In a real installation, the magnitude of the source. Modeling and analysis of 24pulse gtobased statcom for. The dstatcom basically consists of a coupling transformer. Operation of 3 mvar distributions statcom is observed when it is connected to a bus b2. Usually, statcom is installed at the mv bus in the wind farm. This work shows a study of the statcom operating in unbalanced systems with negative sequence components. When used with voltage source converter, its ac output voltage is controlled such that the required reactive power flow can be controlled at the generatorload bus with which it is connected. Sep 26, 2011 statcom static synchronous compensator monday, september 26, 2011 statcom or static synchronous compensator is a shunt device, which uses forcecommutated power electronics i. Since the current amplitude can be continuously controlled by adjusting vc, statcom works as a capacitor whose capacitance can be continuously controlled.
In this paper we study the shunt operation of facts controller, the statcom. Operation, modeling, control and applications of static. The principle of operation of the statcom is explained on the figure below, which shows the active and reactive power transfer between sources v1 and v2. Statcom static synchronous compensator working principle. Working principle diagram for htsvg lv statcom as shown in fig. Statcom technology for wind parks to meet grid code requirements 310 3bhs237435 zab e01 3 the statcom solution 3. The statcom is a shunt device of the flexible ac transmission systems facts family using power. Operational principle the operational principle is very basic it needs to give the given measure of reactive power when required and ingest the active power or reactive power when required as needs be. The exchanging of the power between the dstatcom and the ac system is just constrained by the electronic control system. In this case study it is reported that cfct of statcom is 80ms faster than svc.
Implement phasor model of threephase static synchronous. Inductive output if vc statcom will operate in floating mode. This paper describes the modeling of statcom along with the. Facts controllers in power transmission and distribution 10. Statcom detailed mmc model with 22 power modules per phase. A static synchronous compensator, also known as a static synchronous condenser, is a regulating. A static synchronous compensator statcom, also known as a static synchronous condenser statcon, is a regulating device used on alternating current electricity transmission networks. Statcom or static synchronous compensator is a shunt device, which uses forcecommutated power electronics i.
Benefits of svc and statcom for electric utility application. The statcom basically performs the same function as the static var compensators but with some advantages. Also, the study is extended for ieee 30 bus system. A statcom offers better dynamic performance than a svc, in particular a faster response time as well as the ability to generate or absorb reactive power when the grid voltage drops. This is achieved through reschedul ing the reactive power control variables of statcom. The statcom generates or absorbs reactive power by producing a controlled voltage waveform. Statcom uses vsc technology which enables 4qudrant operation in case of active power exchange possibility. Individual phase fullpower testing method for highpower statcom.
Statcom operation the phasor diagram in figure 8 helps to understand the principle of the statcom. If v v s pu values, no current ows through r tr and l tr. It can seem that one phase port of the normal statcom is disconnected from the grid, and then shorted to one of the other two phases. Statcom a statcom is used where traditional solutions wont work able to autonomously control the voltage resulting in a much faster power factor correction continuously variable output without steps, no harmonics, no transients can generate and absorb reactive power. Power system stability improvement using facts devices. We have performed the comprehensive modeling of statcom placement for power flow study. Its aim is to help the wind farm in situations of voltage dips, voltage regulation, power factor control and power ow stabilizing. In this paper, basic principle of statcom operation and the functions of each component are explained.
Operating principle of d statcom the power electronic based three phase reactive power compensation equipment is the d statcom, which generates and or absorbs the reactive power whose output can be varied so as to maintain control of specific parameters of the electric power system. Strategies for reactive power control in wind farms with. If you are not familiar with the statcom, please refer to the static synchronous compensator phasor type block documentation, which describes the statcom principle of operation. Statcom is in principle a controlled voltage source. Basic operation statcom is a device, which use to generate or absorb reactive power. It is observed that by appropriate reactive shunt compensation steady state transmittable power is increased and voltage profile in the line also maintained.
Vsc principle has been used in this paper to perform the modeling and analysis of such controllers for a wide range of operating conditions 3. Depending on the amplitude of these tensions, the three following operating systems are available for the d statcom. In this lecture i will teach you about statcom working principle, design and application. It is also a member of the socalled flexible ac transmission system facts devices. Static compensator statcom the emergence of facts devices and in particular gto thyristorbased statcom has enabled such technology to be proposed as serious competitive alternatives to conventional svc 21 a static synchronous compensator statcom is a regulating device used on alternating current. The statcom consist of a coupling transformer,converterinverter circuit, and a dc capacitor, which is shown in fig. Controller design of statcom for power system stability improvement using honey bee mating optimization, a. Design, analysis and simulation of linear controller of a. The principle operation modes of the d statcom output current, i which varies depending upon v o i v v o x 1. Operation principle operation mode waveform phasor diagram remark noload ics 0, if vs vc capacitive output if vc vs, ics is leading current. Depending on the power rating of the statcom, different technologies are used for the power converter.
Statcom functions with a very limited need for harmonic filters, contributing to a small physical footprint. In this paper, svc and statcom operation on voltage collapse are described the critical fault clearing time. When vsc voltage equal in magnitude to system voltage v s v s v s v l 0 if v c v s, then i 0 v l 0 i 0 i 0 v c v c v t c statcom in inductive mode with lagging current output. Modelling and simulation of statcom for reactive power and. Static synchronous compensators an overview sciencedirect. The drones play the father role in the colony that. Statcom basic operation statcom static synchronous compensator or known as asvg advanced static var generator is a solidstate voltage source inverter that is coupled with a transformer and connected to a transmission line. Statcom the voltagesourced converter vsc is the basic electronic part of a statcom, which converts the dc voltage into a threephase set of output voltages with desired amplitude, frequency, and phase. Statcom static synchronous compensator power quality in. Its principle of operation is similar to that of a synchronous condenser. The example described in this section illustrates application of simscape electrical specialized power systems software to study the steadystate and dynamic performance of a static synchronous compensator statcom on a transmission system. A statcom is also well suited for industrial applications to.
Svc light is a vsc concept, based on a chainlink modular multilevel converter mmc. Statcom static synchronous compensator power quality. Effect of statcom location on distance protection relay. Reactive power compensation techniques in transmission. Abstract the statcom static synchronous compensator is a shunt connected voltage source converter using selfcommutating device and can be effectively used for reactive power control. It can be reached by parallel connection of a battery to the dc capacitor. So statcom can bring the unstable system in stable system faster than svc. Statcom provides shunt compensation in a similar way as svc but utilizes a voltage source converter rather shunt capacitors and reactors 7. Basic principles of operation the statcom system is shunt connected to the transmission grid. When statcom is in operation voltage sag and voltage swell condition can be improved as shown in a figure 8.
Facts controllers in power transmission and distribution. Principles and recommendations for population and housing. If connected to a source of power it can also provide active ac. The dc voltage across the dc capacitor cdc of the statcom is controlled to be constant for normal operation of the pwm inverter. Modelling and simulation of statcom for reactive power.
Study on a novel statcom with lc series filter xinwen zhang1,2. Basic operating characteristics of statcom are verified by the simulation. Var compensators enhance the stability of the ac system by increasing the maximum active power that can be transmitted. The d statcom basically consists of a coupling transformer. The reactive power exchange with the network is done by varying the amplitude of the output voltages. The designed controllers with variation of dclink voltage have been applied to the statcom. The mmcstatcom is built using the fullbridge mmc block to represent a power electronics converter of 22 modules per phase. Sizing of statcom to enhance voltage stability of power. Abbs offerings in the high power statcom field include svc light statcom as well as pcs 6000 statcom, where pcs 6000 statcom is applicable for unit ratings up to 40 mvar and svc light statcom is applicable for ratings exceeding 40 mvar. This paper describes the linear modeling of statcom along with design of current and voltage controllers. Study and simulation of the svc and statcom effect on. The statcom operates according to voltage source principles, combining unique pwm pulse width modulation switching in igbts insulated gate bipolar transistors. The operation of the proposed control method is presented for d statcom and dvr.
There are voltage transformers vts in the statcom that measure the voltage of the grid. Operation, modeling, control and applications of static synchronous compensator. Controller design of statcom for power system stability. In this figure, v1 represents the system voltage to be controlled and v2 is the voltage generated by the vsc. The basic principle of operation of a statcom is the generation of a controllable ac voltage source behind a transformer leakage reactance by a voltage source converter connected to a dc capacitor. It is based on a power electronics voltagesource converter and can act as either a source or sink of reactive ac power to an electricity network. Statcom operation is based on the principle of voltage source or current source converter 7. The linear operation range of the statcom can be extended if a regulation slope is allowed. Apr 25, 2018 statcom or static synchronous compensator is a power electronic device using force commutated devices like igbt, gto etc. Statcom functional model the principle of statcom operation is as follows. Strategies for reactive power control in wind farms with statcom. Pdf operation, modeling, control and applications of. In this situation, the statcom acts like an inductor. Mar 03, 2019 in this lecture i will teach you about statcom working principle, design and application.
It therefore helps increase reliability and availability of grid operation. This paper presents an algorithm to determine the rated capacity of statcom to improve the static volt age stability of a power system under normal and con tingency conditions. Terminal voltage v bus ac side is equal to sum of statcom output voltage and voltage drop across line reactor and resistance. The effectiveness of modeling for optimal placement and convergence is tested with a three bus study system without statcom device and further analyzed it with statcom. Static var compensation statcom technology is one of the advanced power electronics systems known as facts controllers, which provides fast and continuous capacitive and inductive reactive power supply to the power system. Statcom the voltagesourced converter vsc is the basic electronic. Investigation on dstatcom and dvr operation for voltage. It describes the basic operation of the statcom and its control method. Individual phase fullpower testing method for highpower. The basic objective of a vsc is to produce a sinusoidal ac voltage with minimal harmonic distortion from a dc voltage 16. The study of shunt connected facts devices is a connected field with the problem of reactive power compensation and better mitigation of transmission related problems in todays world. Operating principle of dstatcom the power electronic based three phase reactive power compensation equipment is the dstatcom, which generates and or absorbs the reactive power whose output can be varied so as to maintain control of specific parameters of the electric power system.
Depending on the power rating of the statcom, different technologies a re used for the power. Compensator phasor type block documentation, which describes the statcom principle of operation. In the statcom principle, the source v 1 is the power system voltage at the bus where the. Inductive output if vc principle of operation for a dstatcom is explained with the help of figure.
Statcom with active power compensation could be realized by adding an element which can inject and consume active power, i. Study and simulation of the svc and statcom effect on voltage. Benefits of svc and statcom for electric utility application s. Michael neutz, mv power converters, abb switzerland ltd. Statcom voltage regulation threephase vo i tag e balancing factors for stable power system operation. It provides the desired reactivepower generation and absorption entirely by means of electronic processing of the voltage and current waveforms in a vsc.
The statcom basically performs the same function as the static var compensators but with. Exploring power electronics simulation and chil testing with the rtds simulator duration. Statcom connected to the power system via coupling transformer. Statcom or static synchronous compensator is a power electronic device using force commutated devices like igbt, gto etc. Therefore the compensator current igrid flows in negative direction as per the definition in figure 8. Gto, igbt to control power flow and improve transient stability on electrical power networks. Operation of dstatcom in voltage control mode ijert. Statcom operates according to voltage source converter vsc principles, combining unique pwm pulse width modulation with millisecond switching. Power quality improvement in distribution network using d. In order to speedup simulation while keeping simulation fidelity, the switching function model is selected. Statcom technology for wind parks to meet grid code. In other words, if vi is bigger than vs, the reactive will besend to the statcom of the system capacitive operation, originating a current flow in thisdirection. Study of reactive power compensation using statcom ethesis.
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