What is the difference between the Power Management System PMS and ABB’s power management system?
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The purposes of the Power Management System (PMS) are as follows: 1. Monitoring of the status of electrical switches in the plant, as well as monitoring of parameters such as power level, three-phase voltage, three-phase current, frequency, and power factor. 2. When abnormalities occur in the plant’s power system, resulting in a shortage or excess of electricity, it can quickly respond by carrying out functions such as automatic load shedding or dynamic braking, in order to prevent complete power outages in the plant. This helps to improve the stability and quality of the entire plant’s power system. 3. It allows for real-time monitoring of the power selling/buying status, and it is possible to predict whether excess power consumption will occur during any given period; accordingly, three-level alarms and load-shedding controls are implemented to prevent fines imposed by the power company for excessive consumption. Functions of the power management system: 1. SCADA: It mainly includes a single-line diagram for monitoring the status of power switches in the plant, power level signals, remote control functions, trend charts, and alarm features. 2. Automatic shutdown: When there is a shortage of power in the factory (the power consumption exceeds the supply), the computer automatically calculates whether an energy balance is achieved based on the collected data regarding power generation and load consumption, and then selects which loads should be shut down according to a pre-set sequence. 3. Dynamic braking: When selling electricity to the plant’s power system and connecting it to an external power source, or in cases where an abnormal disconnection occurs during this connection and results in an excess of electricity in the area (consumption being less than supply), generator sets are appropriately shut down through prior simulation calculations in order to prevent such situations from occurring frequently. 4. AFC (Automatic Frequency Control): When the generator set is not connected in parallel with the external power supply, in order to maintain stability in the frequency of the plant’s own power system and protect it from fluctuations in load, one of several generator sets, or the generator set operating alone, is designated to carry out AFC functions, thereby ensuring system frequency stability. Let’s take a look at the ABB Power Management System, which is implemented using DCS. (Reposted from Industrial Control Network) Product overview: The ABB PMS Power Management System was originally designed for the industries with the highest energy consumption, such as those involved in oil and gas, as well as petrochemical products. In various fields around the world, businesses face the problem of insufficient or unreliable public infrastructure. Therefore, in many cases, you must rely on your own capabilities for energy production and distribution. ABB PMS manages your energy weaknesses, ensuring a continuous supply of energy for the entire plant’s operations by balancing factors such as efficiency, economics, health, safety, and the environment. Detailed introduction: The ABB PMS power management system was originally designed for the most energy-intensive industries, such as those involved in oil and gas and petrochemical products. In various fields around the world, businesses face the problem of insufficient or unreliable public infrastructure. Therefore, in many cases, you must rely on your own capabilities for energy production and distribution. ABB PMS manages your energy weaknesses, ensuring a continuous supply of energy for the entire plant’s operations by balancing factors such as efficiency, economics, health, safety, and the environment. Excellent power management capabilities: Factories require a stable and optimized power grid. To achieve this goal, PMS with recognized features controls and monitors power generation and supply. Rapid load shedding (ranging from 40 to 150 ms, depending on the configuration) depends on rapid network identification and energy balance calculations. The system’s protection/control devices can also be monitored, and load shedding at the fundamental frequency can be initiated when necessary. In addition to its SCADA functions for monitoring and data collection, this system also provides generator control (including integrated speed control devices and excitation controllers), transformer control (including voltage regulation switch control), circuit breaker control (including integrated protection devices), motor control (including an integrated motor control center), as well as power control functions (including peak shaving and load sharing). Its functions also include manual and automatic synchronization of re-acceleration by the motor control center, restart, and monitoring. Innovative scalability: In addition to standard power management features, PMS also offers: ■ Multiple on-site power management options, including load sharing and load shedding ■ Offline simulation of the impact of grid control operations ■ Millisecond-level analysis of electrical disturbances ■ Root cause analysis of events ■ Transmission of SMS messages from remote substations ■ Online access to the power management system as well as operation of switchgear protection and control devices. Advantages: PMS also enables more tailored design of electrical equipment for users. Reorganize power generation, input, and uploading so that each generator, reactor, transformer, and tie line can operate properly within their parameter limits. Close integration and serial communication with the motor control center (MCC), as well as with protection devices, speed control devices and excitation controllers, variable frequency drives and other subsystems, reduces wiring and maintenance costs and leads to savings. The input of power, power generation, as well as the control of frequency and voltage are optimized through active and reactive power control. Due to the large number of load-shedding groups and priority levels that can be set, the load-shedding action is precisely limited to the ideal minimum. As a result, the critical processing device continuously receives power that could otherwise be discarded. The restart function ensures safe recovery after operating under load rejection conditions. The system also provides lower NOx emissions for the advanced control of DLN turbines, which is another operational advantage offered by this system. It also provides the operators with the tools and access they need to better control the grid configuration from the main control room, as well as the settings and status of all machines (transformers and generators), and the starting of large motors. At the same time, they also receive a clear description of the network configuration (main circuit breakers and substation setup), the network load, and the health status of the control system. The advanced feature PMS is a first-class solution equipped with sophisticated features, whose performance exceeds that of traditional automation systems. These features include: ■ Wide measurability in terms of size, performance, and functionality; ■ Redundancy at various levels; ■ Multilingual support; ■ Support for traditional, standard, and ongoing developments in communication protocols. These protocols include: OPC, Modbus, PROFIBUS, PROFINET, TCP/IP, IEC60870, DNP3, IEC61850. ■ High-speed communication capabilities ■ Support for the IEC61131-3 programming language ■ Integrated monitoring system ■ Integrated subsystems, including GPS, weather stations, and motor control centers ■ Enhanced security and access control. In fact, in power control, there are many more devices and systems that are not related to DCS. What structure do you think is more reasonable and better? Or perhaps you could share what kind of power management system is used in your own factory.
ABB’s PMS is called ENMCS. Power grid management and control system. The most important is management, followed by control. Domestic power grids generally feature 4 remote controls and 4 signals. So, many people play RTU. Or simply insert a card into the computer. Objectively speaking, given the current low level and poor quality of power grid monitoring in my country, this approach is feasible and can be used for many years to come. Indeed, the advanced grid monitoring systems in Europe and the United States have shifted too much towards a focus on “management”. Let me briefly explain a few concepts of ABB’s “grid management and control system”. 1. ESD2000, ESD3000. This system belongs to ABB-PPLV; in China, it is primarily promoted by ABB Xiamen Low Voltage and is mainly used for the monitoring of low-voltage and medium-voltage power distribution. The style is similar to the systems of domestic companies such as Nanzi, NARI, XJ, and Sifang. It has simple functions and is easy to use. The interface has also been fully localized to Chinese. The computer in a SCADA system is the core of the system; it does not have any logical control functions. A large number of electricity meters, instruments, and measurement points (such as RTUs) are connected to the computer via 485 or 422 interfaces to enable monitoring. There are occasional simple controls, such as tripping. 2. The ENMCS system itself was developed by ABB-PA. It is an important component of PMS. It is the soul and central nervous system of PMS. PA has developed this system specifically for PPHV, PMMV, and PS. Analyze it from an architectural perspective. The hardware platform of ENMCS is mainly the ABB AC800M DCS. In the HVDC field, rectification mainly uses AC800PEC, which is more than 10 times more expensive than AC800M. Mach-II is generally used in converter stations. However, the Mach-II also had a short lifespan and was soon to be replaced by the AC800PEC. In HVDC, AC800PEC’s only competitor is Siemens’ TDC; ABB holds more than 60% of the global HVDC market share. The well-known companies in the field of high-voltage power transmission and distribution, such as GE and Mitsubishi, are far from being able to compete with ABB in this area. What does the AC800M mainly do in the factory? A large number of electrical meters are available, such as electricity meters, meters for measuring active power and reactive power, as well as meters for calculating compensators. The periodic synchronization device is an instrument that can connect to the AC800M controller via interfaces such as IEC101 and 104. In China, people usually go for the 485 cards for computers. . . Relay protection devices, with fast switching (it’s presented as if it’s a patent), communicate with the AC800M via 485. The MCCs in factories are usually intelligent MCCs with fieldbus interfaces, such as those from ABB or Siemens that come equipped with Profibus DP interfaces. It can be attached to the AC800M controller in a very simple and convenient manner. For other functions such as closing and tripping of high-voltage switches, communication can be used directly. For load switching in the distribution cabinet (that is not from ABB), it can be achieved using the DI and DO inputs of the DCS; for those from ABB, hardwiring is used. The DCS can also be utilized for this purpose. These can replace the manual operation of closing and opening switches in the past. Normally, our closing and opening operations are carried out manually. Only tripping is automatic; short circuits, overloads, and phase loss are not. These are merely the most basic functions that DCS can perform; what’s important is management. . . Automatic load balancing, automatic unloading, automatic switching between the generator and the power grid, intelligent dynamic braking. These are the advanced management control functions. The upper-level system for the AC800M is 800XA. ENMCS was developed specifically for power grids based on 800XA, and it features a large number of function blocks, panels, and process libraries specific to power grids (is this also how it’s called in the power industry?). The IMS in 800XA is usually an optional feature due to its high cost, whereas IMS is practically required 100% of the time in ENMCS. Without IMS and Oracle, many aspects of ENMCS are incomplete. Personal summary: ABB’s grid management system is excellent. But first of all, your power distribution and transformation equipment should preferably be from ABB; and even if it’s not from ABB, it must at least be digital and equipped with communication interfaces that support open protocols. Otherwise, it is difficult to achieve intelligent communication. To do this, your company or power grid company needs to be very wealthy – not just moderately rich, but truly extremely wealthy. Otherwise, even if the product is good, if you can’t afford it, it’s useless. Currently, Shell, BP, and Middle Eastern oil companies use it frequently; wealthy companies such as Roche Steel and Pfizer also make use of ENMCS. Next, if you really want to use this system. The quality of your maintenance staff must be very high; as for the technicians and engineers working in the power grid supply systems, everyone knows what level they are at. Those in charge of electricity just know how to exploit the people – give them real airplanes and guns instead. Will he do it? Apart from being able to click the mouse, can it be used for maintenance? Once a problem occurs, issues with the power grid are serious problems. The skill level of the technical personnel in our country’s current power supply system is extremely low; they are not qualified to work with this system. It’s better to simply use domestic products – that’s patriotic and also makes maintenance easier. Finally, to be objective. The current state of our country’s power grid is not actually suitable for the large-scale deployment of ENMCS systems. To be honest, it’s just that the foundation is weak and inadequate. We must face reality. Don’t believe the nonsense sold by ABB-PS. Additionally, just as a brief note, the size of the ENMCS software is as large as 17G – it consists of 2 DVDs in D9 format and 1 DVD dedicated to power grids. 1 CD. Online document. It’s a little over 2G. However, objectively speaking, its control core, the AC800M, is indeed a good product. Compared to all the DCS and PLC systems available on the market today, the AC800M is the most suitable for power grids, as well as for power transmission, distribution, and supply systems. This is related to the positioning of the ABB Group itself. In addition to supporting Modbus, AC800M also supports IEC60870, DNP3, and IEC61850. It offers very good support for OPC. Every effort is made to provide support for PROFIBUS; PROFINET is not supported at the moment, but support will be available soon. The AC800M is the DCS that supports the most open protocols at present, as well as the one that supports the most grid-specific protocols. A similarly similar system is Siemens P&TD’s (Power and Distribution Group) Sicam system. Unfortunately, however, the main hardware of SICAM is based on the S7-400. Although P&TD has developed many dedicated communication modules of its own, the S7-400 itself does not provide good support for many open communication standards and power grid protocols. This post was last edited by qiaopeng1231 on 2009-4-15 12:30.]