(1996) Reliability Evaluation of Power Systems一书中介绍的可靠性评估PJM方法有下面几句话:& G* B% B* `2 {/ Z0 [
1)4 u Z0 o3 ]1 m& L1 \# Q2 ` It is necessary in a practical system to first define an acceptable risk level in order to determine the maximum demand that a particular committed system can meet. 3 [8 r7 u$ {, ` _4 m. D2 N
2)Consider, for example, that a risk of 0.001 is acceptable. If additional generation can be made available in System A within 1 hour, the required spinning reserve is only 30 MW and a demand of 170 MW can be supplied. 5 t6 P- |4 p* H$ c+ Y5 p3) In practice an operator would use the PJM risk assessment method by adding, and therefore committing, one unit at a time from a merit order table until the unit commitment risk given by the generation model became equal to or less than the acceptable value for the demand level expected.5 Q- I* P# f/ }( P6 I- O( A# Z ( D5 w3 R* C# y' Q) R, [8 g1 ^( f原文2句的意思:假设系统允许的风险水平为0.1%。对系统A,若在1h内可以获得额外发电容量的支持,那么,A系统的旋备需求为30MW,可带负荷170MW。 ! f0 f6 y; Y9 l T/ R' B; c1 N9 i3 d4 z; d* F& J
我的疑问: ) ~+ e& { \0 X7 r E9 M从表5.2可见,A系统停运容量大于30的累积概率=运行容量小于170的累积概率=0.0915%,即运行容量大于170概率99.9%,此情形下系统可以带负荷170MW,若还可以获得额外30MW旋备,系统可带负荷就应该是200MW。 ; `( E( X/ G" ~# {) T为何原文讲“170 MW can be supplied”? 4 u9 j5 Y) q2 W+ F3 ], `4 h 3 \5 v# O6 M4 i- E) J( f5 B * P8 V% ?) C8 e/ ^. W9 f
旋转备用是系统可以随时顶上来的容量,正常运行时旋转备用并不带负荷,只是在系统发生负荷波动、故障等情况下时才释放旋转备用。 8 @3 ]0 S" S" u' o! O2 x |% I( t$ L所以200MW的系统供电170MW,旋转备用30MW。 2 l9 z. z, z: p. U/ i. t. }这样可对?