The generator is in parallel, can the generator be in parallel if there is a load

As you can see from your description, the generator you want to connect to the grid is a synchronous generator. There are 4 conditions required for a synchronous generator to be connected to the grid:

1. The frequency of the generator must be the same as the frequency of the power grid;

2. The voltage waveform of the generator and the power grid should be the same;

3. The voltage and phase of the generator and the power grid should be the same;

4. The phase sequence of the generator and the power grid should be the same.

General conditions 2 and 4 have been solved in the design and manufacture of generators, so the problems that arise are mainly 1 and 3.

Care & Cleaning.

1. The maintenance of the generator set must be carried out in a state of shutdown, in order to ensure that the generator set will not start by mistake, the generator set must be removed from the negative cable of the starting battery before cleaning.

2. The inside and outside of the alternator should be cleaned regularly, and the frequency of cleaning varies depending on the environment where the unit is located. Disconnect all power sources before cleaning, wipe off any dust, dirt, oil, water or any liquids from the surface, and clean the ventilation net.

Support the statement upstairs, if the load is still negative, check whether the CT and PT wiring methods are correct, is the polarity reversed?

Initial phase angle. Phase. Phase sequence. Frequency. It must be the same to merge the car.

Generators of different power can only be connected in parallel for a short time" - I think this sentence is a bit one-sided, in fact, the key is not whether the power is different, or the speed regulation and voltage regulation characteristics of each unit play a decisive role.

The most common example is that a power plant, even a relatively small one, can be connected to the grid, and the power of the generators in the power plant is not comparable to the grid. However, it should be noted that the premise is that the relay protection and monitoring of the power plant are very in place.

As a power station on a ship, the designer will generally choose several units of the same model, and of course there is no problem in merging the vehicles. If the shaft is issued to delay the filial piety motor and the auxiliary generator are merged (the power is different, the model is also different), then the specific problem should be analyzed.

Let's start with the reason why "you can only merge for a short time". Theoretically, as long as the three elements of merging are satisfied, the merge can be met. However, it is difficult for units of different power to have the same characteristics, assuming that they can be combined and the load of each unit is also balanced, when the load of the power grid changes slightly, due to the difference in characteristics, there will be unstable factors immediately.

The difference in speed regulation performance will lead to uneven active power distribution of each unit, and the difference in pressure regulation performance will cause reactive power disorder. The unpredictability of load changes on board is currently beyond the control of general ship power stations, and the changes of active and reactive power are intertwined, and this complexity is even more unimaginable to rely on human monitoring. Therefore, it is possible to get on the car for a short time and do simple actions such as transferring the load, and it will inevitably break down due to factors such as overload and reverse power after a long time.

Let's talk about "different power units merging", which should be easier to understand, after merging assuming that the load of the power grid mutates, even if the characteristics are similar, it may be that the high-power unit has increased by a fraction of the power, and the small unit has been overloaded.

Although the automatic control of ships has been done very well, the generator sets with different performance are very different, and the production plant cannot produce such control products in a unified standard. It is believed that the development of science and technology in the future, sooner or later, will link units with different power and different characteristics at low cost. However, due to cost and other reasons, at least for now, we have not been able to see such a product.

nanmian32

I searched for the second floor, and I thought, if it's time for the load shift, it shouldn't be possible, right? Because a high-power generator can withstand a higher load than a small generator? And how can load shifting be realized?

Heroes, please tell us what you think!

The generator can be combined under load, just make sure that the total power of the generator is greater than or equal to the power required by the load.

Update 1:I know all the above requirements.

Is it necessary to install a leak in each generator and an electronic governor in Yuanzi.

Please draw a picture of how to connect. Thank you.

The principle and method of generator parallel (synchronization) due to the increasing load of the power network, and it is an unstable increase, high and low, and the output of the generator is limited, so there will be the emergence of parallel generators, the advantage is that you can increase the number of parallel generators at any time, the voltage and frequency are stable, improve the power factor of the power network (transmission wires and cables), and the same type of generators can be synchronized (parallel), such as DC generators, single-phase alternators, three-phase alternators, Single-phase high-frequency generators, three-phase high-frequency generators, and generators of different cavity ages are more troublesome if they are to be connected in parallel. To connect generators in parallel (usually three-phase alternating current), four conditions need to be met: 1

The voltage should be the same 2The frequency should be the same 3The phase order should be the same as 4

If you want to be the same as the above four conditions, you can synchronize As for the method, it is not a few words that can be parsed You can email : email protected] ** : 60133609333 I will try your 2012-01-15 16:

35:01 Supplement: 1

The voltage should be the same 2The frequency should be the same 3The phase sequence should be the same 4

The phase angle should be the same 2012-01-18 23:36:40 Added:

Since you all know, why don't you draw your own pictures, you may not know how to draw them.

1》The same order is the same. 2》The voltage is comparable. 3》The frequency is the same.

Parallel vehicles are only allowed when the voltage, frequency, and phase sequence are the same or close to each other.

Four conditions for generator sets to be connected to the grid:

1. The frequency of the generator is the same as the frequency of the system.

2. The outlet voltage of the generator is the same as the system voltage, and its maximum error should be within 5%.

3. The phase sequence of the generator is the same as that of the system.

4. The voltage phase of the generator is consistent with the voltage phase of the system.

When the above four conditions are met, the grid-connected switch can be closed, so that the generator set can be integrated into the system to run the generator generator set.