International freight rate analysis

List of contents of this article:

• 1,International freight rate analysis What are primary FM and secondary FM?
• 2, What is primary FM and secondary FM (the difference between primary FM, secondary FM and triple FM)
• 3, Power system What factors are mainly related to a FM
• 4、International freight rate analysis' title='May I ask what happened to the FM in the power system?' > May I ask what happened to the FM in the power system?

What are primary FM and secondary FM?

1. Primary FM: refers to the inherent ability of the frequency characteristics of the generator set speed control system to automatically adjust the frequency with the change of frequency. Secondary FM: refers to the FM method adopted when the primary FM cannot restore the frequency to the specified range when the power system load or power generation output changes significantly. Secondary FM is divided into manual FM and automatic FM.

2. Primary FM: refers to the ability inherent in the frequency characteristics of the speed regulation system of the generator set, which automatically adjusts the frequency with the change of frequency. It is characterized by fast frequency adjustment speed, but the adjustment amount varies with the generator set, and the adjustment amount is limited, which is difficult for the dispatcher on duty to control.

3. There is a differential adjustment of the first FM, and the frequency of the power grid is not maintained unchanged, which can only mitigate the degree of change of the frequency of the power grid. Therefore, it is also necessary to use synchronizers to increase and slow down the load of certain units to restore the frequency of the power grid. This process is called secondary FM. Only after secondary FM, the frequency of the power grid can accurately maintain a constant value.

What is primary FM and secondary FM (the difference between primary FM, secondary FM and triple FM)

The difference between primary FM and secondary FM is that the first FM participates in the frequency adjustment of the power grid, with a certain amplitude limit and dead zone, secondary FM is to accept intermediate commands or manual commands.

The primary FM is to participate in the frequency adjustment of the power grid, with a certain amplitude limit and dead zone, and the secondary FM is to accept intermediate modulation commands or manual instructions.A FM is carried out by the speed regulation device, and the small FM range is fine tuning.

Secondary FM: refers to the FM method used when the primary FM cannot restore the frequency to the specified range when the load of the power system or power generation output changes significantly. Secondary FM is divided into manual FM and automatic FM.

The difference between primary FM and AGC is that their control objectives and adjustment ranges are different.

The primary FM refers to the FM carried out by the speed modulator of the generator, which transmits the original signal by changing the carrier frequency. In a FM, the amplitude of the original signal remains unchanged, but the different parts of the original signal are represented by changing the height of the carrier frequency.

What factors are mainly related to the primary FM of the power system?

1. [Answer]: C, D The power supply and load power of a stable power system must be dynamically balanced. When the power or load of the power supply changes (take insufficient power as an example), the frequency of the system will be reduced, and the load equipment in the system will affect its active absorption due to the decrease in frequency.

2. The power balance factor is related. The frequency of the power system is affected by the power balance. We know that alternating current cannot be stored, so we can use as much as we send, and the active power emitted and the active power consumed are balanced.

3. The basic principle of primary FM of the power system: the frequency of the power grid is determined by the power generation power and the power consumption load. When the power generation power is equal to the power consumption, the power grid frequency is stable;When the power generation power is greater than the power consumption load, the frequency of the power grid increases; when the power generation power is less than the power consumption load, the frequency of the power grid decreases.

4. Secondary FM: Primary FM has differential adjustment, which cannot maintain the frequency of the power grid unchanged, and can only mitigate the degree of change of the frequency of the power grid. Therefore, it is also necessary to use synchronizers to increase and slow down the load of certain units to restore the frequency of the power grid. This process is called secondary FM.

Who knows what a FM is? What is secondary FM?

FM refers to the FM of the generator's speed regulation, which transmits the original signal by changing the carrier frequency. In a FM, the amplitude of the original signal remains unchanged, but the different parts of the original signal are represented by changing the height of the carrier frequency.

The difference between primary FM and secondary FM is that primary FM participates in the frequency adjustment of the power grid, with a certain amplitude limit and dead zone, and the secondary FM is to accept intermediate modulation commands or manual instructions.

Secondary FM: Primary FM has differential adjustment, which cannot maintain the frequency of the power grid unchanged, and can only mitigate the degree of change of the frequency of the power grid. Therefore, it is also necessary to use synchronizers to increase and slow down the load of certain units to restore the frequency of the power grid. This process is called secondary FM.

What is the primary FM of the power system? What is secondary FM?

Primary FM and secondary FM are two important FM modes in the power system, which are used to maintain the stability of the system frequency. One-time FMIt means that when the load of the power system changes, the generator set automatically adjusts the output to quickly respond to the load change and suppress the initial shift of the system frequency.

Secondary FM: Primary FM has differential adjustment, which cannot maintain the frequency of the power grid unchanged, and can only mitigate the degree of change of the frequency of the power grid. Therefore, it is also necessary to use synchronizers to increase and slow down the load of certain units to restore the frequency of the power grid. This process is called secondary FM.

The difference between primary FM and secondary FM is that primary FM participates in the frequency adjustment of the power grid, with a certain amplitude limit and dead zone, and the secondary FM is to accept intermediate modulation commands or manual instructions.

May I ask what happened to the FM in the power system?

1The basic principle of primary FM of the power system: the frequency of the power grid is determined by the size of the power generation power and the power consumption load. When the power generation power is equal to the power consumption, the frequency of the power grid is stable; when the power generation power is greater than the power consumption load, the frequency of the power grid increases; when the power generation power is less than the power consumption load, the frequency of the power grid decreases.

2. Secondary FM: Primary FM has differential adjustment, which cannot maintain the frequency of the power grid unchanged, but can only mitigate the degree of change of the frequency of the power grid. Therefore, it is also necessary to use synchronizers to increase and slow down the load of certain units to restore the frequency of the power grid. This process is called secondary FM.

3. Primary FM: refers to the inherent ability of the frequency characteristics of the generator set speed regulation system to automatically adjust the frequency with the change of frequency. Secondary FM: refers to the FM method adopted when the primary FM cannot restore the frequency to the specified range when the power system load or power generation output changes significantly.Secondary FM is divided into manual FM and automatic FM.

4. A FM is a regulation mechanism of the power system, which is used to maintain the stability of the system frequency. When the load in the system changes, a FM will adjust the output of the generator set to offset the impact of load changes on the system frequency.

5. Primary FM refers to the inherent ability of the frequency characteristics of the speed regulation system of the generator set, which automatically adjusts the frequency with the change of frequency. It is characterized by fast frequency adjustment speed, but the adjustment amount varies with the generator set, and the adjustment amount is limited, which is difficult for the dispatcher on duty to control.

6. Frequency adjustment, also known as frequency control, is the main measure to maintain the balance of active power supply and demand in the power system. Its fundamental purpose is to ensure the frequency stability of the power system. The main methods of frequency adjustment of the power system are to adjust the power generation power and load management.