However, it is rather challenging to make a filter design that is robust and stable during grid faults and other unusual operation states. The purpose of a filter is to absorb specific harmonics and eventually compensate the reactive power. Since the grid parameters are project-specific a grid filter is usually an engineered solution. This applies mainly for the grid side filter. If possible, a filterless VFD design is preferred. Of course, there are high performance applications that require speed and/or position encoder.
Kiss keep it simple stupid software#
In sensorless variant the speed is calculated in VFD software based on electrical signals that are already available. unbalance), environmental factors (dust, vibration) etc. Performance of an encoder is affected by multiple factors such as physical distance between inverter and motor, type of signal, interfences with other equipment (EMC topic), installation aspects (e.g. Sensorless speed controlĮlimination of a speed encoder can also be seen as a step towards KISS. It reduces the parts count, simplifies the maintenance job throughout the lifetime of equipment and boosts the availability.
A fuseless design will be more in line with KISS principles. In the example of a 5 MW, 4.16 kV multi-cell inverter a total amount of 36 fuses is needed (some manufacturers reduce the quantity to 24 pcs using two fuses per cell). And again, there is the topic of quantity. Fuses also naturally age making the maintenance somewhat cumbersome. The fuse needs to have very quick response to provide required protection of semiconductor devices. Use of fuses in medium voltage VFDs is tricky. Thus increasing the probability of leakages. Inverter with high quantity of semiconductors also requires large quantity of plastic pipes distributing the water to the individual heat sinks. Similar situation is for example with cooling pipes in case of a liquid cooled VFD. 5 MW, 4.16 kV neutral point clamped (NPC) inverter:Īnd it does not involve power semiconductors only.Instead of using large quantity of components and engineering complex redundancy concepts the same or even better reliability figures can be achieved with low parts count and no semiconductor redundancy. VFD topology utilizing medium voltage semiconductors with high power density and low parts count is one example.
KISS aims to eliminate the root cause of the problem rather than solving the consequences. When you Keep It Simple Stupid it’s easier to understand and most importantly easier to remember.How to apply the principle in medium voltage drives? There are several areas such as hardware design, protection concept or software architecture. In a world of complexity humans still crave simple solutions for their problems. What empire are you trying to build? Take a moment to think about it. 4 simple words help build a pizza empire. With that simple message, it’s a prime example of the K.I.S.S. Who’s John Schnatter? He’s the guy that says “Better Ingredients, Better Pizza.” I’m sure your mind and fill in who John Schnatter is and the company.
Just like John Schnatter always says at the end of his commercials. When you have a simple message it’s easier to remember. That confusion will kill your business and any hopes of growing it. If your confused chances are your customers are as well. If you own a business take an honest look at your marketing strategy if there is one. Good marketing should spark some feelings, but we need to be smart as to what feelings we’re sparking.
You don’t want to confuse, overwhelm or worse yet annoy your customers. The same thought can be applied with any marketing strategy. As complex as things are getting the human element still likes things simple and easy to understand. Our world as a whole is getting more complex with the growth of new technologies and how we use them. Just like the title above says…Keep It Simple Stupid. principle chances are you’ve been in a military or para-military organization.
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