Operation and Control of an Improved Performance Interactive DSTATCOM

Abstract

This paper proposes an improved performance interactive distribution static compensator (DSTATCOM) to address limitations of conventional current control mode (CCM) and voltage control mode (VCM) operations. The proposed interactive scheme provides smooth transfer of modes of operation while remaining connected in the distribution system. In normal operation, the DSTATCOM operates in CCM to make source currents balanced, sinusoidal, and at unity power factor. During voltage disturbances, the CCM operation cannot improve load voltage. In that case, DSTATCOM operation is changed to VCM which maintains a constant voltage across the sensitive loads. Hence, this interactive DSTATCOM ensures continuous, flexible, and robust operation of the load. Also, the filter current requirements are reduced in proposed scheme which reduces the losses in filter and feeder, improves inverter efficiency, and requires reduced rating inverter for sag mitigation. The principle of operation and control for both the operating mode are analyzed. The detailed process of the flexible transfer between the two modes is derived. Deadbeat predictive control algorithms for CCM as well as VCM operation are developed for fast operation during mode transfers. The performance of the proposed scheme is validated by both simulation and experimental results.

Angle measurement–based compensation methodology to mitigate voltage unbalance in a distribution system

“…Here, P loss is the active power loss in the compensator. In the present work, the reference current command for is generated by processing the DC‐link voltage error through PI controller unlike generating P loss from the error in DC‐link voltage . On the other hand, depends on the reactive power required by the load.…”

“…In the present work, the reference current command for i + id * is generated by processing the DC-link voltage error through PI controller 21,22 unlike generating P loss from the error in DC-link voltage. 4,[23][24][25][26] On the other hand, i − id depends on the reactive power required by the load. Hence, the reference command pertaining to i − id will be governed by the corresponding load current quantity (symbolized as i − ld ).…”

Performance evaluation of FPGA‐based predictive current controller for FL‐DSTATCOM in electric distribution system

“…The structure of FL‐DSTATCOM shown in Fig. 1 a allows independent control to each leg of the voltage source inverter (VSI) [23]. As predictive current control module needs the system model for predicting the behaviour, the one‐phase equivalent circuit of FL‐DSTATCOM for one leg is developed and shown in Fig.…”

A Highly Efficient Single-Phase Three-Level Neutral Point Clamped (NPC) Converter Based on Predictive Control with Reduced Number of Commutations

“…where λ c represents the weighting factor of the capacitor voltage balancing term in the cost function. Moreover, the future ac reference current can be expressed with past and present currents from a Lagrange extrapolation as [28][29][30][31]:…”