To address issues such as poor response to concentrated demand from flexible loads during low-price periods, a flexible load limit algorithm is adopted to achieve hybrid control of flexible loads. A control method using nonlinear price parameters to adjust the higher-order terms of the load demand curve is proposed. By penalizing load flexibility, the smoothness of the load demand curve is improved, suppressing peak demand for electric heating during low-price periods and reducing control deviations in load response. A load response control experiment was conducted on electric heating for 1 032 households in a community in Northeast China to verify the effectiveness of the method. The research results show that the flexible load control method can effectively suppress peak load demand during low-price periods. Compared with traditional methods using hard and linear parameters for load control, the flexible load control method can improve the smoothness of the load demand curve by 56.3 percentage points and reduce the control deviation in load response by 16.8 percentage points. The elastic load limit interval widens as load demand increases, and during price demarcation periods, it narrows sharply to ensure the speed of load response. The research findings provide a reference for improving the stability of power supply.
CHENGang, NAGuangyu, WANGChenqi,et al.Two-stage virtual power plant trading strategy considering comprehensive demand response and energy storage[J].Journal of Liaoning Technical University (Natural Science),2021,40(1):64-71.
LIXianglong, ZHAOLe, WANGHanqiu,et al.Power grid peak and valley adjustment algorithm based on flexible load and building multi-energy system[J].Journal of Shenyang University of Technology, 2023,45(4):361-365.
JIANGTingyu, LIYaping, JUPing,et al.Overview of modeling method for flexible load and its control[J].Smart Power,2020,48(10):1-8.
[7]
ULLAHK, ULLAHZ, ASLAMS,et al.Wind farms and flexible loads contribution in automatic generation control:an extensive review and simulation[J].Energies,2023,16(14):5498.
[8]
PAPADASKALOPOULOSD, STRBACG.Nonlinear and randomized pricing for distributed management of flexible loads[J].IEEE Transactions on Smart Grid,2016,7(2):1137-1146.
[9]
ÇIMENH, BAZMOHAMMADIN, LASHABA,et al.An online energy management system for AC/DC residential microgrids supported by non-intrusive load monitoring[J].Applied Energy,2022,307:118136.
[10]
SUOL, LIUG C.Research on source-load coordinated dispatching of flexible DC distribution network based on big data[J].Journal of High Speed Networks,2022,28:231-241.
LYUZ L, LAIY F, YANGX,et al.Cooperative game consistency optimal strategy of multi-microgrid system considering flexible load[J].Energy Sources,Part A:Recovery,Utilization,and Environmental Effects,2022,44(3):7378-7399.
[13]
JANGIDB, MATHURIAP, GUPTAV.A flexible load aggregation framework for optimal distribution system operation[J].Sustainable Energy, Grids and Networks,2023,35:101117.
XUZhi, CHENJun, ZHANGZhiyong,et al.Network security assessment based on hidden Markov and artificial immunization in new power systems[J].Journal of East China Normal University (Natural Science),2023(5):182-192.
DONGWenna, WANGZengping, ZHAOQiao,et al.Fault state similarity analysis method for distribution network based on artificial immune clustering algorithm[J].Proceedings of the CSU-EPSA,2021,33(6):60-66.
[18]
DUDEKG.Artificial immune system with local feature selection for short-term load forecasting[J].IEEE Transactions on Evolutionary Computation,2017,21(1):116-130.
LIGuoqing, LIUZhao, JINGuobin,et al.Ultra short-term power load forecasting based on randomly distributive embedded framework and BP neural network[J].Power System Technology,2020,44(2):437-445.
[23]
YANY B, SHAOY, WANGD,et al.Prediction of the whole society electricity consumption in northeast China based on the BP neural network and Markov[J].Frontiers in Energy Research,2024,12: 1326525.
[24]
ZHANW F, ZHANGL P, FENGX J,et al.An equivalent processing method for integrated circuit electrical parameter data using BP neural networks[J].Microelectronics Journal,2023,139:105912.
[25]
SHING S, KIMH Y, MAHSEREDJIANJ,et al.Smart vehicle-to-grid operation of power system based on EV user behavior[J].Journal of Electrical Engineering & Technology,2024,19(5):2941-2952.
[26]
LIUK, SUNS B, WUG H,et al.Power data sampling model based on multi-layer sensing and prediction[J].International Journal of Emerging Electric Power Systems,2023,24(6):807-815.
[27]
DATEJ, CANDANEDOJ A, ATHIENITISA K,et al.Development of reduced order thermal dynamic models for building load flexibility of an electrically-heated high temperature thermal storage device[J]. Science and Technology for the Built Environment, 2020,26(7):956-974.
WUZhiqiang, GAOYan, WANGBo.Real-time pricing strategy for the smart grid under“load-utility”two-level balance[J].Power System Protection and Control,2021,49(17):65-73.