S-076N 3BHB009884R0021 ABB 可编程逻辑控制器

S-076N 3BHB009884R0021 ABB 可编程逻辑控制器ABB是电力和自动化技术领域的全球领导者,该技术使公用事业和工业客户能够提高其性能同时降低对环境的影响。配电变压器ABB配电变压器提供最全系列的挂载变压器，可满足任何配电应用系统我们是该行业的主导力量。我们在介绍中领先为不断变化的配电变压器行业提供新产品和服务。我们可以为电力提供经济高效的解决方案分配我们以致力于产品开发。我们利用最新的制造技术保持最先进的质量和生产力。大型垂直集成使我们能够发货在尽可能短的时间内提供高质量的产品生产周期。我们与全球主要公用事业和企业提供产品和服务以满足他们的需求。

S-076N 3BHB009884R0021 ABB programmable logic controller

S-076N 3BHB009884R0021 ABB Programmable Logic Controllers ABB is a global leader in power and automation technologies that enable utility and industrial customers to improve their performance while reducing their environmental impact. Distribution transformers ABB Distribution transformers offers the widest range of mounted transformers for any distribution application We are the leading force in the industry. We lead the way in introducing new products and services to the ever-changing distribution transformer industry. We can provide cost-effective solutions for electricity allocate us to work on product development. We utilize the latest manufacturing technology to maintain state-of-the-art quality and productivity. The large vertical integration enables us to deliver high-quality product production cycles in the shortest possible time. We work with major utilities and businesses around the world to provide products and services to meet their needs.

功率单元串联多电平型。如图2。此变频器采用多个低压的功率单元串联实现高压，输入侧的降压变压器采用移相方式，可有效消除对电网的谐波污染，输出侧采用多电平正弦PWM技术，可适用于任何电压的普通电机，另外，在某个功率单元出现故障时，可自动退出系统，而其余的功率单元可继续保持电机的运行，减少停机时造成的损失。系统采用模块化设计，可迅速替换故障模块。由此可见，单元串联多电平型变频器的市场竞争力是很明显的。

(3) 三电平型。如图3。三电平型变频器采用钳位电路，解决了两只功率器件的串联的问题，并使相电压输出具有三个电平。三电平逆变器的主回路结构环节少，虽然为电压源型结构，但易于实现能量回馈。三电平变频器在国内市场遇到的最大难题是电压问题，其最大输出电压达不到6KV，所以往往需要用变通的方法，要么改变电机的电压，要么在输出侧加升压变压器。这一弱点限制了它的应用。 目前，虽然有人提出了其他不同的高压变频器解决方案，但大都不具有明显的可行性，或者说不具有将上述三种主流变频器结构取而代之的潜力。随着高压变频器成本的进一步降低，在中等功率市场，高低型变频器将会退出竞争，而只关注于较小功率的场合。对于单元串联多电平型变频器，主要缺点是变流环节复杂，功率元器件数目多，体积略大一些，但是，在其他的方式不能解决国内应用的需要，高压器件应用的可靠性还不是太高的情况下，其竞争优势在最近的一段时期内，可能还是无法替代的。三电平型变频器由于输出电压不高的问题，主要的应用范围应该是在一些特种领域，如轧钢机、轮船驱动、机车牵引、提升机等等，这些领域的电机都是特殊定制的，电压可以不是标准电压。在一定的功率水平，三电平型变频器取代传统的交交变频器是技术发展的趋势。三电平变频器的更大发展有待于更高耐压的功率器件的出现和现有产品可靠性的进一步提高。在超大功率场合，即大约8000KW以上的功率，用可控硅构成的LCI（负载换流逆变器）电流源型变频器仍旧是主角。由于上述的技术特征，通用型高压变频器目前是单元串联多电平型变频器占多数，约7成以上。目前国内以利德华福为代表的高压变频器厂家有不下二十家，基本都采用这种电路结构。
Power unit series multilevel type. Figure 2. The inverter adopts a number of low-voltage power units in series to achieve high voltage. The step-down transformer on the input side adopts phase-shifting mode, which can effectively eliminate harmonic pollution to the power grid. The output side adopts multi-level sinusoidal PWM technology, which can be applied to ordinary motors of any voltage. The remaining power units can continue to keep the motor running, reducing the loss caused by downtime. The system adopts modular design, which can quickly replace the faulty module. It can be seen that the market competitiveness of the unit series multilevel inverter is very obvious.

二、高压变频器的市场特点

 (1) 市场普遍接受。如果在5年以前推广高压变频器，一般还要给用户讲解其原理，为什么要使用它。但是现在，经过众多厂家的共同努力，和市场使用效果的宣传，用户已经普遍接受高压变频器，只是在众多厂家中选择谁的问题。

 (2) 业绩很重要。高压变频器一般功率较大，都使用在非常关键的部位。所以用户对产品的可靠性是最关心的。考查可靠性的最好办法，就是去已经使用的用户那里去了解情况，这样的用户越多，说服力就越强.

(3) 服务的重要性不容忽视。高压变频器是大功率的电子设备，在使用中，总会遇到一些问题，高压变频器工作的场合又非常关键，因此，对用户的及时服务是非常重要的。服务是维持用户关系的非常重要的方面。如果服务不到位，或者像有些国外厂家，服务和备件的价格较高，都会影响用户的选择。

(4) 现场的适应性非常重要。一般的高压变频器开发厂家，在自己的实验室里，都很难完全模仿用户现场的情况，所以，产品设计的灵活性怎么样，到了现场遇到问题能否尽快解决，都是非常重要的。由于耗电量大，负载又非常重要，用户往往不希望设备较长时间的试运行，所以，产品设计不严谨，一旦遇到问题，就非常难以解决。近年来，许多厂家的产品裹足不前，就是这个原因。

(5) 价格进一步下降。由于激烈的竞争，以及后来者为了夺取业绩而不得已采用的低价策略，高压变频器的价格下降很快，在某些项目上，一些竞争厂家报出的价格甚至低于成本价。 随着技术的进步，高压变频器除了在已有的市场上继续扩大规模外，还将进一步扩展应用的领域，对于很多负载，还需要解决变频器的工程应用上的问题。

Second, the market characteristics of high voltage inverter

(1) The market generally accepted. If the high voltage inverter is promoted 5 years ago, it is generally necessary to explain its principle to users and why they should use it. But now, after the joint efforts of many manufacturers, and the publicity of the effect of market use, users have generally accepted the high voltage inverter, but the problem of who to choose among many manufacturers.

(2) Performance matters. High voltage frequency converters generally have large power and are used in very critical parts. So users are most concerned about the reliability of the product. The best way to test reliability is to go to the users who already use the situation, the more such users, the more convincing.

(3) The importance of service cannot be ignored. High voltage inverter is a high-power electronic equipment, in use, there will always be some problems, high voltage inverter work occasion is very critical, therefore, timely service to the user is very important. Service is a very important aspect of maintaining user relationships. If the service is not in place, or like some foreign manufacturers, the price of service and spare parts is high, it will affect the choice of users.

(4) Site adaptability is very important. General high-voltage inverter development manufacturers, in their own laboratories, it is difficult to completely imitate the user's site, so how flexible the product design is, and whether the problems encountered on the site can be solved as soon as possible are very important. Due to the large power consumption and very important load, users often do not want the equipment to be tested for a long time, so the product design is not rigorous, once you encounter problems, it is very difficult to solve. In recent years, many manufacturers of products hesitate to move forward, is this reason.

(5) Further decline in prices. Due to the fierce competition and the low price strategy that the latcomers have to adopt in order to seize the performance, the price of the high voltage inverter has fallen rapidly, and in some projects, the price quoted by some competing manufacturers is even lower than the cost price. With the advancement of technology, in addition to continuing to expand the scale of the high-voltage inverter in the existing market, it will further expand the field of application, and for many loads, it is also necessary to solve the problem of the engineering application of the inverter.

 
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