Transient Stability Considering Dynamic Load in Bulk Power System with High DG Penetration

SUMMARY Because of energy and environmental policies in the last decade, a lot of photovoltaic (PV) generations have been installed into power systems in Japan in recent years. In this situation, it is of great concern that disconnection of PV due to voltage drop caused by a system fault has a critical impact on power system stability. To avoid its disconnection, Fault Ride Through (FRT) requirement is applied for PVs. In this paper, PV power output control which improves transient stability of the power system with a huge amount of PVs is proposed and its effectiveness is confirmed by the numerical simulations.

“…Here, we use P-δ curves of one-machine one-load infinite bus model to evaluate the effects of IM rate and PV output on transient stability [9][10][11].…”

Section: Evaluation Of Transient Stability Using Pcurvementioning

confidence: 99%

PV Power Output Control Improving Transient Stability of Power System with a Large Penetration of PV

Mitsugi

Yokoyama

Yamada

et al. 2016

“…In transient stability analysis of a power system, it is necessary to express loads by a dynamic load model with constant-impedance load and induction motor load connected in parallel [3]. Such a dynamic model is adopted in this paper.…”

Section: Load Modelmentioning

confidence: 99%

“…Previous research on PV interconnection in terms of transient stability analysis shows that results are affected by PV and load models used in simulations as well as operating conditions of synchronous generators and other factors [3][4][5][6]. However, load and PV modeling are not always adequate, and step-out conditions are not always clear.…”

Section: Introductionmentioning

confidence: 99%

Impact of Postfault Active Power Recovery of Photovoltaic Power Generation on Transient Stability

Kawabe

Matsuda

Tanaka

2016

Currently, Japanese grid codes require photovoltaic (PV) power generation systems to continue supplying power to the grid as soon as possible even if the systems temporarily stop their operation. Although the fault ridethrough capability was originally proposed for preventing a cascading frequency drop in the power system, the capability has the impact on other instability phenomena such as transient stability. In this study, we focus on the postfault active power recovery of the PV systems. The impact of the recovery speed on the transient stability is investigated under different load conditions, in particular static/dynamic load condition. Numerical examples are carried out for the one-machine one-load infinite-bus system, and the effects of the recovery speed are evaluated by equal area criterion and critical clearing time. As a result, we have found both desirable and undesirable effects on the transient stability depending on the load condition. C⃝ 2016 Wiley Periodicals, Inc. Electr Eng Jpn, 198(4): 26-36, 2017; Published online in Wiley Online Library (wileyonlinelibrary.com).

“…(3), which has been presented in prior papers [3][4][5]. Here, W represents the rated output (kW): (2) Figure 5 shows the DG control method used in practice in this paper, with reference to Eqs.…”

Section: Overview Of the Devicementioning

confidence: 99%

“…Given this situation, as the introduction of distributed generators (DG) advances, the shortterm voltage stability [1][2][3] of the load may worsen, and the effects on the upper voltage level of the grid cannot be ignored. We have previously shown that instability of the short-term voltage in the load [3] and generator desynchronization [4,5] may occur as a result of voltage sag caused by grid faults. We have also shown through simulations that if dynamic voltage support (DVS) equipment in which a DG maintains the voltage dynamically is set up as a countermeasure, these instabilities can be corrected.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of DG's dynamic voltage support capability improving short‐term voltage stability on power system loads

Ueda

Komami

2010

Self Cite

SUMMARYHigh DG penetration will seriously degrade the short-term voltage stability of the load in bulk power systems. Simulation results in previous studies by the authors have shown that the dynamic voltage support (DVS) capability of a DG improves stability, but experimental evaluation does not yet exist. This paper presents the effects of the DVS capability of a DG on an experimental circuit consisting of an induction motor, a resistance load, and a compensation capacitor behind a reactance. First, an experimental setup that causes voltage instability without DVS is set up. Second, an improvement in DG inverter control is made in order to achieve a low-voltage ridethrough (LVRT) capability and DVS capability, and the DG's performance is confirmed by voltage sag tests. Finally, the tests on the experimental setup demonstrate that the DVS capability greatly improves the short-term voltage stability of power system loads, and the experimental results agree well with the simulation results.