With the release of a series of implementation plans and measures reached by the national and local governments around the “double carbon” goal, in the face of a large number of grid connected uses of distributed energy and clean energy, the progress of modern information technology promotes the rapid development of chip, semiconductor, precision manufacturing and other industries. Under the superposition of multiple factors, power quality will face many new challenges. On the one hand, the power load is becoming more and more complex and diversified. The load with nonlinear, rich harmonic, impact and imbalance characteristics affects the power supply network; On the other hand, users have higher and higher requirements for power supply reliability. Many industries such as chip manufacturing, data center and medical facilities have put forward high requirements for power quality.
Power quality problems are often embodied in power supply interruption, voltage sag and harmonic pollution. Once they occur, all aspects of business development will be seriously affected. For example, in the industrial field, the economic loss caused by abnormal shutdown due to power quality problems can reach about 4% of the annual turnover of the factory; Harmonics and voltage sags may cause huge losses and dangers to manufacturing equipment, UPW, HVAC, process cooling water and other systems, resulting in production losses of up to one million dollars… In the construction field, many of our troubled electrical problems are often caused by power quality, such as overcurrent and overheating of transformer and cable n-line, The three-phase load is not seriously unbalanced; The circuit breaker trips without cause; PLC communication or process controller work is disturbed; Sudden power failure or voltage fluctuation; Abnormal and excessive noise of transformer; Low power factor, high electricity bill
For the problem of power quality, the concept summarized by modern power system is “any power problem of user equipment damage or abnormal operation caused by voltage, current and frequency offset”. The source of the problem is that for the power system in the ideal state, the electric energy is supplied by the three-phase sinusoidal voltage with constant frequency and amplitude, while for the power system in the actual state, due to the change and nonlinearity of the load, the frequency, amplitude and phase difference of the three-phase voltage can not be kept constant, and the voltage waveform is no longer a single sine wave.
Schneider Electric’s quality optimization closed loop – “monitoring analysis governance”
In the face of power quality problems, the emergence of digital and Internet of things technology makes power quality management more “active”, which can strangle the problems in the cradle and avoid accident losses: the equipment in the electrical system are interconnected, and the key data at all levels of the system can be comprehensively and accurately monitored through sensor technology; Powerful data transmission, storage and computing technologies make it very convenient for local data to be analyzed in the cloud; With the analysis results of monitoring data, problems can be predicted and preventive measures can be taken. This is the logic for Schneider Electric, a global digital transformation expert in the field of energy management and automation, to realize active power quality management, use digital technology to build a digital distribution solution covering “monitoring analysis governance”, and finally form a closed-loop guarantee of power quality through layer by layer control.
Analysis: Based on the monitoring information, the data platform and domain experts need to cooperate to provide analysis in order to find the problems and find the causes. Schneider Electric can analyze alarm events with the help of Po power monitoring system; PME power management system provides professional power quality analysis and impact report, and experts analyze it and give preventive maintenance suggestions; PA power consultant can analyze data quality and power health, predict system power quality problems, improve energy efficiency, and realize active operation and maintenance with professional technology. Through the report and analysis, the problems that really affect the power quality can be determined, and the power quality experts can put forward suggestions accordingly to point out the direction for adding treatment equipment, so as to provide users with a practical scheme report to optimize the power quality level and improve the power supply availability, system reliability and power supply continuity, which can be used as a strong support for power quality management.
Governance: governance is the hardware link of the final implementation. The performance and quality of governance equipment are directly related to whether the problem can be solved. High adaptability and low failure rate are the basic points. Schneider Electric will add appropriate treatment equipment according to the analysis results on the basis of power management analysis, electrical capacity analysis and power factor analysis of PA power consultant to ensure the safe operation of distribution system and lean production of the enterprise. By installing appropriate control equipment such as VCK static reactive power compensation, PCS + / pcsn active filter, PQE dynamic reactive power compensation and DVR / DVRs dynamic voltage compensation, power quality problems such as harmonics, voltage sag and three-phase voltage imbalance are resolved to ensure the normal and stable operation of core precision equipment in case of voltage fluctuation or sag.
The power quality closed-loop scheme escorts the electrical system
The three links of “monitoring, analysis and treatment” form a closed loop again and again, which can avoid the failure of the distribution system, improve the health level of the power system, optimize the power quality, and escort the safe and reliable operation of the electrical system. Efficiently and uniformly manage the system equipment, system and its massive data, and through safe and effective data analysis, we can timely find potential power hidden dangers, improve the stability and sustainability of power supply, and reduce energy costs. Specifically, the power quality closed-loop scheme created by Schneider Electric can realize the following values for users:
Prediction and timely disposal of faults: the software and hardware equipment in the power quality closed loop can monitor various parameters in the power system in real time, help the project operation and maintenance team understand the operation status of the distribution system of the whole project in an all-round way, and meet their real-time monitoring and control needs for system operation parameters. With the help of the analysis system, the operation and maintenance personnel can understand the potential risks of the system in advance, protect the system in advance and avoid accidental shutdown. If an event occurs, it can also timely determine the fault location and causes of the distribution system, quickly solve the quality problems and minimize the downtime. In addition, the analysis system can also conduct a comprehensive traceability to obtain the alarm priority and fault event sequence, so as to more accurately and efficiently analyze the causes of fault, and carry out more targeted key maintenance and patrol inspection for specific distribution system points in future operation management, so as to avoid the recurrence of fault.
Power quality optimization: a series of power quality problems, including voltage, current and frequency offset, may cause serious consequences such as equipment damage, shortening of equipment service life and accidental shutdown of equipment. With the help of power quality analysis tools, the operation and maintenance personnel can fully understand the existing and possible power quality problems in the distribution system, apply the remedy to the case according to the causes of specific problems, and improve the performance of the electrical system: power factor, harmonic, three-phase balance and voltage stability through reactive power compensation, harmonic treatment and voltage stabilization, so as to ensure the stable operation of the power system, This is also the final goal of power quality management.
Remote intelligent control: bottom distribution products with interconnection function, such as sensors and power quality instruments equipped with advanced digital technology, can not only accurately measure the power consumption data of the distribution system, but also directly or indirectly transmit these data to the cloud through the gateway, providing important data support for remote management. Managers can view, analyze and locate faults in time by means of e-mail, mobile application or PC software message push. At the same time, combined with edge control software such as remote control system, operation and maintenance personnel can issue control and operation instructions to distribution facilities through intelligent terminal without going to the facility site.
The power quality closed loop built by Schneider Electric fully conforms to the industry development direction of increasingly complex and diversified power load through three links of monitoring, analysis and governance, and helps power sensitive industries such as chip, semiconductor and precision manufacturing to deal with power quality problems.
On the road of building a new power system and developing high-end and sophisticated industries in the whole society, Schneider Electric will always take customer demand as one of the core driving forces of technological innovation and product R & D. With its rich practical experience in providing customers with high-quality power quality optimization products and solutions in key energy supply and use places in public utilities such as electric power and natural gas, petrochemical industry, energy, hospital and other industries, it comprehensively promotes the improvement of the overall level of power quality and power quality optimization in all walks of life. At the same time, With the concept of “green energy management” initiated by the brand, it provides empowerment and assistance for the improvement of energy efficiency in all walks of life and the realization of the goal of “double carbon”.
Post time: Dec-21-2021