Method for shortening phase spacing protection overall actuation time
The invention discloses a method for shortening the phase spacing protection overall actuation time. The method comprises the steps that a phase spacing protection overall optimization model is established; according to a constraint condition, a constant value solution plane is divided into 2J(JK+4) constraint sections; binary coding processing is conducted on each constraint section and a binary string composed of all binary codes corresponding to phase spacing protection is obtained; fitness evaluation index calculation is conducted on each group of solutions of a target function according to a fitness formula so that fitness of each group of solutions can be obtained; the solutions are ranked according to the values of the fitness and a group of evaluated solutions are obtained; interlace operation and mutation operation are conducted on the group of evaluated solutions so that solutions of the next generation can be obtained; the group of solutions with the highest fitness value are determined to serve as an overall superior protection constant value. The method has the advantages that the calculation scale is small, the calculation efficiency is high, the solution accuracy is high, the optimal overall protection constant value can be obtained, the phase spacing time limit protection overall actuation time is shortened, and the overall performance of protection is improved. 1. Interphase distance protection for reducing the actuation time of the of the whole method, characterized in that comprises the following steps: (1) the whole construction of the optimization model interphase distance protection; wherein the phase-to-phase distance protection optimization model of the whole which comprises an optimization objective function and the constraint condition; (2) in order to delay section for horizontal movement value, and in order to delay section for the vertical axis the action time fixed value more than the plane constructed; according to the control conditions will the timing value more than the plane divided into 2J (J K+ 4) a restraint section; J time delay of a number of distance protection, distance protection K with a number of protection; (3) each restricting the interval of the binary coding processing, all the interphase distance protection is obtained corresponding to the binary code of the binary string, the binary string of the optimization problem that a set of solutions; (4) the random generating the optimization problem of a group of initial solution; (5) the formula to the degree of each of the object function adapting degrees group solution evaluation index calculation, to obtain the fitness of each group solution ; and according to the fitness of the size of the sorted group solution , high degree of adaptability for changing xie Ti lower than the threshold value of the fitness measure, to the highest or N0 to low the replacement solution the N0 solution , access to a group of air inlet to resolve; (6) the the group enters resolve cross-operation and mutation operation obtain the next generation solution; (7) repeat steps (5), (6), when the maximum of the adapted to maintain a certain value and without increasing the number of times of iteration, the number of times reaches a given value the or repeat , terminate optimization , determining a group of highest value to the solving of the of the whole protection fixed value. 2. Method according to Claim 1, characterized in that said optimization objective function is: 3. Method according to Claim 1 or 2, characterized in that the constraint conditions, including extremely bad constraint, trend constraint, constraint and sensitivity selective constraint; The restraint including the very Zi (j)/ Zi (j-1) ≥ Kjch (j), ti (j)-ti (j-1) ≥Δt, j= 2, 3, , J Zi (j) to interphase distance protection section i the action of j jahns period impedance, ti (j) section i for interphase distance protection action time delay period of time j, Zi (j-1) section i for interphase distance protection (j-1) the action of the delay period the impedance, ti (j-1) section i for interphase distance protection (j-1) operate time of the delay interval, Kjch (j) i for interphase distance protection section j time-delay section for the value of the difference, the interphase distance protection Δt i section j for the time delay period of time difference; The bound states the tidal current including Zi (j) ≤ Ziloadmax; Ziloadmax i the interphase distance protection for the circuit when the maximum load current flowing through the measured minimum load impedance; The sensitivity constraint including Zi (j) ≥ Klm (j) · Zimax (j); Zimax (j) section i for interphase distance protection delay j within the scope of protection of the maximum measured impedance; Klm (j) i for interphase distance protection section j for the sensitivity of the delay section; The selective restraint including Zb (j) ≤ Zxl +Kz Zm (j '), Zb (j) ≥ Zxl +Kz Zm (j' -1); tb (j) ≥ tm (j ') +Δt, j= 1, 2, , J, j' = 1, 2, J; Zb (j) backup protection section j to the action of the delay period the impedance, tb (j) backup protection section j of the operate time of the delay interval, Zm (j ') protection section j as' delay time of the movement impedance, tm (j') protection section j as' delay action time of interval of time, Zm (j '-1)-based protection section (j' -1) delay time of the movement impedance, Kz mainly helps and increases the coefficient of back-up protection; Δt for time difference. 4. Method according to Claim 2, characterized in that the adaptive degrees formula is