高压变频器输出电压自均衡方法

• Format: Patent
• Language: Chinese
• Published: 27.02.2018
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

高压变频器输出电压自均衡方法，包括以下步骤：高压变频器的主控模块在发生功率单元发生故障时，提升高压变频器三相相电压；判断是否出现任意两相a、c的相电压小于剩余相b的相电压的状况，若出现，主控模块基于预设的b相相电压Ub、输出线电压Ul、a相与b相之间的夹角x、a相与c相之间的夹角y或b相与ab线电压之间的夹角z，计算出Ub、Ul、x、y和z中的其余四者；主控模块计算出b相与c相之间的夹角w；主控模块按照获得的Ub、x、y和w向高压变频器的功率单元组发送实际的PWM控制信号，对高压变频器的b相相电压、a相与b相之间的夹角、a相与c相之间的夹角以及b相与c相之间的夹角进行调整，从而实现高压变频器输出电压的自均衡。 A high-voltage frequency converter output voltage self-balancing method includes the following steps: when a fault occurs in a power unit, a master control module of a high-voltage frequency converter boosts phase voltages of three phases of the high-voltage frequency converter; whether the condition that the phase voltages of any two phases a and c are smaller than the phase voltage of the remaining phase b occurs is judged, if the condition occurs, the master control module, based on a preset phase voltage Ub of the phase b, an output line voltage U1, an included angle x between the phase a and the phase b, an included angle y between the phase a and the phase c and an included angle z between the phase