Chapter 2972: Land model

Even if I took a jet plane, when I arrived at the city where 7712 is located, it was already afternoon. It was the rainy season at this time. The sky was always raining hazy lightly. In the rain, Yun Twelve landed easily. On the runway of the airport, then, the bus that was already waiting there, with a group of people, went straight to the research institute.
At this time, Professor Ma has been in this bus. He has not seen him for a few years. He appears to be more mature. He was originally a young man and was entrusted with heavy responsibility, but he did not live up to Qin Guan's trust. After he heard that Qin Guan was coming to inspect, he was extremely excited, and hurried to the airport to greet him.
In this way, Professor Ma can start the introduction on the bus.
"Currently, the medium voltage AC system under development in the West. After repeated comparisons, we believe that our medium voltage DC system is one generation ahead of theirs." Professor Ma talked about the specific technology.
Although electric propulsion has not been used on warships, in other occasions, there are already finished products, such as mine carts, the kind of giant mining carts, and the kind with a wheel that is several people tall. Obviously not. It may be directly driven by the drive shaft. In that case, it is a disaster for the transmission of vehicles. These vehicles are in the form of electric drive. The engine is used to generate electricity. The electricity is then supplied to the electric motor on the wheel hub to drive the wheels. Rotate.
These are medium voltage communication.
Medium voltage means that the voltage is a medium voltage. If it is specifically stated, this voltage is between three thousand volts and ten thousand volts, which seems to be very high compared to the commonly used mains power of 220 volts. In fact, this It is still considered medium voltage, because high voltage is above ten thousand volts, which is often hundreds of thousands of volts.
By Makarov’s side, he was specially equipped with a translator, and these words were translated to him almost synchronously. Makarov nodded repeatedly. Yes, medium voltage DC has too many advantages over medium voltage communication. Up.
First of all, there is the problem of grid-connected power generation. In the current AC transmission system, grid-connected power generation is a difficult problem. It must be synchronized with the frequency. Otherwise, it may cancel each other out and waste electricity on the transmission line. The consequence is immediately burned. .
For the power grid, this problem is not too big. Anyway, as long as it is adjusted once, it will not be used in the future. However, for warships, frequent startup is a major problem for grid-connected power generation.
At low speed, one generator is enough. To increase the speed and open more equipment, you have to use more generators. When the second one starts, it must be connected to the grid, which is quite cumbersome.
If the DC power is used, it is not necessary. Anyway, it is a matter of the positive and negative poles. As long as the connection is in place, it will be fine.
"At the same time, the direct current does not generate inductive reactance, and the transmission efficiency is higher." Professor Ma said to Qin Guan, "Mr. Qin, the path you pointed out is completely correct. We believe that it is better than Medium voltage communication technology is one level ahead."
At present, Han is in a leading position in all high-tech aspects, and naturally the same is true for the power system of warships.
"Ms. Qin, the plan you choose?" Makarov looked at Qin Guan in surprise. Qin Guan is an all-rounder. He has unique insights in various technologies. He may not know the specifics. Details, but in this overall situation, there is absolutely no wrong direction.
"Yes, the development of this thing has great benefits. Our domestic high-voltage transmission will also develop DC transmission technology in the future." Qin Guan said with a smile.
Since the long-distance power transmission, AC power transmission has been the mainstream. After all, it is easy to use transformers to increase and decrease the voltage. However, the transmission efficiency is not high. Therefore, Han will also engage in DC transmission in the future, and in this respect, it has outstanding Advantage. Now is the technical reserve.
Sighing for this, in the drizzle, the group of people has entered 7712 and went straight to a large factory building aside.
"Here is the model we are building." Professor Ma introduced to everyone.
As you can see, there are two marine diesel engines here. As for the power, they should not be particularly large. After all, this directly determines the cost.
The back of the marine diesel engine is connected to a special DC generator, which is then connected to the back motor through the transmission line. The motor is not connected to the propeller, but to the test equipment, forming a complete loop.
"Two marine diesel engines are used here, each of which can have 5,000 horsepower." Professor Ma looked at the huge engine and gave a specific introduction to everyone: "The generators driven by the back are 4 MW each, and then drive The electric motor behind."
This kind of power system is almost able to drive a freighter of about 10,000 tons. Of course, if it is a warship, it is only a 1,000-ton frigate. After all, the speed of a warship is very high.
"Our system is mainly used to verify the reliability." Professor Ma continued: "Now, let me demonstrate it."
The start of marine diesel engine is very slow. After all, it does not use a starter motor, but uses compressed air. By blowing compressed air into the cylinder of the marine diesel engine, it drives it to rotate. Moreover, the speed of the diesel engine is also very low. It's just a few hundred turns, so it has a special flavor.
Now, with the sound of compressed air, the diesel engine on the left spins down first, and a puff of black smoke comes out. Then, it is the diesel engine on the right. If you look closely, the models of the two diesel engines are not the same, because these They are all found on some obsolete ships, and they can operate stably, which is really not easy.
As the two engines started running, the various instruments on the instrument panel on the side had displays. At the same time, there was also a special computer that was outputting various data.
"Now, let's look at the power curve." Professor Ma pointed out the display on the screen, although you may not understand it, at this time, the curve is constantly climbing.
"Now, an engine is providing electricity. When more power is needed, we will connect the second generator in parallel."
With that said, he operated a few times on the computer, and he appeared very skilled, and the curve suddenly jumped up a lot.
The integrated power system needs to be able to automatically and intelligently allocate power and distribute it where needed. Therefore, if there are only mechanical devices, it is unqualified. The focus is on power dispatch.
"Next, let's simulate, the No. 2 motor suddenly failed." Professor Ma said, continuing to operate the interface.