Dynamic Voltage Stability Improvement using coordinated control of dynamic VAR-sources

Abstract

Fast voltage collapse is a new phenomenon in today's stressed power system. To prevent fast voltage collapse sufficient amount of compensation from dynamic reactive sources such as generator, condenser, SVC and STATCOM are needed. This paper presents a new controller (called Power System Voltage Stabilizer or PSVS) for dynamic voltage stability enhancement of power systems and/or prevention of fast voltage collapse. The PSVS is implemented through coordinated control of dynamic reactive sources. For implementation of a PSVS, the given power system is first divided into several small Voltage Control Areas (VCAs) each of which include several loads and several dynamic reactive sources. Then for each VCA, a Dynamic Voltage Stability Index (DSVI) is defined that includes the voltage deviations of all load buses within the area. Finally, a coordinated control of all dynamic reactive sources of the area is used to improve the dynamic voltage index during voltage emergencies. The proposed method is applied for a modified IEEE 14-bus system and tested for severe voltage emergency. The simulation results obtained from PSS/E software package indicate significant improvement in dynamic voltage stability of the system. KEY WORDSDynamic voltage stability, dynamic voltage control, dynamic reactive sources, fast voltage collapse, and power system voltage stabilizer

DC Powering Solutions for the Future Circular Collider: Converter Topologies, Protection, and Control

“…Thus, it is important to ensure that the FCC does not interfere with the power flows established by network authorities and prevent uncontrolled power flows from being established through the FCC infrastructure. In this regard, the AC/DC converters can enhance network stability by precisely controlling the power flows [6] and injecting reactive power [7] into the connection nodes, thereby mitigating potential perturbations caused by the operation of the machine. Additionally, an HVDC network can compensate voltage dips coming from the network [8].…”

Multiple Dispatching Reactive Power and Voltage Coordinated Control Method

“…It not only affects the life of the equipment, but also can not ensure the quality of the voltage. Therefore, it need coordinated control of reactive power and voltage through the exchange of information between different dispatching control centers and different power grid at all levels, to ensure the whole grid voltage and reactive power integrated operation, to achieve optimal distribution of voltage and reactive power, to meet the requests of bus voltage qualified, the gateway power factor reasonable, power grid loss minimum and so on [1][2][3][4][5][6].…”

Coordinated agent-based control for online voltage instability prevention

“…This measure can be determined based on local measurements. The generator can be used for reactive power supply as well [20].Several attempts to coordinate the different countermeasures are reported in [16,[21][22][23][24]. For the local generation, the control of two types is described: for micro Combined Heat and Power (micro-CHP) units and for large synchronous generators.…”

“…From the generators, virtual load reduction in the problematic area can be obtained by increasing the active power output [19]. The generator can be used for reactive power supply as well [20].Several attempts to coordinate the different countermeasures are reported in [16,[21][22][23][24]. For most methods, a cost function is optimized to determine the optimal control strategy [21][22][23][24].…”

“…From the generators, virtual load reduction in the problematic area can be obtained by increasing the active power output [19]. The generator can be used for reactive power supply as well [20].…”