Reactive power characteristics and vibration properties under SISC in synchronous condensers

2021 ◽  
Vol 133 ◽  
pp. 107318
Author(s):  
Mengyao Jiang ◽  
Hongzhong Ma ◽  
Yuliang Zhang ◽  
Xuan Chen ◽  
Xuehua Zhao
Keyword(s):  
Reactive Power ◽  
Power Characteristics ◽  
Vibration Properties ◽  
Synchronous Condensers

scholarly journals Investigating the impacts of the SVCs and the SCs affecting to the transient stability in multi-machine power system

2016 ◽  
Vol 19 (2) ◽  
pp. 16-24
Author(s):  
Quang Huu Vinh Luu
Keyword(s):  
Power System ◽  
Transient Stability ◽  
Reactive Power ◽  
Voltage Regulation ◽  
State Variables ◽  
Static Var Compensators ◽  
Transient Energy ◽  
Voltage Frequency ◽  
Power Outputs ◽  
Synchronous Condensers

A new algorithm simulating the impacts of the VAR supporting devices such as the static var compensators (SVCs) and the synchronous condensers (SCs) under condition of symmetrical disturbances in multi-machine power system is mentioned. Some typical numerical examples are presented in this article. The comparisons of variation of the state parameters, such as the voltage, frequency, reactive power outputs and asynchronous torques…are simulated under condition of the action of the automatic voltage regulation systems of generators and of the VAR supporting devices. The transient energy margins are calculated and compared to assess the transient stability in multi-machine power system. Basing on this algorithm, the PC program uses the elements of the eigen-image matrix to bring the specific advantages for the simulation of the transient features of state variables.

Power Control of Photovoltaic Inverter under Unbalanced Grid Faults Considering Limits of Its Current Harmonics

2014 ◽  
Vol 960-961 ◽  
pp. 1356-1360 ◽  
Author(s):  
Yu Zhou ◽  
Zhi Yong Dai ◽  
Qiang Gang Wang ◽  
Ling Ye ◽  
Nian Cheng Zhou
Keyword(s):  
Power Control ◽  
Control Strategy ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Optimal Parameters ◽  
Current Harmonics ◽  
Power Characteristics ◽  
Active And Reactive Power ◽  
Fluctuation Amplitude ◽  
Unbalanced Grid

This paper studies the instantaneous output power characteristics of photovoltaic inverters and its flexible power control strategy under unbalanced grid faults. Then the optimal parameters model of the power control is established with minimum integrated fluctuation amplitude of the active and reactive power as a goal when the constraint of the output current harmonic distortion of photovoltaic inverters is taken into account. Finally, the optimal power control of photovoltaic inverters based on dead-beat current tracking is realized and the feasibility of the proposed control strategy is verified with the power system transient software PSCAD/EMTDC.

scholarly journals Transient reactive power characteristics of HVDC during commutation failure and impact of HVDC control parameters

2017 ◽  
Vol 2017 (13) ◽  
pp. 1134-1139 ◽  
Author(s):  
Jingzhe Tu ◽  
Yan Pan ◽  
Jian Zhang ◽  
Bing Zeng ◽  
Junchuan Jia ◽  
...  
Keyword(s):  
Reactive Power ◽  
Control Parameters ◽  
Power Characteristics ◽  
Commutation Failure

scholarly journals Influence of Synchronous Condensers on Operation Characteristics of Double-Infeed LCC-HVDCs

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1704
Author(s):  
Xu Luo ◽  
Fan Li ◽  
Li Fan ◽  
Tao Niu ◽  
Bo Li ◽  
...  
Keyword(s):  
Reactive Power ◽  
Reserve Capacity ◽  
Security Level ◽  
Voltage Waveform ◽  
Theoretical Derivation ◽  
Voltage Security ◽  
Electromagnetic Transient Simulation ◽  
Security Region ◽  
Synchronous Condensers ◽  
Operation Characteristics

Considering the advantages that dynamic reactive power (var) equipment (such as synchronous condensers (SCs), which can control var independently and improve voltage stability), SCs are widely used in AC/DC hybrid power grid to provide emergency var and voltage support. In order to evaluate the dynamic var reserve capacity of SCs and analyze the influence of SCs on the operation characteristics of power system, a model with double-infeed line-commutated converter-based high-voltage direct currents (LCC-HVDCs) and SCs is established. Through theoretical derivation and PSCAD/EMTDC simulation, the effects of SCs on the operation characteristics of double-infeed LCC-HVDCs networks are studied. Then, the non-smooth voltage waveform of electromagnetic transient simulation is approximately transformed into smooth waveform by data fitting method. Finally, the processed voltage waveform is searched step by step to explore the boundary of voltage safety region to determine the dynamic var reserve capacity of SCs. The numerical results show that SCs can enlarge the voltage security region of the direct current (DC) subsystem, thus effectively improving the steady-state and transient security level of the double-infeed LCC-HVDCs networks.

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