（2） 力平衡法 （ Force balance method ） （3）能量转换法（Power transformation method）: E1=E2+ΔE，测量各种电机的转矩；
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Unified fixed point coordinate transformation (UFP-CT), and a novel zero steady-state error current control method for active power filter (APF) based on UFP-CT were proposed.
提出一种统一定点坐标变换和基于该变换的有源电力滤波器零稳态误差电流控制方法。
The power transmission equation of VSC is simplified by coordinate transformation, and the control system for transmitted power of VSC is designed by use of unsymmetrical triggering method.
并通过坐标变换简化了VSC的功率传输方程，还采用不对称触发策略设计了VSC的传输功率控制系统。
The principle of balanced transformation is discussed. The detecting method of the compensating currents and control mode of the active power filter are proposed.
文中讨论了平衡变换原理，给出了补偿电流检测与有源滤波器控制方法。
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