A Static VAr Compensator (or SVC) is an electrical device for providing fast-acting reactive power on high-voltage electricity transmission networks. SVCs are part of the Flexible AC transmission system device family (FACTS), regulating voltage and stabilizing the system.
We provide a complete turnkey delivery of the project including civil works. Furthermore, we can also provide consultancy support for the assessment of the SVC specification.
Due to increase of wind energy, the Transmission System Operators (TSO) put grid code requirements on the wind parks to ensure grid stability such as reactive power control and ride-through capability. A centrally placed SVC at the Point of Common Coupling (PCC) can be used to solve these issues in wind farms and have the following benefits:
An inverter transforms direct current (DC) into alternating current (AC), in this case, at a constant frequency.
Input source (DC)
The DC input can come from solar panels, rectifiers – chargers, batteries, DC bars, etc. The voltage is usually variable because the power sources operate in highly volatile situations. For that reason, the Jemainverter is designed to accept a wide margin of variation in input voltage while maintaining the desired output parameters.
The inverters work on-line and usually include a static transfer by-pass to an auxiliary support grid for emergencies and a manual by-pass for maintenance work.
The device has excellent dynamic behaviour with IGBT transistors. It’s controlled by a microprocessor that governs the unit in response to different keywords and signals it receives and informs the user of its status. If it includes a by-pass, it synchronises with the auxiliary grid. Control functions:
General features of the device
All the features above can be modified on demand.
Static frequency converters are used to feed loads that require AC power at a fixed frequency different from what is available from the grid. Using an intermediate DC transformation, the device can deliver that power under the required conditions.
Subsequently, one unit consists of 2 sub-subsystems:
Batteries can optionally be added to the system so it can be autonomous in the event of a grid failure.
The device has excellent dynamic behaviour with IGBT transistors. It’s controlled by a microprocessor that governs the unit in response to different keywords and signals it receives and informs the user of its status.
General features of the device
A UPS ensures AC electrical supply to the loads it serves by using batteries. In addition, it filters disruptions, harmonics, voltage spikes etc. that may appear in the grid. Those features are demanded by critical or vital loads that require high quality trustworthy power.
A UPS is made up of 4 sub-systems:
The device has excellent dynamic behaviour with IGBT transistors. It’s controlled by a microprocessor that governs the device in response to different keywords and signals it receives and informs the user of its status.
Can optionally operate in parallel with other units
A rectifier transforms alternating current (AC) into direct current (DC). Its normal function is charging batteries and keeping them in optimum conditions while, at the same time, providing DC power for other loads. Consequently, it’s essential that the unit takes into account what kind of batteries it’s feeding (Pb or NiCd) when operating.
It works automatically and continuously evaluates the status and temperature of the batteries and other system parameters in order to guarantee stable voltage and low ripple.
It can incorporate load disconnection manoeuvres for the end of autonomy, thermal-magnetic distribution, fault localisation, grid analysers, etc.
Battery charge limits and levels
With sealed Pb batteries, only two current levels are used (float and charge), while three are used for open Pb and NiCd batteries: float, fast charge and deep charge.
Shift from float to fast charge and vice-versa:
Entrada: Monofásica 220 VAC, + 15%, – 20% – Trifásica 220 / 380 / 400 VAC, + 15%, – 20% – Frecuencia 50 / 60 Hz, ± 5% – Factor de potencia hasta 0,9
Salida: 24 / 48 / 110 / 125 / 220 VDC, ± 0,5% – De 10 a 10.000 A – Rizado hasta 0,1% r.m.s. – Rendimiento hasta 94%, según potencia
Opciones: Baterías de Pb ó NiCd – 6 ó 12 pulsos – Filtro anti armónicos – Redundante – Operación en paralelo con otras unidades – Antisísmico Clase 1E – Cuadros de distribución de salida – Cuadros de maniobra – Detector de faltas a tierra – Localizador de faltas a tierra – Analizador de redes – Adaptación a normativas diversas (MIL, UL, …)
Diseño: Armario metálico autoportante – Protección IP20 a IP54 – Color RAL 7032 (típico)
Todas las características anteriores pueden adaptarse bajo demanda.
Jema provides a complete range of STATCOMs from 1 Mvar to 40 Mvar (increasable using parallel devices), for integration in renewable plant grids.
JEMA Energy SA
Paseo del Circuito 10
20160 Lasarte-Oria · Gipuzkoa · España
Tel. +34 943 376 400
Fax +34 943 371 279