Lesnanto Multa Putranto - Academia.edu (original) (raw)

Papers by Lesnanto Multa Putranto

IJITEE (International Journal of Information Technology and Electrical Engineering), 2021

Limited battery power is a major challenge for wireless sensor network (WSN) in internet of thing... more Limited battery power is a major challenge for wireless sensor network (WSN) in internet of things (IoT) applications, especially in hard-to-reach places that require periodic battery replacement. The energy harvesting application is intended as an alternative to maintain network lifetime by utilizing environmental energy. The proposed method utilized piezoelectricity to convert vibration or pressure energy into electrical energy through a modular piezoelectric energy harvesting design used to supply energy to sensor nodes in WSN. The module design consisted of several piezoelectric elements, of which each had a different character in generating energy. A bridge diode was connected to each element to reduce the feedback effect of other elements when pressure was exerted. The energy produced by the piezoelectric is an impulse so that the capacitor was used to quickly store the energy. The proposed module produced 7.436 μJ for each step and 297.4 μJ of total energy with pressure of a ...

2021 13th IEEE PES Asia Pacific Power & Energy Engineering Conference (APPEEC)

2020 International Conference on Sustainable Energy Engineering and Application (ICSEEA)

The Total distribution system losses of PT PLN ULP Purworejo reach 10.467%as technical and non-te... more The Total distribution system losses of PT PLN ULP Purworejo reach 10.467%as technical and non-technical losses which were very high compare to the maximum limit (5%). In this research, Photovoltaics (PV) Distributed Generation (DG) was installed as an active power injection to reduce the system’s losses. This research determined the hosting capacity of PV including the location and capacity of the PV. The problem was modeled into an optimization problem and was simulated using Particle Swarm Optimization (PSO) algorithm in MATLAB environment. The simulation was considered the voltage, power factor (pf), and branch current as constraints. The simulation was conducted on the existing system of Feeder 7 of PT PLN ULP Purworejo distribution system. Backward Forward Sweep (BFS) method was used for load flow analysis. As the load flow analysis result, the technical losses on a feeder 7 reach 2.676% of feeder 7 supply. The simulation results showed that by installing optimal distributed PV, the technical losses in feeder 7 were reduced to 1.351%. The overall losses of PT PLN ULP Purworejo become 10.045%.

2019 International Conference on Information and Communications Technology (ICOIACT)

Distributed Generation (DG) installation in the distribution system aimed to reduce power losses,... more Distributed Generation (DG) installation in the distribution system aimed to reduce power losses, increase the voltage profile, and increase the amount of power supplied. One DG that can be implemented is based on photovoltaic (PV). The stochastic PV characteristics will cause ups and downs of the power produced. When the power generated is greater than the load downstream, it will potentially cause the power flow to be two-way. The method for determining the placement location and optimal DG capacity is needed so that the effect of PV penetration on changes in power flow and voltage profile is still within the permissible limits.This study proposed the FPA algorithm to determine the optimal location and DG capacity to reduce power losses in the distribution system with a case study of distribution network in Semanu Substation, Gunung Kidul Yogyakarta. The findings confirmed that the FPA method can be used to determine the placement location and optimal DG capacity of 9.501 MW, with active power losses after DG having decreased by 68.75%, and reactive power losses of 61.40%.

2020 International Conference on Sustainable Energy Engineering and Application (ICSEEA)

Along with the rising demand for electrical energy, and also considering government policies to i... more Along with the rising demand for electrical energy, and also considering government policies to increase renewable energy mix in the primary energy sources, a new renewable energy generating unit is needed. PV farm integration as distributed generation (DG) can be used as the solution to both problems. PV installations are considered a suitable solution since it used renewable energy. However, misplacement or unsuitable capacity of PV installations in the distribution systems can possibly worsen the system quality, thus optimization is needed to ensure that the goal is achieved by also improve the system quality. This paper presents the optimization of the location and sizing of PV farm using Particle Swarm Optimization (PSO) in order to reduce losses and voltage drop as well as increasing the overall system reliability. The results indicate that the PV installations with the optimized locations and sizes can reduce the losses and voltage drop and increase the system reliability.

2018 4th International Conference on Science and Technology (ICST)

Short-term load forecasting (STLF) is a very important factor in the planning and operation of po... more Short-term load forecasting (STLF) is a very important factor in the planning and operation of power systems. The purpose of load forecasting is to balance the demand and electricity supply. The electrical load is dynamic, changing over the time. The provision of electrical energy is also dynamic following the pattern of load changes. Load forecasting is required to ensure an accurate decision on power plant scheduling, unit commitment, and power delivery. This paper presents a recurrent neural network (RNN) model with Levenberg-Marquardt and Bayesian regularization training algorithms used for short-term electrical load forecasting. The accuracy criterion used is Mean Absolute Percentage of Error (MAPE). The results show that the RNN model can make good predictions. RNN model with the Bayesian regularization training algorithm has better accuracy. Its average MAPE in one week is 1,4792%. It implies that the RNN model is great tool for STLF.

2020 3rd International Seminar on Research of Information Technology and Intelligent Systems (ISRITI)

Sulawesi's electricity system needs to maintain the sustainability of the electricity supply ... more Sulawesi's electricity system needs to maintain the sustainability of the electricity supply which is stable, reliable, safe, eco-friendly, and able to meet the needs of the community. For that reason, the transmission expansion-planning program 2018-2050 is proposed. Considering the load growth, primary energy, and the power flow, it is necessary to build the transmission backbone, which for Indonesian case maybe 275 kV or 500 kV. The determination of the backbone's voltage requires some criteria, one of them is to performing contingency analysis which can be obtained by performance index analysis. Performance index analysis, consist of voltage performance index and active power performance index, is simulated using the DIg-SILENT PowerFactory 15.1.7 software for two generation planning scenarios, regional balanced and resourced based. If the transmission system has exceeded the level of set severity of the contingency case, it is necessary to choose the 500 kV Extra High Voltage Overhead Transmission Line.

2019 International Conference on Technologies and Policies in Electric Power & Energy

Demand response (DR), a program motivates consumers to change their load in a period. The respons... more Demand response (DR), a program motivates consumers to change their load in a period. The response load demand is being a problem in unit commitment (UC). However, UC is related to fulfilling load demand and minimizing the total operation cost of the generating unit without violation of the system and unit constraints. The UC and DR problems are solved using Mixed-Integer Quadratic Programming (MIQP). Load shifting affected by the application of DR is going to affect the percentage of load factor. The higher percentage of load factor has a potential benefit for the utility. The performance of the proposed method is tested using the standard IEEE 10-unit test system. The simulation result shows that the proposed method is capable of increasing 5% load factor with DR. The simulation result also show that the proposed method is capable of reducing at 0.59% of the total generation cost.

2020 International Conference on Technology and Policy in Energy and Electric Power (ICT-PEP)

HVDC can be considered a mature technology and has been installed in several countries for differ... more HVDC can be considered a mature technology and has been installed in several countries for different purposes other than transmitting power. The shift from a conventional and centralized electric power plant to a distributed variable renewable energy (VRE) generator has placed HVDC in a significant role to ensure the stability of the grid. This is not only because HVDC has a larger rating than the VRE generator, but also HVDC can be controlled to mimic the operation of the synchronous generator. In this paper, the role of HVDC in supporting the transient stability of a low inertia AC system is explained. The converter can be operated as the grid following/supporting or grid forming mode, depending on how strong the AC grid is. Furthermore, the challenge of implementing these modes is also identified.

2019 International Conference on Electrical Engineering and Informatics (ICEEI)

Negative impacts of large-scale rooftop photovoltaic (PV) penetration may cause performance deter... more Negative impacts of large-scale rooftop photovoltaic (PV) penetration may cause performance deterioration of distribution grids. Consequently, a rooftop PV hosting capacity analysis is becoming a concern of utility. In this work, a proposed method based on Monte Carlo process is developed to assess the PV hosting capacities on the basis of substation power factor. To consider the actual conditions, three selected feeders including feeder F1, feeder F2, and feeder F3, with distinct grid characteristics from Yogyakarta Province of Indonesia are employed. To obtain a detailed result of the rooftop PV hosting capacity, the customer with rooftop PV is randomly selected one by one. The proposed method is performed with over/undervoltage, substation power factor and reverse power flow limit. The comparative study is provided to investigate the impacts of the operational limits on the rooftop PV hosting capacity. Since the load demand and PV output vary with the time, the analyses are conducted in a time-series framework. In this work, constant PQ of loads is assigned, and all rooftop PV systems are assumed to have unity power factor. The results show that the substation power factor limit is more restrictive compared to overvoltage limit and reverse power flow limit. The substation power factor limits the rooftop PV penetration on feeder F1, feeder F2, and feeder F3, respectively, 86.52%, 79.37%, and 85.85% faster than reverse power flow limit. The results also indicate that the substation power factor decreases with the increasing of rooftop PV penetration.

2018 5th International Conference on Information Technology, Computer, and Electrical Engineering (ICITACEE)

The development of power generation technology enables the location of the plant which is no long... more The development of power generation technology enables the location of the plant which is no longer centralized but becomes scattered in several distribution channel locations close to the load. The interconnection of PV into the distribution network may result in potential disruption of operating conditions and result in problems in power quality. The hosting capacity is defined as the number of new production or consumption that can be interconnected with the network without any adverse impact on the reliability or quality of the voltage on the consumer. The hosting capacity also ensures that there are no broken parameters, i.e., the current carrying capacity distribution network and power flow direction. An iteration approach with voltage constraints, power flow, and current conductivity capability is used to determine the amount of PV power capacity that can be injected into the network. The impact of PV interconnection into the network, especially the voltage and power flow is studied to determine the capacity of PV hosting. The results show that the PV hosting capacity of the distribution network in Yogyakarta through GI Kentungan is equal to the current load on the distribution network.

2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

PT. PLN (Persero) has to develop renewable energy which has a minimum energy mix of 23% in 2025 a... more PT. PLN (Persero) has to develop renewable energy which has a minimum energy mix of 23% in 2025 and 31% in 2030. An intermittent renewable-energy power plant like wind and solar power plant, which is uncontrollable and unpredictable, will be massively penetrated. For that reason, sufficient system flexibility is necessary. The effects of intermittent wind and solar power plants in Java-Bali are conducted in this research. The intermittency of wind and solar power plant are modelled from the historical weather data in some areas with the total capacity 1,930 MW, system peak load is 25,325 MW and the total generation capacity before penetration is 35,517 MW. Then the ramping rate difference before and after penetration for every station is evaluated, which can be increases or decreases. Nevertheless, the observations in this study are the increment of maximum ramp up requirement in 30 minutes resolution in Bekasi 4 EHV station become 125.46 MW (before 65 MW) and maximum ramp down requirement in Bekasi 3 EHV station as become 90.36 MW (before 45 MW). For ensuring the ramping rate requirement, Java-Bali system has to increase the flexibility.

2019 International Conference on Information and Communications Technology (ICOIACT), 2019

Distributed generation (DG) is one of the new approach in the installation of power plants which ... more Distributed generation (DG) is one of the new approach in the installation of power plants which the plant location is no longer centralized, but it was spread on the distribution of electricity feeders. Nowadays, the application of distributed generation has increased because it is related to smart feeders and it was related to the development with clean, renewable energy technologies based on solar and wind. This supports government programs to use renewable energy in 2025 by 23% where 35,000 MW of 23% is solar panels in Indonesia. Large-scale development of distributed power plants can affect the conditions of the distribution feeder. Therefore, it is necessary to know the impact of the installation of distributed power plants. This study was conducted to analyze the effects of the penetration of the distributed power plant in this case photovoltaic in 2 cases of installation location. First, the distributed generation was placed in the center of the feeder. Second, distributed g...

2020 12th International Conference on Information Technology and Electrical Engineering (ICITEE), 2020

The accurate real-time state estimation is needed to perform real-time monitoring and control. Ho... more The accurate real-time state estimation is needed to perform real-time monitoring and control. However, the current power system uses SCADA technology as a tool for monitoring and control. SCADA existing measurement device has a few disadvantages: low accuracy, low sampling rate in measuring the measurements data, and asynchronous measurements between instrument. Due to those disadvantages, state estimation resulted has low accuracy, and not in real-time. These disadvantages can be minimized by installing several phasor measurement unit (PMU). IEEE-30 bus test system is applied to simulate the proposed technique. The result shows, the required PMU should be installed in power system that already has 116 conventional SCADA measurements is 6. The location of these PMUs are in buses 2, 10, 12, 15, 25, and 27. That result is achieved in 320 iteration of genetic algorithm (GA). In this paper, mean absolute error (MAE) is used to asses the state estimation accuracy. The value of $\overlin...

2019 4th International Conference on Information Technology, Information Systems and Electrical Engineering (ICITISEE)

Transmission Expansion Planning (TEP) is a plan to increase an electricity transmission network t... more Transmission Expansion Planning (TEP) is a plan to increase an electricity transmission network that aims to minimize the investment costs of network development by calculating account the power losses on the transmission line. TEP considers and fulfills the requirements such as technical, economic, and reliability of the electric power systems. In this study, the Genetic Algorithm (GA) method was used to minimize the investment costs by calculating power losses in the Garver’s 6-Bus transmission network system. Furthermore, future value factors were used in this study. The optimization method using GA is selected since it provides solutions to the non-convex problems found in TEP. The simulation was conducted on Garver’s 400 kV 6-Bus Network systems. The simulation resulted a total transmission cost of 1,849,223,222 USD with a standard deviation of 1,592,336 USD and an RMSE of 1,552,017 USD.

PT. PLN (Persero) has planned to develop a new renewable energy which has a minimum energy mix of... more PT. PLN (Persero) has planned to develop a new renewable energy which has a minimum energy mix of 23% in 2025 and 31% in 2030. An intermittent renewable energy plant, which is uncontrollable and unpredictable, will begin to be massively used. Associated to the intermittent nature of the of intermittent renewable energy source (IRES), adequate system flexibility is necessary. This study determined the penetration level IRES generating unit using the systems load and existing generating unit ramping rate characteristic, IRES generating unit’s ramping rate and system’s technical minimum load (TML) on the Java Bali System based on the 2017 operation condition. The results showed that the TML value of the operating plant was 12164,69 MW. The ramping up and down capabilities of conventional power plants are 945.04 MW / 30 min and 4006.08 MW / 30 min where ± 5% of penetration of IRES was still applicable for the Java Bali System.

2019 11th International Conference on Information Technology and Electrical Engineering (ICITEE)

State estimation provides state information that subsequently is used in the supervisory control ... more State estimation provides state information that subsequently is used in the supervisory control and data acquisition (SCADA) application function including load forecasting, optimal power flow, automatic generation control and security analysis. So, it is necessary to pay attention in the accuracy of state estimation. However, today most of power system state estimation is provided by conventional measurement. State estimation by conventional measurement has limitation in terms of accuracy. The limitation due to errors in measuring the measurements quantities, asynchronous measurements, and low in sampling rate of conventional SCADA measurements. Those error can be covered by installing several synchronous PMUs in the power system. In this paper, the power system already had 116 existing conventional measurements. So, that the system state is observable. The disadvantages of conventional measurements is demonstrated by dynamic phenomena of load fluctuation during 30 seconds simulation, and those measurements are asynchronous time stamp. The result shows mean absolute error (MAE) of the simulated system is between 10% to 12%. Then by adding several PMUs in buses (1,10,12,28). The MAE of the simulated system decreased is between 0.004% to 0.05%.

2019 International Seminar on Research of Information Technology and Intelligent Systems (ISRITI), 2019

The location of the plant depends on the potential of renewable energy sources. This microgrid po... more The location of the plant depends on the potential of renewable energy sources. This microgrid power source is a renewable energy generator that will be optimized. The mobile power plant in which implemented is a synchronous generator coupled with a diesel engine, and two power plants based on an induction generator which is implemented as a wind power plant and a micro hydropower plant. Generator will be operated in stand-alone and parallel in the system when the load increases, the load decreases. The increase in load and decrease in the burden can be influenced in terms of the location of these renewable energy plants and can cause a decrease in voltage and frequency. To support the benefits of the scattered power plant, good planning is needed, including determining the location of placement and the power of the scattered power plant that is used so that by optimizing the location of the power plant system in order to achieve optimal operating patterns, when the system voltage s...

International Journal of Renewable Energy Research, 2019

Research on determination of PV hosting capacity in a specified distribution system or feeder is ... more Research on determination of PV hosting capacity in a specified distribution system or feeder is popular recently because of many factors such as, the energy policy from the government, low capital cost of PV panel and the modern society life style. PV hosting capacity determination should consider not only the potential resource and the economic aspect but also the technical consideration based on the static and dynamic performance of the distribution system. In this paper, the PV hosting capacity determination are calculated based on the existing distribution feeder using an iterative method considering the voltage regulation, system power factor and apparatus loading. The result shows that driving the PV location into the center of the load and adjusting the reactive power support by PV producer may increase the hosting capacity size.