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- The brake resistance scheme mainly involves the selection and application of the brake resistance to ensure the smooth operation of the power network and protect the inverter from the harm of renewable energy. Brake resistance is a carrier used to consume the regenerative energy of the motor as heat energy, and its selection and use are very important to protect the inverter and ensure the safety of the system. The selection of brake resistance needs to consider two important parameters: resistance value and power capacity. In engineering, commonly used brake resistors include corrugated positive and aluminum alloy resistors. Ripple resistance because of its surface vertical ripple is conducive to heat dissipation to reduce the amount of parasitic inductance, the use of high positive inorganic coating, can effectively protect the resistance wire from aging, extend the service life. Aluminum alloy resistance is widely used in harsh industrial environments because of its tight installation, easy to attach heat sink, high heat dissipation aluminum alloy outer box full envelope structure, with strong vibration resistance, weather resistance and long-term stability. The main function of the brake positive is to ensure the smooth operation of the power network, by directly converting the regenerative energy of the motor into heat energy, to avoid the regenerative energy feedback to the power network resulting in voltage fluctuations. In the process of rapid motor shutdown, if the regenerative energy generated by inertia is not consumed in time, it will directly act on the DC circuit part of the inverter, which may lead to the failure or damage of the inverter. Therefore, the use of brake resistance solves this problem and protects the inverter from the harm of the motor's regenerative energy. There is a basic principle in the selection of the resistance value of the brake resistor: ensure that the current flowing through the brake positive is less than the maximum allowable current output capacity of the brake unit, so as to ensure that the choice of the resistance value can effectively consume renewable energy without causing overload to the system. In addition, the power of the brake resistor is determined according to the resistance value and utilization rate of the resistor to ensure that it can withstand the load in practical applications.
