Chapter 2972

Even if I took a jet plane, it was already afternoon when I arrived at the city where 7712 is located. It was the rainy season here. There had been a hazy drizzle in the sky. In the rain, Yun 12 easily landed on the runway of the airport. Then, the bus that had been waiting there, with a group of people, went straight to the Research Institute.

At this time, Professor Ma has been on the bus. He has not seen him for several years. He seems more mature. He was originally a young man and was entrusted with an important task. However, he did not live up to the trust of Qin Guan. Now, he is very excited when he heard that Qin Guan is going to visit, so he hurried to the airport to meet him.

In this way, on the bus, Professor Ma can start his introduction.

"Now, what the west is developing is the medium voltage AC system. After repeated comparison, we believe that our medium voltage DC system is a generation ahead of theirs." Professor Ma talked about the specific technology.

Although electric propulsion has not been used on warships, it has been finished on other occasions. For example, mining vehicles, such as mining vehicles with Big Macs, which are several people tall on one wheel, obviously can not be driven directly through the transmission shaft. In that way, it is a disaster for the transmission of vehicles. These vehicles, It is in the form of electric drive. The engine is used to generate electricity. The generated electricity is then supplied to the motor on the wheel hub to drive the wheels to rotate.

These are medium voltage AC.

Medium voltage means that the voltage is a medium voltage. Specifically, the voltage is between 3000 volts and 10000 volts. Compared with the commonly used commercial power of 220 volts, it seems to be very high. In fact, it is still medium voltage, because if the high voltage is above 10000 volts, it is often hundreds of thousands of volts.

Around Makarov, he was specially equipped with a translator. He translated these statements almost synchronously. Makarov nodded again and again. Yes, medium voltage DC has too many advantages over medium voltage AC.

First, the problem of grid connected power generation. In the current AC transmission system, grid connected power generation is a difficult problem, which must be synchronized with the frequency. Otherwise, it may offset each other and waste power on the transmission line, and the consequence is to burn it immediately.

For the power grid, this problem is not big. Anyway, as long as it is adjusted once, it will not be used in the future. However, for warships, frequent startup is a big difficulty for grid connected power generation.

At low speed, one generator is enough. To improve the speed and open more equipment, you have to use more generators. When the second one is started, you have to connect to the grid, which is quite cumbersome.

In case of direct current, it's not necessary. Anyway, it's the positive and negative poles. As long as they are connected in place, it's OK.

"At the same time, DC does not produce inductive reactance, and the transmission efficiency is higher." Professor Ma said this to Qin Guan: "President Qin, the road you pointed out is completely correct. We believe that it should be one level ahead of medium voltage AC technology."

Now, Han is in a leading position in all aspects of high technology, and naturally so is the power system of warships.

"President Qin, what plan did you choose?" Makarov looked at Qin Guan in surprise. Qin Guan is a versatile person. He has unique opinions on various technologies. He may not understand the specific details, but there will be no wrong direction in this overall situation.

"Yes, the development of this thing is of great benefit. Our domestic high-voltage transmission will also develop DC transmission technology in the future." Qin Guan said with a smile.

Since the long-distance transmission, AC transmission is the mainstream. After all, it is easy to use transformers to increase and decrease the voltage. However, the transmission efficiency is not high. Therefore, the Han country will also engage in DC transmission in the future, and it has outstanding advantages in this regard. Now is the technology reserve.

Sighing these, in the Misty drizzle, the party had entered 7712 Institute and went straight to a large factory on the side.

"Here is the model we are building." Professor Ma introduced it to you.

It can be seen that there are two marine diesel engines here. As for the power, it should not be particularly large. After all, it directly determines the cost.

Behind the marine diesel engine, a special DC generator is connected, and then connected to the rear motor through the transmission line. The motor is not connected to the propeller, but connected to the test equipment to form a complete circuit.

"Two marine diesel engines are used here, each of which can have 5000 horsepower." Professor Ma looked at the huge engine and made a specific introduction to you: "the generator driven behind is 4 MW, and then drives the motor behind."

This power system can drive a cargo ship of about 10000 tons. Of course, if it is a warship, it may be a frigate of 1000 tons. After all, the speed required by a warship is very high.

"Our system is mainly used to verify the reliability," Professor Ma continued. "Now, let's show you."

The start of marine diesel engine is very slow. After all, it does not start the motor, but uses compressed air. It drives it to rotate by blowing compressed air into the cylinder of marine diesel engine. Moreover, the speed of diesel engine is also very low, generally only a few hundred revolutions, which has a unique flavor.

Now, with the sound of compressed air, the diesel engine on the left first turns low, and a 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 different, because these are found on some obsolete ships and can operate stably. It is really not easy.

With the two engines running, then, all kinds of instruments on the side instrument panel have been displayed. At the same time, there is also a special computer that is outputting all kinds of 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 rising.

"Now, an engine is providing power. When more power is needed, we will connect the second generator in parallel."

With that, he operated on the computer several times and looked very skilled. The curve suddenly jumped up and rose a large section.

The integrated power system needs to be able to automatically and intelligently allocate power and distribute it to the places where it is needed. Therefore, if there are only mechanical devices, it is unqualified, and the focus is power dispatching.

"Next, let's simulate that No. 2 Motor suddenly broke down," said Professor Ma, continuing to operate the interface.