What are the maximum nodes of IEEE standard calculation force
IEEE1588 does not specify the maximum number of nodes allowed between master and slave.
Institute of electrical and electronics engineers or IEEE (eye-triple-ee, i-3e) is an international non-profit organization (ORG) and a professional organization dedicated to the research of electronic technology. Is one of the world's largest professional and technical organizations (membership), with 360000 members from 175 countries (by 2005)
is the actual index 127
for the extreme value of single precision floating-point numbers, the actual index of the largest non conventional number is - 126, the offset index is 0, and the index field is 100000000; The actual index of the maximum number of protocols is 127, the offset index is 254, and the index field is 11111110
is expressed in the form of so-called partial value, which is the sum of the actual index size and a fixed value (1023 in the case of 64 bits). If the complement is used, the sign bits of all sign bits s and exp themselves will not be able to make a simple size comparison
extended data:
the relevant requirements of IEEE754 standard stipulate:
1. For a number, the index value expressed by binary scientific counting method is the actual value of the index; According to IEEE 754 standard, the coding value of index part is the coding value of index field of floating-point representation
2. The exponent deviation (the exponent in the representation is the actual exponent minus a value) is, where e is the length of the bit storing the exponent. Subtracting a value into an index must be a signed number to express a large or small value, but the usual expression of a signed number, the complement, will make the comparison difficult
3. The real value of the exponent plus a fixed offset value is used to represent the exponent of floating-point numbers. The advantage is that all the exponent values can be represented by an unsigned integer with the length of e bits, which makes it easier to compare the exponent sizes of two floating-point numbers. In fact, the sizes of two floating-point numbers can be compared in dictionary order
In IEEE754 standard, the maximum positive number represented by 32 bits is (2-2 to the power of - 23) * 2
The mantissa number is actually: 1 implied bit + 23 mantissa = 24 The maximum value ofis 1.111... 111 (23 1 after the decimal point)
is converted to the 23rd power of 1 + 1 / 2 + 1 / 4 +... + (1 / 2) = 2 - (1 / 2) and the 23rd power of 2-2 (- 23)
extended data:
IEEE 754 specifies four ways to represent floating-point values: single precision (32 bits), double precision (64 bits), extended single precision (more than 43 bits, rarely used) and extended double precision (more than 79 bits, usually implemented in 80 bits). Only 32-bit mode is mandatory, others are optional
most programming languages provide IEEE floating-point format and arithmetic, but some list them as unnecessary. For example, before the advent of IEEE 754, some c languages included IEEE arithmetic, but they were not regarded as mandatory requirements (float of C language usually refers to IEEE single precision, while double refers to double precision)
IEEE-30 node system data
in order to better control the economic operation of the generator, the data is in the form of tables to give the original data and power flow results of ieee-14.30.57.118 and other node standard test systems
And the economic parameters and output limits of generator for reference. The IEEE-30 bus system also gives the calculation results of optimal power flow with minimum generation costall power data are the standard unit value with 100mva as the power base value, the unit of voltage phase angle is degree, and the standard unit value of voltage amplitude is. The upper and lower limits of node voltage are 1.10 and 0.95. In power flow calculation, all generator nodes are regarded as voltage control nodes (PV nodes)
IEC: it is the abbreviation of International Electro technical commission. She is also a non-governmental international organization. It is a Class A advisory body of the United Nations Social and Economic Council. It was officially established in December 1906 and is the earliest specialized international standardization organization in the world
IEEE: Institute of electrical and Electronics Engineers (IEEE) American Institute of electrical and Electronics Engineers (IEEE) is an International Association of engineers in electronic technology and information science,