Absorb energy from the network.
The collection of substations and transmission and distribution lines of different voltages in the power system is called the power grid, or power grid for short. It contains three units: power transformation, power transmission and power distribution. The task of the power grid is to transmit and distribute electrical energy and change voltage.
What is the phenomenon of the gradual disappearance of the turbogenerator
Absolutely not~!
Because it is then necessary to convert 100% of the kinetic energy of the water into electrical energy. In fact, it's good to convert 10% of it. It is very simple. Only a small part of the 100 tonnes that flow. of the reservoir can result in the production of electricity. The unit is not counted as a loss. The result must be that the electricity generated by a certain amount of water cannot discharge the same amountwater.
You talk about the “perpetual motion machine” that people have aspired to study and invent for centuries. You can search the word and you will see that scientific knowledge lags behind the modern era. graphics, some of which look like jokes. Just like people in the future will see us now.
Personally, I think “perpetual motion” is a myth, but it should also be a goal. Perhaps tens of thousands of years later, human energy consumption will be close to zero, but "perpetual motion" is a goal. is still a myth and a target.
But even if people end up conceiving of "perpetual motion", it makes no sense, because since it is perpetual motion, the energy produced is equal to the energy consumed, and the energy produced when consumed is equal to the energy initially produced, then Such a thing, if vou ask her to do another job, she will stop moving forever. It can only sustain itself and is it useful to society?
I remember there was a book called "Interesting Physics", which featured many "perpetual motion machines" designed by people in the past. Among them, the closest to "perpetual motion" is probably a drinking duck. I remember the structure. I forgot the principle and what the liquid was in the test tube. The ultimate failure was that it still had to rely on external light, temperature and water. It was incredible that people of that time could conceive of this.
Generator
Normal
When operating
, it provides active power and reactive power to the system ,
The stator current
is late
the terminal voltage
by an angle, this state is an operation in the late phase. When the redProgressive uction of the
excitation current
changes the generator from providing reactive power to the system to absorbing reactive power from the system, the stator current increases from delay at generator lead voltage at the terminals. From one angle, this state is phase-advance operation.
When the synchronous generator is in phase-advance operation, it is in a later phase
Operation state< / p>
The excitation current is significantly reduced, the generator potential
Eq also decreases accordingly from the point of view of the power angle P-
. p>
relation
, when the active power remains unchanged, the power angle will increase accordingly,
The ratio
all the work of the step will also decrease accordingly, and the generator
static
Stability
decreases. Its
stability limit
is linked to the short-circuit rate of the generatorator and external reactance. p>< p>,
Automatic excitation regulator
Performance and commissioning, etc.
During phase lead operation
< p>Generator statorEnds
Magnetic leakage
increases during late phase operation, especially for large generator lines
p>
Loadp>
High, the magnetic leakage at the end is relatively large during normal operation, the temperature of the end iron core pressure finger connection part increases, and the magnetic flux leakage increases. produced during in-phase operation. The temperature increase intensifies during phase-leading operation, the voltage at the end of the generator
decreases and the <. /p>
factory power
voltage It will also be reduced accordingly if it exceeds 10%, it will affect the electrical operation ofe the factory.
Therefore, the phase. -the advanced operation of the synchronous generator should be determined by experiments to determine the depth of operation by phase advance, that is, under the condition of providing a certain amount of active power, how much reactive power will be absorbed to keep the system static? and
transient
stable, so that the temperature increase of each
component
does not exceed the limit and can comply with the voltage requirements.
What factors limit the progressive operation of the generator?
When the inductive power supplied by the system
reactive power
< p >When this is greater than necessary, the system voltage will increase, forcing the generator to generate less reactive power or even absorb reactive power. At this time, the generator may switch from late phase operation toadvanced phase operation. .Restrictions on the generator The main factors in phase advance operation are:
(1)
Limitations on system stability
(2)
Stator side of the generator Component temperature limitation
(3)
Stator current limitation
(4)
Limitation of the installation supply voltage
p>
Phenomena:
Excitation
The excitation current and voltage are significantly reduced,
The power factor
is greater than 1 or greater than 0.97, the reactive power indication is negative , the stator current increases, the stator end temperature increases and the installation supply voltage decreases. the supply voltage is usually drawn from the generator output or generator bus
Bus
Voltage, during phase-advance operation the voltage across the generator decreases indue to the reduction of the generator excitation current and the reverse flow reactive power, which also leads to a reduction in the factory supply voltage