(1) Excessive voltage error will increase the loss of electrical equipment, shorten the life, and work abnormally, which will damage the stability of the synchronous operation of the power system, the stability of the voltage and the economic operation of the power grid, and will cause the inverter system to report overvoltage fault or undervoltage fault.
(2) The fluctuation and flicker of the voltage are mainly caused by the shaking load, and its excess will endanger the equipment of other users connected to it at the public power supply point, such as making the motor speed uneven and the man-machine interface and electronic equipment working abnormally, which will lead to the inverter reporting overcurrent fault, driving fault, etc., as well as the phenomenon of man-machine interface crash or inaccurate monitoring interface voltage and current display.
(3) Harmonics are injected into the system by harmonic sources (nonlinear equipment and loads), which will affect the service life of power equipment, electrolytic capacitors, transformers, cables, voltage transformers, etc. in the system equipment, threaten the safe operation of the system, increase the power loss of the system, increase the error of measuring the appearance, and interfere with communication. The inverter system presents drive faults, overheating faults, optical fiber faults, etc. in operation.
(4) Three-phase unbalance will make the generator work abnormally, the additional loss of the addition of the transformer will cause its local overheating, the relay protection and automatic device will malfunction, the inverter will produce non-characteristic harmonics, the addition of neutral current will cause electrical noise interference, the loss of the transmission line will be added, and the communication will be interfered with. If the three-phase is severely unbalanced for a long time, it will also lead to severe burning of the three-phase cooling fan of the inverter system and the three-phase small transformer inside the power unit, and then lead to a series of problems such as overheating failure and optical fiber failure.
(5) When the power system is running stably, the whole system has the same frequency. Within the scale of the promised frequency error, it mainly causes the power problem of the inverter equipment; When the error exceeds the scale, it will endanger the safety of the inverter equipment, and even cause the system to collapse and collapse in severe cases.
(6) Temporary overvoltage and transient overvoltage, voltage drop and short-term power supply interruption will directly affect the normal operation of the inverter system, and generally cause overvoltage fault and undervoltage fault.
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