ABB SB510 3BSE000860R1 Power module Controller module driver
Brand ABB color standard application Industrial height 166mm rated current 226mA
Protection Level IP45 Suitable for motor power 268KW Application Site Power Industry Material Code GJR2391500R1220 Power industry HIEE401782R0001 Part No. SB510 3BSE000860R1
Applicable pipe 2 Whether imported is weighing 1.88kg can be sold nationwide
ABB SB510 3BSE000860R1 Power module Controller module driver
The so-called damping is to stop the disturbance and calm the oscillation. Function of synchronous generator damping winding: the generator damping winding is structurally equivalent to a short-circuit squirrel cage winding superimposed outside the rotor excitation winding, and its function is equivalent to a squirrel cage asynchronous motor that rotates synchronously with the rotor, which plays a regulating role in the dynamic stability of the generator. Because the rotating magnetic field of the fixed rotor rotates synchronously during the normal operation of the generator, the resistance winding does not cut the magnetic flux and therefore does not induce current. When the generator disturbance makes the rotor speed lower than that of the stator magnetic field, the damping winding cuts the stator flux to generate induced current, and the torque generated by the induced current on the damping winding makes the rotor accelerate.
Negative damping is the opposite. The negative damping of SB510 3BSE000860R1 excitation device refers to the adjustment effect of the excitation device on the power Angle swing of the system, which will increase this swing and is not conducive to the stability of the system. PSS excitation additional controller is an additional feedback control, that is, in the excitation regulator, in addition to introducing the generator terminal voltage as the main control signal, and then introduce a leading additional control signal, acting on the regulator, change the excitation output, so that the whole excitation device produces positive damping torque, so as to improve the stability of the system.
Low frequency oscillation of power system occurs both at home and abroad, usually appearing on long-distance, heavy load transmission lines, or weak liaison lines of interconnected systems, and is more likely to occur under the condition of fast response and high magnification excitation system. It is generally believed that the main reason for low frequency oscillation is that the per unit reactance of large capacity generators in modern power systems increases, resulting in an increase in electrical distance, coupled with long-distance heavy load transmission, resulting in a reduction in the damping of the system to the mechanical mode (whose frequency is determined by the mechanical inertia of the equivalent generator); At the same time, due to the hysteresis characteristic of the excitation system, the generator generates a negative damping torque, which leads to the occurrence of low frequency oscillation. Using PSS or other methods composed of additional control of excitation control system can compensate negative damping torque and suppress low frequency oscillation.
The SB510 3BSE000860R1 Power System Stabilizer (PSS) is a control device attached to the excitation regulator. With the wide application of self-parallel static excitation system, PSS additional control has become one of the indispensable functions of excitation system. Good PSS additional control can increase the positive damping of the weakly damped or negatively damped excitation system, and can effectively suppress the low-frequency oscillation of the power system, thereby improving the maximum output (transmission) capacity of the generator set (line).
Prevention of power system oscillations: improving stability level
The oscillation of power system is relatively common in small systems, and rarely occurs in large systems. But its harm is also more terrible, it must be prevented!
In the small system occurs more, mainly in the small system there are a lot of unstable loads, the power station in the system is relatively small, in its load when a large change is difficult to make the system stable, it is also likely to shock.
In small systems, sometimes improper installation of some equipment may also cause system oscillation. For example, the size of the resistance-capacitance absorber at the switch is inappropriate and causes a small oscillation of the system.
SB510 3BSE000860R1 Method of handling power system oscillations
If the oscillation tends to be stable, that is, the smaller the oscillation, there is no need to operate, and the thought of dealing with the accident is ready. If it is out of step, it is necessary to create conditions to restore synchronization as soon as possible.
1. Increase generator excitation. For a generator with an automatic voltage regulator, the action of the automatic voltage regulator and the force excitation device shall not be interfered with within 1min, and for a generator without an automatic voltage regulator, the excitation shall be increased manually. The role of increasing the excitation is to increase the tension between the magnetic poles of the fixed rotor to weaken the inertia of the rotor, so that the generator is better pulled into synchronization when it reaches the equilibrium point.
2, if a generator is out of step, it can appropriately reduce its active output, that is, turn down the turbine guide blade, so that it is easy to pull into synchronization, which is like reducing the rotor impulse. If the two parts of the system lose synchronization, each power plant should increase the load or reduce the load according to the actual situation, because then the frequency of the sending end system increases, the frequency of the receiving end system decreases, the power plant with low frequency should increase the active power output, while increasing the voltage to the maximum allowable value, and the power plant with high frequency should reduce the active power output to reduce the frequency as close as possible to the receiving end frequency. It is also necessary to increase the voltage to the maximum allowable value. In short, increasing excitation is necessary.
3. If synchronization is not entered after 1-2 minutes of output according to the above method, it is necessary to detangle the out-of-step generator from the system, or detangle the two asynchronous systems according to the scheduling requirements.
The generator is equipped with a fast excitation system, or the connection with the power system is weak, which can cause static instability such as spontaneous oscillation of the generator on the power system.
ABB SB510 3BSE000860R1 Power module Controller module driver
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