CI Server Brings Efficiency and Reliability to Solar PV Project

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Floating Solar Energy Public Company

Executive Summary

The solar energy public company recognized the importance of providing clean, stable, and sustainable power through a mixed portfolio of conventional and renewable energies to meet the increasing power market demand. Since its establishment, the company has set the target of becoming a world-class regional leader in providing renewable energy through reliable leading-edge technologies to serve the needs of both industry and society.

The company aims to establish a solid foothold in the solar power industry while delivering other renewable solutions not only in the region but also internationally. As of today, its total power production capacity of over 145 MW which consists of a mixed energy production portfolio of 16 solar photovoltaics (PV) utility plants, 14 solar PV rooftop projects, 3 biomass power plants, and the most recently built floating solar PV plant. This floating solar project is the company's first private pilot project with an installed capacity of 8 MW peak (MWp). The total project area exceeds 11 hectares with an investment value of over 5 million dollars.

 

Project Outline

The end-user of the electricity from the PV plant, operates various industrial plants in a broad range of businesses such as agriculture, food, and consumer products, and these process plants are usually equipped with water supply storage ponds, cooling ponds and wastewater treatment ponds. Seeing the opportunity to maximize usage of the pond surfaces by adopting a floating solar power plant for clean power production, The Solar Company proposed its floating solar plant, which is designed to produce 8 MWp of clean power for use at the end-user's factories. The idea was readily accepted, and both companies concluded a 25-year private power purchase agreement (private PPA).

The floating solar PV project makes the most of the ponds within the factory sites which supply water for plant production, by generating clean electricity using photovoltaic technology, thus adding value. Moreover, this hybrid utility setup has the further benefit that the pond water can be used to remove the excess heat generated on the surface of the solar panels.

At present, the project can produce peak power of 6.475 MWAC. With the installation of 16,492 monobifacial PV modules with a power capacity of 8.081 MWp in two ponds with an area of 57,094 mi2, annual power generation is 12.54 GWh or an average of 34,356 kWh/day.

This floating solar PV project, a collaborative partnership between private companies to produce solar power on water surfaces, is closely aligned with renewable initiatives to promote clean energy and sustainable energy.

This is the energy companies' first floating solar project connected to a private grid in collaboration with an end-user. The energy company aims to expand its solar power business expertise and build more solar plants to feed power exclusively to private companies in conjunction with the policies of supporting environmentally friendly and energy efficiency initiatives.

Project Summary

Outline of Supply

Yokogawa Cl Server is installed to monitor and control the solar power production facility including the substation and major equipment such as inverters meters, weather stations, and motor protection relays (MDB), and to manage the “Zero Export” function to the grid. Zero export is a common control function for private grid type solar projects whereby PV energy is 100% consumed exclusively by the off-taker with 0% limitation on active power feed-in to the grid.

The Cl Server-based monitoring and control system is engineered to control active power generation in reaction to active load changes so as to minimize power leaks to the transmission line that could cause power trips. The Cl Server system is also equipped with comprehensive monitoring functions including automatic daily alarms and alerts via email, switch gear on-off control, and performance ratio calculations.

The FA-M3 controllers used in this project are provided with two types of CPU: the new e-RT3 CPU runs Python scripts for the communication link to the Cl Server; the standard CPU is used to connect hardwired discrete inputs/outputs for status monitoring and sequence control.

 

The Challenges and the Solutions

The energy company faced the intermittent power supply profile of solar power generation which did not match the load profiles, causing frequent power trips and reductions in plant efficiency. Yokogawa proposed to implement a new CPU-based Python-programmable PLC to communicate with inverters and meters to collect data from the field and deliver it to the supervisory control and data acquisition system (SCADA, now the Cl Server is used). Communication in Python enables more stable and quicker data retrieval compared to Modbus communication. Besides, the included sequence CPU enables inverter data processing and executes power limit calculations.

The total power consumption is estimated to be 10 MW during working days (Monday to Friday). The floating solar site is expected to generate 8 MWp of that 10 MW load, with the remaining 2 MW to be supplied by the national grid.

During commissioning, however, Yokogawa’s commissioning team found that on Sundays when the factories are closed, and from 11:00 am to 2:00 pm during the lunch break on working days, the power consumption falls to 2 MW. During these periods, power generation far exceeds power demand, resulting in excess power flow on the transmission line and causing the circuit breaker to trip frequently. As a result, the energy company was losing the opportunity to sell electricity during those trips, making the solar power plant less efficient.

Immediately after advising the energy company of this challenge, Yokogawa worked closely with the company, engineering, procurement, and construction contractor(EPC) to add an algorithm for tuning the inverters as quickly as needed to prevent tripping of the breaker. Yokogawa FA-M3 and e-RT3 enabled stable two-way data communication, quick ramp rate tuning, and swift response to inverters, helping to optimize the plan to operate and increase plant efficiency.

System Configuration

 

Customer Satisfaction

Yokogawa and the EPC made the right approach by focusing on solving problems and optimizing operations. The solution has helped eliminate the customer's problem of frequent power trips that lowered the plant efficiency.

Yokogawa and the EPC got involved in this project from the initial phase, and planned and worked on the project specifications and design together with the energy company. This helped Yokogawa comprehend the project goal from the customer's perspective and provide an appropriate solution tailored to the customer's needs. Our solution packaged with Cl Server and FA-M3 controllers running Python enables stable two-way data communication and quick tuning and control of inverters, thus minimizing power trips and indirectly improving plant operation efficiency. Yokogawa is committed to providing reliable remote engineering support to ensure that opportunities are not lost to sell electricity to end-users.

With such commitment and mutual understanding, the energy company is very satisfied with Yokogawa products and services and intends to continue working with Yokogawa and the EPC for the upcoming 1 MW solar plant expansion involving a SCADA for monitoring, control, and engineering for integrating the upper system of the existing floating solar plants.

Industrias

  • Energía

    A mediados de la década de 1970, Yokogawa inició su participación en el negocio de la energía con el lanzamiento del Sistema de control eléctrico EBS. Desde entonces, Yokogawa ha continuado firmemente con el desarrollo de nuestras tecnologías y capacidades para proveer los mejores servicios y soluciones a nuestros clientes en todo el mundo.

    Yokogawa ha operado la red de soluciones de energía globales para jugar un papel más activo en el dinámico mercado de energía global. Esto ha hecho un posible un trabajo en equipo más unido dentro de Yokogawa, el cual conjunta nuestros recursos globales y nuestra especialización en la industria. Los expertos en el sector de energía de Yokogawa trabajan juntos para brindar a cada cliente la solución que se adapta mejor a sus requerimientos sofisticados.

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  • Energía renovable

    El uso de la energía renovable protege al medio ambiente y permite que la sociedad y la industria estén más cerca de lograr la meta de la sostenibilidad. Sin embargo, en comparación con las fuentes de energía convencionales, existen ciertos obstáculos que se interponen en el camino de su rápida adopción, tales como mayores costos de producción y una mayor inestabilidad en el suministro de energía a la red. Como empresa líder en el negocio de control e instrumentación, Yokogawa siempre se ha esforzado para ayudar a sus clientes en diversas industrias a lograr un funcionamiento estable y mejorar la productividad en sus plantas. Con base en el concepto VigilantPlant para alcanzar la excelencia operativa, estamos proporcionando soluciones que allanen el camino para el uso de fuentes de energía renovables.

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