| 摘要 |
A harmonic-characteristics based current pattern matching method for the non-intrusive power load monitoring and disaggregation is provided in this present invention, on the basis of establishing the load signature database, which comprises electrical appliance registration and load state word space initialization, data acquisition and data preprocessing, feasible state word space search based on table looking-up, the optimal matching of current pattern, and display and output of the monitoring and disaggregation results. The method improves the accuracy of disaggregation, and can achieves exact identification of operating states of appliances, and also can reduce the cost. |
| 主权项 |
1. A harmonic-characteristics based current pattern matching method for the non-intrusive power load monitoring, wherein, establishing a load signature database which comprising the following load characteristic information:
(1) the power state and operating state of different appliances under the fundamental wave reference voltage Uref; (2) the steady-state current harmonic parameters of each operating state of different appliances; and comprising the following steps: Step of Electrical Appliance Registration and Initialization of Load State Word Space: 1) Determining the appliances inside the total load, and acquiring the load characteristic information of each appliance from the load signature database, and achieving the electrical appliance registration; 2) Statistical analyzing all the operating states of the total load, and storing the results in the orderly linear table of [state] in the form of state word to finish the initialization of load state word space ΩSW; Step of data acquisition and data preprocessing: This step includes sampling the load terminal voltage and steady-state total current, and denoising and harmonic analysis of the measured voltage and total current signal, thereby the following results are obtained: the measured total fundamental active power Pl1(t) is of:
Pl1(t)=U1I1 cos(θl1) (6) the measured total fundamental reactive power Ql1(t) is of:
Ql1(t)=U1I1 sin(θl1) (7) the measured unit total current pattern Il(Pl1(t),Ql1(t)) is of:
Il(Pl1(t),Ql1(t))=(1·∠θl1, . . . ,αlh·∠θlh, . . . ,αlH·∠lH)T (15) in equation (6) and (7), U1 represents the fundamental wave RMS-value of the measured load terminal voltage u(t), I1 represents the fundamental wave RMS-value of the measured load total current il(t); θl1 represents the initial phase angle of the fundamental wave of current il(t) relative to the fundamental phase angle of load terminal voltage; in equation (15), αlh represents per unit value of the h-th harmonic amplitude of current il(t) with its fundamental amplitude as base value, so αl1=1; θlh represents the initial phase angle of the h-th harmonic of current il(t) relative to the fundamental phase angle of load terminal voltage; Step of feasible state word space search based on table looking-up: By searching the orderly linear table [state], initial selection of the total load operating state are carried out in the load state word space ΩSW based on the measured fundamental active total power Pl1(t) and the measured fundamental reactive total power Ql1(t), and consequently the feasible state word space ΩSW(Pl1(t),Ql1(t))⊂ZN meeting the fundamental total power constraints is obtained; wherein, Z represents integer number space; Step of the optimal matching of current pattern: The objective function of the optimal matching of current pattern is as follows:min∀SWk∈Ωsw(Pl1(t),Ql1(t))Il(Pl1(t),Ql1(t))-I^l(SWk,U1)2(16) in equation (16), ∥•∥ represents the L2 norm; In the feasible state word space ΩSW (Pl1(t),Ql1(t))⊂ZN, a state word vector SWmin(t) bringing the objective function of the optimal matching of current pattern to obtain the minimum value is searched, which serves as the optimal estimation of the current operating state of the total load, then the accordingly appliance operating state is identified, and the Pmin1(t) which exclusively corresponds to the SWmin(t) serves as the optimal estimation of the current power state of the total load, so far the disaggregation of total fundamental active power is completed; Step of display and output of the monitoring and disaggregation results: Finally, displaying and outputting the power state and operating state of each appliance inside the load are performed. |
