Abstract
The responses of an inverter-based distributed generator (IBDG) to abnormal voltage and frequency are different from those of a conventional generator owing to the difference in the operating modes. In particular, the momentary cessation (MC) mode deteriorates the transient stability of normal power systems by ceasing to provide active and reactive power to the grid. However, in a high-generation area, where a significant amount of generation is concentrated and where transient instability exists under a contingency, MC operation is conducive to the transient stability because the electrical output of critical generators increases to cover the local loads under this condition. This effect can cause frequency instability if a sizeable portion of the IBDG output is lost owing to the operating modes. To ensure transient and frequency stability, this study analyzed the effects of operating modes and generator tripping on the high-generation area. A method for determining the capacity limit of the IBDGs in the high-generation area was then developed to ensure power system stability. The effectiveness and feasibility of the proposed method were verified by conducting a case study on the Korean power system.
Highlights
Renewable energy generators are increasingly preferred over coal-fired power plants owing to environmental concerns such as the rising levels of greenhouse gases and pollution
This study analyzed the effects of critical generator tripping and operating modes of inverter-based distributed generator (IBDG) on the transient and frequency stability of a power system in a high-generation area
The momentary cessation (MC) capability negatively affected the transient stability, whereas the MC of the IBDGs located in the high-generation area was found to have a positive effect, similar to the case of critical generator tripping by special protection schemes (SPSs)
Summary
Renewable energy generators are increasingly preferred over coal-fired power plants owing to environmental concerns such as the rising levels of greenhouse gases and pollution. The influence of variable generation of a PV system on the frequency stability was analyzed by long-term dynamic simulations [11] None of these studies considered the effect of inverter operating modes on the power system stability. The remainder of this paper is organized as follows: Section II investigates the effects of generator tripping and MC of IBDGs on the transient stability of the power system in the high-generation area using the single-machine equivalent (SIME) method, as described in [25]–[29]. If Aacc is greater than Adec, the system will be unstable; otherwise, the system can return to a stable condition after the contingency
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