CAJ | 학술논문

基于电网低频紧急状态下系统频率变化特性的一般规律，详细分析了功率缺额扰动下的弱受端小电网暂态频率变化特点及其影响因素，如功率缺额、网内开机台数、负荷类型、故障地点及类型、切荷率、切负荷时间、电容器投切情况等，并给出了定性的理论公式推导。基于上述弱受端小电网频率变化特性的影响因素分析，针对小电网功率缺额扰动后存在的频率首摆下潜深度过大、持续时间较长的特点，提出了弱受端小电网安全稳定控制装置切负荷(简称安控切负荷)措施与低频减载措施的配合原则和具体配合方案：切负荷时间和切荷率的配合、装置动作出口配合。以西北某实际弱受端小电网为例，进行了仿真分析。仿真结果验证了所提配合原则的合理性和2种配合方案的可行性。
기우전망저빈긴급상태하계통빈솔변화특성적일반규률，상세분석료공솔결액우동하적약수단소전망잠태빈솔변화특점급기영향인소，여공솔결액、망내개궤태수、부하류형、고장지점급류형、절하솔、절부하시간、전용기투절정황등，병급출료정성적이론공식추도。기우상술약수단소전망빈솔변화특성적영향인소분석，침대소전망공솔결액우동후존재적빈솔수파하잠심도과대、지속시간교장적특점，제출료약수단소전망안전은정공제장치절부하(간칭안공절부하)조시여저빈감재조시적배합원칙화구체배합방안：절부하시간화절하솔적배합、장치동작출구배합。이서북모실제약수단소전망위례，진행료방진분석。방진결과험증료소제배합원칙적합이성화2충배합방안적가행성。
Based on the general law of system frequency variation characteristics in low-frequency emergency state,frequency influencing factors in a small weak receiving power grid are analyzed at length during the disturbance due to power shortage, such as the quantity of power shortage,number of operating units,type of load,fault locations and types,load shedding time, load shedding ratio,whether to switch the capacitor or not etc.Then the theoretical derivation is qualitatively given.On the basis of analysis of the influencing factors in the above-mentioned small isolated power grid,in light of the characteristics of the excessively large dive depth and long duration of the frequency first swing,two coordination schemes of load shedding and under-frequency load shedding are proposed:load shedding time and load shedding ratio coordination and device outlets coordination.Take a real small weak receiving power grid in Northwest China as an example.Simulation results have verified the rationality of the coordination principle proposed and the feasibility of the two coordination schemes.