介绍了EAST 极向场电源中所使用的15kA 四象限变流电源;提出了一种新的四象限运行控制方法,即大电流时无环流运行,小电流时利用同相逆并联结构固有的两个绕组构成交叉有环流运行,成功地克服了同相逆并联结构中变流器有环流运行时产生的直流环流问题,减少了环流电抗器和变压器的造价。试验证明,该方案运行可靠、造价低,能充分利用设备的容量,可实现15kA 的有环流运行。 A 15kA four-quadrant variable-current power supply used in the EAST polar field power supply is introduced. A new four-quadrant operation control method is proposed, that is, no-circulation operation when large current is used and two The windings form a cross-circulation operation, which successfully overcomes the DC circulation problem caused by the converter circulating in the same phase and inverse parallel structure, and reduces the cost of the circulating reactor and the transformer. Test proved that the program is reliable, low cost, can take full advantage of the capacity of the device can be achieved 15kA circulated operation.