,...