基于FBD法的四相输电系统电流检测方法

为了检测四相输电系统中的谐波和无功电流，在进一步完善FBD法定义的基础上，提出了一种基于FBD法的四相输电系统电流检测方法。该方法利用锁相环产生参考电压波形，可以准确检测出基波有功电流、基波无功电流和谐波电流，检测结果不受实际电压畸变的影响，实时性好。基于FBD法的电流检测方法与基于瞬时无功功率理论的电流检测方法相比，原理更简单，更适用于四相电路，在负载不平衡条件下检测效果更好。MATLAB仿真结果验证了该电流检测方法的正确性。

Current Detection for Four-phase Transmission System Based on FBD Method

To detect the harmonic and reactive power current of four-phase transmission system, the current detection method for four-phase transmission system is presented based on FBD(Fryze, Buchholz, Dpenbrock) method, which is on the basis of improving the FBD method definitions. In the proposed method, a reference voltage is generated by PLL, the active power fundamental current, reactive power fundamental and harmonic current can be detected accurately. The detecting results are not affected by the voltage distortion with good real-time performance. Compared with current detection method based on instanta-neous reactive power, the current detection method based on FBD method is simpler, and more applicable to four-phase transmission system in unbalanced load. MATLAB simulation results prove the validity of the proposed current detection method.