The invention provides a transmission and distribution coordinated distribution type reactive voltage optimizing method, and belongs to the technical field of electrical power system operation and control. The method comprises the following steps: constructing a transmission and distribution combined reactive optimal model formed by a target function and a constraint condition by comprehensively taking the coupling relationship among a transmission network model, a distribution network model and transmission-and-distribution into consideration; then, performing second-order cone relaxation on a non-convex constraint of a distribution network, and converting the non-convex constraint into convex constraint; solving the model by applying an improved generalized Benders decomposition method. The method only needs to interact a small amount of information between the transmission network and the distribution network, has an excellent convergence speed, ensures the scheduling and controlling independence of transmission and distribution, can be used for solving the problems of overvoltage, power dismatching and the like caused by a traditional transmission and distribution independent reactive optimizing method, and can achieve optimal loss of the whole local network.

Transmission and distribution coordinated distribution type reactive voltage optimizing method

The invention relates to a wind power plant AVC reactive power control system and method for reducing power loss of a wind power plant and belongs to the technical field of wind power plant grid-connected operation control. The wind power plant AVC reactive power control system comprises a wind power plant AVC substation, a wind driven generator and a reactive compensation device SVC, wherein the wind power plant AVC substation is connected with a wind driven generator server, the wind power plant AGC, the reactive compensation device SVC and a scheduling master station. The wind power plant AVC reactive power control system and method for reducing the power loss of the wind power plant have the advantages that generating efficiency of the system is improved, the fact that reactive power emitted or absorbed by each unit is within the permissible range of the unit is guaranteed, safe operation of equipment is guaranteed, the relation between active power output and reactive power output of a draught fan is fully considered, the reactive power output capacity of the draught fan is performed to the maximum degree, the switching frequency of a centralized reactive compensation device is reduced, and the using efficiency is improved.

Wind power plant AVC reactive power control system and method for reducing power loss of wind power plant

The invention discloses a mold splitting type voltage control method for a wind power plant cluster, and belongs to the technical field of automatic voltage control of electrical power systems. According to the technical scheme, two control modes of a wind power plant are defined according to the voltage of a grid joint point and current reactive power regulation capacity of the wind power plant, and a wind power plant cluster control center under different control modes sends different control instructions to each wind power plant. The method carries out coordination control on other wind power plants in a cluster according to real-time sensitivity relations among the wind power plants of the wind power plant cluster when a certain wind power plant is insufficient in reactive power regulation capacity. The mold splitting type voltage control method for the wind power plant cluster can be integrated in a control system of the wind power plant cluster control center, and supplies supporting for voltage control of a regional power grid of the wind power plant cluster.

Mold splitting type voltage control method for wind power plant cluster

The invention relates to a combined static safety analysis method for an electrical-gas coupling multiple energy flow system, belongs to the technical field of operation and control in multiple energy source modes The method breaks through limit of safety analysis of an electrical power system only taking consideration of the electrical power system itself, the method takes consideration of mutual influence of electrical power supply and gas supply and realizes combined static safety analysis on the electrical-gas coupling multiple energy flow system, so influence of possible preconceived accidents in electrical power supply and gas supply on the two systems are all analyzed, compared with a method carrying out independent safety analysis on electrical power supply and on gas supply, safety analysis precision is improved, and error and determination missing are reduced The method can be applied to online operation of the electrical-gas coupling multiple energy flow system and works for electrical-gas coupling multiple energy flow energy management, a safety warning is provided when the system has a safety problem or a latent risk, and improvement of operation safety of the electrical-gas coupling multiple energy flow system is facilitated

Combined static safety analysis method for electrical-gas coupling multiple energy flow system

The invention relates to an adjusting method based on comprehensive considering of voltage and reactive power for an SVG (Static Var generator) of a wind power plant, belonging to the technical field of automatic voltage and reactive power adjusting of a wind power plant. The method comprises the following steps: correcting target voltage values into an upper limit value and a lower limit value according to emergency upper and lower limits of voltage, a qualified bandwidth of voltage and a voltage adjusting dead zone; determining whether to carry out "constant-voltage" adjusting or "constant reactive power" adjusting according to the condition whether the current voltage is beyond the range of the lower limit value to the upper limit value or not; when carrying out "constant-voltage" adjusting, determining the reactive power adjusting variable according to the out-of-limit amount; when carrying out "constant-voltage" adjusting, determining the reactive power adjusting variable according to a target reactive power value; and verifying the reactive power adjusting variable according to the upper and lower limits of voltage and a reactive power adjusting step length. According to the adjusting method, the voltage of a point of common coupling is given a priority to be controlled between the upper and lower limits required as dispatching; therefore, the voltage qualified rate of the wind power plant is improved, the accurate adjustment of reactive power output can be realized under the condition of qualified voltage, and the operation safety and reliability of the wind power plant can be improved.

Adjusting method based on comprehensive considering of voltage and reactive power for SVG (Static Var generator) of wind power plant

The invention relates to a power system real time nodal data three-dimensional visualization method which is based on the fast spatial interpolation, and belongs to the power system three-dimensionalvisualization techniology field. The method comprises the following steps that: the scale of rectangular grids is determined and drawn; the nodal data in a power network are collected; the parametersof the spatial interpolation algorithm are set; the calculation is carried out through the fast spatial interpolation algorithm; for each grid point (xi, yj), the interpolation result (vi, j) is calculated, the power network wiring diagram is taken as the background, and the two-dimensional scalar field visualization technology is used to express grid data (xi, yj, vi, j), so as to obtain the visual graphic of the real time nodal data, which is used to carry out the real time safety economy monitoring to the power network; while ensuring the rapidity, the invention remarkably improves the visual effect and the practicability of the three-dimensional visual graphic through introducing a dummy average point and modifying the weight coefficient.

Three-dimensional visualization method for power system real time node data based on rapid space interpolation

Method for enhancing voltage safety margin of wind farm

The invention relates to a power generation margin distribution method for a photovoltaic power station based on power grid security constraints and belongs to the field of running and control technologies of new energy electric power systems. The power generation margin distribution method for the photovoltaic power station based on power grid security constraints includes that according to a fair scheduling principle, after the photovoltaic power station enters a free power generation state, the space of a power grid for performing photovoltaic power generation is uniformly distributed for each photovoltaic power station according to a minimum load rate deviation method, on the one hand, unnecessary photovoltaic power discarding due to a too small active set value of the photovoltaic power generation is avoided, and on the other hand, the problem that the power output by the photovoltaic power generation surpasses the power grid bearing capacity due to a too large active set value due to distributing the photovoltaic power generation capacity is avoided. The power generation margin distribution method for the photovoltaic power station based on power grid security constraints is integrated in a photovoltaic power generation active control master station run by a dispatching center to enable the system to implement an optimal control strategy in real time according to the photovoltaic power generation running state and the power grid running state, maintain enough backspin security space for the power grid, guarantee the active power security of the section of a connecting wire of the photovoltaic power station and the power grid and guarantee the fair scheduling among the photovoltaic power stations.

Power generation margin distribution method for photovoltaic power station based on power grid security constraints

Wind farm voltage control method based on voltage operating state

The invention relates to a calculation method for maximum output of wind-solar hybrid power generation in a multi-source generation combined operation mode and belongs to the technical field of operation and controlling of new energy sources connected to power systems. According to the method, maximum output of wind-solar power generation in the multi-source generation combined operation mode is calculated according to active power of a wind-solar power outgoing line, upper limit allowance of the active power, and downward adjustable allowance of active power of automatic generating sets in a wind-solar power combination area. Acceptance space of a power grid is mined on the premise of ensuring safety of the power grid, and wind-solar power utilization rate is increased as high as possible. The method has the advantages that the method can be integrated to a multi-source generation combined operation scheduling master system, using wind, solar, water and gas power generation, operating in a scheduling center, the system can implement the most appropriate control strategy according to current operating states of wind farms/photovoltaic power stations and safety allowances of wind/solar outgoing passages in real time, and different needs for safe, high-quality and economical control of the power grid are met accordingly.

Calculation method for maximum output of wind-solar hybrid power generation in multi-source generation combined operation mode

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