Improved ADC Model of Voltage-Source Converters in DC Grids

Qin, Mu; Liang, Jun; Zhou, Xiaoxin; Li, Yalou; Zhang, Xing

doi:10.1109/tpel.2014.2301197

Cited by 33 publications

(7 citation statements)

References 25 publications

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“…However, ADC is prone to fictitious oscillations that can alter the behavior of the converter's model. Various techniques have been proposed for minimizing the effect of these undesired oscillations [22][23][24]. These techniques often require a special routing mechanism in the HS to handle the various conditions the modified algorithm has to account for.…”

Section: Switch Modelmentioning

confidence: 99%

A Latency-Insensitive Design Approach to Programmable FPGA-Based Real-Time Simulators

2020

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This paper presents a methodology for the design of field-programmable gate array (FPGA)-based real-time simulators (RTSs) for power electronic circuits (PECs). The programmability of the simulator results from the use of an efficient and scalable overlay architecture (OA). The proposed OA relies on a latency-insensitive design (LID) paradigm. LID consists of connecting small processing units that automatically synchronize and exchange data when appropriate. The use of such data-driven architecture aims to ease the design process while achieving a higher computational efficiency. The benefits of the proposed approach is evaluated by assessing the performance of the proposed solver in the simulation of a two-stage AC–AC power converter. The minimum achievable time-step and FPGA resource consumption for a wide range of power converter sizes is also evaluated. The proposed overlays are parametrizable in size, they are cost-effective, they provide sub-microsecond time-steps, and they offer a high computational performance with a reported peak performance of 300 GFLOPS.

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Section: Switch Modelmentioning

confidence: 99%

A Latency-Insensitive Design Approach to Programmable FPGA-Based Real-Time Simulators

2020

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“…Unlike R on /R off model, the associated discrete circuit (ADC) model [9] of power electronic switch uses the L/C model with equal admittance to represent switches so that frequent reformations of the system admittance matrix after switching actions can be avoided [10]. With less computation and high simulation efficiency, the ADC model is widely adopted and especially has become the main choice in commercial real-time simulators, such as RTDS [11], RT-LAB [12], ADPSS [13] etc. However, the above ADC model has two main limitations.…”

Section: Introductionmentioning

confidence: 99%

“…Second, this model can only be adopted with small time-step (usually less than 2 μs) to guarantee the simulation accuracy [16,17], which increases the computational burden in unit time. Some works have been done to solve the first limitation, including setting optimal L/C model parameters [18,19], using generalized associated discrete circuit (G-ADC) model to guarantee the switch model best-damping characteristics [20], or applying the initialization techniques to optimize the initial state after switching actions [13,20,21]. All these works are helpful to reduce virtual power loss but not suitable for simulation with larger time-step.…”

Section: Introductionmentioning

confidence: 99%

A fractional time‐step simulation method suitable for the associated discrete circuit model of power electronic system

Wang

et al. 2022

IET Renewable Power Gen

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The associated discrete circuit (ADC) model for switches is widely used in electromagnetic transient simulation of power electronic system. When using ADC model, the problem of virtual power loss caused by L/C switching cannot be ignored and small time-step (≤2 μs) is usually required to guarantee accuracy, both of which will limit the application of ADC model. To cope with this, a fractional time-step simulation method (FTSSM) suitable for the ADC model of power electronic system is proposed. The method is derived from the compact form of electro-magnetic transient program (EMTP) algorithm, and the simulation iteration is implemented by small-step synthesis calculation with different fractional time-steps, which are designed to locate the accurate switching actions. In this way, the simulation can be conducted under larger time-step (to tens of μs) while the accuracy is still acceptable. Further analysis on time domain error and numerical stability of the FTSSM are discussed. Simulations of grid-connected inverter system and permanent magnet synchronous motor (PMSM) driving system are done, using FTSSM and on PSCAD respectively for comparison. The results verify the accuracy of proposed FTSSM, and indicate that the FTSSM is helpful to accelerate the offline simulation and improve the real-time simulation performance.

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“…If there are lots of nonlinear elements in a system, such as the MMC, the execution rate can be extremely low; therefore, making this approach impractical. There are some efforts to make the switch model equal for both ON and OFF states [19]- [20] so as to make the admittance matrix constant. However, such methods either induce inaccurate power losses or require complicated revising calculations, and cannot be promoted to model other nonlinearities.…”

Section: Introductionmentioning

confidence: 99%

A Fast and Stable Method for Modeling Generalized Nonlinearities in Power Electronic Circuit Simulation and Its Real-Time Implementation

Huang

Dinavahi

2019

IEEE Trans. Power Electron.

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Nonlinearities have been the major obstructions that limit the computational efficiency in power electronic circuit simulation for a long time. Yet there is no standard way for dealing with them. This paper presents a new method that makes the handling of nonlinearities fast and stable. In the proposed method, nonlinearities are transformed into a uniform representation-a constant resistor in parallel with a companion current source, thus making the system admittance matrix constant for fixed time-step simulation. To solve for the corresponding companion current source, nonlinearities are treated as either current or voltage sources and a diagonal time-varying matrix equation is developed. Three methods are proposed for solving the matrix equation-precomputed inversion or factorization, modified Gaussian elimination, and updating inverse using the Sherman-Morrison formula-that can fit different system sizes and applications. The proposed method is validated by two common power electronic converter topologies, both in offline and real-time simulation. Offline tests show that the proposed method achieved the same accuracy with the mature simulation software while being more than ten times faster. The same test cases are also implemented into field programmable gate arrays based real-time simulation experiments for verification.

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Improved ADC Model of Voltage-Source Converters in DC Grids

Cited by 33 publications

References 25 publications

A Latency-Insensitive Design Approach to Programmable FPGA-Based Real-Time Simulators

A Latency-Insensitive Design Approach to Programmable FPGA-Based Real-Time Simulators

A fractional time‐step simulation method suitable for the associated discrete circuit model of power electronic system

A Fast and Stable Method for Modeling Generalized Nonlinearities in Power Electronic Circuit Simulation and Its Real-Time Implementation

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