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With the diversified development of electrical loads, and the large-scale integration of volatile renewable generations, power system operation, control and planning face the challenge of increasing injection uncertainties. In this paper, a new method for reference network considering nodal injection uncertainties is proposed. The actual operation mode optimization and reserve configuration of power...
Grid connection of distributed generation would have a certain impact on safe and stable operation of receiving-end network, so systematic analysis on it would be significant. The method for comprehensive assessment on effects caused by grid connection of distributed generation on power grid is presented. The assessment system is divided into steady-state operation assessment, reliability assessment,...
Parallelization is the main method to improve efficiency for solving sparse linear equations. This paper summarized the computing dependency relations of power system off/on line analysis application types. Almost all kinds of numerical methods related to power system computation can be attributed to solving Ax =b (A is sparse), and the direct method based on the Gaussian elimination is used widely,...
Based on the integration of power production management system, electricity information management system, supervisory control and data acquisition, the power grid planning platform support the power planning by big data technology. Load forecasting and analysis play an important role in power planning. By collecting real-time load data and putting history load data into database, power grid planners...
With the cross regional interconnection of the power grid, it is more and more inconsistent with the actual development of the power grid to use a single sandpile to simulate the power grid. The multi-sandpile model is developed to simulate the evolution process of the whole power grid failure in the form of all the single sandpiles evolving synchronously. First of all, the modeling method of multi-sandpile...
According to the application of cellular automata theory in complex system, a new kind of cellular automata model of grid failure is proposed which starts from basic concept of cellular automata and defines the composition method of cell, cellular rules and neighbors and so on. By simulation of the model, it is able to get the evolution of grid failure and it comprehensively considers of structural...
Different power grid operation mode corresponds with different short-circuit capacity distribution, while different distribution of short-circuit (current) capacity is contradictory to power grid operation performance and equipment tolerance influence consequence. This paper establishes functional relationship between short circuit (current) capacity of power grid and effective switch set and feasible...
Traditionally the evaluation and supervision of peak shaving operation of thermal power units depend on the simple variable of the minimum achievable load. This method didn't consider the rate of load change and the startup/shutdown time of units, and ignored the safety, emission and economy properties of the units. In addition, the peak shaving operation data of the units were acquired by means of...
The traditional power grid is confronted with great challenges brought by the integration of renewable power sources (such as solar and wind) for their uncertain, volatile, and intermittent characteristics. This paper investigates the unit commitment problem with stochastic solar power integration and makes the following major contributions. First, the scheduling problem is formulated as a two-stage...
With the rapid development of interconnections of regional power network, wind power and photovoltaic power etc. new energy connected to power grid, it poses a huge challenge to power grid control systems. The frequency stability and main ways of dealing with the instantaneous power gap in the power grid mainly depends on primary frequency compensation(PFC) based on thermal power units. By analyzing...
In this paper, considering the technical requirement of primary frequency compensation(PFC) for ultra high voltage(UHV) construction of Shandong power grid, the basic concept and research status of primary frequency compensation of thermal power unit are introduced. In order to meet the frequency compensation requirements of power grid after accessing UHV, the optimization scheme of primary frequency...
In order to solve a series of problems caused by photovoltaic (PV) off-grid, PV must have the low voltage ride through (LVRT) capability ensuring grid-connected operation and outputting reactive power to power grid within a certain time range. At present, the control strategies of PV grid-connected inverter under balance fault have been used effectively. However, the strategy of keeping the inverter...
The situation of automatic generation control(AGC) in ultra-high voltage(UHV) receiving-end grid has changed greatly, and it is necessary to develop on-line monitoring and remote diagnosis technology to solve new AGC control problems. Through the construction of generation-grid integrated data platform of Shandong power system, online running data of sixteen typical thermal power units are accessed...
In the inter-regional grid environment, the coordination of the relay setting and the grid run-time operating mode has an important significance to grid security, relay protection settings verification has also been a lot of attention. This paper studies relay protection setting on-line verification system based on distributed data exchange platform in the inter-regional grid environment, introduces...
A fault division method based on fault current limiting technology was proposed to solve the problem of simultaneous commutation failure (CF) in multi-infeed HVDC transmission system. The relationship formula between the reactance of fault current limiter (FCL) and the voltage drop of non-fault point were deduced. And it's proved that FCLs can compensate the voltage reduction of non-fault point to...
The large-scale un-coordinated charging electric vehicles(EV) will reduce the quality and reliability of power grid significantly. Centralized control can achieve the coordinated charging of EV. But cost of construction and maintenance of control system is increasing with the development of EVs. For the scattered distribution of EV, distributed control is more convenient to be realized. A coordinated...
According to construction scheme to intelligentize the substation primary equipment, a new evaluation method to intelligent transformation of substation primary equipment was presented in this paper. The improvement status of primary equipment in different voltage level substations was widely investigated in East China and Central China. According to the status, a multi-objective optimization evaluation...
The introduction of the new situation of power industry reform program marks the formal launch of China's new round of power system reform. This paper focuses on the new electricity reform program, studies the impact of the new electricity reform on the grid investment, and discusses the investment principle and investment strategy of the new power reform. It is considered that the introduction of...
Recent years, the issue of cyber security has become ever more prevalent in the analysis and design of electrical cyber-physical systems (ECPSs). In this paper, we present the TrueTime Network Library for modeling the framework of ECPSs and focuses on the vulnerability analysis of ECPSs under DoS attacks. Model predictive control algorithm is used to control the ECPS under disturbance or attacks....
For the harmonic resonance problem of the photovoltaic multi-inverter parallel grid-connected system, this paper mainly analyzes the resonant characteristics of the LCL interface circuit. The model of the LCL interface circuit is given, and with the increase of grid-connected inverter number, the resonant characteristics are analyzed respectively which the circuit system is stimulated by the harmonic...
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