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This paper proposes a method to determine optimal locations to deploy edge-of-grid low-voltage static var compensator (SVC) devices in large real-world distribution circuits. The SVC device operation, characteristics, and modeling are also discussed. The optimization problem formulation developed in this work has the objective of mitigating undervoltage violations in the circuit using the minimum...
This paper introduces operation and control of fixed capacitor thyristor binary switched reactor. The proposed system is used for Voltage Regulation and Reactive Power Compensation of the transmission system. It consists of reactor banks, arranged in binary order steps with fixed capacitor is referred as FC-TBSR. Normally we use SVC (TSC+TCR) for reactive power compensation and voltage regulation...
In order to help combat climate change, Japan plans to introduce a large-scale photovoltaic (PV) power generation capacity. In this paper, we focus on reactive power in large-scale PV systems, first proposing a two-layered shunt capacitor (SC) scheduling method using multi-objective particle swarm optimization (MOPSO) and dynamic programming (DP). Using MOPSO, cost efficiency and reliability in power...
A modular and scalable concept of voltage regulation for enhancing service continuity and increasing power rating in single-phase series voltage regulator is proposed. It is based on paralleling multiple series-voltage compensators, namely Multi-Parallel-Connected SeriesVoltage Compensator (MSVC), to perform output voltage regulation. The output current of each compensator is coupled to another one...
Ultra high voltage (UHV) AC system operates at 1000kV or above and is characterised with having a large transmission capacity (5000MW or above per single circuit) and long transmission distances. It is capable of producing over 4 times more reactive power gains than a conventional 500kV transmission line, and also absorbing a significant amount of reactive power when power flow across the line is...
This paper suggests a new switching algorithm for multilevel Z-source inverter. The proposed switching algorithm is based on space vector control (SVC), and employs cascaded H-bridge multilevel inverter, which generates a voltage vector with very low harmonic distortion and reduced switching frequency. Use of Z-network in this topology causes more reliability and bucking or boosting capability of...
This paper describes an SVC model including representation of the MV Bus and associated step-up transformer. In addition to providing insight on the inner workings of an SVC, such modeling allows representation of protective functions such as MV bus voltage limiter and TCR current limiter. The model is appropriate for simulations ranging from the short-term electromechanical dynamics to the extended-term...
This paper presents a new design strategy for Symmetric Voltage Cancellation (SVC) Control used in LCL converters for Inductive Power Transfer (IPT) Systems. It was found that the operating mode that eliminated diode reverse recovery losses in the H-bridge had particularly low losses. An analytical technique is used to calculate the operating modes. Three common control schemes used in LCL converters...
This paper presents a voltage swell compensator based on a switched autotransformer by random hysteresis voltage control. The advantage of this compensator is that it uses only one controlled switch per phase with no energy storages. Also the control scheme purposed here distributes the harmonic spectrum of the load voltage and reduces its total harmonic distortion (THD). Different voltage swell events...
According to the problem that D-STATCOM is difficult to promote for its high price, this paper proposes a mixing application idea of D-STATCOM and switched capacitor. As for one group of switched capacitor and D-STATCOM, a minimize loss switching strategy is presented to achieve the optimization of overall loss. And for multiple groups of switched capacitor and D-STATCOM, a cooperative control tactics...
With respect to the deficiency of the output modeling, topology modeling and switching function modeling of the STATCOM, this paper states the voltage regulating principle of the STATCOM and analyzes the switch characteristics of the voltage source converter controlled by the SPWM, then deduces the duty ratio of each switches based on the switching function. Then, introduces the switching system concept...
The performance of the DSTATCOM depends on the control algorithm i.e. the extraction of the current components. So, for this, there are various control algorithms for the control of DSTATCOM block depending on various theories and strategies like phase shift control, instantaneous PQ theory, synchronous frame theory, Adaline based theory. Each of the algorithms specified have their own merits and...
Voltage source converter based DSTATCOM has been accepted as the most preferred solution for reactive power management in distribution power networks which plays a vital role in improving power quality, correcting power factor and maintaining constant distribution voltages. However, the quality of DSTATCOM output voltage and current itself, such as injected harmonics and Total Harmonic Distortion...
Adjustable speed drives (ASD) employing induction motors are widely used in the industrials and process control in the form of varied applications such as fans, compressors, pumps etc. They are energy efficient and can result in substantial energy saving when properly installed. However, they inject high harmonic content into current drawn from the AC system. This paper deals with the application...
The paper presents a nine-level selective harmonic elimination pulse width modulation (SHE-PWM) cascaded voltage source converter based STATCOM system. The structure allows direct connection to the grid without the need of any step-up transformers. The converter is controlled with the SHE-PWM technique which provides an elimination to lower order harmonics to improve output waveforms and furthermore,...
A novel controllable rectifier type SVC's topology has been proposed comparing with the traditional SVC. What's more, the novel SVC can be also easily configured as a de-icing device by changing the position of internal switch. Compared with the traditional TCR type SVC this controllable rectifier type SVC features simple switch operation between de-icing mode and SVC mode. The preliminary feasible...
Reference signals are generally generated for various applications in current waveforms, including active and reactive power control, voltage regulation and unbalance compensation. Current modulators (e.g. hysteresis method) are dynamically fast and simple to implement. However, variable high switching frequencies result in lower efficiency compared to other modulators. In the mean time, if references...
Dynamic capacitive VARs are becoming more important in the modern power system. This paper gives an examination of the behavior of a dynamic capacitor based on buck and boost cells. The principle of operation and the characteristics are explained. The basic principle is extended to the series connection of cells to reach higher voltages. A simulation case is provided to demonstrate the effectiveness...
The paper presents the results of few numerical applications for sustaining the idea of unbalancing transversal capacitive compensation like a method for balancing the load of the electrical distribution networks and consequently to increase the voltage quality and the efficiency. The load balancing, analytical described by the annulment of negative component of the currents on the load phases, is...
One of the main problems when H-bridge multilevel converter is used for compensating reactive power is the DC link regulation; this is because of different losses into each cell. In this paper a DC link regulation strategy is obtained through a power analysis. It is shown how the strategy can be applied as much an asymmetric as a symmetric multilevel converters-based STATCOM. Some of simulation and...
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