2015 IEEE Power & Energy Society General Meeting, 2015
Line-Commutated Converter (LCC) based HVDC lines are widely used to transmit electric power and i... more Line-Commutated Converter (LCC) based HVDC lines are widely used to transmit electric power and interconnect asynchronous AC systems. Due to the characteristic of LCC-based HVDC, large amount of reactive power consumed by HVDC potentially deteriorates system voltage stability. Reactive power control is crucial to alleviate adverse impacts of HVDC reactive power consumption from AC network and secure voltage stability of AC system. In this paper, a special reactive power control (RPC) approach is presented and implemented in EMS at system control center. Reactive power resources at HVDC converter substations are controlled collaboratively to satisfy the reliability criteria and voltage stability constraints. Numerical studies on Alberta power grid at different HVDC MW transfer levels have demonstrated that the RPC approach is effective in controlling reactive power to support the connected HVDC system. The net exchange of reactive power between the HVDC and the AC system can be minimized at levels close to neutral in most real-time operation conditions.
2021 IEEE Kansas Power and Energy Conference (KPEC)
An electronic circuit simulator-based approach is presented to improve the simulation speed for t... more An electronic circuit simulator-based approach is presented to improve the simulation speed for the power system transient analysis, where the modeling of SVC (Static Var Compensator) is investigated in a case study. The basic theory of circuit simulation including equation formulation and the numerical algorithm is introduced. Then, the circuit modeling of several power system components such as slack bus, constant power load, synchronous generator, and SVC are investigated respectively. Finally, numerical simulations are conducted on three IEEE test systems. Results demonstrate the applicability of the proposed simulation approach via electronic circuits.
2018 IEEE Power & Energy Society General Meeting (PESGM), 2018
HVDC lines are widely used to transmit electric power and interconnect asynchronous AC systems. T... more HVDC lines are widely used to transmit electric power and interconnect asynchronous AC systems. The Newton method conventionally is applied to solve HVDC power flow. Due to the non-linear characteristic of Newton method, power flow may have multiple solutions for converter transformer tap position and converter firing angle, result in path dependence and possible operation oscillation in power flow solution in special scenarios. In this paper, a linear solution method is proposed to solve HVDC to achieve a single solution for a given operation condition and thus resolve the issue of operation oscillation. Numerical studies on Manitoba Hydro power grid at different HVDC MW transfer levels have demonstrated that the Linear method outperformed the Newton method in computation efficiency and solution stability. A step improvement is also observed for cases operating near the regulating limit.
2020 IEEE Power & Energy Society General Meeting (PESGM)
This paper proposes a paralleled particle swarm optimization (PSO) algorithm based on MapReduce a... more This paper proposes a paralleled particle swarm optimization (PSO) algorithm based on MapReduce and graph computing mechanisms for real time Volt/Var optimization (VVO) application on large power distribution systems. As a nonlinear mixed integer programming problem, VVO is usually solved by artificial intelligent algorithms such as PSO. However, the PSO algorithm will suffer large computational burden when dealing with large systems. To achieve efficient solution for the VVO problem, the authors develop a paralleled PSO algorithm which can improve the computing speed dramatically. Moreover, this paper also proposes graph data model (GDM) for power distribution systems and apply graph computing to achieve fast power flow analysis for VVO application. The effectiveness of the proposed approach for VVO application has been validated on the IEEE 123 node test feeder considering unbalanced loading and line configurations. The computational efficiency of the proposed approach is also validated on various sizes of distribution systems.
The typical five-minute computational latency of current Energy Management Systems (EMSs) can lea... more The typical five-minute computational latency of current Energy Management Systems (EMSs) can leave and has left system operators blind to the system state created by events that lead to cascading outages, system separation and/or system collapse. In this paper, we present a graph-computing based EMS that allows the EMS computational cycle time to be reduced to the SCADA sampling cycle, about five seconds. This is achieved in part by taking advantage of both nodal and hierarchical parallelism, to achieve high-speed graph-based state estimation, power flow, and contingency analysis applications. A production-mode case study on an existing large-scale system verifies the advantages and performance of graph computing, demonstrating that the graph-based EMS is more than 20 times faster than a contemporary commercial EMS.
2015 IEEE Power & Energy Society General Meeting, 2015
Line-Commutated Converter (LCC) based HVDC lines are widely used to transmit electric power and i... more Line-Commutated Converter (LCC) based HVDC lines are widely used to transmit electric power and interconnect asynchronous AC systems. Due to the characteristic of LCC-based HVDC, large amount of reactive power consumed by HVDC potentially deteriorates system voltage stability. Reactive power control is crucial to alleviate adverse impacts of HVDC reactive power consumption from AC network and secure voltage stability of AC system. In this paper, a special reactive power control (RPC) approach is presented and implemented in EMS at system control center. Reactive power resources at HVDC converter substations are controlled collaboratively to satisfy the reliability criteria and voltage stability constraints. Numerical studies on Alberta power grid at different HVDC MW transfer levels have demonstrated that the RPC approach is effective in controlling reactive power to support the connected HVDC system. The net exchange of reactive power between the HVDC and the AC system can be minimized at levels close to neutral in most real-time operation conditions.
2021 IEEE Kansas Power and Energy Conference (KPEC)
An electronic circuit simulator-based approach is presented to improve the simulation speed for t... more An electronic circuit simulator-based approach is presented to improve the simulation speed for the power system transient analysis, where the modeling of SVC (Static Var Compensator) is investigated in a case study. The basic theory of circuit simulation including equation formulation and the numerical algorithm is introduced. Then, the circuit modeling of several power system components such as slack bus, constant power load, synchronous generator, and SVC are investigated respectively. Finally, numerical simulations are conducted on three IEEE test systems. Results demonstrate the applicability of the proposed simulation approach via electronic circuits.
2018 IEEE Power & Energy Society General Meeting (PESGM), 2018
HVDC lines are widely used to transmit electric power and interconnect asynchronous AC systems. T... more HVDC lines are widely used to transmit electric power and interconnect asynchronous AC systems. The Newton method conventionally is applied to solve HVDC power flow. Due to the non-linear characteristic of Newton method, power flow may have multiple solutions for converter transformer tap position and converter firing angle, result in path dependence and possible operation oscillation in power flow solution in special scenarios. In this paper, a linear solution method is proposed to solve HVDC to achieve a single solution for a given operation condition and thus resolve the issue of operation oscillation. Numerical studies on Manitoba Hydro power grid at different HVDC MW transfer levels have demonstrated that the Linear method outperformed the Newton method in computation efficiency and solution stability. A step improvement is also observed for cases operating near the regulating limit.
2020 IEEE Power & Energy Society General Meeting (PESGM)
This paper proposes a paralleled particle swarm optimization (PSO) algorithm based on MapReduce a... more This paper proposes a paralleled particle swarm optimization (PSO) algorithm based on MapReduce and graph computing mechanisms for real time Volt/Var optimization (VVO) application on large power distribution systems. As a nonlinear mixed integer programming problem, VVO is usually solved by artificial intelligent algorithms such as PSO. However, the PSO algorithm will suffer large computational burden when dealing with large systems. To achieve efficient solution for the VVO problem, the authors develop a paralleled PSO algorithm which can improve the computing speed dramatically. Moreover, this paper also proposes graph data model (GDM) for power distribution systems and apply graph computing to achieve fast power flow analysis for VVO application. The effectiveness of the proposed approach for VVO application has been validated on the IEEE 123 node test feeder considering unbalanced loading and line configurations. The computational efficiency of the proposed approach is also validated on various sizes of distribution systems.
The typical five-minute computational latency of current Energy Management Systems (EMSs) can lea... more The typical five-minute computational latency of current Energy Management Systems (EMSs) can leave and has left system operators blind to the system state created by events that lead to cascading outages, system separation and/or system collapse. In this paper, we present a graph-computing based EMS that allows the EMS computational cycle time to be reduced to the SCADA sampling cycle, about five seconds. This is achieved in part by taking advantage of both nodal and hierarchical parallelism, to achieve high-speed graph-based state estimation, power flow, and contingency analysis applications. A production-mode case study on an existing large-scale system verifies the advantages and performance of graph computing, demonstrating that the graph-based EMS is more than 20 times faster than a contemporary commercial EMS.
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