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中文摘要：
研究了交流系统负荷对交直流系统运行特性的影响。给出了最大功率曲线法所决定的最大可送功率。同时，讨论了系统临界短路比的求解方法并据此说明了交流系统负荷对系统强度的影响。详细分析了异步电动机等效阻抗与机端电压的关系。通过电压稳定指标分析了交流系统负荷对换流母线电压静态稳定性的影响，并且给出了临界传输功率和临界电压的求解方法。通过一实际算例，说明了交流系统负荷分别为恒定阻抗和异步电动机时，直流功率输送特性和电压稳定性的差异。讨论了直流输电系统功率输送极限的限制因素，据此明确了如何求解直流功率的输送极限。
英文摘要：
The influences of load in AC system on operational characteristics of AC/DC hybrid system, and the maximum available power determined by the maximum power curve （MPC） method are analyzed. The method to solve the critical short-circuit ratio is discussed and on this basis the influence of the load in AC system on system strength is explained. The relation between equivalent impedance of asynchronous motor and the terminal voltage of the motor is analyzed in depth. The effect of load in AC system on static voltage stability of commutation bus, and the method to solve critical transmission power and critical voltage are discussed. Through an actual case, the differences of DC power transmission characteristics and voltage stability are illustrated while the load in AC system is of constant impedance and asynchronous motors respectively. The influencing factors on available transmission capacity （ATC） of HVDC power transmission system are discussed and how to solve the transmission limit of DC power is given clearly.
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