39results about How to "Reduce load shedding" patented technology

The invention discloses a coordinated control method for improving the frequency stability of the power grid after DC blocking. The cooperative control master station receives the DC blocking information sent by the DC control execution station, and obtains the control amount and the effective control object set from the matching of the control strategy table; The control master station identifies the current effective control quantities of DC, energy storage, and load controllable objects, forms real-time control measures, and sends them to the DC control execution station, energy storage control execution station, and load control execution station to coordinate and complete emergency control. The invention provides a coordinated control method for improving the frequency stability of the power grid after DC blocking, which can be used to solve the priority order problem of various control objects after the DC blocking of the receiving power grid, and is beneficial to make full use of the available DC, energy storage, and load systems. control characteristics, improve the frequency stability of the system, avoid reducing load shedding, and improve the economy and safety of power system operation.

The invention relates to a power system intelligent low-frequency low-voltage load reduction method based on an intelligent household electrical appliance. The method comprises the following steps: when large disturbance in a system is monitored, determining whether the frequency and the voltages of the system are decreased to preset load reduction motion values, and once the frequency and the voltages reach the load reduction motion values, obtaining power shortage in the system and determining a load capacity which should be cut from the system; starting an intelligent household electrical appliance load reduction module; starting low-frequency low-voltage load reduction; and if intelligent household electrical appliance load reduction cannot enable the system frequency and voltages to restore to normal operation scopes and the frequency and voltages are continuously decreased to preset values of the low-frequency low-voltage load reduction, starting the low-frequency low-voltage load reduction, according to a residual load reduction amount, successively starting a basic round and a special round of low-frequency load reduction for cutting off loads until the frequency is restored to the normal operation scope, and embedding one low-voltage load reduction module in each round of low-frequency load cutting. According to the invention, after a power system is disturbed, the frequency and voltages can be effectively and rapidly inhibited from dropping and even collapsing, the load cutting amount is small, and the economic loss is small.

The present invention relates to the field of power grid dispatching control, in particular to a regional power grid optimal load control method considering regional balance, which is characterized in that it includes the following steps: A) obtaining the total amount of load control; B) calculating the target amount of load removal in each area; C) Select the line to be pulled from the pull-limit sequence table; D) Construct the full load shedding model and the short load shedding model; E) Build the regional load balance model; F) Calculate the full load cut off and short load in each area Cut-off and regional load balance value; G) Output the cut-off lines in each region; the region refers to the county-level power supply units and district-level power supply units within the jurisdiction of the regional power grid. The beneficial effects of the present invention are: on the basis of satisfying the shedding load, the total shedding load can be reduced, excessive shedding can be avoided, economy and regional fairness can be effectively taken into account, the load shedding can be reduced to the greatest extent, and the power grid can be fully guaranteed Scheduling fairness.

An Automatic load-reducing control method for integrating the voltage frequency dynamic mutual influence measures the state quantity information on site such as voltage, frequency and power so as to determine whether to act for implementing the load-reducing. The invention effectively takes account of the coupling degree of the voltage amount and the frequency amount under the corresponding operating condition by calculating the average frequency voltage correlation coefficient at the device installation nodes under a certain operating condition; calculating the synthetic state quantity in real time by measuring the voltage, frequency and active power of the installation node of each automatic load-reducing control device in real time and starting the automatic load-reducing control devicein time based on the change circumstance, and acting in turn. The invention introduces the active power measurement into the traditional automatic load-reducing device, takes account of the interaction of the voltage and the frequency generated by the load active power and solves the problem that the device may not act or act excessively only based on the change of the frequency amount or the voltage amount.

Provided is a power distribution network single-phase earth fault network reconstruction method. The power distribution network single-phase earth fault network reconstruction method comprises the following steps: after earth fault, all power restoration zones are divided into two groups, branch circuits locating in the same section bus with fault circuits are divided into a group A, and power restoration circuits locating in different section buses are divided into a group B; for all power restoration circuits of the two groups, on the premise of voltage meeting constraint conditions, a power restoration circuit with a smallest network loss value in the group A is preferentially selected to avoid power failure in the power restoration process, a hot switch operation is conducted at the moment, namely, bus interconnection switches are closed, and then circuit breakers in failure positions are tripped off. For power restoration circuits of the group B, a cold switch operation is conducted, namely, the circuit breakers in the failure positions are tripped off, and then the bus interconnection switches are closed. The power distribution network single-phase earth fault network reconstruction method preferentially selects the hot switch operation which fully uses characteristics of single-phase earth faults, so that a power distribution network can operate in a normal condition or with faults. Besides, the power distribution network single-phase earth fault network reconstruction method ensures power supply quality of users, improves reliability of power supply, and has high operability and superiority. The power distribution network single-phase earth fault network reconstruction method is mature in technology and high in reliability.